Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47337:0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
TODO: more description
Differential Revision: https://phab.mercurial-scm.org/D10751
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 19 May 2021 13:15:00 +0200 |
parents | 8d0260d0dbc9 |
children | 73ddcedeaadf |
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::convert::TryInto; |
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5 use std::path::PathBuf; |
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6 |
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7 use super::on_disk; |
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8 use super::on_disk::DirstateV2ParseError; |
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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::parsers::Timestamp; |
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14 use crate::matchers::Matcher; |
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15 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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16 use crate::CopyMapIter; |
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17 use crate::DirstateEntry; |
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18 use crate::DirstateError; |
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19 use crate::DirstateParents; |
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20 use crate::DirstateStatus; |
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21 use crate::EntryState; |
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22 use crate::FastHashMap; |
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23 use crate::PatternFileWarning; |
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24 use crate::StateMapIter; |
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25 use crate::StatusError; |
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26 use crate::StatusOptions; |
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27 |
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28 pub struct DirstateMap<'on_disk> { |
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29 /// Contents of the `.hg/dirstate` file |
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30 pub(super) on_disk: &'on_disk [u8], |
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31 |
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32 pub(super) root: ChildNodes<'on_disk>, |
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33 |
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34 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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35 pub(super) nodes_with_entry_count: u32, |
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36 |
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37 /// Number of nodes anywhere in the tree that have |
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38 /// `.copy_source.is_some()`. |
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39 pub(super) nodes_with_copy_source_count: u32, |
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40 } |
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41 |
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42 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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43 /// map key would also work: all paths in a given map have the same parent |
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44 /// path, so comparing full paths gives the same result as comparing base |
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45 /// names. However `HashMap` would waste time always re-hashing the same |
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46 /// string prefix. |
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47 pub(super) type NodeKey<'on_disk> = WithBasename<Cow<'on_disk, HgPath>>; |
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48 |
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49 pub(super) enum ChildNodes<'on_disk> { |
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50 InMemory(FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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51 OnDisk(&'on_disk [on_disk::Node]), |
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52 } |
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53 |
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54 pub(super) enum ChildNodesRef<'tree, 'on_disk> { |
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55 InMemory(&'tree FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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56 OnDisk(&'on_disk [on_disk::Node]), |
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57 } |
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58 |
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59 pub(super) enum NodeRef<'tree, 'on_disk> { |
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60 InMemory(&'tree NodeKey<'on_disk>, &'tree Node<'on_disk>), |
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61 OnDisk(&'on_disk on_disk::Node), |
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62 } |
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63 |
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64 impl Default for ChildNodes<'_> { |
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65 fn default() -> Self { |
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66 ChildNodes::InMemory(Default::default()) |
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67 } |
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68 } |
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69 |
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70 impl<'on_disk> ChildNodes<'on_disk> { |
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71 pub(super) fn as_ref<'tree>( |
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72 &'tree self, |
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73 ) -> ChildNodesRef<'tree, 'on_disk> { |
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74 match self { |
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75 ChildNodes::InMemory(nodes) => ChildNodesRef::InMemory(nodes), |
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76 ChildNodes::OnDisk(nodes) => ChildNodesRef::OnDisk(nodes), |
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77 } |
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78 } |
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79 |
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80 pub(super) fn is_empty(&self) -> bool { |
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81 match self { |
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82 ChildNodes::InMemory(nodes) => nodes.is_empty(), |
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83 ChildNodes::OnDisk(nodes) => nodes.is_empty(), |
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84 } |
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85 } |
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86 |
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87 pub(super) fn make_mut( |
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88 &mut self, |
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89 on_disk: &'on_disk [u8], |
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90 ) -> Result< |
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91 &mut FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>, |
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92 DirstateV2ParseError, |
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93 > { |
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94 match self { |
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95 ChildNodes::InMemory(nodes) => Ok(nodes), |
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96 ChildNodes::OnDisk(nodes) => { |
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97 let nodes = nodes |
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98 .iter() |
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99 .map(|node| { |
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100 Ok(( |
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101 node.path(on_disk)?, |
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102 node.to_in_memory_node(on_disk)?, |
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103 )) |
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104 }) |
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105 .collect::<Result<_, _>>()?; |
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106 *self = ChildNodes::InMemory(nodes); |
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107 match self { |
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108 ChildNodes::InMemory(nodes) => Ok(nodes), |
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109 ChildNodes::OnDisk(_) => unreachable!(), |
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110 } |
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111 } |
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112 } |
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113 } |
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114 } |
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115 |
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116 impl<'tree, 'on_disk> ChildNodesRef<'tree, 'on_disk> { |
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117 pub(super) fn get( |
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118 &self, |
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119 base_name: &HgPath, |
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120 on_disk: &'on_disk [u8], |
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121 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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122 match self { |
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123 ChildNodesRef::InMemory(nodes) => Ok(nodes |
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124 .get_key_value(base_name) |
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125 .map(|(k, v)| NodeRef::InMemory(k, v))), |
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126 ChildNodesRef::OnDisk(nodes) => { |
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127 let mut parse_result = Ok(()); |
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128 let search_result = nodes.binary_search_by(|node| { |
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129 match node.base_name(on_disk) { |
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130 Ok(node_base_name) => node_base_name.cmp(base_name), |
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131 Err(e) => { |
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132 parse_result = Err(e); |
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133 // Dummy comparison result, `search_result` won’t |
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134 // be used since `parse_result` is an error |
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135 std::cmp::Ordering::Equal |
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136 } |
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137 } |
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138 }); |
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139 parse_result.map(|()| { |
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140 search_result.ok().map(|i| NodeRef::OnDisk(&nodes[i])) |
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141 }) |
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142 } |
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143 } |
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144 } |
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145 |
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146 /// Iterate in undefined order |
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147 pub(super) fn iter( |
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148 &self, |
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149 ) -> impl Iterator<Item = NodeRef<'tree, 'on_disk>> { |
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150 match self { |
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151 ChildNodesRef::InMemory(nodes) => itertools::Either::Left( |
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152 nodes.iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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153 ), |
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154 ChildNodesRef::OnDisk(nodes) => { |
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155 itertools::Either::Right(nodes.iter().map(NodeRef::OnDisk)) |
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156 } |
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157 } |
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158 } |
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159 |
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160 /// Iterate in parallel in undefined order |
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161 pub(super) fn par_iter( |
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162 &self, |
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163 ) -> impl rayon::iter::ParallelIterator<Item = NodeRef<'tree, 'on_disk>> |
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164 { |
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165 use rayon::prelude::*; |
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166 match self { |
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167 ChildNodesRef::InMemory(nodes) => rayon::iter::Either::Left( |
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168 nodes.par_iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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169 ), |
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170 ChildNodesRef::OnDisk(nodes) => rayon::iter::Either::Right( |
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171 nodes.par_iter().map(NodeRef::OnDisk), |
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172 ), |
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173 } |
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174 } |
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175 |
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176 pub(super) fn sorted(&self) -> Vec<NodeRef<'tree, 'on_disk>> { |
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177 match self { |
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178 ChildNodesRef::InMemory(nodes) => { |
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179 let mut vec: Vec<_> = nodes |
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180 .iter() |
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181 .map(|(k, v)| NodeRef::InMemory(k, v)) |
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182 .collect(); |
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183 fn sort_key<'a>(node: &'a NodeRef) -> &'a HgPath { |
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184 match node { |
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185 NodeRef::InMemory(path, _node) => path.base_name(), |
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186 NodeRef::OnDisk(_) => unreachable!(), |
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187 } |
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188 } |
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189 // `sort_unstable_by_key` doesn’t allow keys borrowing from the |
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190 // value: https://github.com/rust-lang/rust/issues/34162 |
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191 vec.sort_unstable_by(|a, b| sort_key(a).cmp(sort_key(b))); |
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192 vec |
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193 } |
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194 ChildNodesRef::OnDisk(nodes) => { |
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195 // Nodes on disk are already sorted |
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196 nodes.iter().map(NodeRef::OnDisk).collect() |
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197 } |
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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 impl<'tree, 'on_disk> NodeRef<'tree, 'on_disk> { |
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203 pub(super) fn full_path( |
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204 &self, |
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205 on_disk: &'on_disk [u8], |
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206 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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207 match self { |
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208 NodeRef::InMemory(path, _node) => Ok(path.full_path()), |
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209 NodeRef::OnDisk(node) => node.full_path(on_disk), |
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210 } |
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211 } |
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212 |
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213 /// Returns a `Cow` that can borrow 'on_disk but is detached from 'tree |
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214 pub(super) fn full_path_cow( |
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215 &self, |
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216 on_disk: &'on_disk [u8], |
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217 ) -> Result<Cow<'on_disk, HgPath>, DirstateV2ParseError> { |
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218 match self { |
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219 NodeRef::InMemory(path, _node) => Ok(path.full_path().clone()), |
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220 NodeRef::OnDisk(node) => { |
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221 Ok(Cow::Borrowed(node.full_path(on_disk)?)) |
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222 } |
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223 } |
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224 } |
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225 |
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226 pub(super) fn base_name( |
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227 &self, |
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228 on_disk: &'on_disk [u8], |
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229 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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230 match self { |
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231 NodeRef::InMemory(path, _node) => Ok(path.base_name()), |
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232 NodeRef::OnDisk(node) => node.base_name(on_disk), |
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233 } |
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234 } |
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235 |
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236 pub(super) fn children( |
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237 &self, |
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238 on_disk: &'on_disk [u8], |
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239 ) -> Result<ChildNodesRef<'tree, 'on_disk>, DirstateV2ParseError> { |
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240 match self { |
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241 NodeRef::InMemory(_path, node) => Ok(node.children.as_ref()), |
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242 NodeRef::OnDisk(node) => { |
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243 Ok(ChildNodesRef::OnDisk(node.children(on_disk)?)) |
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244 } |
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245 } |
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246 } |
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247 |
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248 pub(super) fn has_copy_source(&self) -> bool { |
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249 match self { |
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250 NodeRef::InMemory(_path, node) => node.copy_source.is_some(), |
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251 NodeRef::OnDisk(node) => node.has_copy_source(), |
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252 } |
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253 } |
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254 |
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255 pub(super) fn copy_source( |
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256 &self, |
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257 on_disk: &'on_disk [u8], |
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258 ) -> Result<Option<&'tree HgPath>, DirstateV2ParseError> { |
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259 match self { |
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260 NodeRef::InMemory(_path, node) => { |
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261 Ok(node.copy_source.as_ref().map(|s| &**s)) |
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262 } |
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263 NodeRef::OnDisk(node) => node.copy_source(on_disk), |
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264 } |
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265 } |
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266 |
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267 pub(super) fn has_entry(&self) -> bool { |
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268 match self { |
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269 NodeRef::InMemory(_path, node) => node.entry.is_some(), |
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270 NodeRef::OnDisk(node) => node.has_entry(), |
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271 } |
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272 } |
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273 |
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274 pub(super) fn entry( |
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275 &self, |
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276 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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277 match self { |
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278 NodeRef::InMemory(_path, node) => Ok(node.entry), |
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279 NodeRef::OnDisk(node) => node.entry(), |
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280 } |
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281 } |
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282 |
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283 pub(super) fn state( |
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284 &self, |
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285 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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286 match self { |
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287 NodeRef::InMemory(_path, node) => { |
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288 Ok(node.entry.as_ref().map(|entry| entry.state)) |
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289 } |
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290 NodeRef::OnDisk(node) => node.state(), |
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291 } |
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292 } |
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293 |
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294 pub(super) fn tracked_descendants_count(&self) -> u32 { |
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295 match self { |
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296 NodeRef::InMemory(_path, node) => node.tracked_descendants_count, |
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297 NodeRef::OnDisk(node) => node.tracked_descendants_count.get(), |
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298 } |
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299 } |
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300 } |
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301 |
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302 /// Represents a file or a directory |
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303 #[derive(Default)] |
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304 pub(super) struct Node<'on_disk> { |
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305 /// `None` for directories |
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306 pub(super) entry: Option<DirstateEntry>, |
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307 |
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308 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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309 |
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310 pub(super) children: ChildNodes<'on_disk>, |
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311 |
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312 /// How many (non-inclusive) descendants of this node are tracked files |
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313 pub(super) tracked_descendants_count: u32, |
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314 } |
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315 |
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316 impl<'on_disk> DirstateMap<'on_disk> { |
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317 pub(super) fn empty(on_disk: &'on_disk [u8]) -> Self { |
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318 Self { |
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319 on_disk, |
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320 root: ChildNodes::default(), |
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321 nodes_with_entry_count: 0, |
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322 nodes_with_copy_source_count: 0, |
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323 } |
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324 } |
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325 |
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326 #[timed] |
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327 pub fn new_v2( |
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328 on_disk: &'on_disk [u8], |
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329 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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330 Ok(on_disk::read(on_disk)?) |
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331 } |
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332 |
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333 #[timed] |
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334 pub fn new_v1( |
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335 on_disk: &'on_disk [u8], |
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336 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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337 let mut map = Self::empty(on_disk); |
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338 if map.on_disk.is_empty() { |
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339 return Ok((map, None)); |
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340 } |
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341 |
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342 let parents = parse_dirstate_entries( |
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343 map.on_disk, |
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344 |path, entry, copy_source| { |
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345 let tracked = entry.state.is_tracked(); |
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346 let node = Self::get_or_insert_node( |
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347 map.on_disk, |
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348 &mut map.root, |
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349 path, |
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350 WithBasename::to_cow_borrowed, |
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351 |ancestor| { |
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352 if tracked { |
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353 ancestor.tracked_descendants_count += 1 |
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354 } |
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355 }, |
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356 )?; |
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357 assert!( |
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358 node.entry.is_none(), |
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359 "duplicate dirstate entry in read" |
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360 ); |
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361 assert!( |
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362 node.copy_source.is_none(), |
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363 "duplicate dirstate entry in read" |
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364 ); |
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365 node.entry = Some(*entry); |
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366 node.copy_source = copy_source.map(Cow::Borrowed); |
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367 map.nodes_with_entry_count += 1; |
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368 if copy_source.is_some() { |
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369 map.nodes_with_copy_source_count += 1 |
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370 } |
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371 Ok(()) |
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372 }, |
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373 )?; |
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374 let parents = Some(parents.clone()); |
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375 |
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376 Ok((map, parents)) |
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377 } |
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378 |
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379 fn get_node<'tree>( |
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380 &'tree self, |
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381 path: &HgPath, |
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382 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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383 let mut children = self.root.as_ref(); |
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384 let mut components = path.components(); |
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385 let mut component = |
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386 components.next().expect("expected at least one components"); |
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387 loop { |
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388 if let Some(child) = children.get(component, self.on_disk)? { |
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389 if let Some(next_component) = components.next() { |
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390 component = next_component; |
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391 children = child.children(self.on_disk)?; |
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392 } else { |
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393 return Ok(Some(child)); |
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394 } |
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395 } else { |
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396 return Ok(None); |
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397 } |
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398 } |
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399 } |
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400 |
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401 /// Returns a mutable reference to the node at `path` if it exists |
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402 /// |
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403 /// This takes `root` instead of `&mut self` so that callers can mutate |
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404 /// other fields while the returned borrow is still valid |
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405 fn get_node_mut<'tree>( |
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406 on_disk: &'on_disk [u8], |
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407 root: &'tree mut ChildNodes<'on_disk>, |
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408 path: &HgPath, |
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409 ) -> Result<Option<&'tree mut Node<'on_disk>>, DirstateV2ParseError> { |
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410 let mut children = root; |
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411 let mut components = path.components(); |
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412 let mut component = |
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413 components.next().expect("expected at least one components"); |
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414 loop { |
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415 if let Some(child) = children.make_mut(on_disk)?.get_mut(component) |
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416 { |
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417 if let Some(next_component) = components.next() { |
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418 component = next_component; |
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419 children = &mut child.children; |
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420 } else { |
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421 return Ok(Some(child)); |
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422 } |
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423 } else { |
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424 return Ok(None); |
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425 } |
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426 } |
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427 } |
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428 |
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429 fn get_or_insert_node<'tree, 'path>( |
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430 on_disk: &'on_disk [u8], |
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431 root: &'tree mut ChildNodes<'on_disk>, |
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432 path: &'path HgPath, |
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433 to_cow: impl Fn( |
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434 WithBasename<&'path HgPath>, |
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435 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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436 mut each_ancestor: impl FnMut(&mut Node), |
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437 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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438 let mut child_nodes = root; |
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439 let mut inclusive_ancestor_paths = |
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440 WithBasename::inclusive_ancestors_of(path); |
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441 let mut ancestor_path = inclusive_ancestor_paths |
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442 .next() |
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443 .expect("expected at least one inclusive ancestor"); |
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444 loop { |
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445 // TODO: can we avoid allocating an owned key in cases where the |
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446 // map already contains that key, without introducing double |
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447 // lookup? |
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448 let child_node = child_nodes |
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449 .make_mut(on_disk)? |
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450 .entry(to_cow(ancestor_path)) |
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451 .or_default(); |
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452 if let Some(next) = inclusive_ancestor_paths.next() { |
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453 each_ancestor(child_node); |
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454 ancestor_path = next; |
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455 child_nodes = &mut child_node.children; |
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456 } else { |
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457 return Ok(child_node); |
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458 } |
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459 } |
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460 } |
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461 |
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462 fn add_or_remove_file( |
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463 &mut self, |
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464 path: &HgPath, |
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465 old_state: EntryState, |
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466 new_entry: DirstateEntry, |
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467 ) -> Result<(), DirstateV2ParseError> { |
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468 let tracked_count_increment = |
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469 match (old_state.is_tracked(), new_entry.state.is_tracked()) { |
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470 (false, true) => 1, |
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471 (true, false) => -1, |
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472 _ => 0, |
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473 }; |
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474 |
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475 let node = Self::get_or_insert_node( |
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476 self.on_disk, |
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477 &mut self.root, |
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478 path, |
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479 WithBasename::to_cow_owned, |
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480 |ancestor| { |
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481 // We can’t use `+= increment` because the counter is unsigned, |
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482 // and we want debug builds to detect accidental underflow |
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483 // through zero |
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484 match tracked_count_increment { |
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485 1 => ancestor.tracked_descendants_count += 1, |
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486 -1 => ancestor.tracked_descendants_count -= 1, |
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487 _ => {} |
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488 } |
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489 }, |
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490 )?; |
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491 if node.entry.is_none() { |
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492 self.nodes_with_entry_count += 1 |
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493 } |
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494 node.entry = Some(new_entry); |
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495 Ok(()) |
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496 } |
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497 |
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498 fn iter_nodes<'tree>( |
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499 &'tree self, |
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500 ) -> impl Iterator< |
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501 Item = Result<NodeRef<'tree, 'on_disk>, DirstateV2ParseError>, |
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502 > + 'tree { |
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503 // Depth first tree traversal. |
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504 // |
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505 // If we could afford internal iteration and recursion, |
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506 // this would look like: |
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507 // |
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508 // ``` |
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509 // fn traverse_children( |
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510 // children: &ChildNodes, |
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511 // each: &mut impl FnMut(&Node), |
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512 // ) { |
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513 // for child in children.values() { |
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514 // traverse_children(&child.children, each); |
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515 // each(child); |
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516 // } |
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517 // } |
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518 // ``` |
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519 // |
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520 // However we want an external iterator and therefore can’t use the |
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521 // call stack. Use an explicit stack instead: |
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522 let mut stack = Vec::new(); |
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523 let mut iter = self.root.as_ref().iter(); |
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524 std::iter::from_fn(move || { |
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525 while let Some(child_node) = iter.next() { |
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526 let children = match child_node.children(self.on_disk) { |
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527 Ok(children) => children, |
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528 Err(error) => return Some(Err(error)), |
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529 }; |
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530 // Pseudo-recursion |
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531 let new_iter = children.iter(); |
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532 let old_iter = std::mem::replace(&mut iter, new_iter); |
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533 stack.push((child_node, old_iter)); |
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534 } |
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535 // Found the end of a `children.iter()` iterator. |
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536 if let Some((child_node, next_iter)) = stack.pop() { |
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537 // "Return" from pseudo-recursion by restoring state from the |
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538 // explicit stack |
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539 iter = next_iter; |
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540 |
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541 Some(Ok(child_node)) |
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542 } else { |
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543 // Reached the bottom of the stack, we’re done |
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544 None |
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545 } |
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546 }) |
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547 } |
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548 |
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549 fn clear_known_ambiguous_mtimes( |
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550 &mut self, |
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551 paths: &[impl AsRef<HgPath>], |
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552 ) -> Result<(), DirstateV2ParseError> { |
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553 for path in paths { |
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554 if let Some(node) = Self::get_node_mut( |
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555 self.on_disk, |
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556 &mut self.root, |
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557 path.as_ref(), |
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558 )? { |
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559 if let Some(entry) = node.entry.as_mut() { |
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560 entry.clear_mtime(); |
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561 } |
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562 } |
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563 } |
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564 Ok(()) |
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565 } |
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566 |
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567 /// Return a faillilble iterator of full paths of nodes that have an |
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568 /// `entry` for which the given `predicate` returns true. |
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569 /// |
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570 /// Fallibility means that each iterator item is a `Result`, which may |
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571 /// indicate a parse error of the on-disk dirstate-v2 format. Such errors |
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572 /// should only happen if Mercurial is buggy or a repository is corrupted. |
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573 fn filter_full_paths<'tree>( |
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574 &'tree self, |
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575 predicate: impl Fn(&DirstateEntry) -> bool + 'tree, |
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576 ) -> impl Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + 'tree |
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577 { |
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578 filter_map_results(self.iter_nodes(), move |node| { |
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579 if let Some(entry) = node.entry()? { |
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580 if predicate(&entry) { |
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581 return Ok(Some(node.full_path(self.on_disk)?)); |
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582 } |
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583 } |
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584 Ok(None) |
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585 }) |
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586 } |
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587 } |
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588 |
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589 /// Like `Iterator::filter_map`, but over a fallible iterator of `Result`s. |
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590 /// |
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591 /// The callback is only called for incoming `Ok` values. Errors are passed |
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592 /// through as-is. In order to let it use the `?` operator the callback is |
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593 /// expected to return a `Result` of `Option`, instead of an `Option` of |
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594 /// `Result`. |
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595 fn filter_map_results<'a, I, F, A, B, E>( |
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596 iter: I, |
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597 f: F, |
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598 ) -> impl Iterator<Item = Result<B, E>> + 'a |
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599 where |
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600 I: Iterator<Item = Result<A, E>> + 'a, |
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601 F: Fn(A) -> Result<Option<B>, E> + 'a, |
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602 { |
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603 iter.filter_map(move |result| match result { |
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604 Ok(node) => f(node).transpose(), |
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605 Err(e) => Some(Err(e)), |
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606 }) |
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607 } |
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608 |
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609 impl<'on_disk> super::dispatch::DirstateMapMethods for DirstateMap<'on_disk> { |
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610 fn clear(&mut self) { |
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611 self.root = Default::default(); |
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612 self.nodes_with_entry_count = 0; |
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613 self.nodes_with_copy_source_count = 0; |
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614 } |
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615 |
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616 fn add_file( |
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617 &mut self, |
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618 filename: &HgPath, |
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619 old_state: EntryState, |
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620 entry: DirstateEntry, |
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621 ) -> Result<(), DirstateError> { |
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622 Ok(self.add_or_remove_file(filename, old_state, entry)?) |
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623 } |
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624 |
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625 fn remove_file( |
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626 &mut self, |
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627 filename: &HgPath, |
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628 old_state: EntryState, |
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629 size: i32, |
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630 ) -> Result<(), DirstateError> { |
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631 let entry = DirstateEntry { |
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632 state: EntryState::Removed, |
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633 mode: 0, |
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634 size, |
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635 mtime: 0, |
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636 }; |
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637 Ok(self.add_or_remove_file(filename, old_state, entry)?) |
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638 } |
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639 |
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640 fn drop_file( |
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641 &mut self, |
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642 filename: &HgPath, |
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643 old_state: EntryState, |
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644 ) -> Result<bool, DirstateError> { |
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645 struct Dropped { |
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646 was_tracked: bool, |
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647 had_entry: bool, |
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648 had_copy_source: bool, |
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649 } |
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650 fn recur<'on_disk>( |
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651 on_disk: &'on_disk [u8], |
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652 nodes: &mut ChildNodes<'on_disk>, |
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653 path: &HgPath, |
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654 ) -> Result<Option<Dropped>, DirstateV2ParseError> { |
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655 let (first_path_component, rest_of_path) = |
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656 path.split_first_component(); |
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657 let node = if let Some(node) = |
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658 nodes.make_mut(on_disk)?.get_mut(first_path_component) |
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659 { |
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660 node |
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661 } else { |
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662 return Ok(None); |
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663 }; |
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664 let dropped; |
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665 if let Some(rest) = rest_of_path { |
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666 if let Some(d) = recur(on_disk, &mut node.children, rest)? { |
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667 dropped = d; |
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668 if dropped.was_tracked { |
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669 node.tracked_descendants_count -= 1; |
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670 } |
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671 } else { |
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672 return Ok(None); |
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673 } |
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674 } else { |
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675 dropped = Dropped { |
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676 was_tracked: node |
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677 .entry |
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678 .as_ref() |
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679 .map_or(false, |entry| entry.state.is_tracked()), |
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680 had_entry: node.entry.take().is_some(), |
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681 had_copy_source: node.copy_source.take().is_some(), |
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682 }; |
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683 } |
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684 // After recursion, for both leaf (rest_of_path is None) nodes and |
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685 // parent nodes, remove a node if it just became empty. |
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686 if node.entry.is_none() |
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687 && node.copy_source.is_none() |
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688 && node.children.is_empty() |
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689 { |
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690 nodes.make_mut(on_disk)?.remove(first_path_component); |
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691 } |
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692 Ok(Some(dropped)) |
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693 } |
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694 |
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695 if let Some(dropped) = recur(self.on_disk, &mut self.root, filename)? { |
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696 if dropped.had_entry { |
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697 self.nodes_with_entry_count -= 1 |
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698 } |
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699 if dropped.had_copy_source { |
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700 self.nodes_with_copy_source_count -= 1 |
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701 } |
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702 Ok(dropped.had_entry) |
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703 } else { |
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704 debug_assert!(!old_state.is_tracked()); |
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705 Ok(false) |
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706 } |
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707 } |
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708 |
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709 fn clear_ambiguous_times( |
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710 &mut self, |
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711 filenames: Vec<HgPathBuf>, |
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712 now: i32, |
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713 ) -> Result<(), DirstateV2ParseError> { |
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714 for filename in filenames { |
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715 if let Some(node) = |
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716 Self::get_node_mut(self.on_disk, &mut self.root, &filename)? |
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717 { |
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718 if let Some(entry) = node.entry.as_mut() { |
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|
719 entry.clear_ambiguous_mtime(now); |
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720 } |
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721 } |
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722 } |
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723 Ok(()) |
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724 } |
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725 |
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726 fn non_normal_entries_contains( |
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727 &mut self, |
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728 key: &HgPath, |
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729 ) -> Result<bool, DirstateV2ParseError> { |
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730 Ok(if let Some(node) = self.get_node(key)? { |
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731 node.entry()?.map_or(false, |entry| entry.is_non_normal()) |
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732 } else { |
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733 false |
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734 }) |
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735 } |
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736 |
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737 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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738 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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739 // entries" set that need to be kept up to date |
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740 } |
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741 |
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742 fn non_normal_or_other_parent_paths( |
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743 &mut self, |
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744 ) -> Box<dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + '_> |
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745 { |
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746 Box::new(self.filter_full_paths(|entry| { |
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747 entry.is_non_normal() || entry.is_from_other_parent() |
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748 })) |
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749 } |
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750 |
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751 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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752 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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753 // entries" and "from other parent" sets that need to be recomputed |
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754 } |
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755 |
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756 fn iter_non_normal_paths( |
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757 &mut self, |
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758 ) -> Box< |
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759 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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760 > { |
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761 self.iter_non_normal_paths_panic() |
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762 } |
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763 |
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764 fn iter_non_normal_paths_panic( |
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|
765 &self, |
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766 ) -> Box< |
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767 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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768 > { |
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|
769 Box::new(self.filter_full_paths(|entry| entry.is_non_normal())) |
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770 } |
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|
771 |
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772 fn iter_other_parent_paths( |
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773 &mut self, |
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774 ) -> Box< |
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|
775 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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|
776 > { |
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|
777 Box::new(self.filter_full_paths(|entry| entry.is_from_other_parent())) |
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778 } |
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|
779 |
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|
780 fn has_tracked_dir( |
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781 &mut self, |
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|
782 directory: &HgPath, |
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783 ) -> Result<bool, DirstateError> { |
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784 if let Some(node) = self.get_node(directory)? { |
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785 // A node without a `DirstateEntry` was created to hold child |
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|
786 // nodes, and is therefore a directory. |
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|
787 Ok(!node.has_entry() && node.tracked_descendants_count() > 0) |
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788 } else { |
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|
789 Ok(false) |
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790 } |
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791 } |
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|
792 |
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|
793 fn has_dir(&mut self, directory: &HgPath) -> Result<bool, DirstateError> { |
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794 if let Some(node) = self.get_node(directory)? { |
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795 // A node without a `DirstateEntry` was created to hold child |
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796 // nodes, and is therefore a directory. |
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797 Ok(!node.has_entry()) |
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798 } else { |
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799 Ok(false) |
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800 } |
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801 } |
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802 |
47280
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|
803 #[timed] |
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|
804 fn pack_v1( |
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805 &mut self, |
47102
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|
806 parents: DirstateParents, |
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|
807 now: Timestamp, |
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808 ) -> Result<Vec<u8>, DirstateError> { |
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809 let now: i32 = now.0.try_into().expect("time overflow"); |
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810 let mut ambiguous_mtimes = Vec::new(); |
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811 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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812 // reallocations |
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813 let mut size = parents.as_bytes().len(); |
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814 for node in self.iter_nodes() { |
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815 let node = node?; |
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816 if let Some(entry) = node.entry()? { |
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817 size += packed_entry_size( |
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818 node.full_path(self.on_disk)?, |
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819 node.copy_source(self.on_disk)?, |
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820 ); |
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821 if entry.mtime_is_ambiguous(now) { |
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822 ambiguous_mtimes.push(node.full_path_cow(self.on_disk)?) |
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823 } |
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824 } |
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825 } |
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826 self.clear_known_ambiguous_mtimes(&ambiguous_mtimes)?; |
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827 |
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828 let mut packed = Vec::with_capacity(size); |
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829 packed.extend(parents.as_bytes()); |
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830 |
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831 for node in self.iter_nodes() { |
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832 let node = node?; |
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833 if let Some(entry) = node.entry()? { |
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834 pack_entry( |
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835 node.full_path(self.on_disk)?, |
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836 &entry, |
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837 node.copy_source(self.on_disk)?, |
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838 &mut packed, |
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839 ); |
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840 } |
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841 } |
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842 Ok(packed) |
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843 } |
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844 |
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845 #[timed] |
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846 fn pack_v2( |
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847 &mut self, |
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848 parents: DirstateParents, |
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849 now: Timestamp, |
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850 ) -> Result<Vec<u8>, DirstateError> { |
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851 // TODO: how do we want to handle this in 2038? |
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852 let now: i32 = now.0.try_into().expect("time overflow"); |
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853 let mut paths = Vec::new(); |
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854 for node in self.iter_nodes() { |
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855 let node = node?; |
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856 if let Some(entry) = node.entry()? { |
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857 if entry.mtime_is_ambiguous(now) { |
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858 paths.push(node.full_path_cow(self.on_disk)?) |
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859 } |
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860 } |
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861 } |
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862 // Borrow of `self` ends here since we collect cloned paths |
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863 |
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864 self.clear_known_ambiguous_mtimes(&paths)?; |
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865 |
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866 on_disk::write(self, parents) |
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867 } |
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868 |
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869 fn set_all_dirs(&mut self) -> Result<(), DirstateError> { |
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870 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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871 // needs to be recomputed |
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872 Ok(()) |
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873 } |
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874 |
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875 fn set_dirs(&mut self) -> Result<(), DirstateError> { |
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876 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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877 // to be recomputed |
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878 Ok(()) |
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879 } |
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880 |
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|
881 fn status<'a>( |
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882 &'a mut self, |
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883 matcher: &'a (dyn Matcher + Sync), |
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884 root_dir: PathBuf, |
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885 ignore_files: Vec<PathBuf>, |
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886 options: StatusOptions, |
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887 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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888 { |
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889 super::status::status(self, matcher, root_dir, ignore_files, options) |
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890 } |
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891 |
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892 fn copy_map_len(&self) -> usize { |
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893 self.nodes_with_copy_source_count as usize |
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894 } |
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895 |
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896 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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897 Box::new(filter_map_results(self.iter_nodes(), move |node| { |
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898 Ok(if let Some(source) = node.copy_source(self.on_disk)? { |
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899 Some((node.full_path(self.on_disk)?, source)) |
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900 } else { |
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901 None |
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902 }) |
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|
903 })) |
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904 } |
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905 |
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906 fn copy_map_contains_key( |
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907 &self, |
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908 key: &HgPath, |
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909 ) -> Result<bool, DirstateV2ParseError> { |
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910 Ok(if let Some(node) = self.get_node(key)? { |
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911 node.has_copy_source() |
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912 } else { |
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913 false |
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914 }) |
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915 } |
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916 |
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917 fn copy_map_get( |
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918 &self, |
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919 key: &HgPath, |
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920 ) -> Result<Option<&HgPath>, DirstateV2ParseError> { |
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921 if let Some(node) = self.get_node(key)? { |
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922 if let Some(source) = node.copy_source(self.on_disk)? { |
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923 return Ok(Some(source)); |
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924 } |
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925 } |
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926 Ok(None) |
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927 } |
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928 |
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929 fn copy_map_remove( |
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930 &mut self, |
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931 key: &HgPath, |
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932 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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933 let count = &mut self.nodes_with_copy_source_count; |
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934 Ok( |
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935 Self::get_node_mut(self.on_disk, &mut self.root, key)?.and_then( |
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936 |node| { |
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937 if node.copy_source.is_some() { |
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938 *count -= 1 |
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939 } |
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940 node.copy_source.take().map(Cow::into_owned) |
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941 }, |
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942 ), |
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943 ) |
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944 } |
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945 |
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946 fn copy_map_insert( |
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947 &mut self, |
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948 key: HgPathBuf, |
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949 value: HgPathBuf, |
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950 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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951 let node = Self::get_or_insert_node( |
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952 self.on_disk, |
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953 &mut self.root, |
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954 &key, |
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955 WithBasename::to_cow_owned, |
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956 |_ancestor| {}, |
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957 )?; |
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958 if node.copy_source.is_none() { |
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959 self.nodes_with_copy_source_count += 1 |
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960 } |
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961 Ok(node.copy_source.replace(value.into()).map(Cow::into_owned)) |
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962 } |
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963 |
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964 fn len(&self) -> usize { |
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965 self.nodes_with_entry_count as usize |
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966 } |
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967 |
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968 fn contains_key( |
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969 &self, |
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970 key: &HgPath, |
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971 ) -> Result<bool, DirstateV2ParseError> { |
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972 Ok(self.get(key)?.is_some()) |
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973 } |
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974 |
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975 fn get( |
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976 &self, |
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977 key: &HgPath, |
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978 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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979 Ok(if let Some(node) = self.get_node(key)? { |
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980 node.entry()? |
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981 } else { |
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982 None |
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983 }) |
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984 } |
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985 |
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986 fn iter(&self) -> StateMapIter<'_> { |
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987 Box::new(filter_map_results(self.iter_nodes(), move |node| { |
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988 Ok(if let Some(entry) = node.entry()? { |
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989 Some((node.full_path(self.on_disk)?, entry)) |
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990 } else { |
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991 None |
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992 }) |
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993 })) |
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994 } |
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995 } |