Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 47334:18b3060fe598
dirstate-v2: Add a zero-size error type for dirstate v2 parse errors
This error should only happen if Mercurial is buggy or the file is corrupted.
It indicates for example that:
* A part of the file refers to another part, and the byte offset or item count
would cause reading out of bounds, beyond the end of the file.
* The byte for an entry state has an invalid value
When parsing becomes lazy, many more functions will return a `Result` with
this error. Making it zero-size reduces the work that the `?` operator needs
to do to pass around the error value.
Differential Revision: https://phab.mercurial-scm.org/D10748
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 19 May 2021 13:15:00 +0200 |
parents | 69530e5d4fe5 |
children | ed1583a845d2 |
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 bytes_cast::unaligned::{I32Be, U32Be, U64Be}; |
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20 use bytes_cast::BytesCast; |
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21 use std::borrow::Cow; |
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22 use std::convert::{TryFrom, TryInto}; |
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23 |
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24 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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25 /// This a redundant sanity check more than an actual "magic number" since |
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26 /// `.hg/requires` already governs which format should be used. |
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27 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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28 |
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29 #[derive(BytesCast)] |
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30 #[repr(C)] |
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31 struct Header { |
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32 marker: [u8; V2_FORMAT_MARKER.len()], |
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33 |
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34 /// `dirstatemap.parents()` in `mercurial/dirstate.py` relies on this |
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35 /// `parents` field being at this offset, immediately after `marker`. |
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36 parents: DirstateParents, |
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37 |
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38 root: ChildNodes, |
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39 nodes_with_entry_count: Size, |
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40 nodes_with_copy_source_count: Size, |
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41 } |
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42 |
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43 #[derive(BytesCast)] |
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44 #[repr(C)] |
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45 struct Node { |
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46 full_path: PathSlice, |
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47 |
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48 /// In bytes from `self.full_path.start` |
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49 base_name_start: Size, |
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50 |
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51 copy_source: OptPathSlice, |
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52 entry: OptEntry, |
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53 children: ChildNodes, |
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54 tracked_descendants_count: Size, |
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55 } |
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56 |
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57 /// Either nothing if `state == b'\0'`, or a dirstate entry like in the v1 |
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58 /// format |
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59 #[derive(BytesCast)] |
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60 #[repr(C)] |
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61 struct OptEntry { |
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62 state: u8, |
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63 mode: I32Be, |
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64 mtime: I32Be, |
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65 size: I32Be, |
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66 } |
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67 |
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68 /// Counted in bytes from the start of the file |
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69 /// |
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70 /// NOTE: If we decide to never support `.hg/dirstate` files larger than 4 GiB |
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71 /// we could save space by using `U32Be` instead. |
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72 type Offset = U64Be; |
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73 |
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74 /// Counted in number of items |
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75 /// |
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76 /// NOTE: not supporting directories with more than 4 billion direct children, |
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77 /// or filenames more than 4 GiB. |
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78 type Size = U32Be; |
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79 |
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80 /// Location of consecutive, fixed-size items. |
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81 /// |
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82 /// An item can be a single byte for paths, or a struct with |
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83 /// `derive(BytesCast)`. |
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84 #[derive(BytesCast, Copy, Clone)] |
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85 #[repr(C)] |
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86 struct Slice { |
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87 start: Offset, |
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88 len: Size, |
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89 } |
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90 |
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91 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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92 /// of either some other node or of the repository root. |
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93 /// |
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94 /// Always sorted by ascending `full_path`, to allow binary search. |
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95 /// Since nodes with the same parent nodes also have the same parent path, |
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96 /// only the `base_name`s need to be compared during binary search. |
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97 type ChildNodes = Slice; |
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98 |
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99 /// A `HgPath` of `len` bytes |
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100 type PathSlice = Slice; |
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101 |
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102 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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103 type OptPathSlice = Slice; |
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104 |
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105 /// Make sure that size-affecting changes are made knowingly |
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106 fn _static_assert_size_of() { |
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107 let _ = std::mem::transmute::<Header, [u8; 72]>; |
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108 let _ = std::mem::transmute::<Node, [u8; 57]>; |
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109 } |
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110 |
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111 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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112 pub(crate) struct DirstateV2ParseError; |
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113 |
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114 impl From<DirstateV2ParseError> for HgError { |
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115 fn from(_: DirstateV2ParseError) -> Self { |
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116 HgError::corrupted("dirstate-v2 parse error") |
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117 } |
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118 } |
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119 |
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120 impl From<DirstateV2ParseError> for crate::DirstateError { |
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121 fn from(error: DirstateV2ParseError) -> Self { |
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122 HgError::from(error).into() |
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123 } |
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124 } |
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125 |
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126 pub(super) fn read<'on_disk>( |
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127 on_disk: &'on_disk [u8], |
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128 ) -> Result< |
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129 (DirstateMap<'on_disk>, Option<DirstateParents>), |
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130 DirstateV2ParseError, |
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131 > { |
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132 if on_disk.is_empty() { |
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133 return Ok((DirstateMap::empty(on_disk), None)); |
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134 } |
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135 let (header, _) = |
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136 Header::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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137 let Header { |
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138 marker, |
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139 parents, |
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140 root, |
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141 nodes_with_entry_count, |
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142 nodes_with_copy_source_count, |
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143 } = header; |
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144 if marker != V2_FORMAT_MARKER { |
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145 return Err(DirstateV2ParseError); |
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146 } |
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147 let dirstate_map = DirstateMap { |
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148 on_disk, |
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149 root: read_nodes(on_disk, *root)?, |
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150 nodes_with_entry_count: nodes_with_entry_count.get(), |
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151 nodes_with_copy_source_count: nodes_with_copy_source_count.get(), |
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152 }; |
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153 let parents = Some(parents.clone()); |
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154 Ok((dirstate_map, parents)) |
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155 } |
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156 |
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157 impl Node { |
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158 pub(super) fn path<'on_disk>( |
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159 &self, |
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160 on_disk: &'on_disk [u8], |
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161 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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162 let full_path = read_hg_path(on_disk, self.full_path)?; |
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163 let base_name_start = usize::try_from(self.base_name_start.get()) |
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164 // u32 -> usize, could only panic on a 16-bit CPU |
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165 .expect("dirstate-v2 base_name_start out of bounds"); |
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166 if base_name_start < full_path.len() { |
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167 Ok(WithBasename::from_raw_parts(full_path, base_name_start)) |
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168 } else { |
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169 Err(DirstateV2ParseError) |
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170 } |
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171 } |
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172 |
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173 pub(super) fn copy_source<'on_disk>( |
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174 &self, |
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175 on_disk: &'on_disk [u8], |
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176 ) -> Result<Option<Cow<'on_disk, HgPath>>, DirstateV2ParseError> { |
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177 Ok(if self.copy_source.start.get() != 0 { |
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178 Some(read_hg_path(on_disk, self.copy_source)?) |
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179 } else { |
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180 None |
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181 }) |
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182 } |
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183 |
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184 pub(super) fn entry( |
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185 &self, |
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186 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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187 Ok(if self.entry.state != b'\0' { |
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188 Some(DirstateEntry { |
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189 state: self |
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190 .entry |
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191 .state |
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192 .try_into() |
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193 .map_err(|_| DirstateV2ParseError)?, |
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194 mode: self.entry.mode.get(), |
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195 mtime: self.entry.mtime.get(), |
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196 size: self.entry.size.get(), |
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197 }) |
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198 } else { |
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199 None |
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200 }) |
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201 } |
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202 |
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203 pub(super) fn to_in_memory_node<'on_disk>( |
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204 &self, |
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205 on_disk: &'on_disk [u8], |
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206 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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207 Ok(dirstate_map::Node { |
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208 children: read_nodes(on_disk, self.children)?, |
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209 copy_source: self.copy_source(on_disk)?, |
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210 entry: self.entry()?, |
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211 tracked_descendants_count: self.tracked_descendants_count.get(), |
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212 }) |
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213 } |
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214 } |
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215 |
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216 fn read_nodes( |
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217 on_disk: &[u8], |
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218 slice: ChildNodes, |
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219 ) -> Result<dirstate_map::ChildNodes, DirstateV2ParseError> { |
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220 read_slice::<Node>(on_disk, slice)? |
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221 .iter() |
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222 .map(|node| { |
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223 Ok((node.path(on_disk)?, node.to_in_memory_node(on_disk)?)) |
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224 }) |
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225 .collect::<Result<_, _>>() |
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226 .map(dirstate_map::ChildNodes::InMemory) |
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227 } |
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228 |
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229 fn read_hg_path( |
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230 on_disk: &[u8], |
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231 slice: Slice, |
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232 ) -> Result<Cow<HgPath>, DirstateV2ParseError> { |
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233 let bytes = read_slice::<u8>(on_disk, slice)?; |
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234 Ok(Cow::Borrowed(HgPath::new(bytes))) |
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235 } |
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236 |
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237 fn read_slice<T>( |
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238 on_disk: &[u8], |
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239 slice: Slice, |
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240 ) -> Result<&[T], DirstateV2ParseError> |
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241 where |
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242 T: BytesCast, |
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243 { |
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244 // Either `usize::MAX` would result in "out of bounds" error since a single |
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245 // `&[u8]` cannot occupy the entire addess space. |
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246 let start = usize::try_from(slice.start.get()).unwrap_or(std::usize::MAX); |
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247 let len = usize::try_from(slice.len.get()).unwrap_or(std::usize::MAX); |
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248 on_disk |
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249 .get(start..) |
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250 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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251 .map(|(slice, _rest)| slice) |
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252 .ok_or_else(|| DirstateV2ParseError) |
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253 } |
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254 |
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255 pub(super) fn write( |
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256 dirstate_map: &mut DirstateMap, |
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257 parents: DirstateParents, |
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258 ) -> Result<Vec<u8>, DirstateError> { |
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259 let header_len = std::mem::size_of::<Header>(); |
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260 |
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261 // This ignores the space for paths, and for nodes without an entry. |
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262 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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263 let size_guess = header_len |
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264 + std::mem::size_of::<Node>() |
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265 * dirstate_map.nodes_with_entry_count as usize; |
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266 let mut out = Vec::with_capacity(size_guess); |
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267 |
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268 // Keep space for the header. We’ll fill it out at the end when we know the |
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269 // actual offset for the root nodes. |
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270 out.resize(header_len, 0_u8); |
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271 |
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272 let root = write_nodes(dirstate_map.root.as_ref(), &mut out)?; |
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273 |
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274 let header = Header { |
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275 marker: *V2_FORMAT_MARKER, |
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276 parents: parents, |
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277 root, |
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278 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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279 nodes_with_copy_source_count: dirstate_map |
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280 .nodes_with_copy_source_count |
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281 .into(), |
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282 }; |
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283 out[..header_len].copy_from_slice(header.as_bytes()); |
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284 Ok(out) |
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285 } |
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286 |
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287 fn write_nodes( |
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288 nodes: dirstate_map::ChildNodesRef, |
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289 out: &mut Vec<u8>, |
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290 ) -> Result<ChildNodes, DirstateError> { |
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291 // `dirstate_map::ChildNodes` is a `HashMap` with undefined iteration |
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292 // order. Sort to enable binary search in the written file. |
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293 let nodes = nodes.sorted(); |
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294 |
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295 // First accumulate serialized nodes in a `Vec` |
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296 let mut on_disk_nodes = Vec::with_capacity(nodes.len()); |
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297 for node in nodes { |
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298 let children = write_nodes(node.children(), out)?; |
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299 let full_path = write_slice::<u8>(node.full_path().as_bytes(), out); |
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300 let copy_source = if let Some(source) = node.copy_source() { |
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301 write_slice::<u8>(source.as_bytes(), out) |
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302 } else { |
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303 Slice { |
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304 start: 0.into(), |
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305 len: 0.into(), |
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306 } |
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307 }; |
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308 on_disk_nodes.push(match node { |
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309 NodeRef::InMemory(path, node) => Node { |
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310 children, |
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311 copy_source, |
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312 full_path, |
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313 base_name_start: u32::try_from(path.base_name_start()) |
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314 // Could only panic for paths over 4 GiB |
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315 .expect("dirstate-v2 offset overflow") |
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316 .into(), |
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317 tracked_descendants_count: node |
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318 .tracked_descendants_count |
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319 .into(), |
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320 entry: if let Some(entry) = &node.entry { |
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321 OptEntry { |
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322 state: entry.state.into(), |
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323 mode: entry.mode.into(), |
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324 mtime: entry.mtime.into(), |
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325 size: entry.size.into(), |
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326 } |
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327 } else { |
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328 OptEntry { |
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329 state: b'\0', |
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330 mode: 0.into(), |
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331 mtime: 0.into(), |
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332 size: 0.into(), |
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333 } |
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334 }, |
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335 }, |
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336 }) |
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337 } |
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338 // … so we can write them contiguously |
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339 Ok(write_slice::<Node>(&on_disk_nodes, out)) |
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340 } |
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341 |
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342 fn write_slice<T>(slice: &[T], out: &mut Vec<u8>) -> Slice |
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343 where |
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344 T: BytesCast, |
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345 { |
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346 let start = u64::try_from(out.len()) |
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347 // Could only panic on a 128-bit CPU with a dirstate over 16 EiB |
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348 .expect("dirstate-v2 offset overflow") |
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349 .into(); |
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350 let len = u32::try_from(slice.len()) |
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351 // Could only panic for paths over 4 GiB or nodes with over 4 billions |
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352 // child nodes |
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353 .expect("dirstate-v2 offset overflow") |
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354 .into(); |
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355 out.extend(slice.as_bytes()); |
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356 Slice { start, len } |
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357 } |