Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47280:1766130fe9ba
dirstate-v2: Change the on-disk format when the requirement is enabled
For now, the format is the same except with an additional marker at the start.
This marker is redundant: for existing repositories it is `.hg/requires` that
determines which format to use. For new repositories, it is the new
`format.exp-dirstate-v2` config. There is no upgrade or downgrade so far.
Most of the changes are about plumbing a boolean through layers of APIs to
indicate which format should be used.
Differential Revision: https://phab.mercurial-scm.org/D10719
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 19 May 2021 13:15:00 +0200 |
parents | 47ccab19bf9f |
children | ce41ee53263f |
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::V2_FORMAT_MARKER; |
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8 use super::path_with_basename::WithBasename; |
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9 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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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::errors::HgError; |
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15 use crate::matchers::Matcher; |
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16 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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17 use crate::utils::SliceExt; |
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18 use crate::CopyMapIter; |
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19 use crate::DirstateEntry; |
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20 use crate::DirstateError; |
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21 use crate::DirstateMapError; |
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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::StateMapIter; |
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28 use crate::StatusError; |
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29 use crate::StatusOptions; |
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30 |
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31 pub struct DirstateMap<'on_disk> { |
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32 /// Contents of the `.hg/dirstate` file |
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33 on_disk: &'on_disk [u8], |
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34 |
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35 pub(super) root: ChildNodes<'on_disk>, |
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36 |
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37 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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38 nodes_with_entry_count: usize, |
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39 |
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40 /// Number of nodes anywhere in the tree that have |
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41 /// `.copy_source.is_some()`. |
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42 nodes_with_copy_source_count: usize, |
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43 } |
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44 |
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45 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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46 /// map key would also work: all paths in a given map have the same parent |
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47 /// path, so comparing full paths gives the same result as comparing base |
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48 /// names. However `BTreeMap` would waste time always re-comparing the same |
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49 /// string prefix. |
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50 pub(super) type ChildNodes<'on_disk> = |
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51 FastHashMap<WithBasename<Cow<'on_disk, HgPath>>, Node<'on_disk>>; |
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52 |
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53 /// Represents a file or a directory |
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54 #[derive(Default)] |
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55 pub(super) struct Node<'on_disk> { |
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56 /// `None` for directories |
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57 pub(super) entry: Option<DirstateEntry>, |
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58 |
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59 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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60 |
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61 pub(super) children: ChildNodes<'on_disk>, |
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62 |
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63 /// How many (non-inclusive) descendants of this node are tracked files |
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64 tracked_descendants_count: usize, |
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65 } |
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66 |
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67 impl Node<'_> { |
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68 pub(super) fn state(&self) -> Option<EntryState> { |
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69 self.entry.as_ref().map(|entry| entry.state) |
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70 } |
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71 } |
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72 |
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73 /// `(full_path, entry, copy_source)` |
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74 type NodeDataMut<'tree, 'on_disk> = ( |
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75 &'tree HgPath, |
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76 &'tree mut Option<DirstateEntry>, |
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77 &'tree mut Option<Cow<'on_disk, HgPath>>, |
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78 ); |
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79 |
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80 impl<'on_disk> DirstateMap<'on_disk> { |
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81 #[timed] |
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82 pub fn new_v2( |
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83 on_disk: &'on_disk [u8], |
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84 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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85 if let Some(rest) = on_disk.drop_prefix(V2_FORMAT_MARKER) { |
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86 Self::new_v1(rest) |
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87 } else if on_disk.is_empty() { |
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88 Self::new_v1(on_disk) |
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89 } else { |
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90 return Err(HgError::corrupted( |
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91 "missing dirstate-v2 magic number", |
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92 ) |
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93 .into()); |
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94 } |
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95 } |
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96 |
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97 #[timed] |
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98 pub fn new_v1( |
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99 on_disk: &'on_disk [u8], |
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100 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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101 let mut map = Self { |
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102 on_disk, |
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103 root: ChildNodes::default(), |
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104 nodes_with_entry_count: 0, |
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105 nodes_with_copy_source_count: 0, |
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106 }; |
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107 if map.on_disk.is_empty() { |
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108 return Ok((map, None)); |
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109 } |
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110 |
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111 let parents = parse_dirstate_entries( |
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112 map.on_disk, |
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113 |path, entry, copy_source| { |
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114 let tracked = entry.state.is_tracked(); |
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115 let node = Self::get_or_insert_node( |
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116 &mut map.root, |
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117 path, |
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118 WithBasename::to_cow_borrowed, |
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119 |ancestor| { |
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120 if tracked { |
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121 ancestor.tracked_descendants_count += 1 |
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122 } |
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123 }, |
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124 ); |
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125 assert!( |
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126 node.entry.is_none(), |
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127 "duplicate dirstate entry in read" |
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128 ); |
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129 assert!( |
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130 node.copy_source.is_none(), |
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131 "duplicate dirstate entry in read" |
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132 ); |
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133 node.entry = Some(*entry); |
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134 node.copy_source = copy_source.map(Cow::Borrowed); |
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135 map.nodes_with_entry_count += 1; |
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136 if copy_source.is_some() { |
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137 map.nodes_with_copy_source_count += 1 |
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138 } |
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139 }, |
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140 )?; |
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141 let parents = Some(parents.clone()); |
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142 |
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143 Ok((map, parents)) |
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144 } |
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145 |
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146 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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147 let mut children = &self.root; |
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148 let mut components = path.components(); |
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149 let mut component = |
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150 components.next().expect("expected at least one components"); |
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151 loop { |
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152 let child = children.get(component)?; |
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153 if let Some(next_component) = components.next() { |
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154 component = next_component; |
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155 children = &child.children; |
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156 } else { |
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157 return Some(child); |
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158 } |
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159 } |
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160 } |
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161 |
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162 /// Returns a mutable reference to the node at `path` if it exists |
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163 /// |
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164 /// This takes `root` instead of `&mut self` so that callers can mutate |
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165 /// other fields while the returned borrow is still valid |
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166 fn get_node_mut<'tree>( |
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167 root: &'tree mut ChildNodes<'on_disk>, |
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168 path: &HgPath, |
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169 ) -> Option<&'tree mut Node<'on_disk>> { |
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170 let mut children = root; |
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171 let mut components = path.components(); |
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172 let mut component = |
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173 components.next().expect("expected at least one components"); |
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174 loop { |
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175 let child = children.get_mut(component)?; |
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176 if let Some(next_component) = components.next() { |
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177 component = next_component; |
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178 children = &mut child.children; |
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179 } else { |
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180 return Some(child); |
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181 } |
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182 } |
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183 } |
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184 |
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185 fn get_or_insert_node<'tree, 'path>( |
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186 root: &'tree mut ChildNodes<'on_disk>, |
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187 path: &'path HgPath, |
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188 to_cow: impl Fn( |
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189 WithBasename<&'path HgPath>, |
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190 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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191 mut each_ancestor: impl FnMut(&mut Node), |
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192 ) -> &'tree mut Node<'on_disk> { |
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193 let mut child_nodes = root; |
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194 let mut inclusive_ancestor_paths = |
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195 WithBasename::inclusive_ancestors_of(path); |
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196 let mut ancestor_path = inclusive_ancestor_paths |
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197 .next() |
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198 .expect("expected at least one inclusive ancestor"); |
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199 loop { |
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200 // TODO: can we avoid allocating an owned key in cases where the |
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201 // map already contains that key, without introducing double |
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202 // lookup? |
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203 let child_node = |
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204 child_nodes.entry(to_cow(ancestor_path)).or_default(); |
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205 if let Some(next) = inclusive_ancestor_paths.next() { |
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206 each_ancestor(child_node); |
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207 ancestor_path = next; |
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208 child_nodes = &mut child_node.children; |
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209 } else { |
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210 return child_node; |
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211 } |
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212 } |
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213 } |
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214 |
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215 fn add_or_remove_file( |
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216 &mut self, |
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217 path: &HgPath, |
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218 old_state: EntryState, |
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219 new_entry: DirstateEntry, |
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220 ) { |
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221 let tracked_count_increment = |
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222 match (old_state.is_tracked(), new_entry.state.is_tracked()) { |
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223 (false, true) => 1, |
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224 (true, false) => -1, |
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225 _ => 0, |
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226 }; |
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227 |
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228 let node = Self::get_or_insert_node( |
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229 &mut self.root, |
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230 path, |
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231 WithBasename::to_cow_owned, |
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232 |ancestor| { |
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233 // We can’t use `+= increment` because the counter is unsigned, |
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234 // and we want debug builds to detect accidental underflow |
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235 // through zero |
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236 match tracked_count_increment { |
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237 1 => ancestor.tracked_descendants_count += 1, |
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238 -1 => ancestor.tracked_descendants_count -= 1, |
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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 if node.entry.is_none() { |
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244 self.nodes_with_entry_count += 1 |
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245 } |
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246 node.entry = Some(new_entry) |
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247 } |
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248 |
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249 fn iter_nodes<'a>( |
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250 &'a self, |
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251 ) -> impl Iterator<Item = (&'a HgPath, &'a Node)> + 'a { |
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252 // Depth first tree traversal. |
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253 // |
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254 // If we could afford internal iteration and recursion, |
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255 // this would look like: |
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256 // |
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257 // ``` |
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258 // fn traverse_children( |
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259 // children: &ChildNodes, |
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260 // each: &mut impl FnMut(&Node), |
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261 // ) { |
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262 // for child in children.values() { |
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263 // traverse_children(&child.children, each); |
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264 // each(child); |
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265 // } |
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266 // } |
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267 // ``` |
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268 // |
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269 // However we want an external iterator and therefore can’t use the |
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270 // call stack. Use an explicit stack instead: |
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271 let mut stack = Vec::new(); |
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272 let mut iter = self.root.iter(); |
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273 std::iter::from_fn(move || { |
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274 while let Some((key, child_node)) = iter.next() { |
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275 // Pseudo-recursion |
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276 let new_iter = child_node.children.iter(); |
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277 let old_iter = std::mem::replace(&mut iter, new_iter); |
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278 let key = &**key.full_path(); |
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279 stack.push((key, child_node, old_iter)); |
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280 } |
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281 // Found the end of a `children.iter()` iterator. |
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282 if let Some((key, child_node, next_iter)) = stack.pop() { |
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283 // "Return" from pseudo-recursion by restoring state from the |
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284 // explicit stack |
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285 iter = next_iter; |
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286 |
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287 Some((key, child_node)) |
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288 } else { |
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289 // Reached the bottom of the stack, we’re done |
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290 None |
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291 } |
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292 }) |
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293 } |
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294 |
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295 /// Mutable iterator for the `(entry, copy source)` of each node. |
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296 /// |
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297 /// It would not be safe to yield mutable references to nodes themeselves |
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298 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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299 /// reachable from their ancestor nodes, potentially creating multiple |
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300 /// `&mut` references to a given node. |
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301 fn iter_node_data_mut<'tree>( |
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302 &'tree mut self, |
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303 ) -> impl Iterator<Item = NodeDataMut<'tree, 'on_disk>> + 'tree { |
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304 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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305 let mut stack = Vec::new(); |
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306 let mut iter = self.root.iter_mut(); |
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307 std::iter::from_fn(move || { |
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308 while let Some((key, child_node)) = iter.next() { |
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309 // Pseudo-recursion |
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310 let data = ( |
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311 &**key.full_path(), |
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312 &mut child_node.entry, |
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313 &mut child_node.copy_source, |
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314 ); |
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315 let new_iter = child_node.children.iter_mut(); |
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316 let old_iter = std::mem::replace(&mut iter, new_iter); |
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317 stack.push((data, old_iter)); |
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318 } |
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319 // Found the end of a `children.values_mut()` iterator. |
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320 if let Some((data, next_iter)) = stack.pop() { |
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321 // "Return" from pseudo-recursion by restoring state from the |
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322 // explicit stack |
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323 iter = next_iter; |
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324 |
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325 Some(data) |
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326 } else { |
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327 // Reached the bottom of the stack, we’re done |
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328 None |
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329 } |
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330 }) |
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331 } |
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332 } |
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333 |
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334 impl<'on_disk> super::dispatch::DirstateMapMethods for DirstateMap<'on_disk> { |
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335 fn clear(&mut self) { |
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336 self.root.clear(); |
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337 self.nodes_with_entry_count = 0; |
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338 self.nodes_with_copy_source_count = 0; |
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339 } |
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340 |
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341 fn add_file( |
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342 &mut self, |
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343 filename: &HgPath, |
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344 old_state: EntryState, |
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345 entry: DirstateEntry, |
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346 ) -> Result<(), DirstateMapError> { |
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347 self.add_or_remove_file(filename, old_state, entry); |
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348 Ok(()) |
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349 } |
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350 |
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351 fn remove_file( |
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352 &mut self, |
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353 filename: &HgPath, |
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354 old_state: EntryState, |
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355 size: i32, |
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356 ) -> Result<(), DirstateMapError> { |
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357 let entry = DirstateEntry { |
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358 state: EntryState::Removed, |
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359 mode: 0, |
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360 size, |
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361 mtime: 0, |
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362 }; |
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363 self.add_or_remove_file(filename, old_state, entry); |
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364 Ok(()) |
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365 } |
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366 |
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367 fn drop_file( |
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368 &mut self, |
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369 filename: &HgPath, |
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370 old_state: EntryState, |
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371 ) -> Result<bool, DirstateMapError> { |
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372 struct Dropped { |
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373 was_tracked: bool, |
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374 had_entry: bool, |
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375 had_copy_source: bool, |
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376 } |
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377 fn recur(nodes: &mut ChildNodes, path: &HgPath) -> Option<Dropped> { |
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378 let (first_path_component, rest_of_path) = |
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379 path.split_first_component(); |
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380 let node = nodes.get_mut(first_path_component)?; |
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381 let dropped; |
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382 if let Some(rest) = rest_of_path { |
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383 dropped = recur(&mut node.children, rest)?; |
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384 if dropped.was_tracked { |
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385 node.tracked_descendants_count -= 1; |
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386 } |
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387 } else { |
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388 dropped = Dropped { |
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389 was_tracked: node |
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390 .entry |
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391 .as_ref() |
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392 .map_or(false, |entry| entry.state.is_tracked()), |
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393 had_entry: node.entry.take().is_some(), |
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394 had_copy_source: node.copy_source.take().is_some(), |
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395 }; |
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396 } |
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397 // After recursion, for both leaf (rest_of_path is None) nodes and |
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398 // parent nodes, remove a node if it just became empty. |
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399 if node.entry.is_none() |
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400 && node.copy_source.is_none() |
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401 && node.children.is_empty() |
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402 { |
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403 nodes.remove(first_path_component); |
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404 } |
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405 Some(dropped) |
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406 } |
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407 |
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408 if let Some(dropped) = recur(&mut self.root, filename) { |
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409 if dropped.had_entry { |
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410 self.nodes_with_entry_count -= 1 |
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411 } |
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412 if dropped.had_copy_source { |
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413 self.nodes_with_copy_source_count -= 1 |
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414 } |
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415 Ok(dropped.had_entry) |
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416 } else { |
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417 debug_assert!(!old_state.is_tracked()); |
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418 Ok(false) |
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419 } |
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420 } |
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421 |
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422 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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423 for filename in filenames { |
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424 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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425 if let Some(entry) = node.entry.as_mut() { |
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426 clear_ambiguous_mtime(entry, now); |
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427 } |
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428 } |
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429 } |
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430 } |
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431 |
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432 fn non_normal_entries_contains(&mut self, key: &HgPath) -> bool { |
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433 self.get_node(key) |
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434 .and_then(|node| node.entry.as_ref()) |
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435 .map_or(false, DirstateEntry::is_non_normal) |
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436 } |
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437 |
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438 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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439 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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440 // entries" set that need to be kept up to date |
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441 } |
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442 |
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443 fn non_normal_or_other_parent_paths( |
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444 &mut self, |
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445 ) -> Box<dyn Iterator<Item = &HgPath> + '_> { |
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446 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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447 node.entry |
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448 .as_ref() |
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449 .filter(|entry| { |
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450 entry.is_non_normal() || entry.is_from_other_parent() |
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451 }) |
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452 .map(|_| path) |
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453 })) |
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454 } |
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455 |
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456 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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457 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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458 // entries" and "from other parent" sets that need to be recomputed |
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459 } |
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460 |
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461 fn iter_non_normal_paths( |
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462 &mut self, |
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463 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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464 self.iter_non_normal_paths_panic() |
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465 } |
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466 |
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467 fn iter_non_normal_paths_panic( |
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468 &self, |
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469 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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470 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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471 node.entry |
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472 .as_ref() |
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473 .filter(|entry| entry.is_non_normal()) |
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474 .map(|_| path) |
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475 })) |
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476 } |
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477 |
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478 fn iter_other_parent_paths( |
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479 &mut self, |
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480 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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481 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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482 node.entry |
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483 .as_ref() |
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484 .filter(|entry| entry.is_from_other_parent()) |
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485 .map(|_| path) |
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486 })) |
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487 } |
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488 |
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489 fn has_tracked_dir( |
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490 &mut self, |
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491 directory: &HgPath, |
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492 ) -> Result<bool, DirstateMapError> { |
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493 if let Some(node) = self.get_node(directory) { |
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494 // A node without a `DirstateEntry` was created to hold child |
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495 // nodes, and is therefore a directory. |
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496 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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497 } else { |
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498 Ok(false) |
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499 } |
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500 } |
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501 |
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502 fn has_dir( |
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503 &mut self, |
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504 directory: &HgPath, |
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505 ) -> Result<bool, DirstateMapError> { |
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506 if let Some(node) = self.get_node(directory) { |
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507 // A node without a `DirstateEntry` was created to hold child |
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508 // nodes, and is therefore a directory. |
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509 Ok(node.entry.is_none()) |
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510 } else { |
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511 Ok(false) |
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512 } |
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513 } |
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514 |
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515 #[timed] |
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516 fn pack_v1( |
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517 &mut self, |
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518 parents: DirstateParents, |
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519 now: Timestamp, |
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520 ) -> Result<Vec<u8>, DirstateError> { |
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521 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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522 // reallocations |
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523 let mut size = parents.as_bytes().len(); |
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524 for (path, node) in self.iter_nodes() { |
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525 if node.entry.is_some() { |
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526 size += packed_entry_size( |
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527 path, |
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528 node.copy_source.as_ref().map(|p| &**p), |
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529 ) |
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530 } |
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531 } |
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532 |
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533 let mut packed = Vec::with_capacity(size); |
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534 packed.extend(parents.as_bytes()); |
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535 |
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536 let now: i32 = now.0.try_into().expect("time overflow"); |
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537 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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538 if let Some(entry) = opt_entry { |
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539 clear_ambiguous_mtime(entry, now); |
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540 pack_entry( |
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541 path, |
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542 entry, |
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543 copy_source.as_ref().map(|p| &**p), |
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544 &mut packed, |
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545 ); |
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546 } |
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547 } |
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548 Ok(packed) |
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549 } |
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550 |
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551 #[timed] |
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552 fn pack_v2( |
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553 &mut self, |
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554 parents: DirstateParents, |
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555 now: Timestamp, |
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556 ) -> Result<Vec<u8>, DirstateError> { |
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557 // Inefficient but temporary |
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558 let mut v2 = V2_FORMAT_MARKER.to_vec(); |
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559 v2.append(&mut self.pack_v1(parents, now)?); |
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560 Ok(v2) |
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561 } |
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562 |
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563 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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564 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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565 // needs to be recomputed |
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566 Ok(()) |
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567 } |
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568 |
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569 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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570 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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571 // to be recomputed |
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572 Ok(()) |
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573 } |
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574 |
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575 fn status<'a>( |
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576 &'a mut self, |
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577 matcher: &'a (dyn Matcher + Sync), |
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578 root_dir: PathBuf, |
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579 ignore_files: Vec<PathBuf>, |
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580 options: StatusOptions, |
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581 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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582 { |
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583 super::status::status(self, matcher, root_dir, ignore_files, options) |
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584 } |
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585 |
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586 fn copy_map_len(&self) -> usize { |
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587 self.nodes_with_copy_source_count |
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588 } |
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589 |
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590 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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591 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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592 node.copy_source |
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593 .as_ref() |
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594 .map(|copy_source| (path, &**copy_source)) |
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595 })) |
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596 } |
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597 |
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598 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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599 if let Some(node) = self.get_node(key) { |
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600 node.copy_source.is_some() |
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601 } else { |
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602 false |
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603 } |
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604 } |
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605 |
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606 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPath> { |
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607 self.get_node(key)?.copy_source.as_ref().map(|p| &**p) |
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608 } |
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609 |
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610 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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611 let count = &mut self.nodes_with_copy_source_count; |
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612 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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613 if node.copy_source.is_some() { |
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614 *count -= 1 |
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615 } |
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616 node.copy_source.take().map(Cow::into_owned) |
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617 }) |
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618 } |
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619 |
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620 fn copy_map_insert( |
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621 &mut self, |
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622 key: HgPathBuf, |
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623 value: HgPathBuf, |
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624 ) -> Option<HgPathBuf> { |
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625 let node = Self::get_or_insert_node( |
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626 &mut self.root, |
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627 &key, |
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628 WithBasename::to_cow_owned, |
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629 |_ancestor| {}, |
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630 ); |
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631 if node.copy_source.is_none() { |
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632 self.nodes_with_copy_source_count += 1 |
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633 } |
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634 node.copy_source.replace(value.into()).map(Cow::into_owned) |
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635 } |
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636 |
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637 fn len(&self) -> usize { |
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638 self.nodes_with_entry_count |
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639 } |
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640 |
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641 fn contains_key(&self, key: &HgPath) -> bool { |
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642 self.get(key).is_some() |
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643 } |
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644 |
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645 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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646 self.get_node(key)?.entry.as_ref() |
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647 } |
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648 |
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649 fn iter(&self) -> StateMapIter<'_> { |
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650 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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651 node.entry.as_ref().map(|entry| (path, entry)) |
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652 })) |
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653 } |
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654 } |