Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 47679:731286dc5321
dirstate-v2: Reuse existing nodes when appending to a data file
When writing a dirstate in v2 format by appending to an existing data file,
nodes that are still "unparsed" from the previous on-disk representation
have been unchanged and can therefore be reused.
This makes the new data point to previously-existing data for tree nodes.
Differential Revision: https://phab.mercurial-scm.org/D11095
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Thu, 15 Jul 2021 08:53:03 +0200 |
parents | 065e61628980 |
children | a8b0f29dc0d7 |
rev | line source |
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1 //! The "version 2" disk representation of the dirstate |
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2 //! |
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3 //! # File format |
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4 //! |
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5 //! 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 `HEADER` in `mercurial/dirstateutils/docket.py` |
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51 #[derive(BytesCast)] |
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52 #[repr(C)] |
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53 struct DocketHeader { |
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54 marker: [u8; V2_FORMAT_MARKER.len()], |
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55 parent_1: [u8; STORED_NODE_ID_BYTES], |
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56 parent_2: [u8; STORED_NODE_ID_BYTES], |
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57 |
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58 /// Counted in bytes |
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59 data_size: Size, |
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60 |
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61 uuid_size: u8, |
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62 } |
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63 |
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64 pub struct Docket<'on_disk> { |
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65 header: &'on_disk DocketHeader, |
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66 uuid: &'on_disk [u8], |
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67 } |
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68 |
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69 #[derive(BytesCast)] |
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70 #[repr(C)] |
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71 struct Root { |
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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 |
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76 /// If non-zero, a hash of ignore files that were used for some previous |
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77 /// run of the `status` algorithm. |
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78 /// |
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79 /// We define: |
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80 /// |
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81 /// * "Root" ignore files are `.hgignore` at the root of the repository if |
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82 /// it exists, and files from `ui.ignore.*` config. This set of files is |
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83 /// then sorted by the string representation of their path. |
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84 /// * The "expanded contents" of an ignore files is the byte string made |
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85 /// by concatenating its contents with the "expanded contents" of other |
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86 /// files included with `include:` or `subinclude:` files, in inclusion |
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87 /// order. This definition is recursive, as included files can |
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88 /// themselves include more files. |
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89 /// |
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90 /// This hash is defined as the SHA-1 of the concatenation (in sorted |
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91 /// order) of the "expanded contents" of each "root" ignore file. |
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92 /// (Note that computing this does not require actually concatenating byte |
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93 /// strings into contiguous memory, instead SHA-1 hashing can be done |
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94 /// incrementally.) |
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95 ignore_patterns_hash: IgnorePatternsHash, |
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96 } |
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97 |
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98 #[derive(BytesCast)] |
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99 #[repr(C)] |
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100 pub(super) struct Node { |
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101 full_path: PathSlice, |
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102 |
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103 /// In bytes from `self.full_path.start` |
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104 base_name_start: PathSize, |
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105 |
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106 copy_source: OptPathSlice, |
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107 children: ChildNodes, |
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108 pub(super) descendants_with_entry_count: Size, |
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109 pub(super) tracked_descendants_count: Size, |
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110 |
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111 /// Depending on the value of `state`: |
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112 /// |
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113 /// * A null byte: `data` is not used. |
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114 /// |
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115 /// * A `n`, `a`, `r`, or `m` ASCII byte: `state` and `data` together |
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116 /// represent a dirstate entry like in the v1 format. |
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117 /// |
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118 /// * A `d` ASCII byte: the bytes of `data` should instead be interpreted |
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119 /// as the `Timestamp` for the mtime of a cached directory. |
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120 /// |
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121 /// The presence of this state means that at some point, this path in |
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122 /// the working directory was observed: |
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123 /// |
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124 /// - To be a directory |
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125 /// - With the modification time as given by `Timestamp` |
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126 /// - That timestamp was already strictly in the past when observed, |
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127 /// meaning that later changes cannot happen in the same clock tick |
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128 /// and must cause a different modification time (unless the system |
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129 /// clock jumps back and we get unlucky, which is not impossible but |
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130 /// but deemed unlikely enough). |
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131 /// - All direct children of this directory (as returned by |
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132 /// `std::fs::read_dir`) either have a corresponding dirstate node, or |
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133 /// are ignored by ignore patterns whose hash is in |
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134 /// `Root::ignore_patterns_hash`. |
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135 /// |
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136 /// This means that if `std::fs::symlink_metadata` later reports the |
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137 /// same modification time and ignored patterns haven’t changed, a run |
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138 /// of status that is not listing ignored files can skip calling |
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139 /// `std::fs::read_dir` again for this directory, iterate child |
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140 /// dirstate nodes instead. |
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141 state: u8, |
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142 data: Entry, |
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143 } |
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144 |
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145 #[derive(BytesCast, Copy, Clone)] |
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146 #[repr(C)] |
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147 struct Entry { |
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148 mode: I32Be, |
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149 mtime: I32Be, |
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150 size: I32Be, |
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151 } |
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152 |
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153 /// Duration since the Unix epoch |
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154 #[derive(BytesCast, Copy, Clone, PartialEq)] |
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155 #[repr(C)] |
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156 pub(super) struct Timestamp { |
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157 seconds: I64Be, |
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158 |
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159 /// In `0 .. 1_000_000_000`. |
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160 /// |
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161 /// This timestamp is later or earlier than `(seconds, 0)` by this many |
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162 /// nanoseconds, if `seconds` is non-negative or negative, respectively. |
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163 nanoseconds: U32Be, |
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164 } |
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165 |
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166 /// Counted in bytes from the start of the file |
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167 /// |
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168 /// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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169 type Offset = U32Be; |
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170 |
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171 /// Counted in number of items |
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172 /// |
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173 /// NOTE: we choose not to support counting more than 4 billion nodes anywhere. |
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174 type Size = U32Be; |
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175 |
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176 /// Counted in bytes |
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177 /// |
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178 /// NOTE: we choose not to support file names/paths longer than 64 KiB. |
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179 type PathSize = U16Be; |
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180 |
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181 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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182 /// of either some other node or of the repository root. |
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183 /// |
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184 /// Always sorted by ascending `full_path`, to allow binary search. |
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185 /// Since nodes with the same parent nodes also have the same parent path, |
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186 /// only the `base_name`s need to be compared during binary search. |
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187 #[derive(BytesCast, Copy, Clone)] |
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188 #[repr(C)] |
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189 struct ChildNodes { |
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190 start: Offset, |
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191 len: Size, |
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192 } |
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193 |
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194 /// A `HgPath` of `len` bytes |
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195 #[derive(BytesCast, Copy, Clone)] |
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196 #[repr(C)] |
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197 struct PathSlice { |
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198 start: Offset, |
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199 len: PathSize, |
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200 } |
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201 |
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202 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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203 type OptPathSlice = PathSlice; |
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204 |
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205 /// Make sure that size-affecting changes are made knowingly |
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206 fn _static_assert_size_of() { |
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207 let _ = std::mem::transmute::<DocketHeader, [u8; 81]>; |
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208 let _ = std::mem::transmute::<Root, [u8; 36]>; |
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209 let _ = std::mem::transmute::<Node, [u8; 43]>; |
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210 } |
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211 |
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212 /// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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213 /// |
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214 /// This should only happen if Mercurial is buggy or a repository is corrupted. |
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215 #[derive(Debug)] |
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216 pub struct DirstateV2ParseError; |
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217 |
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218 impl From<DirstateV2ParseError> for HgError { |
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219 fn from(_: DirstateV2ParseError) -> Self { |
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220 HgError::corrupted("dirstate-v2 parse error") |
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221 } |
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222 } |
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223 |
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224 impl From<DirstateV2ParseError> for crate::DirstateError { |
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225 fn from(error: DirstateV2ParseError) -> Self { |
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226 HgError::from(error).into() |
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227 } |
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228 } |
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229 |
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230 impl<'on_disk> Docket<'on_disk> { |
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231 pub fn parents(&self) -> DirstateParents { |
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232 use crate::Node; |
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233 let p1 = Node::try_from(&self.header.parent_1[..USED_NODE_ID_BYTES]) |
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234 .unwrap() |
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235 .clone(); |
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236 let p2 = Node::try_from(&self.header.parent_2[..USED_NODE_ID_BYTES]) |
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237 .unwrap() |
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238 .clone(); |
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239 DirstateParents { p1, p2 } |
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240 } |
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241 |
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242 pub fn data_size(&self) -> usize { |
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243 // This `unwrap` could only panic on a 16-bit CPU |
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244 self.header.data_size.get().try_into().unwrap() |
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245 } |
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246 |
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247 pub fn data_filename(&self) -> String { |
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248 String::from_utf8(format_bytes!(b"dirstate.{}.d", self.uuid)).unwrap() |
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249 } |
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250 } |
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251 |
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252 pub fn read_docket( |
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253 on_disk: &[u8], |
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254 ) -> Result<Docket<'_>, DirstateV2ParseError> { |
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255 let (header, uuid) = |
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256 DocketHeader::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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257 let uuid_size = header.uuid_size as usize; |
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258 if header.marker == *V2_FORMAT_MARKER && uuid.len() == uuid_size { |
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259 Ok(Docket { header, uuid }) |
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260 } else { |
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261 Err(DirstateV2ParseError) |
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262 } |
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263 } |
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264 |
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265 fn read_root<'on_disk>( |
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266 on_disk: &'on_disk [u8], |
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267 ) -> Result<&'on_disk Root, DirstateV2ParseError> { |
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268 // Find the `Root` at the end of the given slice |
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269 let root_offset = on_disk |
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270 .len() |
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271 .checked_sub(std::mem::size_of::<Root>()) |
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272 // A non-empty slice too short is an error |
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273 .ok_or(DirstateV2ParseError)?; |
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274 let (root, _) = Root::from_bytes(&on_disk[root_offset..]) |
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275 .map_err(|_| DirstateV2ParseError)?; |
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276 Ok(root) |
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277 } |
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278 |
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279 pub(super) fn read<'on_disk>( |
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280 on_disk: &'on_disk [u8], |
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281 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> { |
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282 if on_disk.is_empty() { |
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283 return Ok(DirstateMap::empty(on_disk)); |
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284 } |
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285 let root = read_root(on_disk)?; |
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286 let dirstate_map = DirstateMap { |
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287 on_disk, |
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288 root: dirstate_map::ChildNodes::OnDisk(read_nodes( |
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289 on_disk, |
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290 root.root_nodes, |
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291 )?), |
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292 nodes_with_entry_count: root.nodes_with_entry_count.get(), |
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293 nodes_with_copy_source_count: root.nodes_with_copy_source_count.get(), |
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294 ignore_patterns_hash: root.ignore_patterns_hash, |
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295 }; |
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296 Ok(dirstate_map) |
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297 } |
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298 |
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299 impl Node { |
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300 pub(super) fn full_path<'on_disk>( |
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301 &self, |
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302 on_disk: &'on_disk [u8], |
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303 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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304 read_hg_path(on_disk, self.full_path) |
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305 } |
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306 |
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307 pub(super) fn base_name_start<'on_disk>( |
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308 &self, |
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309 ) -> Result<usize, DirstateV2ParseError> { |
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310 let start = self.base_name_start.get(); |
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311 if start < self.full_path.len.get() { |
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312 let start = usize::try_from(start) |
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313 // u32 -> usize, could only panic on a 16-bit CPU |
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314 .expect("dirstate-v2 base_name_start out of bounds"); |
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315 Ok(start) |
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316 } else { |
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317 Err(DirstateV2ParseError) |
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318 } |
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319 } |
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320 |
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321 pub(super) fn base_name<'on_disk>( |
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322 &self, |
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323 on_disk: &'on_disk [u8], |
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324 ) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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325 let full_path = self.full_path(on_disk)?; |
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326 let base_name_start = self.base_name_start()?; |
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327 Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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328 } |
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329 |
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330 pub(super) fn path<'on_disk>( |
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331 &self, |
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332 on_disk: &'on_disk [u8], |
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333 ) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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334 Ok(WithBasename::from_raw_parts( |
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335 Cow::Borrowed(self.full_path(on_disk)?), |
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336 self.base_name_start()?, |
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337 )) |
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338 } |
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339 |
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340 pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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341 self.copy_source.start.get() != 0 |
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342 } |
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343 |
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344 pub(super) fn copy_source<'on_disk>( |
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345 &self, |
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346 on_disk: &'on_disk [u8], |
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347 ) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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348 Ok(if self.has_copy_source() { |
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349 Some(read_hg_path(on_disk, self.copy_source)?) |
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350 } else { |
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351 None |
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352 }) |
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353 } |
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354 |
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355 pub(super) fn node_data( |
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356 &self, |
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357 ) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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358 let entry = |state| { |
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359 dirstate_map::NodeData::Entry(self.entry_with_given_state(state)) |
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360 }; |
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361 |
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362 match self.state { |
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363 b'\0' => Ok(dirstate_map::NodeData::None), |
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364 b'd' => Ok(dirstate_map::NodeData::CachedDirectory { |
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365 mtime: *self.data.as_timestamp(), |
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366 }), |
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367 b'n' => Ok(entry(EntryState::Normal)), |
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368 b'a' => Ok(entry(EntryState::Added)), |
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369 b'r' => Ok(entry(EntryState::Removed)), |
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370 b'm' => Ok(entry(EntryState::Merged)), |
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371 _ => Err(DirstateV2ParseError), |
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372 } |
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373 } |
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374 |
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375 pub(super) fn cached_directory_mtime(&self) -> Option<&Timestamp> { |
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376 if self.state == b'd' { |
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377 Some(self.data.as_timestamp()) |
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378 } else { |
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379 None |
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380 } |
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381 } |
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382 |
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383 pub(super) fn state( |
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384 &self, |
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385 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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386 match self.state { |
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387 b'\0' | b'd' => Ok(None), |
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388 b'n' => Ok(Some(EntryState::Normal)), |
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389 b'a' => Ok(Some(EntryState::Added)), |
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390 b'r' => Ok(Some(EntryState::Removed)), |
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391 b'm' => Ok(Some(EntryState::Merged)), |
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392 _ => Err(DirstateV2ParseError), |
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393 } |
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394 } |
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395 |
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396 fn entry_with_given_state(&self, state: EntryState) -> DirstateEntry { |
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397 DirstateEntry { |
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398 state, |
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399 mode: self.data.mode.get(), |
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400 mtime: self.data.mtime.get(), |
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401 size: self.data.size.get(), |
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402 } |
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403 } |
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404 |
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405 pub(super) fn entry( |
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406 &self, |
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407 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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408 Ok(self |
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409 .state()? |
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410 .map(|state| self.entry_with_given_state(state))) |
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411 } |
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412 |
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413 pub(super) fn children<'on_disk>( |
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414 &self, |
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415 on_disk: &'on_disk [u8], |
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416 ) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
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417 read_nodes(on_disk, self.children) |
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418 } |
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419 |
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420 pub(super) fn to_in_memory_node<'on_disk>( |
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421 &self, |
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422 on_disk: &'on_disk [u8], |
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423 ) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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424 Ok(dirstate_map::Node { |
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425 children: dirstate_map::ChildNodes::OnDisk( |
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426 self.children(on_disk)?, |
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427 ), |
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428 copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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429 data: self.node_data()?, |
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430 descendants_with_entry_count: self |
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431 .descendants_with_entry_count |
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432 .get(), |
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433 tracked_descendants_count: self.tracked_descendants_count.get(), |
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434 }) |
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435 } |
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436 } |
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437 |
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438 impl Entry { |
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439 fn from_timestamp(timestamp: Timestamp) -> Self { |
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440 // Safety: both types implement the `ByteCast` trait, so we could |
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441 // safely use `as_bytes` and `from_bytes` to do this conversion. Using |
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442 // `transmute` instead makes the compiler check that the two types |
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443 // have the same size, which eliminates the error case of |
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444 // `from_bytes`. |
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445 unsafe { std::mem::transmute::<Timestamp, Entry>(timestamp) } |
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446 } |
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447 |
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448 fn as_timestamp(&self) -> &Timestamp { |
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449 // Safety: same as above in `from_timestamp` |
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450 unsafe { &*(self as *const Entry as *const Timestamp) } |
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451 } |
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452 } |
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453 |
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454 impl Timestamp { |
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455 pub fn seconds(&self) -> i64 { |
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456 self.seconds.get() |
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457 } |
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458 } |
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459 |
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460 impl From<SystemTime> for Timestamp { |
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461 fn from(system_time: SystemTime) -> Self { |
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462 let (secs, nanos) = match system_time.duration_since(UNIX_EPOCH) { |
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463 Ok(duration) => { |
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464 (duration.as_secs() as i64, duration.subsec_nanos()) |
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465 } |
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466 Err(error) => { |
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467 let negative = error.duration(); |
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468 (-(negative.as_secs() as i64), negative.subsec_nanos()) |
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469 } |
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470 }; |
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471 Timestamp { |
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472 seconds: secs.into(), |
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473 nanoseconds: nanos.into(), |
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474 } |
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475 } |
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476 } |
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477 |
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478 impl From<&'_ Timestamp> for SystemTime { |
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479 fn from(timestamp: &'_ Timestamp) -> Self { |
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480 let secs = timestamp.seconds.get(); |
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481 let nanos = timestamp.nanoseconds.get(); |
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482 if secs >= 0 { |
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483 UNIX_EPOCH + Duration::new(secs as u64, nanos) |
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484 } else { |
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485 UNIX_EPOCH - Duration::new((-secs) as u64, nanos) |
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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 fn read_hg_path( |
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491 on_disk: &[u8], |
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492 slice: PathSlice, |
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493 ) -> Result<&HgPath, DirstateV2ParseError> { |
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494 read_slice(on_disk, slice.start, slice.len.get()).map(HgPath::new) |
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495 } |
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496 |
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497 fn read_nodes( |
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498 on_disk: &[u8], |
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499 slice: ChildNodes, |
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500 ) -> Result<&[Node], DirstateV2ParseError> { |
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501 read_slice(on_disk, slice.start, slice.len.get()) |
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502 } |
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503 |
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504 fn read_slice<T, Len>( |
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505 on_disk: &[u8], |
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506 start: Offset, |
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507 len: Len, |
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508 ) -> Result<&[T], DirstateV2ParseError> |
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509 where |
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510 T: BytesCast, |
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511 Len: TryInto<usize>, |
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512 { |
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513 // Either `usize::MAX` would result in "out of bounds" error since a single |
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514 // `&[u8]` cannot occupy the entire addess space. |
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515 let start = start.get().try_into().unwrap_or(std::usize::MAX); |
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516 let len = len.try_into().unwrap_or(std::usize::MAX); |
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517 on_disk |
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518 .get(start..) |
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519 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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520 .map(|(slice, _rest)| slice) |
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521 .ok_or_else(|| DirstateV2ParseError) |
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522 } |
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523 |
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524 pub(crate) fn for_each_tracked_path<'on_disk>( |
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525 on_disk: &'on_disk [u8], |
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526 mut f: impl FnMut(&'on_disk HgPath), |
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527 ) -> Result<(), DirstateV2ParseError> { |
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528 let root = read_root(on_disk)?; |
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529 fn recur<'on_disk>( |
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530 on_disk: &'on_disk [u8], |
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531 nodes: ChildNodes, |
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532 f: &mut impl FnMut(&'on_disk HgPath), |
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533 ) -> Result<(), DirstateV2ParseError> { |
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534 for node in read_nodes(on_disk, nodes)? { |
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535 if let Some(state) = node.state()? { |
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536 if state.is_tracked() { |
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537 f(node.full_path(on_disk)?) |
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538 } |
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539 } |
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540 recur(on_disk, node.children, f)? |
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541 } |
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542 Ok(()) |
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543 } |
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544 recur(on_disk, root.root_nodes, &mut f) |
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545 } |
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546 |
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547 /// Returns new data together with whether that data should be appended to the |
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548 /// existing data file whose content is at `dirstate_map.on_disk` (true), |
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549 /// instead of written to a new data file (false). |
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550 pub(super) fn write( |
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551 dirstate_map: &mut DirstateMap, |
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552 can_append: bool, |
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553 ) -> Result<(Vec<u8>, bool), DirstateError> { |
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554 let append = can_append && dirstate_map.write_should_append(); |
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555 |
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556 // This ignores the space for paths, and for nodes without an entry. |
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557 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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558 let size_guess = std::mem::size_of::<Root>() |
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559 + std::mem::size_of::<Node>() |
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560 * dirstate_map.nodes_with_entry_count as usize; |
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561 |
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562 let mut writer = Writer { |
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563 dirstate_map, |
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564 append, |
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565 out: Vec::with_capacity(size_guess), |
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566 }; |
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567 |
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568 let root_nodes = writer.write_nodes(dirstate_map.root.as_ref())?; |
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569 |
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570 let root = Root { |
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571 root_nodes, |
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572 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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573 nodes_with_copy_source_count: dirstate_map |
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574 .nodes_with_copy_source_count |
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575 .into(), |
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576 ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
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577 }; |
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578 writer.out.extend(root.as_bytes()); |
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579 Ok((writer.out, append)) |
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580 } |
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581 |
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582 struct Writer<'dmap, 'on_disk> { |
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583 dirstate_map: &'dmap DirstateMap<'on_disk>, |
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584 append: bool, |
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585 out: Vec<u8>, |
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586 } |
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587 |
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588 impl Writer<'_, '_> { |
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589 fn write_nodes( |
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590 &mut self, |
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591 nodes: dirstate_map::ChildNodesRef, |
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592 ) -> Result<ChildNodes, DirstateError> { |
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593 // Reuse already-written nodes if possible |
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594 if self.append { |
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595 if let dirstate_map::ChildNodesRef::OnDisk(nodes_slice) = nodes { |
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596 let start = self.offset_of(nodes_slice); |
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597 let len = child_nodes_len_from_usize(nodes_slice.len()); |
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598 return Ok(ChildNodes { start, len }); |
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599 } |
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600 } |
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601 |
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602 // `dirstate_map::ChildNodes::InMemory` contains a `HashMap` which has |
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603 // undefined iteration order. Sort to enable binary search in the |
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604 // written file. |
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605 let nodes = nodes.sorted(); |
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606 let nodes_len = nodes.len(); |
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607 |
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608 // First accumulate serialized nodes in a `Vec` |
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609 let mut on_disk_nodes = Vec::with_capacity(nodes_len); |
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610 for node in nodes { |
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611 let children = |
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612 self.write_nodes(node.children(self.dirstate_map.on_disk)?)?; |
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613 let full_path = node.full_path(self.dirstate_map.on_disk)?; |
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614 let full_path = self.write_path(full_path.as_bytes()); |
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615 let copy_source = if let Some(source) = |
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616 node.copy_source(self.dirstate_map.on_disk)? |
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617 { |
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618 self.write_path(source.as_bytes()) |
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619 } else { |
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620 PathSlice { |
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621 start: 0.into(), |
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622 len: 0.into(), |
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623 } |
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624 }; |
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625 on_disk_nodes.push(match node { |
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626 NodeRef::InMemory(path, node) => { |
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627 let (state, data) = match &node.data { |
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628 dirstate_map::NodeData::Entry(entry) => ( |
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629 entry.state.into(), |
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630 Entry { |
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631 mode: entry.mode.into(), |
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632 mtime: entry.mtime.into(), |
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633 size: entry.size.into(), |
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634 }, |
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635 ), |
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636 dirstate_map::NodeData::CachedDirectory { mtime } => { |
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637 (b'd', Entry::from_timestamp(*mtime)) |
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638 } |
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639 dirstate_map::NodeData::None => ( |
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640 b'\0', |
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641 Entry { |
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642 mode: 0.into(), |
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643 mtime: 0.into(), |
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644 size: 0.into(), |
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645 }, |
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646 ), |
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647 }; |
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648 Node { |
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649 children, |
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650 copy_source, |
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651 full_path, |
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652 base_name_start: u16::try_from(path.base_name_start()) |
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653 // Could only panic for paths over 64 KiB |
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654 .expect("dirstate-v2 path length overflow") |
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655 .into(), |
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656 descendants_with_entry_count: node |
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657 .descendants_with_entry_count |
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658 .into(), |
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659 tracked_descendants_count: node |
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660 .tracked_descendants_count |
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661 .into(), |
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662 state, |
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663 data, |
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664 } |
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665 } |
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666 NodeRef::OnDisk(node) => Node { |
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667 children, |
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668 copy_source, |
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669 full_path, |
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670 ..*node |
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671 }, |
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672 }) |
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673 } |
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674 // … so we can write them contiguously, after writing everything else |
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675 // they refer to. |
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676 let start = self.current_offset(); |
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677 let len = child_nodes_len_from_usize(nodes_len); |
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678 self.out.extend(on_disk_nodes.as_bytes()); |
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679 Ok(ChildNodes { start, len }) |
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680 } |
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681 |
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682 /// Takes a slice of items within `on_disk` and returns its offset for the |
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683 /// start of `on_disk`. |
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684 /// |
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685 /// Panics if the given slice is not within `on_disk`. |
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686 fn offset_of<T>(&self, slice: &[T]) -> Offset |
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687 where |
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688 T: BytesCast, |
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689 { |
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690 fn address_range(slice: &[u8]) -> std::ops::RangeInclusive<usize> { |
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691 let start = slice.as_ptr() as usize; |
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692 let end = start + slice.len(); |
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693 start..=end |
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694 } |
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695 let slice_addresses = address_range(slice.as_bytes()); |
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696 let on_disk_addresses = address_range(self.dirstate_map.on_disk); |
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697 assert!(on_disk_addresses.contains(slice_addresses.start())); |
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698 assert!(on_disk_addresses.contains(slice_addresses.end())); |
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699 let offset = slice_addresses.start() - on_disk_addresses.start(); |
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700 offset_from_usize(offset) |
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701 } |
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702 |
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703 fn current_offset(&mut self) -> Offset { |
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704 let mut offset = self.out.len(); |
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705 if self.append { |
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706 offset += self.dirstate_map.on_disk.len() |
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707 } |
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708 offset_from_usize(offset) |
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709 } |
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710 |
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711 fn write_path(&mut self, slice: &[u8]) -> PathSlice { |
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712 let start = self.current_offset(); |
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713 let len = path_len_from_usize(slice.len()); |
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714 self.out.extend(slice.as_bytes()); |
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715 PathSlice { start, len } |
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716 } |
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717 } |
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718 |
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719 fn offset_from_usize(x: usize) -> Offset { |
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720 u32::try_from(x) |
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721 // Could only panic for a dirstate file larger than 4 GiB |
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722 .expect("dirstate-v2 offset overflow") |
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723 .into() |
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724 } |
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725 |
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726 fn child_nodes_len_from_usize(x: usize) -> Size { |
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727 u32::try_from(x) |
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728 // Could only panic with over 4 billion nodes |
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729 .expect("dirstate-v2 slice length overflow") |
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730 .into() |
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731 } |
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732 |
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733 fn path_len_from_usize(x: usize) -> PathSize { |
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734 u16::try_from(x) |
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735 // Could only panic for paths over 64 KiB |
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736 .expect("dirstate-v2 path length overflow") |
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737 .into() |
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738 } |