Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 48022:f2a9db29cb2d
rust: Make the fields of DirstateEntry private
This is a first step toward making its internal structure equivalent to
Python’s DirstateItem.
Differential Revision: https://phab.mercurial-scm.org/D11461
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 17 Sep 2021 13:33:45 +0200 |
parents | 681851d6409b |
children | ab5a7fdbf75c |
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1 //! The "version 2" disk representation of the dirstate |
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2 //! |
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3 //! # File format |
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4 //! |
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5 //! In dirstate-v2 format, the `.hg/dirstate` file is a "docket that starts |
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6 //! with a fixed-sized header whose layout is defined by the `DocketHeader` |
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7 //! struct, followed by the data file identifier. |
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8 //! |
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9 //! A separate `.hg/dirstate.{uuid}.d` file contains most of the data. That |
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10 //! file may be longer than the size given in the docket, but not shorter. Only |
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11 //! the start of the data file up to the given size is considered. The |
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12 //! fixed-size "root" of the dirstate tree whose layout is defined by the |
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13 //! `Root` struct is found at the end of that slice of data. |
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14 //! |
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15 //! Its `root_nodes` field contains the slice (offset and length) to |
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16 //! the nodes representing the files and directories at the root of the |
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17 //! repository. Each node is also fixed-size, defined by the `Node` struct. |
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18 //! Nodes in turn contain slices to variable-size paths, and to their own child |
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19 //! nodes (if any) for nested files and directories. |
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20 |
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21 use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef}; |
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22 use crate::dirstate_tree::path_with_basename::WithBasename; |
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23 use crate::errors::HgError; |
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24 use crate::utils::hg_path::HgPath; |
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25 use crate::DirstateEntry; |
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26 use crate::DirstateError; |
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27 use crate::DirstateParents; |
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28 use crate::EntryState; |
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29 use bytes_cast::unaligned::{I32Be, I64Be, U16Be, U32Be}; |
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30 use bytes_cast::BytesCast; |
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31 use format_bytes::format_bytes; |
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32 use std::borrow::Cow; |
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33 use std::convert::{TryFrom, TryInto}; |
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34 use std::time::{Duration, SystemTime, UNIX_EPOCH}; |
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35 |
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36 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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37 /// This a redundant sanity check more than an actual "magic number" since |
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38 /// `.hg/requires` already governs which format should be used. |
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39 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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40 |
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41 /// Keep space for 256-bit hashes |
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42 const STORED_NODE_ID_BYTES: usize = 32; |
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43 |
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44 /// … even though only 160 bits are used for now, with SHA-1 |
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45 const USED_NODE_ID_BYTES: usize = 20; |
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46 |
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47 pub(super) const IGNORE_PATTERNS_HASH_LEN: usize = 20; |
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48 pub(super) type IgnorePatternsHash = [u8; IGNORE_PATTERNS_HASH_LEN]; |
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49 |
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50 /// Must match the constant of the same name in |
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51 /// `mercurial/dirstateutils/docket.py` |
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52 const TREE_METADATA_SIZE: usize = 44; |
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53 |
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54 /// Make sure that size-affecting changes are made knowingly |
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55 #[allow(unused)] |
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56 fn static_assert_size_of() { |
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57 let _ = std::mem::transmute::<TreeMetadata, [u8; TREE_METADATA_SIZE]>; |
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58 let _ = std::mem::transmute::<DocketHeader, [u8; TREE_METADATA_SIZE + 81]>; |
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59 let _ = std::mem::transmute::<Node, [u8; 43]>; |
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60 } |
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61 |
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62 // Must match `HEADER` in `mercurial/dirstateutils/docket.py` |
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63 #[derive(BytesCast)] |
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64 #[repr(C)] |
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65 struct DocketHeader { |
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66 marker: [u8; V2_FORMAT_MARKER.len()], |
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67 parent_1: [u8; STORED_NODE_ID_BYTES], |
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68 parent_2: [u8; STORED_NODE_ID_BYTES], |
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69 |
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70 /// Counted in bytes |
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71 data_size: Size, |
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72 |
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73 metadata: TreeMetadata, |
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74 |
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75 uuid_size: u8, |
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76 } |
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77 |
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78 pub struct Docket<'on_disk> { |
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79 header: &'on_disk DocketHeader, |
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80 uuid: &'on_disk [u8], |
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81 } |
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82 |
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83 #[derive(BytesCast)] |
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84 #[repr(C)] |
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85 struct TreeMetadata { |
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86 root_nodes: ChildNodes, |
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87 nodes_with_entry_count: Size, |
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88 nodes_with_copy_source_count: Size, |
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89 |
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90 /// How many bytes of this data file are not used anymore |
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91 unreachable_bytes: Size, |
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92 |
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93 /// Current version always sets these bytes to zero when creating or |
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94 /// updating a dirstate. Future versions could assign some bits to signal |
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95 /// for example "the version that last wrote/updated this dirstate did so |
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96 /// in such and such way that can be relied on by versions that know to." |
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97 unused: [u8; 4], |
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98 |
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99 /// If non-zero, a hash of ignore files that were used for some previous |
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100 /// run of the `status` algorithm. |
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101 /// |
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102 /// We define: |
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103 /// |
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104 /// * "Root" ignore files are `.hgignore` at the root of the repository if |
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105 /// it exists, and files from `ui.ignore.*` config. This set of files is |
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106 /// then sorted by the string representation of their path. |
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107 /// * The "expanded contents" of an ignore files is the byte string made |
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108 /// by concatenating its contents with the "expanded contents" of other |
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109 /// files included with `include:` or `subinclude:` files, in inclusion |
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110 /// order. This definition is recursive, as included files can |
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111 /// themselves include more files. |
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112 /// |
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113 /// This hash is defined as the SHA-1 of the concatenation (in sorted |
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114 /// order) of the "expanded contents" of each "root" ignore file. |
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115 /// (Note that computing this does not require actually concatenating byte |
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116 /// strings into contiguous memory, instead SHA-1 hashing can be done |
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117 /// incrementally.) |
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118 ignore_patterns_hash: IgnorePatternsHash, |
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119 } |
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120 |
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121 #[derive(BytesCast)] |
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122 #[repr(C)] |
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123 pub(super) struct Node { |
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124 full_path: PathSlice, |
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125 |
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126 /// In bytes from `self.full_path.start` |
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127 base_name_start: PathSize, |
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128 |
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129 copy_source: OptPathSlice, |
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130 children: ChildNodes, |
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131 pub(super) descendants_with_entry_count: Size, |
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132 pub(super) tracked_descendants_count: Size, |
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133 |
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134 /// Depending on the value of `state`: |
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135 /// |
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136 /// * A null byte: `data` is not used. |
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137 /// |
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138 /// * A `n`, `a`, `r`, or `m` ASCII byte: `state` and `data` together |
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139 /// represent a dirstate entry like in the v1 format. |
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140 /// |
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141 /// * A `d` ASCII byte: the bytes of `data` should instead be interpreted |
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142 /// as the `Timestamp` for the mtime of a cached directory. |
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143 /// |
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144 /// The presence of this state means that at some point, this path in |
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145 /// the working directory was observed: |
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146 /// |
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147 /// - To be a directory |
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148 /// - With the modification time as given by `Timestamp` |
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149 /// - That timestamp was already strictly in the past when observed, |
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150 /// meaning that later changes cannot happen in the same clock tick |
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151 /// and must cause a different modification time (unless the system |
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152 /// clock jumps back and we get unlucky, which is not impossible but |
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153 /// but deemed unlikely enough). |
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154 /// - All direct children of this directory (as returned by |
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155 /// `std::fs::read_dir`) either have a corresponding dirstate node, or |
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156 /// are ignored by ignore patterns whose hash is in |
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157 /// `TreeMetadata::ignore_patterns_hash`. |
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158 /// |
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159 /// This means that if `std::fs::symlink_metadata` later reports the |
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160 /// same modification time and ignored patterns haven’t changed, a run |
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161 /// of status that is not listing ignored files can skip calling |
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162 /// `std::fs::read_dir` again for this directory, iterate child |
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163 /// dirstate nodes instead. |
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164 state: u8, |
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165 data: Entry, |
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166 } |
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167 |
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168 #[derive(BytesCast, Copy, Clone)] |
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169 #[repr(C)] |
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170 struct Entry { |
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171 mode: I32Be, |
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172 mtime: I32Be, |
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173 size: I32Be, |
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174 } |
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175 |
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176 /// Duration since the Unix epoch |
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177 #[derive(BytesCast, Copy, Clone, PartialEq)] |
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178 #[repr(C)] |
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179 pub(super) struct Timestamp { |
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180 seconds: I64Be, |
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181 |
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182 /// In `0 .. 1_000_000_000`. |
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183 /// |
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184 /// This timestamp is later or earlier than `(seconds, 0)` by this many |
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185 /// nanoseconds, if `seconds` is non-negative or negative, respectively. |
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186 nanoseconds: U32Be, |
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187 } |
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188 |
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189 /// Counted in bytes from the start of the file |
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190 /// |
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191 /// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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192 type Offset = U32Be; |
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193 |
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194 /// Counted in number of items |
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195 /// |
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196 /// NOTE: we choose not to support counting more than 4 billion nodes anywhere. |
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197 type Size = U32Be; |
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198 |
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199 /// Counted in bytes |
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200 /// |
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201 /// NOTE: we choose not to support file names/paths longer than 64 KiB. |
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202 type PathSize = U16Be; |
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203 |
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204 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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205 /// of either some other node or of the repository root. |
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206 /// |
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207 /// Always sorted by ascending `full_path`, to allow binary search. |
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208 /// Since nodes with the same parent nodes also have the same parent path, |
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209 /// only the `base_name`s need to be compared during binary search. |
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210 #[derive(BytesCast, Copy, Clone)] |
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211 #[repr(C)] |
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212 struct ChildNodes { |
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213 start: Offset, |
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214 len: Size, |
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215 } |
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216 |
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217 /// A `HgPath` of `len` bytes |
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218 #[derive(BytesCast, Copy, Clone)] |
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219 #[repr(C)] |
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220 struct PathSlice { |
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221 start: Offset, |
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222 len: PathSize, |
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223 } |
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224 |
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225 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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226 type OptPathSlice = PathSlice; |
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227 |
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228 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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229 /// |
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230 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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231 #[derive(Debug)] |
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232 pub struct DirstateV2ParseError; |
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233 |
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234 impl From<DirstateV2ParseError> for HgError { |
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235 fn from(_: DirstateV2ParseError) -> Self { |
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236 HgError::corrupted("dirstate-v2 parse error") |
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237 } |
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238 } |
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239 |
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240 impl From<DirstateV2ParseError> for crate::DirstateError { |
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241 fn from(error: DirstateV2ParseError) -> Self { |
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242 HgError::from(error).into() |
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243 } |
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244 } |
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245 |
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246 impl<'on_disk> Docket<'on_disk> { |
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247 pub fn parents(&self) -> DirstateParents { |
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248 use crate::Node; |
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249 let p1 = Node::try_from(&self.header.parent_1[..USED_NODE_ID_BYTES]) |
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250 .unwrap() |
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251 .clone(); |
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252 let p2 = Node::try_from(&self.header.parent_2[..USED_NODE_ID_BYTES]) |
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253 .unwrap() |
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254 .clone(); |
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255 DirstateParents { p1, p2 } |
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256 } |
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257 |
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258 pub fn tree_metadata(&self) -> &[u8] { |
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259 self.header.metadata.as_bytes() |
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260 } |
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261 |
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262 pub fn data_size(&self) -> usize { |
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263 // This `unwrap` could only panic on a 16-bit CPU |
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264 self.header.data_size.get().try_into().unwrap() |
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265 } |
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266 |
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267 pub fn data_filename(&self) -> String { |
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268 String::from_utf8(format_bytes!(b"dirstate.{}", self.uuid)).unwrap() |
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269 } |
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270 } |
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271 |
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272 pub fn read_docket( |
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273 on_disk: &[u8], |
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274 ) -> Result<Docket<'_>, DirstateV2ParseError> { |
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275 let (header, uuid) = |
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276 DocketHeader::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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277 let uuid_size = header.uuid_size as usize; |
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278 if header.marker == *V2_FORMAT_MARKER && uuid.len() == uuid_size { |
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279 Ok(Docket { header, uuid }) |
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280 } else { |
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281 Err(DirstateV2ParseError) |
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282 } |
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283 } |
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284 |
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285 pub(super) fn read<'on_disk>( |
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286 on_disk: &'on_disk [u8], |
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287 metadata: &[u8], |
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288 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> { |
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289 if on_disk.is_empty() { |
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290 return Ok(DirstateMap::empty(on_disk)); |
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291 } |
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292 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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293 .map_err(|_| DirstateV2ParseError)?; |
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294 let dirstate_map = DirstateMap { |
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295 on_disk, |
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296 root: dirstate_map::ChildNodes::OnDisk(read_nodes( |
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297 on_disk, |
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298 meta.root_nodes, |
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299 )?), |
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300 nodes_with_entry_count: meta.nodes_with_entry_count.get(), |
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301 nodes_with_copy_source_count: meta.nodes_with_copy_source_count.get(), |
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302 ignore_patterns_hash: meta.ignore_patterns_hash, |
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303 unreachable_bytes: meta.unreachable_bytes.get(), |
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304 }; |
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305 Ok(dirstate_map) |
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306 } |
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307 |
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308 impl Node { |
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309 pub(super) fn full_path<'on_disk>( |
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310 &self, |
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311 on_disk: &'on_disk [u8], |
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312 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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313 read_hg_path(on_disk, self.full_path) |
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314 } |
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315 |
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316 pub(super) fn base_name_start<'on_disk>( |
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317 &self, |
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318 ) -> Result<usize, DirstateV2ParseError> { |
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319 let start = self.base_name_start.get(); |
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320 if start < self.full_path.len.get() { |
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321 let start = usize::try_from(start) |
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322 // u32 -> usize, could only panic on a 16-bit CPU |
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323 .expect("dirstate-v2 base_name_start out of bounds"); |
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324 Ok(start) |
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325 } else { |
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326 Err(DirstateV2ParseError) |
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327 } |
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328 } |
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329 |
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330 pub(super) fn base_name<'on_disk>( |
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331 &self, |
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332 on_disk: &'on_disk [u8], |
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333 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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334 let full_path = self.full_path(on_disk)?; |
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335 let base_name_start = self.base_name_start()?; |
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336 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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337 } |
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338 |
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339 pub(super) fn path<'on_disk>( |
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340 &self, |
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341 on_disk: &'on_disk [u8], |
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342 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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343 Ok(WithBasename::from_raw_parts( |
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344 Cow::Borrowed(self.full_path(on_disk)?), |
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345 self.base_name_start()?, |
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346 )) |
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347 } |
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348 |
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349 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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350 self.copy_source.start.get() != 0 |
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351 } |
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352 |
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353 pub(super) fn copy_source<'on_disk>( |
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354 &self, |
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355 on_disk: &'on_disk [u8], |
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356 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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357 Ok(if self.has_copy_source() { |
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358 Some(read_hg_path(on_disk, self.copy_source)?) |
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359 } else { |
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360 None |
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361 }) |
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362 } |
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363 |
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364 pub(super) fn node_data( |
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365 &self, |
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366 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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367 let entry = |state| { |
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368 dirstate_map::NodeData::Entry(self.entry_with_given_state(state)) |
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369 }; |
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370 |
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371 match self.state { |
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372 b'\0' => Ok(dirstate_map::NodeData::None), |
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373 b'd' => Ok(dirstate_map::NodeData::CachedDirectory { |
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374 mtime: *self.data.as_timestamp(), |
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375 }), |
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376 b'n' => Ok(entry(EntryState::Normal)), |
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377 b'a' => Ok(entry(EntryState::Added)), |
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378 b'r' => Ok(entry(EntryState::Removed)), |
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379 b'm' => Ok(entry(EntryState::Merged)), |
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380 _ => Err(DirstateV2ParseError), |
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381 } |
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382 } |
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383 |
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384 pub(super) fn cached_directory_mtime(&self) -> Option<&Timestamp> { |
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385 if self.state == b'd' { |
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386 Some(self.data.as_timestamp()) |
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387 } else { |
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388 None |
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389 } |
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390 } |
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391 |
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392 pub(super) fn state( |
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393 &self, |
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394 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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395 match self.state { |
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396 b'\0' | b'd' => Ok(None), |
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397 b'n' => Ok(Some(EntryState::Normal)), |
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398 b'a' => Ok(Some(EntryState::Added)), |
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399 b'r' => Ok(Some(EntryState::Removed)), |
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400 b'm' => Ok(Some(EntryState::Merged)), |
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401 _ => Err(DirstateV2ParseError), |
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402 } |
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403 } |
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404 |
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405 fn entry_with_given_state(&self, state: EntryState) -> DirstateEntry { |
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406 // For now, the on-disk representation of DirstateEntry in dirstate-v2 |
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407 // format is equivalent to that of dirstate-v1. When that changes, add |
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408 // a new constructor. |
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409 DirstateEntry::from_v1_data( |
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410 state, |
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411 self.data.mode.get(), |
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412 self.data.size.get(), |
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413 self.data.mtime.get(), |
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414 ) |
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415 } |
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416 |
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417 pub(super) fn entry( |
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418 &self, |
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419 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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420 Ok(self |
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421 .state()? |
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422 .map(|state| self.entry_with_given_state(state))) |
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423 } |
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424 |
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425 pub(super) fn children<'on_disk>( |
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426 &self, |
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427 on_disk: &'on_disk [u8], |
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428 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
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429 read_nodes(on_disk, self.children) |
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430 } |
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431 |
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432 pub(super) fn to_in_memory_node<'on_disk>( |
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433 &self, |
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434 on_disk: &'on_disk [u8], |
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435 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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436 Ok(dirstate_map::Node { |
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437 children: dirstate_map::ChildNodes::OnDisk( |
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438 self.children(on_disk)?, |
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439 ), |
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440 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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441 data: self.node_data()?, |
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442 descendants_with_entry_count: self |
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443 .descendants_with_entry_count |
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444 .get(), |
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445 tracked_descendants_count: self.tracked_descendants_count.get(), |
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446 }) |
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447 } |
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448 } |
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449 |
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450 impl Entry { |
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451 fn from_timestamp(timestamp: Timestamp) -> Self { |
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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::<Timestamp, Entry>(timestamp) } |
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458 } |
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459 |
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460 fn as_timestamp(&self) -> &Timestamp { |
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461 // Safety: same as above in `from_timestamp` |
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462 unsafe { &*(self as *const Entry as *const Timestamp) } |
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463 } |
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464 } |
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465 |
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466 impl Timestamp { |
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467 pub fn seconds(&self) -> i64 { |
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468 self.seconds.get() |
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469 } |
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470 } |
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471 |
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472 impl From<SystemTime> for Timestamp { |
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473 fn from(system_time: SystemTime) -> Self { |
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474 let (secs, nanos) = match system_time.duration_since(UNIX_EPOCH) { |
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475 Ok(duration) => { |
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476 (duration.as_secs() as i64, duration.subsec_nanos()) |
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477 } |
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478 Err(error) => { |
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479 let negative = error.duration(); |
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480 (-(negative.as_secs() as i64), negative.subsec_nanos()) |
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481 } |
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482 }; |
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483 Timestamp { |
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484 seconds: secs.into(), |
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485 nanoseconds: nanos.into(), |
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486 } |
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487 } |
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488 } |
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489 |
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490 impl From<&'_ Timestamp> for SystemTime { |
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491 fn from(timestamp: &'_ Timestamp) -> Self { |
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492 let secs = timestamp.seconds.get(); |
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493 let nanos = timestamp.nanoseconds.get(); |
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494 if secs >= 0 { |
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495 UNIX_EPOCH + Duration::new(secs as u64, nanos) |
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496 } else { |
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497 UNIX_EPOCH - Duration::new((-secs) as u64, nanos) |
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498 } |
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499 } |
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500 } |
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501 |
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502 fn read_hg_path( |
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503 on_disk: &[u8], |
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504 slice: PathSlice, |
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505 ) -> Result<&HgPath, DirstateV2ParseError> { |
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506 read_slice(on_disk, slice.start, slice.len.get()).map(HgPath::new) |
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507 } |
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508 |
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509 fn read_nodes( |
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510 on_disk: &[u8], |
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511 slice: ChildNodes, |
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512 ) -> Result<&[Node], DirstateV2ParseError> { |
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513 read_slice(on_disk, slice.start, slice.len.get()) |
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514 } |
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515 |
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516 fn read_slice<T, Len>( |
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517 on_disk: &[u8], |
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518 start: Offset, |
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519 len: Len, |
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520 ) -> Result<&[T], DirstateV2ParseError> |
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521 where |
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522 T: BytesCast, |
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523 Len: TryInto<usize>, |
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524 { |
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525 // Either `usize::MAX` would result in "out of bounds" error since a single |
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526 // `&[u8]` cannot occupy the entire addess space. |
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527 let start = start.get().try_into().unwrap_or(std::usize::MAX); |
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528 let len = len.try_into().unwrap_or(std::usize::MAX); |
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529 on_disk |
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530 .get(start..) |
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531 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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532 .map(|(slice, _rest)| slice) |
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533 .ok_or_else(|| DirstateV2ParseError) |
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534 } |
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535 |
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536 pub(crate) fn for_each_tracked_path<'on_disk>( |
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537 on_disk: &'on_disk [u8], |
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538 metadata: &[u8], |
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539 mut f: impl FnMut(&'on_disk HgPath), |
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540 ) -> Result<(), DirstateV2ParseError> { |
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541 let (meta, _) = TreeMetadata::from_bytes(metadata) |
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542 .map_err(|_| DirstateV2ParseError)?; |
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543 fn recur<'on_disk>( |
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544 on_disk: &'on_disk [u8], |
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545 nodes: ChildNodes, |
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546 f: &mut impl FnMut(&'on_disk HgPath), |
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547 ) -> Result<(), DirstateV2ParseError> { |
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548 for node in read_nodes(on_disk, nodes)? { |
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549 if let Some(state) = node.state()? { |
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550 if state.is_tracked() { |
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551 f(node.full_path(on_disk)?) |
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552 } |
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553 } |
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554 recur(on_disk, node.children, f)? |
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555 } |
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556 Ok(()) |
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557 } |
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558 recur(on_disk, meta.root_nodes, &mut f) |
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559 } |
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560 |
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561 /// Returns new data and metadata, together with whether that data should be |
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562 /// appended to the existing data file whose content is at |
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563 /// `dirstate_map.on_disk` (true), instead of written to a new data file |
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564 /// (false). |
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565 pub(super) fn write( |
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566 dirstate_map: &mut DirstateMap, |
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567 can_append: bool, |
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568 ) -> Result<(Vec<u8>, Vec<u8>, bool), DirstateError> { |
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569 let append = can_append && dirstate_map.write_should_append(); |
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570 |
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571 // This ignores the space for paths, and for nodes without an entry. |
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572 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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573 let size_guess = std::mem::size_of::<Node>() |
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574 * dirstate_map.nodes_with_entry_count as usize; |
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575 |
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576 let mut writer = Writer { |
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577 dirstate_map, |
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578 append, |
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579 out: Vec::with_capacity(size_guess), |
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580 }; |
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581 |
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582 let root_nodes = writer.write_nodes(dirstate_map.root.as_ref())?; |
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583 |
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584 let meta = TreeMetadata { |
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585 root_nodes, |
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586 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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587 nodes_with_copy_source_count: dirstate_map |
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588 .nodes_with_copy_source_count |
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589 .into(), |
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590 unreachable_bytes: dirstate_map.unreachable_bytes.into(), |
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591 unused: [0; 4], |
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592 ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
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593 }; |
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594 Ok((writer.out, meta.as_bytes().to_vec(), append)) |
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595 } |
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596 |
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597 struct Writer<'dmap, 'on_disk> { |
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598 dirstate_map: &'dmap DirstateMap<'on_disk>, |
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599 append: bool, |
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600 out: Vec<u8>, |
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601 } |
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602 |
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603 impl Writer<'_, '_> { |
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604 fn write_nodes( |
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605 &mut self, |
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606 nodes: dirstate_map::ChildNodesRef, |
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607 ) -> Result<ChildNodes, DirstateError> { |
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608 // Reuse already-written nodes if possible |
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609 if self.append { |
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610 if let dirstate_map::ChildNodesRef::OnDisk(nodes_slice) = nodes { |
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611 let start = self.on_disk_offset_of(nodes_slice).expect( |
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612 "dirstate-v2 OnDisk nodes not found within on_disk", |
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613 ); |
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614 let len = child_nodes_len_from_usize(nodes_slice.len()); |
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615 return Ok(ChildNodes { start, len }); |
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616 } |
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617 } |
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618 |
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619 // `dirstate_map::ChildNodes::InMemory` contains a `HashMap` which has |
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620 // undefined iteration order. Sort to enable binary search in the |
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621 // written file. |
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622 let nodes = nodes.sorted(); |
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623 let nodes_len = nodes.len(); |
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624 |
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625 // First accumulate serialized nodes in a `Vec` |
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626 let mut on_disk_nodes = Vec::with_capacity(nodes_len); |
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627 for node in nodes { |
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628 let children = |
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629 self.write_nodes(node.children(self.dirstate_map.on_disk)?)?; |
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630 let full_path = node.full_path(self.dirstate_map.on_disk)?; |
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631 let full_path = self.write_path(full_path.as_bytes()); |
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632 let copy_source = if let Some(source) = |
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633 node.copy_source(self.dirstate_map.on_disk)? |
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634 { |
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635 self.write_path(source.as_bytes()) |
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636 } else { |
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637 PathSlice { |
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638 start: 0.into(), |
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639 len: 0.into(), |
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640 } |
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641 }; |
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642 on_disk_nodes.push(match node { |
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643 NodeRef::InMemory(path, node) => { |
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644 let (state, data) = match &node.data { |
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645 dirstate_map::NodeData::Entry(entry) => ( |
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646 entry.state().into(), |
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647 Entry { |
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648 mode: entry.mode().into(), |
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649 mtime: entry.mtime().into(), |
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650 size: entry.size().into(), |
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651 }, |
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652 ), |
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653 dirstate_map::NodeData::CachedDirectory { mtime } => { |
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654 (b'd', Entry::from_timestamp(*mtime)) |
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655 } |
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656 dirstate_map::NodeData::None => ( |
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657 b'\0', |
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658 Entry { |
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659 mode: 0.into(), |
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660 mtime: 0.into(), |
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661 size: 0.into(), |
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662 }, |
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663 ), |
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664 }; |
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665 Node { |
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666 children, |
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667 copy_source, |
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668 full_path, |
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669 base_name_start: u16::try_from(path.base_name_start()) |
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670 // Could only panic for paths over 64 KiB |
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671 .expect("dirstate-v2 path length overflow") |
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672 .into(), |
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673 descendants_with_entry_count: node |
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674 .descendants_with_entry_count |
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675 .into(), |
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676 tracked_descendants_count: node |
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677 .tracked_descendants_count |
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678 .into(), |
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679 state, |
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680 data, |
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681 } |
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682 } |
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683 NodeRef::OnDisk(node) => Node { |
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684 children, |
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685 copy_source, |
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686 full_path, |
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687 ..*node |
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688 }, |
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689 }) |
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690 } |
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691 // … so we can write them contiguously, after writing everything else |
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692 // they refer to. |
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693 let start = self.current_offset(); |
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694 let len = child_nodes_len_from_usize(nodes_len); |
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695 self.out.extend(on_disk_nodes.as_bytes()); |
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696 Ok(ChildNodes { start, len }) |
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697 } |
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698 |
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699 /// If the given slice of items is within `on_disk`, returns its offset |
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700 /// from the start of `on_disk`. |
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701 fn on_disk_offset_of<T>(&self, slice: &[T]) -> Option<Offset> |
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702 where |
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703 T: BytesCast, |
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704 { |
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705 fn address_range(slice: &[u8]) -> std::ops::RangeInclusive<usize> { |
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706 let start = slice.as_ptr() as usize; |
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707 let end = start + slice.len(); |
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708 start..=end |
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709 } |
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710 let slice_addresses = address_range(slice.as_bytes()); |
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711 let on_disk_addresses = address_range(self.dirstate_map.on_disk); |
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712 if on_disk_addresses.contains(slice_addresses.start()) |
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713 && on_disk_addresses.contains(slice_addresses.end()) |
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714 { |
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715 let offset = slice_addresses.start() - on_disk_addresses.start(); |
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716 Some(offset_from_usize(offset)) |
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717 } else { |
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718 None |
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719 } |
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720 } |
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721 |
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722 fn current_offset(&mut self) -> Offset { |
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723 let mut offset = self.out.len(); |
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724 if self.append { |
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725 offset += self.dirstate_map.on_disk.len() |
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726 } |
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727 offset_from_usize(offset) |
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728 } |
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729 |
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730 fn write_path(&mut self, slice: &[u8]) -> PathSlice { |
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731 let len = path_len_from_usize(slice.len()); |
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732 // Reuse an already-written path if possible |
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733 if self.append { |
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734 if let Some(start) = self.on_disk_offset_of(slice) { |
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735 return PathSlice { start, len }; |
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736 } |
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737 } |
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738 let start = self.current_offset(); |
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739 self.out.extend(slice.as_bytes()); |
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740 PathSlice { start, len } |
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741 } |
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742 } |
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743 |
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744 fn offset_from_usize(x: usize) -> Offset { |
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745 u32::try_from(x) |
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746 // Could only panic for a dirstate file larger than 4 GiB |
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747 .expect("dirstate-v2 offset overflow") |
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748 .into() |
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749 } |
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750 |
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751 fn child_nodes_len_from_usize(x: usize) -> Size { |
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752 u32::try_from(x) |
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753 // Could only panic with over 4 billion nodes |
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754 .expect("dirstate-v2 slice length overflow") |
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755 .into() |
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756 } |
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757 |
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758 fn path_len_from_usize(x: usize) -> PathSize { |
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759 u16::try_from(x) |
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760 // Could only panic for paths over 64 KiB |
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761 .expect("dirstate-v2 path length overflow") |
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762 .into() |
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763 } |