Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 48250:1730b2fceaa1
dirstate-v2: adds a flag to mark a file as modified
Right now, a files with a file system state that requires a lookup (same size,
different mtime) will requires a lookup. If the result of that lookup is a
modified files, it will remains ambiguous, requiring a lookup on the next status
run too.
To fix this, we introduce a dedicated flag in the new format. Such flag will
allow to record such file as "known modified" avoiding an extra lookup later.
As None of the associate code currently exist in the status code, we do the
minimal implementation: if we read a dirstate entry with this flag set, we make
it as "ambiguous" so that the next status code has to look it up. The same as it
would have to without this flag existing anyway.
Differential Revision: https://phab.mercurial-scm.org/D11681
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 15 Oct 2021 16:12:00 +0200 |
parents | f7fd629ffb98 |
children | dfc5a505ddc5 |
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 constants of the same names in `mercurial/dirstateutils/v2.py` |
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35 const TREE_METADATA_SIZE: usize = 44; |
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36 const NODE_SIZE: usize = 44; |
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37 |
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38 /// Make sure that size-affecting changes are made knowingly |
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39 #[allow(unused)] |
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40 fn static_assert_size_of() { |
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41 let _ = std::mem::transmute::<TreeMetadata, [u8; TREE_METADATA_SIZE]>; |
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42 let _ = std::mem::transmute::<DocketHeader, [u8; TREE_METADATA_SIZE + 81]>; |
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43 let _ = std::mem::transmute::<Node, [u8; NODE_SIZE]>; |
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44 } |
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45 |
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46 // Must match `HEADER` in `mercurial/dirstateutils/docket.py` |
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47 #[derive(BytesCast)] |
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48 #[repr(C)] |
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49 struct DocketHeader { |
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50 marker: [u8; V2_FORMAT_MARKER.len()], |
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51 parent_1: [u8; STORED_NODE_ID_BYTES], |
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52 parent_2: [u8; STORED_NODE_ID_BYTES], |
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53 |
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54 metadata: TreeMetadata, |
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55 |
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56 /// Counted in bytes |
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57 data_size: Size, |
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58 |
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59 uuid_size: u8, |
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60 } |
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61 |
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62 pub struct Docket<'on_disk> { |
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63 header: &'on_disk DocketHeader, |
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64 uuid: &'on_disk [u8], |
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65 } |
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66 |
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67 /// Fields are documented in the *Tree metadata in the docket file* |
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68 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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69 #[derive(BytesCast)] |
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70 #[repr(C)] |
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71 struct TreeMetadata { |
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72 root_nodes: ChildNodes, |
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73 nodes_with_entry_count: Size, |
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74 nodes_with_copy_source_count: Size, |
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75 unreachable_bytes: Size, |
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76 unused: [u8; 4], |
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77 |
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78 /// See *Optional hash of ignore patterns* section of |
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79 /// `mercurial/helptext/internals/dirstate-v2.txt` |
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80 ignore_patterns_hash: IgnorePatternsHash, |
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81 } |
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82 |
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83 /// Fields are documented in the *The data file format* |
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84 /// section of `mercurial/helptext/internals/dirstate-v2.txt` |
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85 #[derive(BytesCast)] |
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86 #[repr(C)] |
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87 pub(super) struct Node { |
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88 full_path: PathSlice, |
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89 |
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90 /// In bytes from `self.full_path.start` |
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91 base_name_start: PathSize, |
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92 |
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93 copy_source: OptPathSlice, |
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94 children: ChildNodes, |
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95 pub(super) descendants_with_entry_count: Size, |
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96 pub(super) tracked_descendants_count: Size, |
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97 flags: U16Be, |
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98 size: U32Be, |
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99 mtime: PackedTruncatedTimestamp, |
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100 } |
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101 |
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102 bitflags! { |
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103 #[repr(C)] |
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104 struct Flags: u16 { |
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105 const WDIR_TRACKED = 1 << 0; |
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106 const P1_TRACKED = 1 << 1; |
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107 const P2_INFO = 1 << 2; |
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108 const HAS_MODE_AND_SIZE = 1 << 3; |
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109 const HAS_FILE_MTIME = 1 << 4; |
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110 const HAS_DIRECTORY_MTIME = 1 << 5; |
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111 const MODE_EXEC_PERM = 1 << 6; |
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112 const MODE_IS_SYMLINK = 1 << 7; |
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113 const EXPECTED_STATE_IS_MODIFIED = 1 << 8; |
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114 } |
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115 } |
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116 |
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117 /// Duration since the Unix epoch |
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118 #[derive(BytesCast, Copy, Clone)] |
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119 #[repr(C)] |
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120 struct PackedTruncatedTimestamp { |
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121 truncated_seconds: U32Be, |
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122 nanoseconds: U32Be, |
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123 } |
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124 |
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125 /// Counted in bytes from the start of the file |
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126 /// |
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127 /// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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128 type Offset = U32Be; |
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129 |
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130 /// Counted in number of items |
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131 /// |
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132 /// NOTE: we choose not to support counting more than 4 billion nodes anywhere. |
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133 type Size = U32Be; |
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134 |
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135 /// Counted in bytes |
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136 /// |
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137 /// NOTE: we choose not to support file names/paths longer than 64 KiB. |
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138 type PathSize = U16Be; |
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139 |
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140 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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141 /// of either some other node or of the repository root. |
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142 /// |
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143 /// Always sorted by ascending `full_path`, to allow binary search. |
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144 /// Since nodes with the same parent nodes also have the same parent path, |
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145 /// only the `base_name`s need to be compared during binary search. |
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146 #[derive(BytesCast, Copy, Clone)] |
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147 #[repr(C)] |
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148 struct ChildNodes { |
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149 start: Offset, |
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150 len: Size, |
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151 } |
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152 |
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153 /// A `HgPath` of `len` bytes |
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154 #[derive(BytesCast, Copy, Clone)] |
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155 #[repr(C)] |
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156 struct PathSlice { |
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157 start: Offset, |
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158 len: PathSize, |
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159 } |
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160 |
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161 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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162 type OptPathSlice = PathSlice; |
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163 |
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164 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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165 /// |
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166 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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167 #[derive(Debug)] |
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168 pub struct DirstateV2ParseError; |
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169 |
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170 impl From<DirstateV2ParseError> for HgError { |
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171 fn from(_: DirstateV2ParseError) -> Self { |
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172 HgError::corrupted("dirstate-v2 parse error") |
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173 } |
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174 } |
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175 |
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176 impl From<DirstateV2ParseError> for crate::DirstateError { |
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177 fn from(error: DirstateV2ParseError) -> Self { |
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178 HgError::from(error).into() |
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179 } |
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180 } |
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181 |
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182 impl<'on_disk> Docket<'on_disk> { |
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183 pub fn parents(&self) -> DirstateParents { |
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184 use crate::Node; |
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185 let p1 = Node::try_from(&self.header.parent_1[..USED_NODE_ID_BYTES]) |
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186 .unwrap() |
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187 .clone(); |
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188 let p2 = Node::try_from(&self.header.parent_2[..USED_NODE_ID_BYTES]) |
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189 .unwrap() |
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190 .clone(); |
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191 DirstateParents { p1, p2 } |
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192 } |
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193 |
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194 pub fn tree_metadata(&self) -> &[u8] { |
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195 self.header.metadata.as_bytes() |
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196 } |
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197 |
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198 pub fn data_size(&self) -> usize { |
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199 // This `unwrap` could only panic on a 16-bit CPU |
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200 self.header.data_size.get().try_into().unwrap() |
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201 } |
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202 |
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203 pub fn data_filename(&self) -> String { |
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204 String::from_utf8(format_bytes!(b"dirstate.{}", self.uuid)).unwrap() |
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205 } |
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206 } |
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207 |
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208 pub fn read_docket( |
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209 on_disk: &[u8], |
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210 ) -> Result<Docket<'_>, DirstateV2ParseError> { |
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211 let (header, uuid) = |
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212 DocketHeader::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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213 let uuid_size = header.uuid_size as usize; |
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214 if header.marker == *V2_FORMAT_MARKER && uuid.len() == uuid_size { |
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215 Ok(Docket { header, uuid }) |
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216 } else { |
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217 Err(DirstateV2ParseError) |
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218 } |
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219 } |
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220 |
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221 pub(super) fn read<'on_disk>( |
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222 on_disk: &'on_disk [u8], |
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223 metadata: &[u8], |
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224 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> { |
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225 if on_disk.is_empty() { |
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226 return Ok(DirstateMap::empty(on_disk)); |
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227 } |
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228 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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229 .map_err(|_| DirstateV2ParseError)?; |
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230 let dirstate_map = DirstateMap { |
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231 on_disk, |
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232 root: dirstate_map::ChildNodes::OnDisk(read_nodes( |
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233 on_disk, |
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234 meta.root_nodes, |
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235 )?), |
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236 nodes_with_entry_count: meta.nodes_with_entry_count.get(), |
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237 nodes_with_copy_source_count: meta.nodes_with_copy_source_count.get(), |
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238 ignore_patterns_hash: meta.ignore_patterns_hash, |
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239 unreachable_bytes: meta.unreachable_bytes.get(), |
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240 }; |
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241 Ok(dirstate_map) |
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242 } |
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243 |
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244 impl Node { |
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245 pub(super) fn full_path<'on_disk>( |
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246 &self, |
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247 on_disk: &'on_disk [u8], |
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248 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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249 read_hg_path(on_disk, self.full_path) |
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250 } |
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251 |
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252 pub(super) fn base_name_start<'on_disk>( |
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253 &self, |
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254 ) -> Result<usize, DirstateV2ParseError> { |
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255 let start = self.base_name_start.get(); |
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256 if start < self.full_path.len.get() { |
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257 let start = usize::try_from(start) |
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258 // u32 -> usize, could only panic on a 16-bit CPU |
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259 .expect("dirstate-v2 base_name_start out of bounds"); |
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260 Ok(start) |
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261 } else { |
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262 Err(DirstateV2ParseError) |
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263 } |
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264 } |
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265 |
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266 pub(super) fn base_name<'on_disk>( |
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267 &self, |
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268 on_disk: &'on_disk [u8], |
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269 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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270 let full_path = self.full_path(on_disk)?; |
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271 let base_name_start = self.base_name_start()?; |
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272 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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273 } |
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274 |
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275 pub(super) fn path<'on_disk>( |
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276 &self, |
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277 on_disk: &'on_disk [u8], |
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278 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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279 Ok(WithBasename::from_raw_parts( |
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280 Cow::Borrowed(self.full_path(on_disk)?), |
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281 self.base_name_start()?, |
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282 )) |
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283 } |
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284 |
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285 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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286 self.copy_source.start.get() != 0 |
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287 } |
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288 |
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289 pub(super) fn copy_source<'on_disk>( |
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290 &self, |
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291 on_disk: &'on_disk [u8], |
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292 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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293 Ok(if self.has_copy_source() { |
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294 Some(read_hg_path(on_disk, self.copy_source)?) |
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295 } else { |
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296 None |
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297 }) |
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298 } |
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299 |
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300 fn flags(&self) -> Flags { |
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301 Flags::from_bits_truncate(self.flags.get()) |
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302 } |
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303 |
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304 fn has_entry(&self) -> bool { |
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305 self.flags().intersects( |
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306 Flags::WDIR_TRACKED | Flags::P1_TRACKED | Flags::P2_INFO, |
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307 ) |
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308 } |
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309 |
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310 pub(super) fn node_data( |
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311 &self, |
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312 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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313 if self.has_entry() { |
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314 Ok(dirstate_map::NodeData::Entry(self.assume_entry())) |
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315 } else if let Some(mtime) = self.cached_directory_mtime()? { |
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316 Ok(dirstate_map::NodeData::CachedDirectory { mtime }) |
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317 } else { |
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318 Ok(dirstate_map::NodeData::None) |
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319 } |
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320 } |
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321 |
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322 pub(super) fn cached_directory_mtime( |
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323 &self, |
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324 ) -> Result<Option<TruncatedTimestamp>, DirstateV2ParseError> { |
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325 if self.flags().contains(Flags::HAS_DIRECTORY_MTIME) { |
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326 if self.flags().contains(Flags::HAS_FILE_MTIME) { |
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327 Err(DirstateV2ParseError) |
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328 } else { |
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329 Ok(Some(self.mtime.try_into()?)) |
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330 } |
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331 } else { |
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332 Ok(None) |
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333 } |
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334 } |
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335 |
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336 fn synthesize_unix_mode(&self) -> u32 { |
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337 let file_type = if self.flags().contains(Flags::MODE_IS_SYMLINK) { |
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338 libc::S_IFLNK |
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339 } else { |
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340 libc::S_IFREG |
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341 }; |
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342 let permisions = if self.flags().contains(Flags::MODE_EXEC_PERM) { |
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343 0o755 |
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344 } else { |
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345 0o644 |
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346 }; |
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347 file_type | permisions |
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348 } |
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349 |
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350 fn assume_entry(&self) -> DirstateEntry { |
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351 // TODO: convert through raw bits instead? |
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352 let wdir_tracked = self.flags().contains(Flags::WDIR_TRACKED); |
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353 let p1_tracked = self.flags().contains(Flags::P1_TRACKED); |
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354 let p2_info = self.flags().contains(Flags::P2_INFO); |
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355 let mode_size = if self.flags().contains(Flags::HAS_MODE_AND_SIZE) |
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356 && !self.flags().contains(Flags::EXPECTED_STATE_IS_MODIFIED) |
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357 { |
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358 Some((self.synthesize_unix_mode(), self.size.into())) |
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359 } else { |
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360 None |
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361 }; |
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362 let mtime = if self.flags().contains(Flags::HAS_FILE_MTIME) |
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363 && !self.flags().contains(Flags::EXPECTED_STATE_IS_MODIFIED) |
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364 { |
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365 Some(self.mtime.truncated_seconds.into()) |
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366 } else { |
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367 None |
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368 }; |
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369 DirstateEntry::from_v2_data( |
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370 wdir_tracked, |
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371 p1_tracked, |
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372 p2_info, |
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373 mode_size, |
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374 mtime, |
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375 ) |
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376 } |
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377 |
47334
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378 pub(super) fn entry( |
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379 &self, |
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380 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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381 if self.has_entry() { |
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382 Ok(Some(self.assume_entry())) |
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383 } else { |
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384 Ok(None) |
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385 } |
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386 } |
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387 |
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388 pub(super) fn children<'on_disk>( |
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389 &self, |
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390 on_disk: &'on_disk [u8], |
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391 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
47677
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|
392 read_nodes(on_disk, self.children) |
47283
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393 } |
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394 |
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395 pub(super) fn to_in_memory_node<'on_disk>( |
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396 &self, |
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397 on_disk: &'on_disk [u8], |
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398 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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399 Ok(dirstate_map::Node { |
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400 children: dirstate_map::ChildNodes::OnDisk( |
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401 self.children(on_disk)?, |
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402 ), |
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403 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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404 data: self.node_data()?, |
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405 descendants_with_entry_count: self |
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406 .descendants_with_entry_count |
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407 .get(), |
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408 tracked_descendants_count: self.tracked_descendants_count.get(), |
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409 }) |
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410 } |
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411 |
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412 fn from_dirstate_entry( |
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413 entry: &DirstateEntry, |
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414 ) -> (Flags, U32Be, PackedTruncatedTimestamp) { |
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415 let (wdir_tracked, p1_tracked, p2_info, mode_size_opt, mtime_opt) = |
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416 entry.v2_data(); |
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417 // TODO: convert throug raw flag bits instead? |
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418 let mut flags = Flags::empty(); |
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419 flags.set(Flags::WDIR_TRACKED, wdir_tracked); |
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420 flags.set(Flags::P1_TRACKED, p1_tracked); |
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421 flags.set(Flags::P2_INFO, p2_info); |
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422 let size = 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 flags.insert(Flags::HAS_MODE_AND_SIZE); |
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428 s.into() |
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429 } else { |
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430 0.into() |
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431 }; |
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432 let mtime = if let Some(m) = mtime_opt { |
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433 flags.insert(Flags::HAS_FILE_MTIME); |
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434 PackedTruncatedTimestamp { |
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435 truncated_seconds: m.into(), |
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436 nanoseconds: 0.into(), |
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437 } |
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438 } else { |
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439 PackedTruncatedTimestamp::null() |
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440 }; |
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441 (flags, size, mtime) |
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442 } |
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443 } |
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444 |
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445 fn read_hg_path( |
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446 on_disk: &[u8], |
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447 slice: PathSlice, |
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448 ) -> Result<&HgPath, DirstateV2ParseError> { |
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449 read_slice(on_disk, slice.start, slice.len.get()).map(HgPath::new) |
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450 } |
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451 |
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452 fn read_nodes( |
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453 on_disk: &[u8], |
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454 slice: ChildNodes, |
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455 ) -> Result<&[Node], DirstateV2ParseError> { |
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456 read_slice(on_disk, slice.start, slice.len.get()) |
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457 } |
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458 |
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459 fn read_slice<T, Len>( |
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460 on_disk: &[u8], |
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461 start: Offset, |
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462 len: Len, |
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463 ) -> Result<&[T], DirstateV2ParseError> |
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464 where |
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465 T: BytesCast, |
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466 Len: TryInto<usize>, |
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467 { |
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468 // Either `usize::MAX` would result in "out of bounds" error since a single |
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469 // `&[u8]` cannot occupy the entire addess space. |
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470 let start = start.get().try_into().unwrap_or(std::usize::MAX); |
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471 let len = len.try_into().unwrap_or(std::usize::MAX); |
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472 on_disk |
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473 .get(start..) |
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474 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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475 .map(|(slice, _rest)| slice) |
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476 .ok_or_else(|| DirstateV2ParseError) |
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477 } |
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478 |
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479 pub(crate) fn for_each_tracked_path<'on_disk>( |
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480 on_disk: &'on_disk [u8], |
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481 metadata: &[u8], |
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482 mut f: impl FnMut(&'on_disk HgPath), |
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483 ) -> Result<(), DirstateV2ParseError> { |
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484 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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485 .map_err(|_| DirstateV2ParseError)?; |
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486 fn recur<'on_disk>( |
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487 on_disk: &'on_disk [u8], |
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488 nodes: ChildNodes, |
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489 f: &mut impl FnMut(&'on_disk HgPath), |
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490 ) -> Result<(), DirstateV2ParseError> { |
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491 for node in read_nodes(on_disk, nodes)? { |
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492 if let Some(entry) = node.entry()? { |
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493 if entry.state().is_tracked() { |
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494 f(node.full_path(on_disk)?) |
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495 } |
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496 } |
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497 recur(on_disk, node.children, f)? |
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498 } |
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499 Ok(()) |
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500 } |
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501 recur(on_disk, meta.root_nodes, &mut f) |
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502 } |
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503 |
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504 /// Returns new data and metadata, together with whether that data should be |
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505 /// appended to the existing data file whose content is at |
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506 /// `dirstate_map.on_disk` (true), instead of written to a new data file |
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507 /// (false). |
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508 pub(super) fn write( |
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509 dirstate_map: &mut DirstateMap, |
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510 can_append: bool, |
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511 ) -> Result<(Vec<u8>, Vec<u8>, bool), DirstateError> { |
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512 let append = can_append && dirstate_map.write_should_append(); |
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513 |
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514 // This ignores the space for paths, and for nodes without an entry. |
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515 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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516 let size_guess = std::mem::size_of::<Node>() |
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517 * dirstate_map.nodes_with_entry_count as usize; |
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518 |
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519 let mut writer = Writer { |
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520 dirstate_map, |
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521 append, |
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522 out: Vec::with_capacity(size_guess), |
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523 }; |
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524 |
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525 let root_nodes = writer.write_nodes(dirstate_map.root.as_ref())?; |
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526 |
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527 let meta = TreeMetadata { |
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528 root_nodes, |
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529 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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530 nodes_with_copy_source_count: dirstate_map |
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531 .nodes_with_copy_source_count |
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532 .into(), |
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533 unreachable_bytes: dirstate_map.unreachable_bytes.into(), |
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534 unused: [0; 4], |
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535 ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
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536 }; |
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537 Ok((writer.out, meta.as_bytes().to_vec(), append)) |
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538 } |
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539 |
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540 struct Writer<'dmap, 'on_disk> { |
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541 dirstate_map: &'dmap DirstateMap<'on_disk>, |
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542 append: bool, |
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543 out: Vec<u8>, |
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544 } |
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545 |
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546 impl Writer<'_, '_> { |
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547 fn write_nodes( |
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548 &mut self, |
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549 nodes: dirstate_map::ChildNodesRef, |
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550 ) -> Result<ChildNodes, DirstateError> { |
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551 // Reuse already-written nodes if possible |
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552 if self.append { |
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553 if let dirstate_map::ChildNodesRef::OnDisk(nodes_slice) = nodes { |
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554 let start = self.on_disk_offset_of(nodes_slice).expect( |
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555 "dirstate-v2 OnDisk nodes not found within on_disk", |
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556 ); |
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557 let len = child_nodes_len_from_usize(nodes_slice.len()); |
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558 return Ok(ChildNodes { start, len }); |
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559 } |
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560 } |
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561 |
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562 // `dirstate_map::ChildNodes::InMemory` contains a `HashMap` which has |
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563 // undefined iteration order. Sort to enable binary search in the |
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564 // written file. |
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565 let nodes = nodes.sorted(); |
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566 let nodes_len = nodes.len(); |
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567 |
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568 // First accumulate serialized nodes in a `Vec` |
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569 let mut on_disk_nodes = Vec::with_capacity(nodes_len); |
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570 for node in nodes { |
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571 let children = |
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572 self.write_nodes(node.children(self.dirstate_map.on_disk)?)?; |
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573 let full_path = node.full_path(self.dirstate_map.on_disk)?; |
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574 let full_path = self.write_path(full_path.as_bytes()); |
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575 let copy_source = if let Some(source) = |
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576 node.copy_source(self.dirstate_map.on_disk)? |
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577 { |
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578 self.write_path(source.as_bytes()) |
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579 } else { |
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580 PathSlice { |
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581 start: 0.into(), |
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582 len: 0.into(), |
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583 } |
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584 }; |
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585 on_disk_nodes.push(match node { |
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586 NodeRef::InMemory(path, node) => { |
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587 let (flags, size, mtime) = match &node.data { |
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588 dirstate_map::NodeData::Entry(entry) => { |
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589 Node::from_dirstate_entry(entry) |
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590 } |
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591 dirstate_map::NodeData::CachedDirectory { mtime } => ( |
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592 Flags::HAS_DIRECTORY_MTIME, |
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593 0.into(), |
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594 (*mtime).into(), |
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595 ), |
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596 dirstate_map::NodeData::None => ( |
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597 Flags::empty(), |
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598 0.into(), |
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599 PackedTruncatedTimestamp::null(), |
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600 ), |
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601 }; |
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602 Node { |
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603 children, |
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604 copy_source, |
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605 full_path, |
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606 base_name_start: u16::try_from(path.base_name_start()) |
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607 // Could only panic for paths over 64 KiB |
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608 .expect("dirstate-v2 path length overflow") |
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609 .into(), |
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610 descendants_with_entry_count: node |
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611 .descendants_with_entry_count |
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612 .into(), |
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613 tracked_descendants_count: node |
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614 .tracked_descendants_count |
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615 .into(), |
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616 flags: flags.bits().into(), |
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617 size, |
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618 mtime, |
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619 } |
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620 } |
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621 NodeRef::OnDisk(node) => Node { |
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622 children, |
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623 copy_source, |
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624 full_path, |
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625 ..*node |
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626 }, |
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627 }) |
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628 } |
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629 // … so we can write them contiguously, after writing everything else |
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630 // they refer to. |
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631 let start = self.current_offset(); |
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632 let len = child_nodes_len_from_usize(nodes_len); |
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633 self.out.extend(on_disk_nodes.as_bytes()); |
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634 Ok(ChildNodes { start, len }) |
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635 } |
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636 |
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637 /// If the given slice of items is within `on_disk`, returns its offset |
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638 /// from the start of `on_disk`. |
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639 fn on_disk_offset_of<T>(&self, slice: &[T]) -> Option<Offset> |
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640 where |
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641 T: BytesCast, |
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642 { |
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643 fn address_range(slice: &[u8]) -> std::ops::RangeInclusive<usize> { |
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644 let start = slice.as_ptr() as usize; |
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645 let end = start + slice.len(); |
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646 start..=end |
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647 } |
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648 let slice_addresses = address_range(slice.as_bytes()); |
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649 let on_disk_addresses = address_range(self.dirstate_map.on_disk); |
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650 if on_disk_addresses.contains(slice_addresses.start()) |
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651 && on_disk_addresses.contains(slice_addresses.end()) |
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652 { |
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653 let offset = slice_addresses.start() - on_disk_addresses.start(); |
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654 Some(offset_from_usize(offset)) |
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655 } else { |
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656 None |
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657 } |
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658 } |
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659 |
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660 fn current_offset(&mut self) -> Offset { |
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661 let mut offset = self.out.len(); |
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662 if self.append { |
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663 offset += self.dirstate_map.on_disk.len() |
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664 } |
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665 offset_from_usize(offset) |
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666 } |
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667 |
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668 fn write_path(&mut self, slice: &[u8]) -> PathSlice { |
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669 let len = path_len_from_usize(slice.len()); |
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670 // Reuse an already-written path if possible |
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671 if self.append { |
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672 if let Some(start) = self.on_disk_offset_of(slice) { |
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673 return PathSlice { start, len }; |
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674 } |
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675 } |
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676 let start = self.current_offset(); |
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677 self.out.extend(slice.as_bytes()); |
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678 PathSlice { start, len } |
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679 } |
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680 } |
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681 |
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682 fn offset_from_usize(x: usize) -> Offset { |
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683 u32::try_from(x) |
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684 // Could only panic for a dirstate file larger than 4 GiB |
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685 .expect("dirstate-v2 offset overflow") |
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686 .into() |
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687 } |
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688 |
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689 fn child_nodes_len_from_usize(x: usize) -> Size { |
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690 u32::try_from(x) |
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691 // Could only panic with over 4 billion nodes |
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692 .expect("dirstate-v2 slice length overflow") |
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693 .into() |
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694 } |
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695 |
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696 fn path_len_from_usize(x: usize) -> PathSize { |
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697 u16::try_from(x) |
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698 // Could only panic for paths over 64 KiB |
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699 .expect("dirstate-v2 path length overflow") |
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700 .into() |
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701 } |
48219
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702 |
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703 impl From<TruncatedTimestamp> for PackedTruncatedTimestamp { |
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704 fn from(timestamp: TruncatedTimestamp) -> Self { |
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705 Self { |
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706 truncated_seconds: timestamp.truncated_seconds().into(), |
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707 nanoseconds: timestamp.nanoseconds().into(), |
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708 } |
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709 } |
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710 } |
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711 |
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712 impl TryFrom<PackedTruncatedTimestamp> for TruncatedTimestamp { |
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713 type Error = DirstateV2ParseError; |
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714 |
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715 fn try_from( |
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716 timestamp: PackedTruncatedTimestamp, |
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717 ) -> Result<Self, Self::Error> { |
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718 Self::from_already_truncated( |
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719 timestamp.truncated_seconds.get(), |
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720 timestamp.nanoseconds.get(), |
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721 ) |
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722 } |
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723 } |
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724 impl PackedTruncatedTimestamp { |
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725 fn null() -> Self { |
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726 Self { |
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727 truncated_seconds: 0.into(), |
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728 nanoseconds: 0.into(), |
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729 } |
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730 } |
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731 } |