Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 48196:47fabca85457
dirstate-v2: Name a constant in the Rust implementation
We are about to introduce a Python version of this code that will also need
this constant.
Differential Revision: https://phab.mercurial-scm.org/D11547
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Sun, 03 Oct 2021 13:14:43 +0200 |
parents | 4d5a13253d34 |
children | 308d9c245337 |
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 //! See `mercurial/helptext/internals/dirstate-v2.txt` |
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4 |
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5 use crate::dirstate::TruncatedTimestamp; |
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6 use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef}; |
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7 use crate::dirstate_tree::path_with_basename::WithBasename; |
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8 use crate::errors::HgError; |
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9 use crate::utils::hg_path::HgPath; |
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10 use crate::DirstateEntry; |
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11 use crate::DirstateError; |
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12 use crate::DirstateParents; |
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13 use bitflags::bitflags; |
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14 use bytes_cast::unaligned::{U16Be, U32Be}; |
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15 use bytes_cast::BytesCast; |
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16 use format_bytes::format_bytes; |
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17 use std::borrow::Cow; |
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18 use std::convert::{TryFrom, TryInto}; |
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19 |
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20 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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21 /// This a redundant sanity check more than an actual "magic number" since |
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22 /// `.hg/requires` already governs which format should be used. |
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23 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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24 |
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25 /// Keep space for 256-bit hashes |
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26 const STORED_NODE_ID_BYTES: usize = 32; |
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27 |
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28 /// … even though only 160 bits are used for now, with SHA-1 |
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29 const USED_NODE_ID_BYTES: usize = 20; |
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30 |
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31 pub(super) const IGNORE_PATTERNS_HASH_LEN: usize = 20; |
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32 pub(super) type IgnorePatternsHash = [u8; IGNORE_PATTERNS_HASH_LEN]; |
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33 |
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34 /// Must match the constant of the same name in |
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35 /// `mercurial/dirstateutils/docket.py` |
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36 const TREE_METADATA_SIZE: usize = 44; |
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37 |
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38 const NODE_SIZE: usize = 43; |
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39 |
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40 /// Make sure that size-affecting changes are made knowingly |
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41 #[allow(unused)] |
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42 fn static_assert_size_of() { |
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43 let _ = std::mem::transmute::<TreeMetadata, [u8; TREE_METADATA_SIZE]>; |
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44 let _ = std::mem::transmute::<DocketHeader, [u8; TREE_METADATA_SIZE + 81]>; |
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45 let _ = std::mem::transmute::<Node, [u8; NODE_SIZE]>; |
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46 } |
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47 |
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48 // Must match `HEADER` in `mercurial/dirstateutils/docket.py` |
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49 #[derive(BytesCast)] |
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50 #[repr(C)] |
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51 struct DocketHeader { |
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52 marker: [u8; V2_FORMAT_MARKER.len()], |
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53 parent_1: [u8; STORED_NODE_ID_BYTES], |
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54 parent_2: [u8; STORED_NODE_ID_BYTES], |
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55 |
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56 metadata: TreeMetadata, |
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57 |
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58 /// Counted in bytes |
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59 data_size: Size, |
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60 |
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61 uuid_size: u8, |
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62 } |
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63 |
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64 pub struct Docket<'on_disk> { |
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65 header: &'on_disk DocketHeader, |
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66 uuid: &'on_disk [u8], |
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67 } |
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68 |
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69 /// Fields are documented in the *Tree metadata in the docket file* |
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70 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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71 #[derive(BytesCast)] |
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72 #[repr(C)] |
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73 struct TreeMetadata { |
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74 root_nodes: ChildNodes, |
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75 nodes_with_entry_count: Size, |
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76 nodes_with_copy_source_count: Size, |
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77 unreachable_bytes: Size, |
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78 unused: [u8; 4], |
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79 |
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80 /// See *Optional hash of ignore patterns* section of |
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81 /// `mercurial/helptext/internals/dirstate-v2.txt` |
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82 ignore_patterns_hash: IgnorePatternsHash, |
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83 } |
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84 |
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85 /// Fields are documented in the *The data file format* |
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86 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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87 #[derive(BytesCast)] |
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88 #[repr(C)] |
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89 pub(super) struct Node { |
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90 full_path: PathSlice, |
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91 |
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92 /// In bytes from `self.full_path.start` |
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93 base_name_start: PathSize, |
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94 |
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95 copy_source: OptPathSlice, |
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96 children: ChildNodes, |
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97 pub(super) descendants_with_entry_count: Size, |
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98 pub(super) tracked_descendants_count: Size, |
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99 flags: Flags, |
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100 data: Entry, |
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101 } |
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102 |
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103 bitflags! { |
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104 #[derive(BytesCast)] |
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105 #[repr(C)] |
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106 struct Flags: u8 { |
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107 const WDIR_TRACKED = 1 << 0; |
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108 const P1_TRACKED = 1 << 1; |
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109 const P2_INFO = 1 << 2; |
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110 const HAS_MODE_AND_SIZE = 1 << 3; |
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111 const HAS_MTIME = 1 << 4; |
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112 const MODE_EXEC_PERM = 1 << 5; |
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113 const MODE_IS_SYMLINK = 1 << 7; |
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114 } |
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115 } |
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116 |
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117 #[derive(BytesCast, Copy, Clone, Debug)] |
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118 #[repr(C)] |
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119 struct Entry { |
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120 _padding: U32Be, |
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121 size: U32Be, |
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122 mtime: U32Be, |
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123 } |
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124 |
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125 /// Duration since the Unix epoch |
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126 #[derive(BytesCast, Copy, Clone)] |
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127 #[repr(C)] |
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128 struct PackedTimestamp { |
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129 _padding: U32Be, |
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130 truncated_seconds: U32Be, |
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131 nanoseconds: U32Be, |
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132 } |
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133 |
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134 /// Counted in bytes from the start of the file |
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135 /// |
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136 /// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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137 type Offset = U32Be; |
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138 |
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139 /// Counted in number of items |
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140 /// |
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141 /// NOTE: we choose not to support counting more than 4 billion nodes anywhere. |
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142 type Size = U32Be; |
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143 |
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144 /// Counted in bytes |
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145 /// |
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146 /// NOTE: we choose not to support file names/paths longer than 64 KiB. |
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147 type PathSize = U16Be; |
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148 |
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149 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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150 /// of either some other node or of the repository root. |
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151 /// |
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152 /// Always sorted by ascending `full_path`, to allow binary search. |
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153 /// Since nodes with the same parent nodes also have the same parent path, |
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154 /// only the `base_name`s need to be compared during binary search. |
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155 #[derive(BytesCast, Copy, Clone)] |
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156 #[repr(C)] |
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157 struct ChildNodes { |
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158 start: Offset, |
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159 len: Size, |
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160 } |
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161 |
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162 /// A `HgPath` of `len` bytes |
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163 #[derive(BytesCast, Copy, Clone)] |
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164 #[repr(C)] |
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165 struct PathSlice { |
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166 start: Offset, |
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167 len: PathSize, |
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168 } |
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169 |
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170 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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171 type OptPathSlice = PathSlice; |
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172 |
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173 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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174 /// |
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175 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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176 #[derive(Debug)] |
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177 pub struct DirstateV2ParseError; |
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178 |
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179 impl From<DirstateV2ParseError> for HgError { |
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180 fn from(_: DirstateV2ParseError) -> Self { |
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181 HgError::corrupted("dirstate-v2 parse error") |
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182 } |
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183 } |
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184 |
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185 impl From<DirstateV2ParseError> for crate::DirstateError { |
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186 fn from(error: DirstateV2ParseError) -> Self { |
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187 HgError::from(error).into() |
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188 } |
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189 } |
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190 |
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191 impl<'on_disk> Docket<'on_disk> { |
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192 pub fn parents(&self) -> DirstateParents { |
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193 use crate::Node; |
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194 let p1 = Node::try_from(&self.header.parent_1[..USED_NODE_ID_BYTES]) |
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195 .unwrap() |
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196 .clone(); |
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197 let p2 = Node::try_from(&self.header.parent_2[..USED_NODE_ID_BYTES]) |
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198 .unwrap() |
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199 .clone(); |
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200 DirstateParents { p1, p2 } |
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201 } |
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202 |
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203 pub fn tree_metadata(&self) -> &[u8] { |
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204 self.header.metadata.as_bytes() |
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205 } |
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206 |
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207 pub fn data_size(&self) -> usize { |
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208 // This `unwrap` could only panic on a 16-bit CPU |
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209 self.header.data_size.get().try_into().unwrap() |
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210 } |
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211 |
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212 pub fn data_filename(&self) -> String { |
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213 String::from_utf8(format_bytes!(b"dirstate.{}", self.uuid)).unwrap() |
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214 } |
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215 } |
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216 |
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217 pub fn read_docket( |
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218 on_disk: &[u8], |
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219 ) -> Result<Docket<'_>, DirstateV2ParseError> { |
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220 let (header, uuid) = |
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221 DocketHeader::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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222 let uuid_size = header.uuid_size as usize; |
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223 if header.marker == *V2_FORMAT_MARKER && uuid.len() == uuid_size { |
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224 Ok(Docket { header, uuid }) |
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225 } else { |
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226 Err(DirstateV2ParseError) |
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227 } |
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228 } |
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229 |
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230 pub(super) fn read<'on_disk>( |
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231 on_disk: &'on_disk [u8], |
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232 metadata: &[u8], |
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233 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> { |
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234 if on_disk.is_empty() { |
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235 return Ok(DirstateMap::empty(on_disk)); |
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236 } |
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237 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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238 .map_err(|_| DirstateV2ParseError)?; |
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239 let dirstate_map = DirstateMap { |
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240 on_disk, |
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241 root: dirstate_map::ChildNodes::OnDisk(read_nodes( |
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242 on_disk, |
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243 meta.root_nodes, |
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244 )?), |
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245 nodes_with_entry_count: meta.nodes_with_entry_count.get(), |
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246 nodes_with_copy_source_count: meta.nodes_with_copy_source_count.get(), |
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247 ignore_patterns_hash: meta.ignore_patterns_hash, |
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248 unreachable_bytes: meta.unreachable_bytes.get(), |
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249 }; |
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250 Ok(dirstate_map) |
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251 } |
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252 |
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253 impl Node { |
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254 pub(super) fn full_path<'on_disk>( |
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255 &self, |
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256 on_disk: &'on_disk [u8], |
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257 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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258 read_hg_path(on_disk, self.full_path) |
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259 } |
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260 |
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261 pub(super) fn base_name_start<'on_disk>( |
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262 &self, |
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263 ) -> Result<usize, DirstateV2ParseError> { |
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264 let start = self.base_name_start.get(); |
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265 if start < self.full_path.len.get() { |
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266 let start = usize::try_from(start) |
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267 // u32 -> usize, could only panic on a 16-bit CPU |
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268 .expect("dirstate-v2 base_name_start out of bounds"); |
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269 Ok(start) |
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270 } else { |
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271 Err(DirstateV2ParseError) |
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272 } |
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273 } |
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274 |
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275 pub(super) fn base_name<'on_disk>( |
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276 &self, |
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277 on_disk: &'on_disk [u8], |
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278 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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279 let full_path = self.full_path(on_disk)?; |
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280 let base_name_start = self.base_name_start()?; |
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281 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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282 } |
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283 |
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284 pub(super) fn path<'on_disk>( |
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285 &self, |
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286 on_disk: &'on_disk [u8], |
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287 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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288 Ok(WithBasename::from_raw_parts( |
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289 Cow::Borrowed(self.full_path(on_disk)?), |
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290 self.base_name_start()?, |
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291 )) |
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292 } |
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293 |
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294 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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295 self.copy_source.start.get() != 0 |
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296 } |
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297 |
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298 pub(super) fn copy_source<'on_disk>( |
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299 &self, |
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300 on_disk: &'on_disk [u8], |
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301 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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302 Ok(if self.has_copy_source() { |
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303 Some(read_hg_path(on_disk, self.copy_source)?) |
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304 } else { |
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305 None |
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306 }) |
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307 } |
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308 |
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309 fn has_entry(&self) -> bool { |
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310 self.flags.intersects( |
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311 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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312 ) |
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313 } |
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314 |
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315 pub(super) fn node_data( |
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316 &self, |
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317 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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318 if self.has_entry() { |
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319 Ok(dirstate_map::NodeData::Entry(self.assume_entry())) |
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320 } else if let Some(mtime) = self.cached_directory_mtime()? { |
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321 Ok(dirstate_map::NodeData::CachedDirectory { mtime }) |
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322 } else { |
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323 Ok(dirstate_map::NodeData::None) |
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324 } |
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325 } |
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326 |
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327 pub(super) fn cached_directory_mtime( |
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328 &self, |
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329 ) -> Result<Option<TruncatedTimestamp>, DirstateV2ParseError> { |
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330 Ok( |
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331 if self.flags.contains(Flags::HAS_MTIME) && !self.has_entry() { |
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332 Some(self.data.as_timestamp()?) |
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333 } else { |
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334 None |
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335 }, |
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336 ) |
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337 } |
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338 |
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339 fn synthesize_unix_mode(&self) -> u32 { |
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340 let file_type = if self.flags.contains(Flags::MODE_IS_SYMLINK) { |
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341 libc::S_IFLNK |
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342 } else { |
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343 libc::S_IFREG |
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344 }; |
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345 let permisions = if self.flags.contains(Flags::MODE_EXEC_PERM) { |
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346 0o755 |
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347 } else { |
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348 0o644 |
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349 }; |
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350 file_type | permisions |
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351 } |
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352 |
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353 fn assume_entry(&self) -> DirstateEntry { |
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354 // TODO: convert through raw bits instead? |
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355 let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED); |
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356 let p1_tracked = self.flags.contains(Flags::P1_TRACKED); |
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357 let p2_info = self.flags.contains(Flags::P2_INFO); |
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358 let mode_size = if self.flags.contains(Flags::HAS_MODE_AND_SIZE) { |
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359 Some((self.synthesize_unix_mode(), self.data.size.into())) |
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360 } else { |
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361 None |
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362 }; |
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363 let mtime = if self.flags.contains(Flags::HAS_MTIME) { |
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364 Some(self.data.mtime.into()) |
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365 } else { |
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366 None |
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367 }; |
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368 DirstateEntry::from_v2_data( |
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369 wdir_tracked, |
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370 p1_tracked, |
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371 p2_info, |
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372 mode_size, |
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373 mtime, |
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374 ) |
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375 } |
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376 |
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377 pub(super) fn entry( |
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378 &self, |
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379 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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380 if self.has_entry() { |
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381 Ok(Some(self.assume_entry())) |
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382 } else { |
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383 Ok(None) |
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384 } |
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385 } |
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386 |
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387 pub(super) fn children<'on_disk>( |
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388 &self, |
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389 on_disk: &'on_disk [u8], |
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390 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
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391 read_nodes(on_disk, self.children) |
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392 } |
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393 |
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394 pub(super) fn to_in_memory_node<'on_disk>( |
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395 &self, |
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396 on_disk: &'on_disk [u8], |
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397 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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398 Ok(dirstate_map::Node { |
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399 children: dirstate_map::ChildNodes::OnDisk( |
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400 self.children(on_disk)?, |
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401 ), |
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402 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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403 data: self.node_data()?, |
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404 descendants_with_entry_count: self |
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405 .descendants_with_entry_count |
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406 .get(), |
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407 tracked_descendants_count: self.tracked_descendants_count.get(), |
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408 }) |
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409 } |
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410 } |
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411 |
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412 impl Entry { |
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413 fn from_dirstate_entry(entry: &DirstateEntry) -> (Flags, Self) { |
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414 let (wdir_tracked, p1_tracked, p2_info, mode_size_opt, mtime_opt) = |
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415 entry.v2_data(); |
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416 // TODO: convert throug raw flag bits instead? |
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417 let mut flags = Flags::empty(); |
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418 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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419 flags.set(Flags::P1_TRACKED, p1_tracked); |
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420 flags.set(Flags::P2_INFO, p2_info); |
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421 let (size, mtime); |
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422 if let Some((m, s)) = mode_size_opt { |
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423 let exec_perm = m & libc::S_IXUSR != 0; |
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424 let is_symlink = m & libc::S_IFMT == libc::S_IFLNK; |
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425 flags.set(Flags::MODE_EXEC_PERM, exec_perm); |
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426 flags.set(Flags::MODE_IS_SYMLINK, is_symlink); |
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427 size = s; |
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428 flags.insert(Flags::HAS_MODE_AND_SIZE) |
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429 } else { |
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430 size = 0; |
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431 } |
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432 if let Some(m) = mtime_opt { |
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433 mtime = m; |
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434 flags.insert(Flags::HAS_MTIME); |
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435 } else { |
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436 mtime = 0; |
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437 } |
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438 let raw_entry = Entry { |
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439 _padding: 0.into(), |
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440 size: size.into(), |
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441 mtime: mtime.into(), |
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442 }; |
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443 (flags, raw_entry) |
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444 } |
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445 |
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446 fn from_timestamp(timestamp: TruncatedTimestamp) -> Self { |
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447 let packed = PackedTimestamp { |
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448 _padding: 0.into(), |
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449 truncated_seconds: timestamp.truncated_seconds().into(), |
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450 nanoseconds: timestamp.nanoseconds().into(), |
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451 }; |
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452 // Safety: both types implement the `ByteCast` trait, so we could |
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453 // safely use `as_bytes` and `from_bytes` to do this conversion. Using |
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454 // `transmute` instead makes the compiler check that the two types |
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455 // have the same size, which eliminates the error case of |
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456 // `from_bytes`. |
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457 unsafe { std::mem::transmute::<PackedTimestamp, Entry>(packed) } |
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458 } |
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459 |
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460 fn as_timestamp(self) -> Result<TruncatedTimestamp, DirstateV2ParseError> { |
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461 // Safety: same as above in `from_timestamp` |
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462 let packed = |
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463 unsafe { std::mem::transmute::<Entry, PackedTimestamp>(self) }; |
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464 TruncatedTimestamp::from_already_truncated( |
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465 packed.truncated_seconds.get(), |
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466 packed.nanoseconds.get(), |
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467 ) |
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468 } |
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469 } |
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470 |
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471 fn read_hg_path( |
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472 on_disk: &[u8], |
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473 slice: PathSlice, |
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474 ) -> Result<&HgPath, DirstateV2ParseError> { |
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475 read_slice(on_disk, slice.start, slice.len.get()).map(HgPath::new) |
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476 } |
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477 |
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478 fn read_nodes( |
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479 on_disk: &[u8], |
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480 slice: ChildNodes, |
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481 ) -> Result<&[Node], DirstateV2ParseError> { |
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482 read_slice(on_disk, slice.start, slice.len.get()) |
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483 } |
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484 |
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485 fn read_slice<T, Len>( |
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486 on_disk: &[u8], |
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487 start: Offset, |
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488 len: Len, |
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489 ) -> Result<&[T], DirstateV2ParseError> |
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490 where |
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491 T: BytesCast, |
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492 Len: TryInto<usize>, |
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493 { |
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494 // Either `usize::MAX` would result in "out of bounds" error since a single |
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495 // `&[u8]` cannot occupy the entire addess space. |
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496 let start = start.get().try_into().unwrap_or(std::usize::MAX); |
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497 let len = len.try_into().unwrap_or(std::usize::MAX); |
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498 on_disk |
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499 .get(start..) |
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500 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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501 .map(|(slice, _rest)| slice) |
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502 .ok_or_else(|| DirstateV2ParseError) |
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503 } |
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504 |
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505 pub(crate) fn for_each_tracked_path<'on_disk>( |
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506 on_disk: &'on_disk [u8], |
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507 metadata: &[u8], |
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508 mut f: impl FnMut(&'on_disk HgPath), |
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509 ) -> Result<(), DirstateV2ParseError> { |
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510 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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511 .map_err(|_| DirstateV2ParseError)?; |
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512 fn recur<'on_disk>( |
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513 on_disk: &'on_disk [u8], |
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514 nodes: ChildNodes, |
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515 f: &mut impl FnMut(&'on_disk HgPath), |
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516 ) -> Result<(), DirstateV2ParseError> { |
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517 for node in read_nodes(on_disk, nodes)? { |
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518 if let Some(entry) = node.entry()? { |
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519 if entry.state().is_tracked() { |
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520 f(node.full_path(on_disk)?) |
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521 } |
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522 } |
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523 recur(on_disk, node.children, f)? |
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524 } |
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525 Ok(()) |
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526 } |
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527 recur(on_disk, meta.root_nodes, &mut f) |
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528 } |
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529 |
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530 /// Returns new data and metadata, together with whether that data should be |
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531 /// appended to the existing data file whose content is at |
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532 /// `dirstate_map.on_disk` (true), instead of written to a new data file |
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533 /// (false). |
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534 pub(super) fn write( |
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535 dirstate_map: &mut DirstateMap, |
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536 can_append: bool, |
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537 ) -> Result<(Vec<u8>, Vec<u8>, bool), DirstateError> { |
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538 let append = can_append && dirstate_map.write_should_append(); |
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539 |
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540 // This ignores the space for paths, and for nodes without an entry. |
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541 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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542 let size_guess = std::mem::size_of::<Node>() |
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543 * dirstate_map.nodes_with_entry_count as usize; |
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544 |
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545 let mut writer = Writer { |
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546 dirstate_map, |
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547 append, |
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548 out: Vec::with_capacity(size_guess), |
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549 }; |
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550 |
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551 let root_nodes = writer.write_nodes(dirstate_map.root.as_ref())?; |
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552 |
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553 let meta = TreeMetadata { |
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554 root_nodes, |
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555 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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556 nodes_with_copy_source_count: dirstate_map |
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557 .nodes_with_copy_source_count |
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558 .into(), |
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559 unreachable_bytes: dirstate_map.unreachable_bytes.into(), |
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560 unused: [0; 4], |
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561 ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
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562 }; |
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563 Ok((writer.out, meta.as_bytes().to_vec(), append)) |
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564 } |
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565 |
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566 struct Writer<'dmap, 'on_disk> { |
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567 dirstate_map: &'dmap DirstateMap<'on_disk>, |
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568 append: bool, |
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569 out: Vec<u8>, |
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570 } |
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571 |
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572 impl Writer<'_, '_> { |
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573 fn write_nodes( |
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574 &mut self, |
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575 nodes: dirstate_map::ChildNodesRef, |
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576 ) -> Result<ChildNodes, DirstateError> { |
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577 // Reuse already-written nodes if possible |
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578 if self.append { |
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579 if let dirstate_map::ChildNodesRef::OnDisk(nodes_slice) = nodes { |
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580 let start = self.on_disk_offset_of(nodes_slice).expect( |
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581 "dirstate-v2 OnDisk nodes not found within on_disk", |
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582 ); |
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583 let len = child_nodes_len_from_usize(nodes_slice.len()); |
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584 return Ok(ChildNodes { start, len }); |
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585 } |
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586 } |
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587 |
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588 // `dirstate_map::ChildNodes::InMemory` contains a `HashMap` which has |
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589 // undefined iteration order. Sort to enable binary search in the |
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590 // written file. |
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591 let nodes = nodes.sorted(); |
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592 let nodes_len = nodes.len(); |
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593 |
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594 // First accumulate serialized nodes in a `Vec` |
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595 let mut on_disk_nodes = Vec::with_capacity(nodes_len); |
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596 for node in nodes { |
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597 let children = |
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598 self.write_nodes(node.children(self.dirstate_map.on_disk)?)?; |
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599 let full_path = node.full_path(self.dirstate_map.on_disk)?; |
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600 let full_path = self.write_path(full_path.as_bytes()); |
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601 let copy_source = if let Some(source) = |
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602 node.copy_source(self.dirstate_map.on_disk)? |
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603 { |
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604 self.write_path(source.as_bytes()) |
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605 } else { |
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606 PathSlice { |
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607 start: 0.into(), |
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608 len: 0.into(), |
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609 } |
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610 }; |
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611 on_disk_nodes.push(match node { |
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612 NodeRef::InMemory(path, node) => { |
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613 let (flags, data) = match &node.data { |
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614 dirstate_map::NodeData::Entry(entry) => { |
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615 Entry::from_dirstate_entry(entry) |
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616 } |
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617 dirstate_map::NodeData::CachedDirectory { mtime } => { |
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618 (Flags::HAS_MTIME, Entry::from_timestamp(*mtime)) |
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619 } |
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620 dirstate_map::NodeData::None => ( |
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621 Flags::empty(), |
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622 Entry { |
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623 _padding: 0.into(), |
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624 size: 0.into(), |
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625 mtime: 0.into(), |
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626 }, |
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627 ), |
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628 }; |
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629 Node { |
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630 children, |
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631 copy_source, |
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632 full_path, |
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633 base_name_start: u16::try_from(path.base_name_start()) |
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634 // Could only panic for paths over 64 KiB |
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635 .expect("dirstate-v2 path length overflow") |
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636 .into(), |
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637 descendants_with_entry_count: node |
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638 .descendants_with_entry_count |
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639 .into(), |
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640 tracked_descendants_count: node |
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641 .tracked_descendants_count |
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642 .into(), |
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643 flags, |
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644 data, |
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645 } |
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646 } |
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647 NodeRef::OnDisk(node) => Node { |
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648 children, |
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649 copy_source, |
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650 full_path, |
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651 ..*node |
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652 }, |
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653 }) |
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654 } |
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655 // … so we can write them contiguously, after writing everything else |
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656 // they refer to. |
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657 let start = self.current_offset(); |
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658 let len = child_nodes_len_from_usize(nodes_len); |
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659 self.out.extend(on_disk_nodes.as_bytes()); |
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660 Ok(ChildNodes { start, len }) |
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661 } |
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662 |
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663 /// If the given slice of items is within `on_disk`, returns its offset |
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664 /// from the start of `on_disk`. |
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665 fn on_disk_offset_of<T>(&self, slice: &[T]) -> Option<Offset> |
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666 where |
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667 T: BytesCast, |
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668 { |
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669 fn address_range(slice: &[u8]) -> std::ops::RangeInclusive<usize> { |
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670 let start = slice.as_ptr() as usize; |
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671 let end = start + slice.len(); |
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672 start..=end |
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673 } |
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674 let slice_addresses = address_range(slice.as_bytes()); |
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675 let on_disk_addresses = address_range(self.dirstate_map.on_disk); |
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676 if on_disk_addresses.contains(slice_addresses.start()) |
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677 && on_disk_addresses.contains(slice_addresses.end()) |
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678 { |
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679 let offset = slice_addresses.start() - on_disk_addresses.start(); |
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680 Some(offset_from_usize(offset)) |
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681 } else { |
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682 None |
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683 } |
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684 } |
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685 |
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686 fn current_offset(&mut self) -> Offset { |
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687 let mut offset = self.out.len(); |
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688 if self.append { |
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689 offset += self.dirstate_map.on_disk.len() |
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690 } |
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691 offset_from_usize(offset) |
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692 } |
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693 |
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694 fn write_path(&mut self, slice: &[u8]) -> PathSlice { |
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695 let len = path_len_from_usize(slice.len()); |
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696 // Reuse an already-written path if possible |
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697 if self.append { |
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698 if let Some(start) = self.on_disk_offset_of(slice) { |
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699 return PathSlice { start, len }; |
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700 } |
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701 } |
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702 let start = self.current_offset(); |
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703 self.out.extend(slice.as_bytes()); |
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704 PathSlice { start, len } |
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705 } |
47283
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706 } |
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707 |
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708 fn offset_from_usize(x: usize) -> Offset { |
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709 u32::try_from(x) |
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710 // Could only panic for a dirstate file larger than 4 GiB |
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711 .expect("dirstate-v2 offset overflow") |
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712 .into() |
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713 } |
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714 |
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715 fn child_nodes_len_from_usize(x: usize) -> Size { |
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716 u32::try_from(x) |
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717 // Could only panic with over 4 billion nodes |
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718 .expect("dirstate-v2 slice length overflow") |
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719 .into() |
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720 } |
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721 |
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722 fn path_len_from_usize(x: usize) -> PathSize { |
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723 u16::try_from(x) |
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724 // Could only panic for paths over 64 KiB |
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725 .expect("dirstate-v2 path length overflow") |
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726 .into() |
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727 } |