Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 49373:f8ec7b16c98f stable
rust: add message to `DirstateV2ParseError` to give some context
This is useful when debugging.
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Wed, 18 May 2022 09:50:39 +0100 |
parents | 288de6f5d724 |
children | c7fb9b74e753 f2e13d8d30e0 |
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1 //! The "version 2" disk representation of the dirstate |
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2 //! |
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3 //! See `mercurial/helptext/internals/dirstate-v2.txt` |
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4 |
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5 use crate::dirstate::{DirstateV2Data, TruncatedTimestamp}; |
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6 use crate::dirstate_tree::dirstate_map::DirstateVersion; |
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7 use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef}; |
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8 use crate::dirstate_tree::path_with_basename::WithBasename; |
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9 use crate::errors::HgError; |
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10 use crate::utils::hg_path::HgPath; |
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11 use crate::DirstateEntry; |
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12 use crate::DirstateError; |
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13 use crate::DirstateParents; |
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14 use bitflags::bitflags; |
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15 use bytes_cast::unaligned::{U16Be, U32Be}; |
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16 use bytes_cast::BytesCast; |
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17 use format_bytes::format_bytes; |
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18 use rand::Rng; |
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19 use std::borrow::Cow; |
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20 use std::convert::{TryFrom, TryInto}; |
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21 use std::fmt::Write; |
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22 |
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23 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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24 /// This a redundant sanity check more than an actual "magic number" since |
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25 /// `.hg/requires` already governs which format should be used. |
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26 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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27 |
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28 /// Keep space for 256-bit hashes |
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29 const STORED_NODE_ID_BYTES: usize = 32; |
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30 |
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31 /// … even though only 160 bits are used for now, with SHA-1 |
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32 const USED_NODE_ID_BYTES: usize = 20; |
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33 |
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34 pub(super) const IGNORE_PATTERNS_HASH_LEN: usize = 20; |
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35 pub(super) type IgnorePatternsHash = [u8; IGNORE_PATTERNS_HASH_LEN]; |
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36 |
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37 /// Must match constants of the same names in `mercurial/dirstateutils/v2.py` |
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38 const TREE_METADATA_SIZE: usize = 44; |
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39 const NODE_SIZE: usize = 44; |
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40 |
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41 /// Make sure that size-affecting changes are made knowingly |
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42 #[allow(unused)] |
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43 fn static_assert_size_of() { |
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44 let _ = std::mem::transmute::<TreeMetadata, [u8; TREE_METADATA_SIZE]>; |
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45 let _ = std::mem::transmute::<DocketHeader, [u8; TREE_METADATA_SIZE + 81]>; |
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46 let _ = std::mem::transmute::<Node, [u8; NODE_SIZE]>; |
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47 } |
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48 |
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49 // Must match `HEADER` in `mercurial/dirstateutils/docket.py` |
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50 #[derive(BytesCast)] |
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51 #[repr(C)] |
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52 struct DocketHeader { |
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53 marker: [u8; V2_FORMAT_MARKER.len()], |
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54 parent_1: [u8; STORED_NODE_ID_BYTES], |
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55 parent_2: [u8; STORED_NODE_ID_BYTES], |
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56 |
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57 metadata: TreeMetadata, |
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58 |
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59 /// Counted in bytes |
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60 data_size: Size, |
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61 |
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62 uuid_size: u8, |
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63 } |
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64 |
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65 pub struct Docket<'on_disk> { |
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66 header: &'on_disk DocketHeader, |
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67 pub uuid: &'on_disk [u8], |
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68 } |
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69 |
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70 /// Fields are documented in the *Tree metadata in the docket file* |
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71 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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72 #[derive(BytesCast)] |
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73 #[repr(C)] |
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74 pub struct TreeMetadata { |
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75 root_nodes: ChildNodes, |
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76 nodes_with_entry_count: Size, |
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77 nodes_with_copy_source_count: Size, |
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78 unreachable_bytes: Size, |
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79 unused: [u8; 4], |
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80 |
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81 /// See *Optional hash of ignore patterns* section of |
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82 /// `mercurial/helptext/internals/dirstate-v2.txt` |
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83 ignore_patterns_hash: IgnorePatternsHash, |
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84 } |
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85 |
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86 /// Fields are documented in the *The data file format* |
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87 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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88 #[derive(BytesCast, Debug)] |
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89 #[repr(C)] |
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90 pub(super) struct Node { |
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91 full_path: PathSlice, |
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92 |
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93 /// In bytes from `self.full_path.start` |
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94 base_name_start: PathSize, |
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95 |
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96 copy_source: OptPathSlice, |
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97 children: ChildNodes, |
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98 pub(super) descendants_with_entry_count: Size, |
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99 pub(super) tracked_descendants_count: Size, |
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100 flags: U16Be, |
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101 size: U32Be, |
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102 mtime: PackedTruncatedTimestamp, |
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103 } |
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104 |
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105 bitflags! { |
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106 #[repr(C)] |
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107 struct Flags: u16 { |
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108 const WDIR_TRACKED = 1 << 0; |
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109 const P1_TRACKED = 1 << 1; |
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110 const P2_INFO = 1 << 2; |
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111 const MODE_EXEC_PERM = 1 << 3; |
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112 const MODE_IS_SYMLINK = 1 << 4; |
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113 const HAS_FALLBACK_EXEC = 1 << 5; |
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114 const FALLBACK_EXEC = 1 << 6; |
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115 const HAS_FALLBACK_SYMLINK = 1 << 7; |
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116 const FALLBACK_SYMLINK = 1 << 8; |
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117 const EXPECTED_STATE_IS_MODIFIED = 1 << 9; |
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118 const HAS_MODE_AND_SIZE = 1 <<10; |
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119 const HAS_MTIME = 1 <<11; |
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120 const MTIME_SECOND_AMBIGUOUS = 1 << 12; |
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121 const DIRECTORY = 1 <<13; |
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122 const ALL_UNKNOWN_RECORDED = 1 <<14; |
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123 const ALL_IGNORED_RECORDED = 1 <<15; |
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124 } |
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125 } |
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126 |
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127 /// Duration since the Unix epoch |
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128 #[derive(BytesCast, Copy, Clone, Debug)] |
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129 #[repr(C)] |
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130 struct PackedTruncatedTimestamp { |
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131 truncated_seconds: U32Be, |
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132 nanoseconds: U32Be, |
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133 } |
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134 |
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135 /// Counted in bytes from the start of the file |
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136 /// |
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137 /// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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138 type Offset = U32Be; |
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139 |
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140 /// Counted in number of items |
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141 /// |
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142 /// NOTE: we choose not to support counting more than 4 billion nodes anywhere. |
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143 type Size = U32Be; |
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144 |
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145 /// Counted in bytes |
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146 /// |
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147 /// NOTE: we choose not to support file names/paths longer than 64 KiB. |
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148 type PathSize = U16Be; |
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149 |
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150 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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151 /// of either some other node or of the repository root. |
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152 /// |
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153 /// Always sorted by ascending `full_path`, to allow binary search. |
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154 /// Since nodes with the same parent nodes also have the same parent path, |
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155 /// only the `base_name`s need to be compared during binary search. |
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156 #[derive(BytesCast, Copy, Clone, Debug)] |
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157 #[repr(C)] |
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158 struct ChildNodes { |
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159 start: Offset, |
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160 len: Size, |
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161 } |
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162 |
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163 /// A `HgPath` of `len` bytes |
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164 #[derive(BytesCast, Copy, Clone, Debug)] |
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165 #[repr(C)] |
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166 struct PathSlice { |
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167 start: Offset, |
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168 len: PathSize, |
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169 } |
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170 |
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171 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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172 type OptPathSlice = PathSlice; |
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173 |
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174 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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175 /// |
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176 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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177 #[derive(Debug)] |
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178 pub struct DirstateV2ParseError { |
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179 message: String, |
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180 } |
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181 |
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182 impl DirstateV2ParseError { |
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183 pub fn new<S: Into<String>>(message: S) -> Self { |
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184 Self { |
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185 message: message.into(), |
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186 } |
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187 } |
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188 } |
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189 |
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190 impl From<DirstateV2ParseError> for HgError { |
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191 fn from(e: DirstateV2ParseError) -> Self { |
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192 HgError::corrupted(format!("dirstate-v2 parse error: {}", e.message)) |
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193 } |
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194 } |
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195 |
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196 impl From<DirstateV2ParseError> for crate::DirstateError { |
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197 fn from(error: DirstateV2ParseError) -> Self { |
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198 HgError::from(error).into() |
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199 } |
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200 } |
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201 |
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202 impl TreeMetadata { |
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203 pub fn as_bytes(&self) -> &[u8] { |
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204 BytesCast::as_bytes(self) |
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205 } |
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206 } |
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207 |
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208 impl<'on_disk> Docket<'on_disk> { |
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209 /// Generate the identifier for a new data file |
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210 /// |
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211 /// TODO: support the `HGTEST_UUIDFILE` environment variable. |
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212 /// See `mercurial/revlogutils/docket.py` |
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213 pub fn new_uid() -> String { |
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214 const ID_LENGTH: usize = 8; |
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215 let mut id = String::with_capacity(ID_LENGTH); |
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216 let mut rng = rand::thread_rng(); |
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217 for _ in 0..ID_LENGTH { |
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218 // One random hexadecimal digit. |
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219 // `unwrap` never panics because `impl Write for String` |
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220 // never returns an error. |
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221 write!(&mut id, "{:x}", rng.gen_range(0..16)).unwrap(); |
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222 } |
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223 id |
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224 } |
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225 |
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226 pub fn serialize( |
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227 parents: DirstateParents, |
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228 tree_metadata: TreeMetadata, |
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229 data_size: u64, |
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230 uuid: &[u8], |
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231 ) -> Result<Vec<u8>, std::num::TryFromIntError> { |
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232 let header = DocketHeader { |
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233 marker: *V2_FORMAT_MARKER, |
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234 parent_1: parents.p1.pad_to_256_bits(), |
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235 parent_2: parents.p2.pad_to_256_bits(), |
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236 metadata: tree_metadata, |
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237 data_size: u32::try_from(data_size)?.into(), |
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238 uuid_size: uuid.len().try_into()?, |
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239 }; |
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240 let header = header.as_bytes(); |
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241 let mut docket = Vec::with_capacity(header.len() + uuid.len()); |
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242 docket.extend_from_slice(header); |
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243 docket.extend_from_slice(uuid); |
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244 Ok(docket) |
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245 } |
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246 |
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247 pub fn parents(&self) -> DirstateParents { |
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248 use crate::Node; |
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249 let p1 = Node::try_from(&self.header.parent_1[..USED_NODE_ID_BYTES]) |
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250 .unwrap() |
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251 .clone(); |
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252 let p2 = Node::try_from(&self.header.parent_2[..USED_NODE_ID_BYTES]) |
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253 .unwrap() |
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254 .clone(); |
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255 DirstateParents { p1, p2 } |
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256 } |
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257 |
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258 pub fn tree_metadata(&self) -> &[u8] { |
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259 self.header.metadata.as_bytes() |
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260 } |
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261 |
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262 pub fn data_size(&self) -> usize { |
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263 // This `unwrap` could only panic on a 16-bit CPU |
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264 self.header.data_size.get().try_into().unwrap() |
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265 } |
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266 |
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267 pub fn data_filename(&self) -> String { |
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268 String::from_utf8(format_bytes!(b"dirstate.{}", self.uuid)).unwrap() |
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269 } |
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270 } |
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271 |
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272 pub fn read_docket( |
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273 on_disk: &[u8], |
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274 ) -> Result<Docket<'_>, DirstateV2ParseError> { |
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275 let (header, uuid) = DocketHeader::from_bytes(on_disk).map_err(|e| { |
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276 DirstateV2ParseError::new(format!("when reading docket, {}", e)) |
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277 })?; |
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278 let uuid_size = header.uuid_size as usize; |
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279 if header.marker == *V2_FORMAT_MARKER && uuid.len() == uuid_size { |
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280 Ok(Docket { header, uuid }) |
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281 } else { |
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282 Err(DirstateV2ParseError::new( |
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283 "invalid format marker or uuid size", |
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284 )) |
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285 } |
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286 } |
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287 |
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288 pub(super) fn read<'on_disk>( |
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289 on_disk: &'on_disk [u8], |
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290 metadata: &[u8], |
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291 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> { |
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292 if on_disk.is_empty() { |
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293 let mut map = DirstateMap::empty(on_disk); |
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294 map.dirstate_version = DirstateVersion::V2; |
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295 return Ok(map); |
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296 } |
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297 let (meta, _) = TreeMetadata::from_bytes(metadata).map_err(|e| { |
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298 DirstateV2ParseError::new(format!("when parsing tree metadata, {}", e)) |
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299 })?; |
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300 let dirstate_map = DirstateMap { |
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301 on_disk, |
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302 root: dirstate_map::ChildNodes::OnDisk( |
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303 read_nodes(on_disk, meta.root_nodes).map_err(|mut e| { |
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304 e.message = format!("{}, when reading root notes", e.message); |
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305 e |
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306 })?, |
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307 ), |
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308 nodes_with_entry_count: meta.nodes_with_entry_count.get(), |
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309 nodes_with_copy_source_count: meta.nodes_with_copy_source_count.get(), |
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310 ignore_patterns_hash: meta.ignore_patterns_hash, |
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311 unreachable_bytes: meta.unreachable_bytes.get(), |
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312 old_data_size: on_disk.len(), |
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313 dirstate_version: DirstateVersion::V2, |
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314 }; |
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315 Ok(dirstate_map) |
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316 } |
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317 |
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318 impl Node { |
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319 pub(super) fn full_path<'on_disk>( |
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320 &self, |
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321 on_disk: &'on_disk [u8], |
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322 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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323 read_hg_path(on_disk, self.full_path) |
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324 } |
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325 |
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326 pub(super) fn base_name_start<'on_disk>( |
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327 &self, |
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328 ) -> Result<usize, DirstateV2ParseError> { |
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329 let start = self.base_name_start.get(); |
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330 if start < self.full_path.len.get() { |
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331 let start = usize::try_from(start) |
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332 // u32 -> usize, could only panic on a 16-bit CPU |
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333 .expect("dirstate-v2 base_name_start out of bounds"); |
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334 Ok(start) |
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335 } else { |
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336 Err(DirstateV2ParseError::new("not enough bytes for base name")) |
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337 } |
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338 } |
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339 |
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340 pub(super) fn base_name<'on_disk>( |
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341 &self, |
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342 on_disk: &'on_disk [u8], |
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343 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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344 let full_path = self.full_path(on_disk)?; |
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345 let base_name_start = self.base_name_start()?; |
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346 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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347 } |
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348 |
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349 pub(super) fn path<'on_disk>( |
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350 &self, |
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351 on_disk: &'on_disk [u8], |
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352 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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353 Ok(WithBasename::from_raw_parts( |
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354 Cow::Borrowed(self.full_path(on_disk)?), |
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355 self.base_name_start()?, |
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356 )) |
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357 } |
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358 |
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359 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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360 self.copy_source.start.get() != 0 |
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361 } |
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362 |
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363 pub(super) fn copy_source<'on_disk>( |
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364 &self, |
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365 on_disk: &'on_disk [u8], |
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366 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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367 Ok(if self.has_copy_source() { |
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368 Some(read_hg_path(on_disk, self.copy_source)?) |
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369 } else { |
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370 None |
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371 }) |
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372 } |
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373 |
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374 fn flags(&self) -> Flags { |
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375 Flags::from_bits_truncate(self.flags.get()) |
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376 } |
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377 |
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378 fn has_entry(&self) -> bool { |
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379 self.flags().intersects( |
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380 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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381 ) |
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382 } |
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383 |
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384 pub(super) fn node_data( |
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385 &self, |
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386 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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387 if self.has_entry() { |
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388 Ok(dirstate_map::NodeData::Entry(self.assume_entry()?)) |
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389 } else if let Some(mtime) = self.cached_directory_mtime()? { |
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390 Ok(dirstate_map::NodeData::CachedDirectory { mtime }) |
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391 } else { |
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392 Ok(dirstate_map::NodeData::None) |
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393 } |
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394 } |
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395 |
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396 pub(super) fn cached_directory_mtime( |
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397 &self, |
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398 ) -> Result<Option<TruncatedTimestamp>, DirstateV2ParseError> { |
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399 // For now we do not have code to handle the absence of |
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400 // ALL_UNKNOWN_RECORDED, so we ignore the mtime if the flag is |
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401 // unset. |
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402 if self.flags().contains(Flags::DIRECTORY) |
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|
403 && self.flags().contains(Flags::HAS_MTIME) |
48251
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404 && self.flags().contains(Flags::ALL_UNKNOWN_RECORDED) |
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405 { |
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406 Ok(Some(self.mtime()?)) |
48232
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407 } else { |
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408 Ok(None) |
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409 } |
47349
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410 } |
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411 |
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412 fn synthesize_unix_mode(&self) -> u32 { |
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413 let file_type = if self.flags().contains(Flags::MODE_IS_SYMLINK) { |
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414 libc::S_IFLNK |
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415 } else { |
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416 libc::S_IFREG |
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417 }; |
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418 let permisions = if self.flags().contains(Flags::MODE_EXEC_PERM) { |
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419 0o755 |
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420 } else { |
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421 0o644 |
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422 }; |
48568
440972d2175d
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diff
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|
423 (file_type | permisions).into() |
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424 } |
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425 |
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426 fn mtime(&self) -> Result<TruncatedTimestamp, DirstateV2ParseError> { |
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427 let mut m: TruncatedTimestamp = self.mtime.try_into()?; |
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428 if self.flags().contains(Flags::MTIME_SECOND_AMBIGUOUS) { |
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429 m.second_ambiguous = true; |
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430 } |
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431 Ok(m) |
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432 } |
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433 |
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434 fn assume_entry(&self) -> Result<DirstateEntry, DirstateV2ParseError> { |
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435 // TODO: convert through raw bits instead? |
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436 let wc_tracked = self.flags().contains(Flags::WDIR_TRACKED); |
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437 let p1_tracked = self.flags().contains(Flags::P1_TRACKED); |
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438 let p2_info = self.flags().contains(Flags::P2_INFO); |
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439 let mode_size = if self.flags().contains(Flags::HAS_MODE_AND_SIZE) |
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440 && !self.flags().contains(Flags::EXPECTED_STATE_IS_MODIFIED) |
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441 { |
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442 Some((self.synthesize_unix_mode(), self.size.into())) |
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443 } else { |
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444 None |
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445 }; |
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446 let mtime = if self.flags().contains(Flags::HAS_MTIME) |
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447 && !self.flags().contains(Flags::DIRECTORY) |
48250
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448 && !self.flags().contains(Flags::EXPECTED_STATE_IS_MODIFIED) |
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449 { |
48501
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|
450 Some(self.mtime()?) |
48139
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451 } else { |
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452 None |
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453 }; |
48265
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454 let fallback_exec = if self.flags().contains(Flags::HAS_FALLBACK_EXEC) |
3861e3f6ad54
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455 { |
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456 Some(self.flags().contains(Flags::FALLBACK_EXEC)) |
3861e3f6ad54
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457 } else { |
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|
458 None |
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459 }; |
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460 let fallback_symlink = |
3861e3f6ad54
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461 if self.flags().contains(Flags::HAS_FALLBACK_SYMLINK) { |
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462 Some(self.flags().contains(Flags::FALLBACK_SYMLINK)) |
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463 } else { |
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|
464 None |
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465 }; |
49100
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|
466 Ok(DirstateEntry::from_v2_data(DirstateV2Data { |
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467 wc_tracked, |
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468 p1_tracked, |
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469 p2_info, |
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470 mode_size, |
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471 mtime, |
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472 fallback_exec, |
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473 fallback_symlink, |
49100
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474 })) |
47337
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475 } |
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|
476 |
47334
18b3060fe598
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|
477 pub(super) fn entry( |
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diff
changeset
|
478 &self, |
18b3060fe598
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|
479 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
48139
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480 if self.has_entry() { |
48260
269ff8978086
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diff
changeset
|
481 Ok(Some(self.assume_entry()?)) |
48139
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482 } else { |
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|
483 Ok(None) |
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|
484 } |
47337
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|
485 } |
0654b3b3d2b5
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|
486 |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
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diff
changeset
|
487 pub(super) fn children<'on_disk>( |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
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488 &self, |
0654b3b3d2b5
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|
489 on_disk: &'on_disk [u8], |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
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changeset
|
490 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
47677
da1c0cd68d53
dirstate-v2: shrink on-disk path lengths to 16-bits
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parents:
47676
diff
changeset
|
491 read_nodes(on_disk, self.children) |
47283
2a9ddc8094c7
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diff
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|
492 } |
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|
493 |
2a9ddc8094c7
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diff
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|
494 pub(super) fn to_in_memory_node<'on_disk>( |
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495 &self, |
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|
496 on_disk: &'on_disk [u8], |
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|
497 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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498 Ok(dirstate_map::Node { |
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499 children: dirstate_map::ChildNodes::OnDisk( |
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500 self.children(on_disk)?, |
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501 ), |
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502 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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503 data: self.node_data()?, |
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504 descendants_with_entry_count: self |
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505 .descendants_with_entry_count |
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506 .get(), |
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507 tracked_descendants_count: self.tracked_descendants_count.get(), |
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508 }) |
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509 } |
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510 |
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511 fn from_dirstate_entry( |
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512 entry: &DirstateEntry, |
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513 ) -> (Flags, U32Be, PackedTruncatedTimestamp) { |
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514 let DirstateV2Data { |
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515 wc_tracked, |
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516 p1_tracked, |
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517 p2_info, |
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518 mode_size: mode_size_opt, |
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519 mtime: mtime_opt, |
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520 fallback_exec, |
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521 fallback_symlink, |
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522 } = entry.v2_data(); |
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523 // TODO: convert through raw flag bits instead? |
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524 let mut flags = Flags::empty(); |
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525 flags.set(Flags::WDIR_TRACKED, wc_tracked); |
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526 flags.set(Flags::P1_TRACKED, p1_tracked); |
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527 flags.set(Flags::P2_INFO, p2_info); |
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528 let size = if let Some((m, s)) = mode_size_opt { |
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529 let exec_perm = m & (libc::S_IXUSR as u32) != 0; |
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530 let is_symlink = m & (libc::S_IFMT as u32) == libc::S_IFLNK as u32; |
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531 flags.set(Flags::MODE_EXEC_PERM, exec_perm); |
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532 flags.set(Flags::MODE_IS_SYMLINK, is_symlink); |
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533 flags.insert(Flags::HAS_MODE_AND_SIZE); |
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534 s.into() |
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535 } else { |
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536 0.into() |
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537 }; |
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538 let mtime = if let Some(m) = mtime_opt { |
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539 flags.insert(Flags::HAS_MTIME); |
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540 if m.second_ambiguous { |
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541 flags.insert(Flags::MTIME_SECOND_AMBIGUOUS); |
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542 }; |
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543 m.into() |
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544 } else { |
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545 PackedTruncatedTimestamp::null() |
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546 }; |
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547 if let Some(f_exec) = fallback_exec { |
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548 flags.insert(Flags::HAS_FALLBACK_EXEC); |
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549 if f_exec { |
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550 flags.insert(Flags::FALLBACK_EXEC); |
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551 } |
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552 } |
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553 if let Some(f_symlink) = fallback_symlink { |
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554 flags.insert(Flags::HAS_FALLBACK_SYMLINK); |
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555 if f_symlink { |
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556 flags.insert(Flags::FALLBACK_SYMLINK); |
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557 } |
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558 } |
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559 (flags, size, mtime) |
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560 } |
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561 } |
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562 |
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563 fn read_hg_path( |
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564 on_disk: &[u8], |
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565 slice: PathSlice, |
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566 ) -> Result<&HgPath, DirstateV2ParseError> { |
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567 read_slice(on_disk, slice.start, slice.len.get()).map(HgPath::new) |
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568 } |
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569 |
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570 fn read_nodes( |
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571 on_disk: &[u8], |
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572 slice: ChildNodes, |
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573 ) -> Result<&[Node], DirstateV2ParseError> { |
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574 read_slice(on_disk, slice.start, slice.len.get()) |
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575 } |
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576 |
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577 fn read_slice<T, Len>( |
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578 on_disk: &[u8], |
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579 start: Offset, |
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580 len: Len, |
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581 ) -> Result<&[T], DirstateV2ParseError> |
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582 where |
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583 T: BytesCast, |
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584 Len: TryInto<usize>, |
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585 { |
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586 // Either `usize::MAX` would result in "out of bounds" error since a single |
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587 // `&[u8]` cannot occupy the entire addess space. |
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588 let start = start.get().try_into().unwrap_or(std::usize::MAX); |
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589 let len = len.try_into().unwrap_or(std::usize::MAX); |
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590 let bytes = match on_disk.get(start..) { |
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591 Some(bytes) => bytes, |
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592 None => { |
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593 return Err(DirstateV2ParseError::new( |
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594 "not enough bytes from disk", |
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595 )) |
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596 } |
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597 }; |
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598 T::slice_from_bytes(bytes, len) |
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599 .map_err(|e| { |
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600 DirstateV2ParseError::new(format!("when reading a slice, {}", e)) |
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601 }) |
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602 .map(|(slice, _rest)| slice) |
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603 } |
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604 |
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605 pub(crate) fn for_each_tracked_path<'on_disk>( |
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606 on_disk: &'on_disk [u8], |
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607 metadata: &[u8], |
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608 mut f: impl FnMut(&'on_disk HgPath), |
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609 ) -> Result<(), DirstateV2ParseError> { |
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610 let (meta, _) = TreeMetadata::from_bytes(metadata).map_err(|e| { |
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611 DirstateV2ParseError::new(format!("when parsing tree metadata, {}", e)) |
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612 })?; |
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613 fn recur<'on_disk>( |
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614 on_disk: &'on_disk [u8], |
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615 nodes: ChildNodes, |
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616 f: &mut impl FnMut(&'on_disk HgPath), |
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617 ) -> Result<(), DirstateV2ParseError> { |
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618 for node in read_nodes(on_disk, nodes)? { |
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619 if let Some(entry) = node.entry()? { |
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620 if entry.tracked() { |
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621 f(node.full_path(on_disk)?) |
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622 } |
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623 } |
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624 recur(on_disk, node.children, f)? |
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625 } |
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626 Ok(()) |
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627 } |
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628 recur(on_disk, meta.root_nodes, &mut f) |
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629 } |
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630 |
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631 /// Returns new data and metadata, together with whether that data should be |
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632 /// appended to the existing data file whose content is at |
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633 /// `dirstate_map.on_disk` (true), instead of written to a new data file |
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634 /// (false), and the previous size of data on disk. |
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635 pub(super) fn write( |
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636 dirstate_map: &DirstateMap, |
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637 can_append: bool, |
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638 ) -> Result<(Vec<u8>, TreeMetadata, bool, usize), DirstateError> { |
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639 let append = can_append && dirstate_map.write_should_append(); |
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640 |
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641 // This ignores the space for paths, and for nodes without an entry. |
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642 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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643 let size_guess = std::mem::size_of::<Node>() |
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644 * dirstate_map.nodes_with_entry_count as usize; |
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645 |
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646 let mut writer = Writer { |
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647 dirstate_map, |
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648 append, |
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649 out: Vec::with_capacity(size_guess), |
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650 }; |
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651 |
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652 let root_nodes = writer.write_nodes(dirstate_map.root.as_ref())?; |
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653 |
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654 let unreachable_bytes = if append { |
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655 dirstate_map.unreachable_bytes |
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656 } else { |
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657 0 |
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658 }; |
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659 let meta = TreeMetadata { |
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660 root_nodes, |
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661 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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662 nodes_with_copy_source_count: dirstate_map |
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663 .nodes_with_copy_source_count |
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664 .into(), |
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665 unreachable_bytes: unreachable_bytes.into(), |
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666 unused: [0; 4], |
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667 ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
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668 }; |
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669 Ok((writer.out, meta, append, dirstate_map.old_data_size)) |
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670 } |
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671 |
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672 struct Writer<'dmap, 'on_disk> { |
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673 dirstate_map: &'dmap DirstateMap<'on_disk>, |
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674 append: bool, |
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675 out: Vec<u8>, |
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676 } |
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677 |
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678 impl Writer<'_, '_> { |
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679 fn write_nodes( |
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680 &mut self, |
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681 nodes: dirstate_map::ChildNodesRef, |
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682 ) -> Result<ChildNodes, DirstateError> { |
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683 // Reuse already-written nodes if possible |
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684 if self.append { |
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685 if let dirstate_map::ChildNodesRef::OnDisk(nodes_slice) = nodes { |
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686 let start = self.on_disk_offset_of(nodes_slice).expect( |
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687 "dirstate-v2 OnDisk nodes not found within on_disk", |
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688 ); |
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689 let len = child_nodes_len_from_usize(nodes_slice.len()); |
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690 return Ok(ChildNodes { start, len }); |
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691 } |
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692 } |
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693 |
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694 // `dirstate_map::ChildNodes::InMemory` contains a `HashMap` which has |
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695 // undefined iteration order. Sort to enable binary search in the |
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696 // written file. |
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697 let nodes = nodes.sorted(); |
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698 let nodes_len = nodes.len(); |
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699 |
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700 // First accumulate serialized nodes in a `Vec` |
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701 let mut on_disk_nodes = Vec::with_capacity(nodes_len); |
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702 for node in nodes { |
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703 let children = |
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704 self.write_nodes(node.children(self.dirstate_map.on_disk)?)?; |
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705 let full_path = node.full_path(self.dirstate_map.on_disk)?; |
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706 let full_path = self.write_path(full_path.as_bytes()); |
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707 let copy_source = if let Some(source) = |
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708 node.copy_source(self.dirstate_map.on_disk)? |
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709 { |
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710 self.write_path(source.as_bytes()) |
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711 } else { |
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712 PathSlice { |
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713 start: 0.into(), |
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714 len: 0.into(), |
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715 } |
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716 }; |
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717 on_disk_nodes.push(match node { |
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718 NodeRef::InMemory(path, node) => { |
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719 let (flags, size, mtime) = match &node.data { |
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720 dirstate_map::NodeData::Entry(entry) => { |
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721 Node::from_dirstate_entry(entry) |
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722 } |
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723 dirstate_map::NodeData::CachedDirectory { mtime } => { |
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724 // we currently never set a mtime if unknown file |
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725 // are present. |
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726 // So if we have a mtime for a directory, we know |
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727 // they are no unknown |
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728 // files and we |
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729 // blindly set ALL_UNKNOWN_RECORDED. |
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730 // |
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731 // We never set ALL_IGNORED_RECORDED since we |
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732 // don't track that case |
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733 // currently. |
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734 let mut flags = Flags::DIRECTORY |
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735 | Flags::HAS_MTIME |
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736 | Flags::ALL_UNKNOWN_RECORDED; |
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737 if mtime.second_ambiguous { |
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738 flags.insert(Flags::MTIME_SECOND_AMBIGUOUS) |
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739 } |
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740 (flags, 0.into(), (*mtime).into()) |
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741 } |
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742 dirstate_map::NodeData::None => ( |
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743 Flags::DIRECTORY, |
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744 0.into(), |
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745 PackedTruncatedTimestamp::null(), |
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746 ), |
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747 }; |
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748 Node { |
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749 children, |
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750 copy_source, |
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751 full_path, |
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752 base_name_start: u16::try_from(path.base_name_start()) |
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753 // Could only panic for paths over 64 KiB |
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754 .expect("dirstate-v2 path length overflow") |
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755 .into(), |
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756 descendants_with_entry_count: node |
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757 .descendants_with_entry_count |
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758 .into(), |
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759 tracked_descendants_count: node |
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760 .tracked_descendants_count |
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761 .into(), |
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762 flags: flags.bits().into(), |
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763 size, |
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764 mtime, |
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765 } |
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766 } |
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767 NodeRef::OnDisk(node) => Node { |
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768 children, |
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769 copy_source, |
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770 full_path, |
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771 ..*node |
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772 }, |
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773 }) |
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774 } |
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775 // … so we can write them contiguously, after writing everything else |
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776 // they refer to. |
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777 let start = self.current_offset(); |
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778 let len = child_nodes_len_from_usize(nodes_len); |
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779 self.out.extend(on_disk_nodes.as_bytes()); |
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780 Ok(ChildNodes { start, len }) |
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781 } |
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782 |
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783 /// If the given slice of items is within `on_disk`, returns its offset |
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784 /// from the start of `on_disk`. |
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785 fn on_disk_offset_of<T>(&self, slice: &[T]) -> Option<Offset> |
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786 where |
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787 T: BytesCast, |
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788 { |
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789 fn address_range(slice: &[u8]) -> std::ops::RangeInclusive<usize> { |
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790 let start = slice.as_ptr() as usize; |
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791 let end = start + slice.len(); |
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792 start..=end |
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793 } |
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794 let slice_addresses = address_range(slice.as_bytes()); |
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795 let on_disk_addresses = address_range(self.dirstate_map.on_disk); |
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796 if on_disk_addresses.contains(slice_addresses.start()) |
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797 && on_disk_addresses.contains(slice_addresses.end()) |
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798 { |
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799 let offset = slice_addresses.start() - on_disk_addresses.start(); |
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800 Some(offset_from_usize(offset)) |
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801 } else { |
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802 None |
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803 } |
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804 } |
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805 |
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806 fn current_offset(&mut self) -> Offset { |
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807 let mut offset = self.out.len(); |
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808 if self.append { |
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809 offset += self.dirstate_map.on_disk.len() |
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810 } |
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811 offset_from_usize(offset) |
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812 } |
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813 |
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814 fn write_path(&mut self, slice: &[u8]) -> PathSlice { |
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815 let len = path_len_from_usize(slice.len()); |
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816 // Reuse an already-written path if possible |
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817 if self.append { |
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818 if let Some(start) = self.on_disk_offset_of(slice) { |
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819 return PathSlice { start, len }; |
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820 } |
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821 } |
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822 let start = self.current_offset(); |
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823 self.out.extend(slice.as_bytes()); |
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824 PathSlice { start, len } |
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825 } |
47283
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826 } |
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827 |
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828 fn offset_from_usize(x: usize) -> Offset { |
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829 u32::try_from(x) |
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830 // Could only panic for a dirstate file larger than 4 GiB |
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831 .expect("dirstate-v2 offset overflow") |
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832 .into() |
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833 } |
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834 |
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835 fn child_nodes_len_from_usize(x: usize) -> Size { |
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836 u32::try_from(x) |
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837 // Could only panic with over 4 billion nodes |
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838 .expect("dirstate-v2 slice length overflow") |
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839 .into() |
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840 } |
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841 |
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842 fn path_len_from_usize(x: usize) -> PathSize { |
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843 u16::try_from(x) |
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844 // Could only panic for paths over 64 KiB |
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845 .expect("dirstate-v2 path length overflow") |
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846 .into() |
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847 } |
48219
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848 |
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849 impl From<TruncatedTimestamp> for PackedTruncatedTimestamp { |
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850 fn from(timestamp: TruncatedTimestamp) -> Self { |
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851 Self { |
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852 truncated_seconds: timestamp.truncated_seconds().into(), |
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853 nanoseconds: timestamp.nanoseconds().into(), |
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854 } |
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855 } |
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856 } |
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857 |
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858 impl TryFrom<PackedTruncatedTimestamp> for TruncatedTimestamp { |
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859 type Error = DirstateV2ParseError; |
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860 |
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861 fn try_from( |
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862 timestamp: PackedTruncatedTimestamp, |
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863 ) -> Result<Self, Self::Error> { |
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864 Self::from_already_truncated( |
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865 timestamp.truncated_seconds.get(), |
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866 timestamp.nanoseconds.get(), |
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867 false, |
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868 ) |
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869 } |
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870 } |
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871 impl PackedTruncatedTimestamp { |
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872 fn null() -> Self { |
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873 Self { |
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874 truncated_seconds: 0.into(), |
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875 nanoseconds: 0.into(), |
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876 } |
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877 } |
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878 } |