Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 48416:c1b633db67fc
rust: Serializing a DirstateMap does not mutate it anymore
Differential Revision: https://phab.mercurial-scm.org/D11834
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 29 Nov 2021 17:37:08 +0100 |
parents | 434de12918fd |
children | 2097f63575a5 |
rev | line source |
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1 use bytes_cast::BytesCast; |
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2 use micro_timer::timed; |
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3 use std::borrow::Cow; |
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4 use std::path::PathBuf; |
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5 |
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6 use super::on_disk; |
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7 use super::on_disk::DirstateV2ParseError; |
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8 use super::owning::OwningDirstateMap; |
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9 use super::path_with_basename::WithBasename; |
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10 use crate::dirstate::parsers::pack_entry; |
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11 use crate::dirstate::parsers::packed_entry_size; |
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12 use crate::dirstate::parsers::parse_dirstate_entries; |
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13 use crate::dirstate::CopyMapIter; |
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14 use crate::dirstate::StateMapIter; |
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15 use crate::dirstate::TruncatedTimestamp; |
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16 use crate::dirstate::SIZE_FROM_OTHER_PARENT; |
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17 use crate::dirstate::SIZE_NON_NORMAL; |
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18 use crate::matchers::Matcher; |
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19 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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20 use crate::DirstateEntry; |
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21 use crate::DirstateError; |
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22 use crate::DirstateParents; |
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23 use crate::DirstateStatus; |
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24 use crate::EntryState; |
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25 use crate::FastHashMap; |
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26 use crate::PatternFileWarning; |
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27 use crate::StatusError; |
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28 use crate::StatusOptions; |
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29 |
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30 /// Append to an existing data file if the amount of unreachable data (not used |
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31 /// anymore) is less than this fraction of the total amount of existing data. |
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32 const ACCEPTABLE_UNREACHABLE_BYTES_RATIO: f32 = 0.5; |
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33 |
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34 pub struct DirstateMap<'on_disk> { |
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35 /// Contents of the `.hg/dirstate` file |
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36 pub(super) on_disk: &'on_disk [u8], |
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37 |
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38 pub(super) root: ChildNodes<'on_disk>, |
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39 |
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40 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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41 pub(super) nodes_with_entry_count: u32, |
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42 |
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43 /// Number of nodes anywhere in the tree that have |
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44 /// `.copy_source.is_some()`. |
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45 pub(super) nodes_with_copy_source_count: u32, |
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46 |
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47 /// See on_disk::Header |
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48 pub(super) ignore_patterns_hash: on_disk::IgnorePatternsHash, |
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49 |
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50 /// How many bytes of `on_disk` are not used anymore |
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51 pub(super) unreachable_bytes: u32, |
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52 } |
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53 |
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54 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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55 /// map key would also work: all paths in a given map have the same parent |
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56 /// path, so comparing full paths gives the same result as comparing base |
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57 /// names. However `HashMap` would waste time always re-hashing the same |
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58 /// string prefix. |
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59 pub(super) type NodeKey<'on_disk> = WithBasename<Cow<'on_disk, HgPath>>; |
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60 |
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61 /// Similar to `&'tree Cow<'on_disk, HgPath>`, but can also be returned |
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62 /// for on-disk nodes that don’t actually have a `Cow` to borrow. |
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63 pub(super) enum BorrowedPath<'tree, 'on_disk> { |
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64 InMemory(&'tree HgPathBuf), |
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65 OnDisk(&'on_disk HgPath), |
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66 } |
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67 |
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68 pub(super) enum ChildNodes<'on_disk> { |
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69 InMemory(FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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70 OnDisk(&'on_disk [on_disk::Node]), |
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71 } |
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72 |
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73 pub(super) enum ChildNodesRef<'tree, 'on_disk> { |
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74 InMemory(&'tree FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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75 OnDisk(&'on_disk [on_disk::Node]), |
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76 } |
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77 |
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78 pub(super) enum NodeRef<'tree, 'on_disk> { |
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79 InMemory(&'tree NodeKey<'on_disk>, &'tree Node<'on_disk>), |
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80 OnDisk(&'on_disk on_disk::Node), |
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81 } |
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82 |
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83 impl<'tree, 'on_disk> BorrowedPath<'tree, 'on_disk> { |
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84 pub fn detach_from_tree(&self) -> Cow<'on_disk, HgPath> { |
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85 match *self { |
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86 BorrowedPath::InMemory(in_memory) => Cow::Owned(in_memory.clone()), |
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87 BorrowedPath::OnDisk(on_disk) => Cow::Borrowed(on_disk), |
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88 } |
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89 } |
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90 } |
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91 |
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92 impl<'tree, 'on_disk> std::ops::Deref for BorrowedPath<'tree, 'on_disk> { |
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93 type Target = HgPath; |
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94 |
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95 fn deref(&self) -> &HgPath { |
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96 match *self { |
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97 BorrowedPath::InMemory(in_memory) => in_memory, |
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98 BorrowedPath::OnDisk(on_disk) => on_disk, |
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99 } |
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100 } |
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101 } |
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102 |
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103 impl Default for ChildNodes<'_> { |
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104 fn default() -> Self { |
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105 ChildNodes::InMemory(Default::default()) |
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106 } |
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107 } |
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108 |
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109 impl<'on_disk> ChildNodes<'on_disk> { |
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110 pub(super) fn as_ref<'tree>( |
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111 &'tree self, |
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112 ) -> ChildNodesRef<'tree, 'on_disk> { |
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113 match self { |
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114 ChildNodes::InMemory(nodes) => ChildNodesRef::InMemory(nodes), |
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115 ChildNodes::OnDisk(nodes) => ChildNodesRef::OnDisk(nodes), |
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116 } |
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117 } |
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118 |
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119 pub(super) fn is_empty(&self) -> bool { |
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120 match self { |
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121 ChildNodes::InMemory(nodes) => nodes.is_empty(), |
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122 ChildNodes::OnDisk(nodes) => nodes.is_empty(), |
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123 } |
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124 } |
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125 |
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126 fn make_mut( |
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127 &mut self, |
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128 on_disk: &'on_disk [u8], |
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129 unreachable_bytes: &mut u32, |
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130 ) -> Result< |
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131 &mut FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>, |
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132 DirstateV2ParseError, |
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133 > { |
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134 match self { |
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135 ChildNodes::InMemory(nodes) => Ok(nodes), |
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136 ChildNodes::OnDisk(nodes) => { |
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137 *unreachable_bytes += |
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138 std::mem::size_of_val::<[on_disk::Node]>(nodes) as u32; |
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139 let nodes = nodes |
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140 .iter() |
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141 .map(|node| { |
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142 Ok(( |
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143 node.path(on_disk)?, |
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144 node.to_in_memory_node(on_disk)?, |
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145 )) |
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146 }) |
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147 .collect::<Result<_, _>>()?; |
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148 *self = ChildNodes::InMemory(nodes); |
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149 match self { |
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150 ChildNodes::InMemory(nodes) => Ok(nodes), |
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151 ChildNodes::OnDisk(_) => unreachable!(), |
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152 } |
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153 } |
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154 } |
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155 } |
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156 } |
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157 |
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158 impl<'tree, 'on_disk> ChildNodesRef<'tree, 'on_disk> { |
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159 pub(super) fn get( |
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160 &self, |
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161 base_name: &HgPath, |
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162 on_disk: &'on_disk [u8], |
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163 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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164 match self { |
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165 ChildNodesRef::InMemory(nodes) => Ok(nodes |
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166 .get_key_value(base_name) |
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167 .map(|(k, v)| NodeRef::InMemory(k, v))), |
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168 ChildNodesRef::OnDisk(nodes) => { |
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169 let mut parse_result = Ok(()); |
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170 let search_result = nodes.binary_search_by(|node| { |
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171 match node.base_name(on_disk) { |
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172 Ok(node_base_name) => node_base_name.cmp(base_name), |
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173 Err(e) => { |
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174 parse_result = Err(e); |
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175 // Dummy comparison result, `search_result` won’t |
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176 // be used since `parse_result` is an error |
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177 std::cmp::Ordering::Equal |
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178 } |
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179 } |
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180 }); |
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181 parse_result.map(|()| { |
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182 search_result.ok().map(|i| NodeRef::OnDisk(&nodes[i])) |
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183 }) |
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184 } |
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185 } |
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186 } |
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187 |
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188 /// Iterate in undefined order |
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189 pub(super) fn iter( |
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190 &self, |
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191 ) -> impl Iterator<Item = NodeRef<'tree, 'on_disk>> { |
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192 match self { |
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193 ChildNodesRef::InMemory(nodes) => itertools::Either::Left( |
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194 nodes.iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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195 ), |
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196 ChildNodesRef::OnDisk(nodes) => { |
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197 itertools::Either::Right(nodes.iter().map(NodeRef::OnDisk)) |
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198 } |
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199 } |
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200 } |
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201 |
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202 /// Iterate in parallel in undefined order |
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203 pub(super) fn par_iter( |
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204 &self, |
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205 ) -> impl rayon::iter::ParallelIterator<Item = NodeRef<'tree, 'on_disk>> |
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206 { |
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207 use rayon::prelude::*; |
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208 match self { |
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209 ChildNodesRef::InMemory(nodes) => rayon::iter::Either::Left( |
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210 nodes.par_iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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211 ), |
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212 ChildNodesRef::OnDisk(nodes) => rayon::iter::Either::Right( |
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213 nodes.par_iter().map(NodeRef::OnDisk), |
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214 ), |
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215 } |
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216 } |
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217 |
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218 pub(super) fn sorted(&self) -> Vec<NodeRef<'tree, 'on_disk>> { |
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219 match self { |
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220 ChildNodesRef::InMemory(nodes) => { |
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221 let mut vec: Vec<_> = nodes |
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222 .iter() |
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223 .map(|(k, v)| NodeRef::InMemory(k, v)) |
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224 .collect(); |
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225 fn sort_key<'a>(node: &'a NodeRef) -> &'a HgPath { |
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226 match node { |
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227 NodeRef::InMemory(path, _node) => path.base_name(), |
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228 NodeRef::OnDisk(_) => unreachable!(), |
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229 } |
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230 } |
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231 // `sort_unstable_by_key` doesn’t allow keys borrowing from the |
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232 // value: https://github.com/rust-lang/rust/issues/34162 |
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233 vec.sort_unstable_by(|a, b| sort_key(a).cmp(sort_key(b))); |
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234 vec |
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235 } |
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236 ChildNodesRef::OnDisk(nodes) => { |
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237 // Nodes on disk are already sorted |
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238 nodes.iter().map(NodeRef::OnDisk).collect() |
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239 } |
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240 } |
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241 } |
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242 } |
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243 |
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244 impl<'tree, 'on_disk> NodeRef<'tree, 'on_disk> { |
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245 pub(super) fn full_path( |
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246 &self, |
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247 on_disk: &'on_disk [u8], |
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248 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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249 match self { |
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250 NodeRef::InMemory(path, _node) => Ok(path.full_path()), |
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251 NodeRef::OnDisk(node) => node.full_path(on_disk), |
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252 } |
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253 } |
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254 |
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255 /// Returns a `BorrowedPath`, which can be turned into a `Cow<'on_disk, |
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256 /// HgPath>` detached from `'tree` |
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257 pub(super) fn full_path_borrowed( |
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258 &self, |
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259 on_disk: &'on_disk [u8], |
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260 ) -> Result<BorrowedPath<'tree, 'on_disk>, DirstateV2ParseError> { |
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261 match self { |
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262 NodeRef::InMemory(path, _node) => match path.full_path() { |
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263 Cow::Borrowed(on_disk) => Ok(BorrowedPath::OnDisk(on_disk)), |
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264 Cow::Owned(in_memory) => Ok(BorrowedPath::InMemory(in_memory)), |
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265 }, |
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266 NodeRef::OnDisk(node) => { |
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267 Ok(BorrowedPath::OnDisk(node.full_path(on_disk)?)) |
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268 } |
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269 } |
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270 } |
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271 |
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272 pub(super) fn base_name( |
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273 &self, |
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274 on_disk: &'on_disk [u8], |
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275 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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276 match self { |
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277 NodeRef::InMemory(path, _node) => Ok(path.base_name()), |
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278 NodeRef::OnDisk(node) => node.base_name(on_disk), |
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279 } |
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280 } |
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281 |
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282 pub(super) fn children( |
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283 &self, |
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284 on_disk: &'on_disk [u8], |
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285 ) -> Result<ChildNodesRef<'tree, 'on_disk>, DirstateV2ParseError> { |
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286 match self { |
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287 NodeRef::InMemory(_path, node) => Ok(node.children.as_ref()), |
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288 NodeRef::OnDisk(node) => { |
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289 Ok(ChildNodesRef::OnDisk(node.children(on_disk)?)) |
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290 } |
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291 } |
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292 } |
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293 |
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294 pub(super) fn has_copy_source(&self) -> bool { |
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295 match self { |
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296 NodeRef::InMemory(_path, node) => node.copy_source.is_some(), |
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297 NodeRef::OnDisk(node) => node.has_copy_source(), |
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298 } |
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299 } |
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300 |
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301 pub(super) fn copy_source( |
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302 &self, |
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303 on_disk: &'on_disk [u8], |
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304 ) -> Result<Option<&'tree HgPath>, DirstateV2ParseError> { |
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305 match self { |
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306 NodeRef::InMemory(_path, node) => { |
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307 Ok(node.copy_source.as_ref().map(|s| &**s)) |
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308 } |
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309 NodeRef::OnDisk(node) => node.copy_source(on_disk), |
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310 } |
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311 } |
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312 |
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313 pub(super) fn entry( |
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314 &self, |
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315 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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316 match self { |
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317 NodeRef::InMemory(_path, node) => { |
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318 Ok(node.data.as_entry().copied()) |
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319 } |
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320 NodeRef::OnDisk(node) => node.entry(), |
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321 } |
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322 } |
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323 |
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324 pub(super) fn state( |
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325 &self, |
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326 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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327 Ok(self.entry()?.map(|e| e.state())) |
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328 } |
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329 |
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330 pub(super) fn cached_directory_mtime( |
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331 &self, |
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332 ) -> Result<Option<TruncatedTimestamp>, DirstateV2ParseError> { |
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333 match self { |
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334 NodeRef::InMemory(_path, node) => Ok(match node.data { |
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335 NodeData::CachedDirectory { mtime } => Some(mtime), |
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336 _ => None, |
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337 }), |
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338 NodeRef::OnDisk(node) => node.cached_directory_mtime(), |
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339 } |
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340 } |
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341 |
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342 pub(super) fn descendants_with_entry_count(&self) -> u32 { |
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343 match self { |
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344 NodeRef::InMemory(_path, node) => { |
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345 node.descendants_with_entry_count |
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346 } |
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347 NodeRef::OnDisk(node) => node.descendants_with_entry_count.get(), |
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348 } |
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349 } |
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350 |
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351 pub(super) fn tracked_descendants_count(&self) -> u32 { |
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352 match self { |
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353 NodeRef::InMemory(_path, node) => node.tracked_descendants_count, |
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354 NodeRef::OnDisk(node) => node.tracked_descendants_count.get(), |
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355 } |
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356 } |
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357 } |
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358 |
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359 /// Represents a file or a directory |
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360 #[derive(Default)] |
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361 pub(super) struct Node<'on_disk> { |
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362 pub(super) data: NodeData, |
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363 |
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364 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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365 |
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366 pub(super) children: ChildNodes<'on_disk>, |
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367 |
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368 /// How many (non-inclusive) descendants of this node have an entry. |
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369 pub(super) descendants_with_entry_count: u32, |
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370 |
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371 /// How many (non-inclusive) descendants of this node have an entry whose |
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372 /// state is "tracked". |
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373 pub(super) tracked_descendants_count: u32, |
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374 } |
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375 |
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376 pub(super) enum NodeData { |
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377 Entry(DirstateEntry), |
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378 CachedDirectory { mtime: TruncatedTimestamp }, |
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379 None, |
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380 } |
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381 |
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382 impl Default for NodeData { |
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383 fn default() -> Self { |
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384 NodeData::None |
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385 } |
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386 } |
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387 |
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388 impl NodeData { |
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389 fn has_entry(&self) -> bool { |
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390 match self { |
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391 NodeData::Entry(_) => true, |
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392 _ => false, |
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393 } |
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394 } |
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395 |
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396 fn as_entry(&self) -> Option<&DirstateEntry> { |
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397 match self { |
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398 NodeData::Entry(entry) => Some(entry), |
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399 _ => None, |
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400 } |
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401 } |
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402 } |
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403 |
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404 impl<'on_disk> DirstateMap<'on_disk> { |
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405 pub(super) fn empty(on_disk: &'on_disk [u8]) -> Self { |
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406 Self { |
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407 on_disk, |
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408 root: ChildNodes::default(), |
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409 nodes_with_entry_count: 0, |
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410 nodes_with_copy_source_count: 0, |
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411 ignore_patterns_hash: [0; on_disk::IGNORE_PATTERNS_HASH_LEN], |
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412 unreachable_bytes: 0, |
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413 } |
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414 } |
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415 |
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416 #[timed] |
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417 pub fn new_v2( |
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418 on_disk: &'on_disk [u8], |
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419 data_size: usize, |
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420 metadata: &[u8], |
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421 ) -> Result<Self, DirstateError> { |
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422 if let Some(data) = on_disk.get(..data_size) { |
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423 Ok(on_disk::read(data, metadata)?) |
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424 } else { |
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425 Err(DirstateV2ParseError.into()) |
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426 } |
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427 } |
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428 |
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429 #[timed] |
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430 pub fn new_v1( |
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431 on_disk: &'on_disk [u8], |
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432 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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433 let mut map = Self::empty(on_disk); |
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434 if map.on_disk.is_empty() { |
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435 return Ok((map, None)); |
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436 } |
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437 |
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438 let parents = parse_dirstate_entries( |
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439 map.on_disk, |
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440 |path, entry, copy_source| { |
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441 let tracked = entry.state().is_tracked(); |
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442 let node = Self::get_or_insert_node( |
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443 map.on_disk, |
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444 &mut map.unreachable_bytes, |
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445 &mut map.root, |
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446 path, |
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447 WithBasename::to_cow_borrowed, |
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448 |ancestor| { |
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449 if tracked { |
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450 ancestor.tracked_descendants_count += 1 |
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451 } |
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452 ancestor.descendants_with_entry_count += 1 |
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453 }, |
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454 )?; |
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455 assert!( |
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456 !node.data.has_entry(), |
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457 "duplicate dirstate entry in read" |
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458 ); |
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459 assert!( |
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460 node.copy_source.is_none(), |
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461 "duplicate dirstate entry in read" |
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462 ); |
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463 node.data = NodeData::Entry(*entry); |
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464 node.copy_source = copy_source.map(Cow::Borrowed); |
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465 map.nodes_with_entry_count += 1; |
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466 if copy_source.is_some() { |
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467 map.nodes_with_copy_source_count += 1 |
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468 } |
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469 Ok(()) |
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470 }, |
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471 )?; |
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472 let parents = Some(parents.clone()); |
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473 |
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474 Ok((map, parents)) |
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475 } |
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476 |
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477 /// Assuming dirstate-v2 format, returns whether the next write should |
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478 /// append to the existing data file that contains `self.on_disk` (true), |
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479 /// or create a new data file from scratch (false). |
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480 pub(super) fn write_should_append(&self) -> bool { |
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481 let ratio = self.unreachable_bytes as f32 / self.on_disk.len() as f32; |
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482 ratio < ACCEPTABLE_UNREACHABLE_BYTES_RATIO |
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483 } |
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484 |
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485 fn get_node<'tree>( |
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486 &'tree self, |
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487 path: &HgPath, |
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488 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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489 let mut children = self.root.as_ref(); |
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490 let mut components = path.components(); |
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491 let mut component = |
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492 components.next().expect("expected at least one components"); |
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493 loop { |
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494 if let Some(child) = children.get(component, self.on_disk)? { |
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495 if let Some(next_component) = components.next() { |
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496 component = next_component; |
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497 children = child.children(self.on_disk)?; |
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498 } else { |
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499 return Ok(Some(child)); |
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500 } |
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501 } else { |
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502 return Ok(None); |
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503 } |
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504 } |
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505 } |
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506 |
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507 /// Returns a mutable reference to the node at `path` if it exists |
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508 /// |
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509 /// This takes `root` instead of `&mut self` so that callers can mutate |
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510 /// other fields while the returned borrow is still valid |
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511 fn get_node_mut<'tree>( |
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512 on_disk: &'on_disk [u8], |
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513 unreachable_bytes: &mut u32, |
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514 root: &'tree mut ChildNodes<'on_disk>, |
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515 path: &HgPath, |
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516 ) -> Result<Option<&'tree mut Node<'on_disk>>, DirstateV2ParseError> { |
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517 let mut children = root; |
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518 let mut components = path.components(); |
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519 let mut component = |
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520 components.next().expect("expected at least one components"); |
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521 loop { |
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522 if let Some(child) = children |
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523 .make_mut(on_disk, unreachable_bytes)? |
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524 .get_mut(component) |
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525 { |
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526 if let Some(next_component) = components.next() { |
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527 component = next_component; |
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528 children = &mut child.children; |
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529 } else { |
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530 return Ok(Some(child)); |
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531 } |
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532 } else { |
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533 return Ok(None); |
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534 } |
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535 } |
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536 } |
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537 |
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538 pub(super) fn get_or_insert<'tree, 'path>( |
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539 &'tree mut self, |
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540 path: &HgPath, |
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541 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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542 Self::get_or_insert_node( |
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543 self.on_disk, |
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544 &mut self.unreachable_bytes, |
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545 &mut self.root, |
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546 path, |
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547 WithBasename::to_cow_owned, |
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548 |_| {}, |
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549 ) |
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550 } |
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551 |
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552 fn get_or_insert_node<'tree, 'path>( |
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553 on_disk: &'on_disk [u8], |
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554 unreachable_bytes: &mut u32, |
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555 root: &'tree mut ChildNodes<'on_disk>, |
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556 path: &'path HgPath, |
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557 to_cow: impl Fn( |
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558 WithBasename<&'path HgPath>, |
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559 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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560 mut each_ancestor: impl FnMut(&mut Node), |
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561 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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562 let mut child_nodes = root; |
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563 let mut inclusive_ancestor_paths = |
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564 WithBasename::inclusive_ancestors_of(path); |
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565 let mut ancestor_path = inclusive_ancestor_paths |
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566 .next() |
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567 .expect("expected at least one inclusive ancestor"); |
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568 loop { |
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569 // TODO: can we avoid allocating an owned key in cases where the |
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570 // map already contains that key, without introducing double |
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571 // lookup? |
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572 let child_node = child_nodes |
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573 .make_mut(on_disk, unreachable_bytes)? |
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574 .entry(to_cow(ancestor_path)) |
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575 .or_default(); |
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576 if let Some(next) = inclusive_ancestor_paths.next() { |
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577 each_ancestor(child_node); |
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578 ancestor_path = next; |
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579 child_nodes = &mut child_node.children; |
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580 } else { |
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581 return Ok(child_node); |
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582 } |
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583 } |
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584 } |
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585 |
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586 fn add_or_remove_file( |
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587 &mut self, |
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588 path: &HgPath, |
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589 old_state: Option<EntryState>, |
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590 new_entry: DirstateEntry, |
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591 ) -> Result<(), DirstateV2ParseError> { |
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592 let had_entry = old_state.is_some(); |
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593 let was_tracked = old_state.map_or(false, |s| s.is_tracked()); |
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594 let tracked_count_increment = |
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595 match (was_tracked, new_entry.state().is_tracked()) { |
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596 (false, true) => 1, |
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597 (true, false) => -1, |
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598 _ => 0, |
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599 }; |
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600 |
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601 let node = Self::get_or_insert_node( |
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602 self.on_disk, |
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603 &mut self.unreachable_bytes, |
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604 &mut self.root, |
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605 path, |
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606 WithBasename::to_cow_owned, |
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607 |ancestor| { |
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608 if !had_entry { |
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609 ancestor.descendants_with_entry_count += 1; |
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610 } |
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611 |
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612 // We can’t use `+= increment` because the counter is unsigned, |
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613 // and we want debug builds to detect accidental underflow |
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614 // through zero |
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615 match tracked_count_increment { |
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616 1 => ancestor.tracked_descendants_count += 1, |
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617 -1 => ancestor.tracked_descendants_count -= 1, |
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618 _ => {} |
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619 } |
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620 }, |
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621 )?; |
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622 if !had_entry { |
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623 self.nodes_with_entry_count += 1 |
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624 } |
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625 node.data = NodeData::Entry(new_entry); |
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626 Ok(()) |
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627 } |
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628 |
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629 fn iter_nodes<'tree>( |
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630 &'tree self, |
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631 ) -> impl Iterator< |
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632 Item = Result<NodeRef<'tree, 'on_disk>, DirstateV2ParseError>, |
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633 > + 'tree { |
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634 // Depth first tree traversal. |
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635 // |
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636 // If we could afford internal iteration and recursion, |
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637 // this would look like: |
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638 // |
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639 // ``` |
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640 // fn traverse_children( |
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641 // children: &ChildNodes, |
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642 // each: &mut impl FnMut(&Node), |
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643 // ) { |
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644 // for child in children.values() { |
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645 // traverse_children(&child.children, each); |
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646 // each(child); |
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647 // } |
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648 // } |
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649 // ``` |
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650 // |
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651 // However we want an external iterator and therefore can’t use the |
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652 // call stack. Use an explicit stack instead: |
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653 let mut stack = Vec::new(); |
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654 let mut iter = self.root.as_ref().iter(); |
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655 std::iter::from_fn(move || { |
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656 while let Some(child_node) = iter.next() { |
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657 let children = match child_node.children(self.on_disk) { |
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658 Ok(children) => children, |
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659 Err(error) => return Some(Err(error)), |
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660 }; |
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661 // Pseudo-recursion |
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662 let new_iter = children.iter(); |
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663 let old_iter = std::mem::replace(&mut iter, new_iter); |
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664 stack.push((child_node, old_iter)); |
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665 } |
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666 // Found the end of a `children.iter()` iterator. |
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667 if let Some((child_node, next_iter)) = stack.pop() { |
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668 // "Return" from pseudo-recursion by restoring state from the |
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669 // explicit stack |
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670 iter = next_iter; |
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671 |
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672 Some(Ok(child_node)) |
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673 } else { |
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674 // Reached the bottom of the stack, we’re done |
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675 None |
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676 } |
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677 }) |
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678 } |
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679 |
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680 fn count_dropped_path(unreachable_bytes: &mut u32, path: &Cow<HgPath>) { |
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681 if let Cow::Borrowed(path) = path { |
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682 *unreachable_bytes += path.len() as u32 |
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683 } |
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684 } |
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685 } |
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686 |
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687 /// Like `Iterator::filter_map`, but over a fallible iterator of `Result`s. |
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688 /// |
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689 /// The callback is only called for incoming `Ok` values. Errors are passed |
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690 /// through as-is. In order to let it use the `?` operator the callback is |
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691 /// expected to return a `Result` of `Option`, instead of an `Option` of |
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692 /// `Result`. |
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693 fn filter_map_results<'a, I, F, A, B, E>( |
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694 iter: I, |
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695 f: F, |
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696 ) -> impl Iterator<Item = Result<B, E>> + 'a |
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697 where |
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698 I: Iterator<Item = Result<A, E>> + 'a, |
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699 F: Fn(A) -> Result<Option<B>, E> + 'a, |
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700 { |
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701 iter.filter_map(move |result| match result { |
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702 Ok(node) => f(node).transpose(), |
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703 Err(e) => Some(Err(e)), |
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704 }) |
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705 } |
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706 |
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707 impl OwningDirstateMap { |
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708 pub fn clear(&mut self) { |
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709 let map = self.get_map_mut(); |
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710 map.root = Default::default(); |
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711 map.nodes_with_entry_count = 0; |
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712 map.nodes_with_copy_source_count = 0; |
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713 } |
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714 |
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715 pub fn set_entry( |
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716 &mut self, |
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717 filename: &HgPath, |
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718 entry: DirstateEntry, |
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719 ) -> Result<(), DirstateV2ParseError> { |
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720 let map = self.get_map_mut(); |
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721 map.get_or_insert(&filename)?.data = NodeData::Entry(entry); |
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722 Ok(()) |
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723 } |
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724 |
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725 pub fn add_file( |
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726 &mut self, |
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727 filename: &HgPath, |
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728 entry: DirstateEntry, |
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729 ) -> Result<(), DirstateError> { |
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730 let old_state = self.get(filename)?.map(|e| e.state()); |
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731 let map = self.get_map_mut(); |
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732 Ok(map.add_or_remove_file(filename, old_state, entry)?) |
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733 } |
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734 |
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735 pub fn remove_file( |
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736 &mut self, |
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737 filename: &HgPath, |
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738 in_merge: bool, |
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739 ) -> Result<(), DirstateError> { |
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740 let old_entry_opt = self.get(filename)?; |
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741 let old_state = old_entry_opt.map(|e| e.state()); |
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742 let mut size = 0; |
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743 if in_merge { |
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744 // XXX we should not be able to have 'm' state and 'FROM_P2' if not |
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745 // during a merge. So I (marmoute) am not sure we need the |
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746 // conditionnal at all. Adding double checking this with assert |
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747 // would be nice. |
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748 if let Some(old_entry) = old_entry_opt { |
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749 // backup the previous state |
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750 if old_entry.state() == EntryState::Merged { |
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751 size = SIZE_NON_NORMAL; |
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752 } else if old_entry.state() == EntryState::Normal |
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753 && old_entry.size() == SIZE_FROM_OTHER_PARENT |
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754 { |
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755 // other parent |
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756 size = SIZE_FROM_OTHER_PARENT; |
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757 } |
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758 } |
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759 } |
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760 if size == 0 { |
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761 self.copy_map_remove(filename)?; |
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762 } |
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763 let map = self.get_map_mut(); |
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764 let entry = DirstateEntry::new_removed(size); |
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765 Ok(map.add_or_remove_file(filename, old_state, entry)?) |
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766 } |
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767 |
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768 pub fn drop_entry_and_copy_source( |
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769 &mut self, |
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770 filename: &HgPath, |
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771 ) -> Result<(), DirstateError> { |
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772 let was_tracked = self |
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773 .get(filename)? |
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774 .map_or(false, |e| e.state().is_tracked()); |
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775 let map = self.get_map_mut(); |
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776 struct Dropped { |
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777 was_tracked: bool, |
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778 had_entry: bool, |
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779 had_copy_source: bool, |
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780 } |
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781 |
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782 /// If this returns `Ok(Some((dropped, removed)))`, then |
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783 /// |
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784 /// * `dropped` is about the leaf node that was at `filename` |
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785 /// * `removed` is whether this particular level of recursion just |
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786 /// removed a node in `nodes`. |
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787 fn recur<'on_disk>( |
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788 on_disk: &'on_disk [u8], |
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789 unreachable_bytes: &mut u32, |
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790 nodes: &mut ChildNodes<'on_disk>, |
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791 path: &HgPath, |
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792 ) -> Result<Option<(Dropped, bool)>, DirstateV2ParseError> { |
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793 let (first_path_component, rest_of_path) = |
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794 path.split_first_component(); |
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795 let nodes = nodes.make_mut(on_disk, unreachable_bytes)?; |
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796 let node = if let Some(node) = nodes.get_mut(first_path_component) |
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797 { |
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798 node |
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799 } else { |
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800 return Ok(None); |
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801 }; |
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802 let dropped; |
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803 if let Some(rest) = rest_of_path { |
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|
804 if let Some((d, removed)) = recur( |
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|
805 on_disk, |
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806 unreachable_bytes, |
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807 &mut node.children, |
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|
808 rest, |
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|
809 )? { |
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|
810 dropped = d; |
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|
811 if dropped.had_entry { |
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812 node.descendants_with_entry_count -= 1; |
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diff
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|
813 } |
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|
814 if dropped.was_tracked { |
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|
815 node.tracked_descendants_count -= 1; |
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|
816 } |
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817 |
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|
818 // Directory caches must be invalidated when removing a |
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|
819 // child node |
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820 if removed { |
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821 if let NodeData::CachedDirectory { .. } = &node.data { |
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|
822 node.data = NodeData::None |
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823 } |
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824 } |
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825 } else { |
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826 return Ok(None); |
47120
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dirstate-tree: Fold "tracked descendants" counter update in main walk
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|
827 } |
47192
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828 } else { |
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829 let had_entry = node.data.has_entry(); |
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830 if had_entry { |
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831 node.data = NodeData::None |
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832 } |
47681
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833 if let Some(source) = &node.copy_source { |
48050
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834 DirstateMap::count_dropped_path(unreachable_bytes, source); |
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835 node.copy_source = None |
47681
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|
836 } |
47192
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dirstate-tree: Refactor DirstateMap::drop_file to be recursive
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837 dropped = Dropped { |
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|
838 was_tracked: node |
47348
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|
839 .data |
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840 .as_entry() |
48022
f2a9db29cb2d
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diff
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|
841 .map_or(false, |entry| entry.state().is_tracked()), |
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842 had_entry, |
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843 had_copy_source: node.copy_source.take().is_some(), |
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844 }; |
47193
47ccab19bf9f
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845 } |
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846 // After recursion, for both leaf (rest_of_path is None) nodes and |
47ccab19bf9f
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|
847 // parent nodes, remove a node if it just became empty. |
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|
848 let remove = !node.data.has_entry() |
47193
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|
849 && node.copy_source.is_none() |
47352
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|
850 && node.children.is_empty(); |
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|
851 if remove { |
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852 let (key, _) = |
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853 nodes.remove_entry(first_path_component).unwrap(); |
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854 DirstateMap::count_dropped_path( |
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855 unreachable_bytes, |
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|
856 key.full_path(), |
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|
857 ) |
47192
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|
858 } |
47352
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|
859 Ok(Some((dropped, remove))) |
47192
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|
860 } |
47107
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|
861 |
47681
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862 if let Some((dropped, _removed)) = recur( |
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|
863 map.on_disk, |
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|
864 &mut map.unreachable_bytes, |
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865 &mut map.root, |
47681
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|
866 filename, |
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|
867 )? { |
47192
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|
868 if dropped.had_entry { |
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|
869 map.nodes_with_entry_count -= 1 |
47107
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|
870 } |
47192
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|
871 if dropped.had_copy_source { |
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|
872 map.nodes_with_copy_source_count -= 1 |
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|
873 } |
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|
874 } else { |
48026
1b2ee68e85f9
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|
875 debug_assert!(!was_tracked); |
47107
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|
876 } |
48048
76f1c76186a1
dirstate: Remove return boolean from dirstatemap.dropfile
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|
877 Ok(()) |
47095
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|
878 } |
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diff
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|
879 |
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|
880 pub fn has_tracked_dir( |
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|
881 &mut self, |
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|
882 directory: &HgPath, |
47335
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|
883 ) -> Result<bool, DirstateError> { |
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|
884 let map = self.get_map_mut(); |
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|
885 if let Some(node) = map.get_node(directory)? { |
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|
886 // A node without a `DirstateEntry` was created to hold child |
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|
887 // nodes, and is therefore a directory. |
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|
888 let state = node.state()?; |
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|
889 Ok(state.is_none() && node.tracked_descendants_count() > 0) |
47106
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|
890 } else { |
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|
891 Ok(false) |
52906934b775
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|
892 } |
47095
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|
893 } |
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diff
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|
894 |
48069
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changeset
|
895 pub fn has_dir( |
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|
896 &mut self, |
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|
897 directory: &HgPath, |
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|
898 ) -> Result<bool, DirstateError> { |
3d0a9c6e614d
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|
899 let map = self.get_map_mut(); |
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|
900 if let Some(node) = map.get_node(directory)? { |
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|
901 // A node without a `DirstateEntry` was created to hold child |
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|
902 // nodes, and is therefore a directory. |
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changeset
|
903 let state = node.state()?; |
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|
904 Ok(state.is_none() && node.descendants_with_entry_count() > 0) |
47106
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|
905 } else { |
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|
906 Ok(false) |
52906934b775
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|
907 } |
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|
908 } |
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Simon Sapin <simon.sapin@octobus.net>
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|
909 |
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|
910 #[timed] |
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|
911 pub fn pack_v1( |
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912 &self, |
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|
913 parents: DirstateParents, |
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|
914 ) -> Result<Vec<u8>, DirstateError> { |
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915 let map = self.get_map(); |
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916 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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917 // reallocations |
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|
918 let mut size = parents.as_bytes().len(); |
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|
919 for node in map.iter_nodes() { |
47335
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|
920 let node = node?; |
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|
921 if node.entry()?.is_some() { |
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|
922 size += packed_entry_size( |
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923 node.full_path(map.on_disk)?, |
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924 node.copy_source(map.on_disk)?, |
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|
925 ); |
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|
926 } |
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|
927 } |
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|
928 |
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|
929 let mut packed = Vec::with_capacity(size); |
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930 packed.extend(parents.as_bytes()); |
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|
931 |
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932 for node in map.iter_nodes() { |
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933 let node = node?; |
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934 if let Some(entry) = node.entry()? { |
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|
935 pack_entry( |
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|
936 node.full_path(map.on_disk)?, |
47333
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|
937 &entry, |
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938 node.copy_source(map.on_disk)?, |
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|
939 &mut packed, |
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|
940 ); |
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|
941 } |
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942 } |
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|
943 Ok(packed) |
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944 } |
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|
945 |
47682
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|
946 /// Returns new data and metadata together with whether that data should be |
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|
947 /// appended to the existing data file whose content is at |
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948 /// `map.on_disk` (true), instead of written to a new data file |
47682
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|
949 /// (false). |
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950 #[timed] |
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951 pub fn pack_v2( |
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|
952 &self, |
47678
065e61628980
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953 can_append: bool, |
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954 ) -> Result<(Vec<u8>, Vec<u8>, bool), DirstateError> { |
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955 let map = self.get_map(); |
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|
956 on_disk::write(map, can_append) |
47280
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|
957 } |
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|
958 |
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|
959 pub fn status<'a>( |
47112
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|
960 &'a mut self, |
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|
961 matcher: &'a (dyn Matcher + Sync), |
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|
962 root_dir: PathBuf, |
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|
963 ignore_files: Vec<PathBuf>, |
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|
964 options: StatusOptions, |
47110
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47109
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|
965 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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|
966 { |
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967 let map = self.get_map_mut(); |
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|
968 super::status::status(map, matcher, root_dir, ignore_files, options) |
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969 } |
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|
970 |
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|
971 pub fn copy_map_len(&self) -> usize { |
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972 let map = self.get_map(); |
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|
973 map.nodes_with_copy_source_count as usize |
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|
974 } |
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|
975 |
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|
976 pub fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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977 let map = self.get_map(); |
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978 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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979 Ok(if let Some(source) = node.copy_source(map.on_disk)? { |
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980 Some((node.full_path(map.on_disk)?, source)) |
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981 } else { |
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|
982 None |
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983 }) |
47100
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984 })) |
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985 } |
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|
986 |
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987 pub fn copy_map_contains_key( |
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988 &self, |
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989 key: &HgPath, |
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990 ) -> Result<bool, DirstateV2ParseError> { |
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991 let map = self.get_map(); |
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992 Ok(if let Some(node) = map.get_node(key)? { |
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|
993 node.has_copy_source() |
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994 } else { |
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995 false |
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996 }) |
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997 } |
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998 |
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999 pub fn copy_map_get( |
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1000 &self, |
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1001 key: &HgPath, |
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1002 ) -> Result<Option<&HgPath>, DirstateV2ParseError> { |
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1003 let map = self.get_map(); |
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1004 if let Some(node) = map.get_node(key)? { |
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1005 if let Some(source) = node.copy_source(map.on_disk)? { |
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1006 return Ok(Some(source)); |
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1007 } |
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1008 } |
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1009 Ok(None) |
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1010 } |
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1011 |
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1012 pub fn copy_map_remove( |
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1013 &mut self, |
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1014 key: &HgPath, |
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1015 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1016 let map = self.get_map_mut(); |
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1017 let count = &mut map.nodes_with_copy_source_count; |
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1018 let unreachable_bytes = &mut map.unreachable_bytes; |
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1019 Ok(DirstateMap::get_node_mut( |
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1020 map.on_disk, |
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1021 unreachable_bytes, |
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1022 &mut map.root, |
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1023 key, |
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1024 )? |
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1025 .and_then(|node| { |
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1026 if let Some(source) = &node.copy_source { |
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1027 *count -= 1; |
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1028 DirstateMap::count_dropped_path(unreachable_bytes, source); |
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1029 } |
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1030 node.copy_source.take().map(Cow::into_owned) |
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1031 })) |
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1032 } |
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1033 |
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1034 pub fn copy_map_insert( |
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1035 &mut self, |
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1036 key: HgPathBuf, |
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1037 value: HgPathBuf, |
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1038 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1039 let map = self.get_map_mut(); |
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1040 let node = DirstateMap::get_or_insert_node( |
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1041 map.on_disk, |
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1042 &mut map.unreachable_bytes, |
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1043 &mut map.root, |
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1044 &key, |
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1045 WithBasename::to_cow_owned, |
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1046 |_ancestor| {}, |
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1047 )?; |
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1048 if node.copy_source.is_none() { |
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1049 map.nodes_with_copy_source_count += 1 |
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1050 } |
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1051 Ok(node.copy_source.replace(value.into()).map(Cow::into_owned)) |
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1052 } |
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1053 |
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1054 pub fn len(&self) -> usize { |
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1055 let map = self.get_map(); |
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1056 map.nodes_with_entry_count as usize |
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1057 } |
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1058 |
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1059 pub fn contains_key( |
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1060 &self, |
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1061 key: &HgPath, |
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1062 ) -> Result<bool, DirstateV2ParseError> { |
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1063 Ok(self.get(key)?.is_some()) |
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1064 } |
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1065 |
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1066 pub fn get( |
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1067 &self, |
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1068 key: &HgPath, |
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1069 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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1070 let map = self.get_map(); |
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1071 Ok(if let Some(node) = map.get_node(key)? { |
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1072 node.entry()? |
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1073 } else { |
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1074 None |
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1075 }) |
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1076 } |
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1077 |
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1078 pub fn iter(&self) -> StateMapIter<'_> { |
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1079 let map = self.get_map(); |
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1080 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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1081 Ok(if let Some(entry) = node.entry()? { |
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1082 Some((node.full_path(map.on_disk)?, entry)) |
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1083 } else { |
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1084 None |
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1085 }) |
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1086 })) |
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1087 } |
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1088 |
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1089 pub fn iter_tracked_dirs( |
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1090 &mut self, |
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1091 ) -> Result< |
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1092 Box< |
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1093 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> |
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1094 + Send |
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1095 + '_, |
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1096 >, |
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1097 DirstateError, |
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1098 > { |
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1099 let map = self.get_map_mut(); |
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1100 let on_disk = map.on_disk; |
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1101 Ok(Box::new(filter_map_results( |
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1102 map.iter_nodes(), |
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1103 move |node| { |
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1104 Ok(if node.tracked_descendants_count() > 0 { |
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1105 Some(node.full_path(on_disk)?) |
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1106 } else { |
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1107 None |
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1108 }) |
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1109 }, |
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1110 ))) |
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1111 } |
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1112 |
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1113 pub fn debug_iter( |
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1114 &self, |
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1115 all: bool, |
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1116 ) -> Box< |
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1117 dyn Iterator< |
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1118 Item = Result< |
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1119 (&HgPath, (u8, i32, i32, i32)), |
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1120 DirstateV2ParseError, |
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1121 >, |
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1122 > + Send |
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1123 + '_, |
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1124 > { |
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1125 let map = self.get_map(); |
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1126 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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1127 let debug_tuple = if let Some(entry) = node.entry()? { |
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1128 entry.debug_tuple() |
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1129 } else if !all { |
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1130 return Ok(None); |
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1131 } else if let Some(mtime) = node.cached_directory_mtime()? { |
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1132 (b' ', 0, -1, mtime.truncated_seconds() as i32) |
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1133 } else { |
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1134 (b' ', 0, -1, -1) |
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1135 }; |
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1136 Ok(Some((node.full_path(map.on_disk)?, debug_tuple))) |
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1137 })) |
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1138 } |
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1139 } |