Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 47351:3b9914b28133
dirstate-v2: Add --dirs to debugdirstate command
`hg debugdirstate --dirs` also shows information stored in the dirstate
(for `read_dir` caching) about directories.
Differential Revision: https://phab.mercurial-scm.org/D10828
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 31 May 2021 19:54:41 +0200 |
parents | 7138c863d0a1 |
children | bd88b6bfd8da |
rev | line source |
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1 //! The "version 2" disk representation of the dirstate |
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2 //! |
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3 //! # File format |
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4 //! |
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5 //! The file starts with a fixed-sized header, whose layout is defined by the |
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6 //! `Header` struct. Its `root` field contains the slice (offset and length) to |
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7 //! the nodes representing the files and directories at the root of the |
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8 //! repository. Each node is also fixed-size, defined by the `Node` struct. |
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9 //! Nodes in turn contain slices to variable-size paths, and to their own child |
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10 //! nodes (if any) for nested files and directories. |
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11 |
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12 use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef}; |
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13 use crate::dirstate_tree::path_with_basename::WithBasename; |
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14 use crate::errors::HgError; |
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15 use crate::utils::hg_path::HgPath; |
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16 use crate::DirstateEntry; |
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17 use crate::DirstateError; |
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18 use crate::DirstateParents; |
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19 use crate::EntryState; |
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20 use bytes_cast::unaligned::{I32Be, I64Be, U32Be, U64Be}; |
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21 use bytes_cast::BytesCast; |
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22 use std::borrow::Cow; |
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23 use std::convert::TryFrom; |
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24 use std::time::{Duration, SystemTime, UNIX_EPOCH}; |
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25 |
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26 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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27 /// This a redundant sanity check more than an actual "magic number" since |
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28 /// `.hg/requires` already governs which format should be used. |
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29 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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30 |
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31 #[derive(BytesCast)] |
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32 #[repr(C)] |
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33 struct Header { |
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34 marker: [u8; V2_FORMAT_MARKER.len()], |
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35 |
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36 /// `dirstatemap.parents()` in `mercurial/dirstate.py` relies on this |
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37 /// `parents` field being at this offset, immediately after `marker`. |
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38 parents: DirstateParents, |
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39 |
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40 root: ChildNodes, |
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41 nodes_with_entry_count: Size, |
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42 nodes_with_copy_source_count: Size, |
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43 } |
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44 |
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45 #[derive(BytesCast)] |
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46 #[repr(C)] |
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47 pub(super) struct Node { |
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48 full_path: PathSlice, |
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49 |
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50 /// In bytes from `self.full_path.start` |
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51 base_name_start: Size, |
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52 |
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53 copy_source: OptPathSlice, |
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54 children: ChildNodes, |
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55 pub(super) tracked_descendants_count: Size, |
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56 |
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57 /// Dependending on the value of `state`: |
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58 /// |
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59 /// * A null byte: `data` is not used. |
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60 /// |
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61 /// * A `n`, `a`, `r`, or `m` ASCII byte: `state` and `data` together |
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62 /// represent a dirstate entry like in the v1 format. |
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63 /// |
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64 /// * A `d` ASCII byte: the bytes of `data` should instead be interpreted |
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65 /// as the `Timestamp` for the mtime of a cached directory. |
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66 /// |
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67 /// The presence of this state means that at some point, this path in |
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68 /// the working directory was observed: |
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69 /// |
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70 /// - To be a directory |
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71 /// - With the modification time as given by `Timestamp` |
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72 /// - That timestamp was already strictly in the past when observed, |
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73 /// meaning that later changes cannot happen in the same clock tick |
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74 /// and must cause a different modification time (unless the system |
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75 /// clock jumps back and we get unlucky, which is not impossible but |
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76 /// but deemed unlikely enough). |
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77 /// - The directory did not contain any child entry that did not have a |
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78 /// corresponding dirstate node. |
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79 /// |
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80 /// This means that if `std::fs::symlink_metadata` later reports the |
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81 /// same modification time, we don’t need to call `std::fs::read_dir` |
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82 /// again for this directory and can iterate child dirstate nodes |
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83 /// instead. |
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84 state: u8, |
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85 data: Entry, |
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86 } |
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87 |
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88 #[derive(BytesCast, Copy, Clone)] |
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89 #[repr(C)] |
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90 struct Entry { |
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91 mode: I32Be, |
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92 mtime: I32Be, |
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93 size: I32Be, |
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94 } |
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95 |
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96 /// Duration since the Unix epoch |
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97 #[derive(BytesCast, Copy, Clone, PartialEq)] |
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98 #[repr(C)] |
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99 pub(super) struct Timestamp { |
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100 seconds: I64Be, |
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101 |
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102 /// In `0 .. 1_000_000_000`. |
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103 /// |
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104 /// This timestamp is later or earlier than `(seconds, 0)` by this many |
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105 /// nanoseconds, if `seconds` is non-negative or negative, respectively. |
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106 nanoseconds: U32Be, |
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107 } |
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108 |
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109 /// Counted in bytes from the start of the file |
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110 /// |
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111 /// NOTE: If we decide to never support `.hg/dirstate` files larger than 4 GiB |
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112 /// we could save space by using `U32Be` instead. |
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113 type Offset = U64Be; |
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114 |
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115 /// Counted in number of items |
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116 /// |
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117 /// NOTE: not supporting directories with more than 4 billion direct children, |
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118 /// or filenames more than 4 GiB. |
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119 type Size = U32Be; |
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120 |
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121 /// Location of consecutive, fixed-size items. |
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122 /// |
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123 /// An item can be a single byte for paths, or a struct with |
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124 /// `derive(BytesCast)`. |
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125 #[derive(BytesCast, Copy, Clone)] |
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126 #[repr(C)] |
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127 struct Slice { |
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128 start: Offset, |
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129 len: Size, |
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130 } |
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131 |
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132 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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133 /// of either some other node or of the repository root. |
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134 /// |
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135 /// Always sorted by ascending `full_path`, to allow binary search. |
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136 /// Since nodes with the same parent nodes also have the same parent path, |
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137 /// only the `base_name`s need to be compared during binary search. |
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138 type ChildNodes = Slice; |
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139 |
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140 /// A `HgPath` of `len` bytes |
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141 type PathSlice = Slice; |
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142 |
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143 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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144 type OptPathSlice = Slice; |
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145 |
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146 /// Make sure that size-affecting changes are made knowingly |
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147 fn _static_assert_size_of() { |
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148 let _ = std::mem::transmute::<Header, [u8; 72]>; |
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149 let _ = std::mem::transmute::<Node, [u8; 57]>; |
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150 } |
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151 |
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152 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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153 /// |
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154 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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155 #[derive(Debug)] |
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156 pub struct DirstateV2ParseError; |
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157 |
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158 impl From<DirstateV2ParseError> for HgError { |
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159 fn from(_: DirstateV2ParseError) -> Self { |
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160 HgError::corrupted("dirstate-v2 parse error") |
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161 } |
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162 } |
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163 |
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164 impl From<DirstateV2ParseError> for crate::DirstateError { |
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165 fn from(error: DirstateV2ParseError) -> Self { |
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166 HgError::from(error).into() |
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167 } |
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168 } |
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169 |
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170 pub(super) fn read<'on_disk>( |
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171 on_disk: &'on_disk [u8], |
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172 ) -> Result< |
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173 (DirstateMap<'on_disk>, Option<DirstateParents>), |
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174 DirstateV2ParseError, |
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175 > { |
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176 if on_disk.is_empty() { |
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177 return Ok((DirstateMap::empty(on_disk), None)); |
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178 } |
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179 let (header, _) = |
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180 Header::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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181 let Header { |
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182 marker, |
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183 parents, |
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184 root, |
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185 nodes_with_entry_count, |
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186 nodes_with_copy_source_count, |
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187 } = header; |
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188 if marker != V2_FORMAT_MARKER { |
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189 return Err(DirstateV2ParseError); |
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190 } |
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191 let dirstate_map = DirstateMap { |
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192 on_disk, |
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193 root: dirstate_map::ChildNodes::OnDisk(read_slice::<Node>( |
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194 on_disk, *root, |
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195 )?), |
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196 nodes_with_entry_count: nodes_with_entry_count.get(), |
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197 nodes_with_copy_source_count: nodes_with_copy_source_count.get(), |
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198 }; |
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199 let parents = Some(parents.clone()); |
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200 Ok((dirstate_map, parents)) |
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201 } |
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202 |
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203 impl Node { |
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204 pub(super) fn full_path<'on_disk>( |
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205 &self, |
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206 on_disk: &'on_disk [u8], |
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207 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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208 read_hg_path(on_disk, self.full_path) |
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209 } |
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210 |
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211 pub(super) fn base_name_start<'on_disk>( |
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212 &self, |
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213 ) -> Result<usize, DirstateV2ParseError> { |
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214 let start = self.base_name_start.get(); |
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215 if start < self.full_path.len.get() { |
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216 let start = usize::try_from(start) |
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217 // u32 -> usize, could only panic on a 16-bit CPU |
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218 .expect("dirstate-v2 base_name_start out of bounds"); |
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219 Ok(start) |
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220 } else { |
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221 Err(DirstateV2ParseError) |
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222 } |
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223 } |
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224 |
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225 pub(super) fn base_name<'on_disk>( |
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226 &self, |
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227 on_disk: &'on_disk [u8], |
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228 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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229 let full_path = self.full_path(on_disk)?; |
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230 let base_name_start = self.base_name_start()?; |
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231 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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232 } |
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233 |
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234 pub(super) fn path<'on_disk>( |
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235 &self, |
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236 on_disk: &'on_disk [u8], |
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237 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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238 Ok(WithBasename::from_raw_parts( |
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239 Cow::Borrowed(self.full_path(on_disk)?), |
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240 self.base_name_start()?, |
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241 )) |
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242 } |
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243 |
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244 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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245 self.copy_source.start.get() != 0 |
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246 } |
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247 |
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248 pub(super) fn copy_source<'on_disk>( |
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249 &self, |
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250 on_disk: &'on_disk [u8], |
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251 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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252 Ok(if self.has_copy_source() { |
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253 Some(read_hg_path(on_disk, self.copy_source)?) |
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254 } else { |
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255 None |
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256 }) |
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257 } |
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258 |
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259 pub(super) fn node_data( |
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260 &self, |
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261 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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262 let entry = |state| { |
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263 dirstate_map::NodeData::Entry(self.entry_with_given_state(state)) |
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264 }; |
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265 |
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266 match self.state { |
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267 b'\0' => Ok(dirstate_map::NodeData::None), |
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268 b'd' => Ok(dirstate_map::NodeData::CachedDirectory { |
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269 mtime: *self.data.as_timestamp(), |
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270 }), |
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271 b'n' => Ok(entry(EntryState::Normal)), |
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272 b'a' => Ok(entry(EntryState::Added)), |
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273 b'r' => Ok(entry(EntryState::Removed)), |
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274 b'm' => Ok(entry(EntryState::Merged)), |
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275 _ => Err(DirstateV2ParseError), |
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276 } |
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277 } |
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278 |
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279 pub(super) fn cached_directory_mtime(&self) -> Option<&Timestamp> { |
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280 if self.state == b'd' { |
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281 Some(self.data.as_timestamp()) |
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282 } else { |
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283 None |
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284 } |
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285 } |
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286 |
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287 pub(super) fn state( |
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288 &self, |
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289 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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290 match self.state { |
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291 b'\0' | b'd' => Ok(None), |
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292 b'n' => Ok(Some(EntryState::Normal)), |
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293 b'a' => Ok(Some(EntryState::Added)), |
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294 b'r' => Ok(Some(EntryState::Removed)), |
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295 b'm' => Ok(Some(EntryState::Merged)), |
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296 _ => Err(DirstateV2ParseError), |
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297 } |
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298 } |
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299 |
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300 fn entry_with_given_state(&self, state: EntryState) -> DirstateEntry { |
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301 DirstateEntry { |
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302 state, |
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303 mode: self.data.mode.get(), |
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304 mtime: self.data.mtime.get(), |
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305 size: self.data.size.get(), |
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306 } |
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307 } |
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308 |
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309 pub(super) fn entry( |
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310 &self, |
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311 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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312 Ok(self |
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313 .state()? |
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314 .map(|state| self.entry_with_given_state(state))) |
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315 } |
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316 |
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317 pub(super) fn children<'on_disk>( |
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318 &self, |
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319 on_disk: &'on_disk [u8], |
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320 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
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321 read_slice::<Node>(on_disk, self.children) |
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322 } |
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323 |
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324 pub(super) fn to_in_memory_node<'on_disk>( |
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325 &self, |
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326 on_disk: &'on_disk [u8], |
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327 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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328 Ok(dirstate_map::Node { |
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329 children: dirstate_map::ChildNodes::OnDisk( |
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330 self.children(on_disk)?, |
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331 ), |
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332 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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333 data: self.node_data()?, |
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334 tracked_descendants_count: self.tracked_descendants_count.get(), |
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335 }) |
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336 } |
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337 } |
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338 |
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339 impl Entry { |
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340 fn from_timestamp(timestamp: Timestamp) -> Self { |
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341 // Safety: both types implement the `ByteCast` trait, so we could |
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342 // safely use `as_bytes` and `from_bytes` to do this conversion. Using |
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343 // `transmute` instead makes the compiler check that the two types |
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344 // have the same size, which eliminates the error case of |
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345 // `from_bytes`. |
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346 unsafe { std::mem::transmute::<Timestamp, Entry>(timestamp) } |
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347 } |
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348 |
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349 fn as_timestamp(&self) -> &Timestamp { |
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350 // Safety: same as above in `from_timestamp` |
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351 unsafe { &*(self as *const Entry as *const Timestamp) } |
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352 } |
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353 } |
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354 |
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355 impl Timestamp { |
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356 pub fn seconds(&self) -> i64 { |
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357 self.seconds.get() |
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358 } |
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359 } |
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360 |
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361 impl From<SystemTime> for Timestamp { |
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362 fn from(system_time: SystemTime) -> Self { |
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363 let (secs, nanos) = match system_time.duration_since(UNIX_EPOCH) { |
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364 Ok(duration) => { |
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365 (duration.as_secs() as i64, duration.subsec_nanos()) |
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366 } |
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367 Err(error) => { |
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368 let negative = error.duration(); |
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369 (-(negative.as_secs() as i64), negative.subsec_nanos()) |
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370 } |
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371 }; |
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372 Timestamp { |
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373 seconds: secs.into(), |
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374 nanoseconds: nanos.into(), |
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375 } |
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376 } |
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377 } |
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378 |
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379 impl From<&'_ Timestamp> for SystemTime { |
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380 fn from(timestamp: &'_ Timestamp) -> Self { |
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381 let secs = timestamp.seconds.get(); |
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382 let nanos = timestamp.nanoseconds.get(); |
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383 if secs >= 0 { |
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384 UNIX_EPOCH + Duration::new(secs as u64, nanos) |
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385 } else { |
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386 UNIX_EPOCH - Duration::new((-secs) as u64, nanos) |
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387 } |
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388 } |
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389 } |
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390 |
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391 fn read_hg_path( |
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392 on_disk: &[u8], |
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393 slice: Slice, |
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394 ) -> Result<&HgPath, DirstateV2ParseError> { |
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395 let bytes = read_slice::<u8>(on_disk, slice)?; |
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396 Ok(HgPath::new(bytes)) |
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397 } |
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398 |
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399 fn read_slice<T>( |
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400 on_disk: &[u8], |
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401 slice: Slice, |
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402 ) -> Result<&[T], DirstateV2ParseError> |
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403 where |
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404 T: BytesCast, |
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405 { |
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406 // Either `usize::MAX` would result in "out of bounds" error since a single |
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407 // `&[u8]` cannot occupy the entire addess space. |
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408 let start = usize::try_from(slice.start.get()).unwrap_or(std::usize::MAX); |
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409 let len = usize::try_from(slice.len.get()).unwrap_or(std::usize::MAX); |
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410 on_disk |
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411 .get(start..) |
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412 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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413 .map(|(slice, _rest)| slice) |
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414 .ok_or_else(|| DirstateV2ParseError) |
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415 } |
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416 |
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417 pub(super) fn write( |
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418 dirstate_map: &mut DirstateMap, |
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419 parents: DirstateParents, |
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420 ) -> Result<Vec<u8>, DirstateError> { |
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421 let header_len = std::mem::size_of::<Header>(); |
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422 |
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423 // This ignores the space for paths, and for nodes without an entry. |
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424 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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425 let size_guess = header_len |
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426 + std::mem::size_of::<Node>() |
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427 * dirstate_map.nodes_with_entry_count as usize; |
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428 let mut out = Vec::with_capacity(size_guess); |
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429 |
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430 // Keep space for the header. We’ll fill it out at the end when we know the |
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431 // actual offset for the root nodes. |
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432 out.resize(header_len, 0_u8); |
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433 |
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434 let root = |
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435 write_nodes(dirstate_map, dirstate_map.root.as_ref(), &mut out)?; |
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436 |
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437 let header = Header { |
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438 marker: *V2_FORMAT_MARKER, |
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439 parents: parents, |
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440 root, |
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441 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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442 nodes_with_copy_source_count: dirstate_map |
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443 .nodes_with_copy_source_count |
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444 .into(), |
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445 }; |
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446 out[..header_len].copy_from_slice(header.as_bytes()); |
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447 Ok(out) |
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448 } |
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449 |
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450 fn write_nodes( |
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451 dirstate_map: &DirstateMap, |
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452 nodes: dirstate_map::ChildNodesRef, |
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453 out: &mut Vec<u8>, |
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454 ) -> Result<ChildNodes, DirstateError> { |
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455 // `dirstate_map::ChildNodes` is a `HashMap` with undefined iteration |
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456 // order. Sort to enable binary search in the written file. |
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457 let nodes = nodes.sorted(); |
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458 |
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459 // First accumulate serialized nodes in a `Vec` |
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460 let mut on_disk_nodes = Vec::with_capacity(nodes.len()); |
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461 for node in nodes { |
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462 let children = write_nodes( |
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463 dirstate_map, |
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464 node.children(dirstate_map.on_disk)?, |
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465 out, |
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466 )?; |
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467 let full_path = node.full_path(dirstate_map.on_disk)?; |
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468 let full_path = write_slice::<u8>(full_path.as_bytes(), out); |
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469 let copy_source = |
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470 if let Some(source) = node.copy_source(dirstate_map.on_disk)? { |
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471 write_slice::<u8>(source.as_bytes(), out) |
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472 } else { |
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473 Slice { |
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474 start: 0.into(), |
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475 len: 0.into(), |
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476 } |
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477 }; |
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478 on_disk_nodes.push(match node { |
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479 NodeRef::InMemory(path, node) => { |
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480 let (state, data) = match &node.data { |
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481 dirstate_map::NodeData::Entry(entry) => ( |
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482 entry.state.into(), |
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483 Entry { |
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484 mode: entry.mode.into(), |
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485 mtime: entry.mtime.into(), |
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486 size: entry.size.into(), |
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487 }, |
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488 ), |
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489 dirstate_map::NodeData::CachedDirectory { mtime } => { |
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490 (b'd', Entry::from_timestamp(*mtime)) |
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491 } |
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492 dirstate_map::NodeData::None => ( |
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493 b'\0', |
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494 Entry { |
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495 mode: 0.into(), |
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496 mtime: 0.into(), |
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497 size: 0.into(), |
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498 }, |
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499 ), |
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500 }; |
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501 Node { |
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502 children, |
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503 copy_source, |
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504 full_path, |
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505 base_name_start: u32::try_from(path.base_name_start()) |
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506 // Could only panic for paths over 4 GiB |
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507 .expect("dirstate-v2 offset overflow") |
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508 .into(), |
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509 tracked_descendants_count: node |
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510 .tracked_descendants_count |
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511 .into(), |
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512 state, |
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513 data, |
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514 } |
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515 } |
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516 NodeRef::OnDisk(node) => Node { |
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517 children, |
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518 copy_source, |
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519 full_path, |
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520 ..*node |
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521 }, |
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522 }) |
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523 } |
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524 // … so we can write them contiguously |
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525 Ok(write_slice::<Node>(&on_disk_nodes, out)) |
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526 } |
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527 |
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528 fn write_slice<T>(slice: &[T], out: &mut Vec<u8>) -> Slice |
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529 where |
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530 T: BytesCast, |
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531 { |
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532 let start = u64::try_from(out.len()) |
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533 // Could only panic on a 128-bit CPU with a dirstate over 16 EiB |
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534 .expect("dirstate-v2 offset overflow") |
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535 .into(); |
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536 let len = u32::try_from(slice.len()) |
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537 // Could only panic for paths over 4 GiB or nodes with over 4 billions |
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538 // child nodes |
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539 .expect("dirstate-v2 offset overflow") |
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540 .into(); |
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541 out.extend(slice.as_bytes()); |
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542 Slice { start, len } |
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543 } |