author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 28 Jun 2021 15:41:50 +0200 | |
changeset 47476 | f23eafb036af |
parent 47475 | 94e38822d395 |
child 47478 | ca8121d26732 |
permissions | -rw-r--r-- |
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//! The "version 2" disk representation of the dirstate |
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//! |
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//! # File format |
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//! |
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//! The file starts with a fixed-sized header, whose layout is defined by the |
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//! `Header` struct. Its `root` field contains the slice (offset and length) to |
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//! the nodes representing the files and directories at the root of the |
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//! repository. Each node is also fixed-size, defined by the `Node` struct. |
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//! Nodes in turn contain slices to variable-size paths, and to their own child |
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//! nodes (if any) for nested files and directories. |
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use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef}; |
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use crate::dirstate_tree::path_with_basename::WithBasename; |
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use crate::errors::HgError; |
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use crate::utils::hg_path::HgPath; |
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use crate::DirstateEntry; |
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use crate::DirstateError; |
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use crate::DirstateParents; |
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use crate::EntryState; |
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use bytes_cast::unaligned::{I32Be, I64Be, U32Be}; |
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use bytes_cast::BytesCast; |
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use std::borrow::Cow; |
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use std::convert::TryFrom; |
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use std::time::{Duration, SystemTime, UNIX_EPOCH}; |
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/// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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/// This a redundant sanity check more than an actual "magic number" since |
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/// `.hg/requires` already governs which format should be used. |
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pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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pub(super) const IGNORE_PATTERNS_HASH_LEN: usize = 20; |
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pub(super) type IgnorePatternsHash = [u8; IGNORE_PATTERNS_HASH_LEN]; |
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#[derive(BytesCast)] |
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#[repr(C)] |
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struct Header { |
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marker: [u8; V2_FORMAT_MARKER.len()], |
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/// `dirstatemap.parents()` in `mercurial/dirstate.py` relies on this |
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/// `parents` field being at this offset, immediately after `marker`. |
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parents: DirstateParents, |
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|
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root: ChildNodes, |
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nodes_with_entry_count: Size, |
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nodes_with_copy_source_count: Size, |
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/// If non-zero, a hash of ignore files that were used for some previous |
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/// run of the `status` algorithm. |
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/// |
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/// We define: |
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/// |
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/// * "Root" ignore files are `.hgignore` at the root of the repository if |
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/// it exists, and files from `ui.ignore.*` config. This set of files is |
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/// then sorted by the string representation of their path. |
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/// * The "expanded contents" of an ignore files is the byte string made |
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/// by concatenating its contents with the "expanded contents" of other |
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/// files included with `include:` or `subinclude:` files, in inclusion |
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/// order. This definition is recursive, as included files can |
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/// themselves include more files. |
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/// |
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/// This hash is defined as the SHA-1 of the concatenation (in sorted |
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/// order) of the "expanded contents" of each "root" ignore file. |
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/// (Note that computing this does not require actually concatenating byte |
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/// strings into contiguous memory, instead SHA-1 hashing can be done |
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/// incrementally.) |
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ignore_patterns_hash: IgnorePatternsHash, |
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} |
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#[derive(BytesCast)] |
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#[repr(C)] |
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pub(super) struct Node { |
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full_path: PathSlice, |
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/// In bytes from `self.full_path.start` |
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base_name_start: Size, |
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copy_source: OptPathSlice, |
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children: ChildNodes, |
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pub(super) tracked_descendants_count: Size, |
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/// Dependending on the value of `state`: |
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/// |
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/// * A null byte: `data` is not used. |
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/// |
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/// * A `n`, `a`, `r`, or `m` ASCII byte: `state` and `data` together |
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/// represent a dirstate entry like in the v1 format. |
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/// |
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/// * A `d` ASCII byte: the bytes of `data` should instead be interpreted |
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/// as the `Timestamp` for the mtime of a cached directory. |
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/// |
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/// The presence of this state means that at some point, this path in |
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/// the working directory was observed: |
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/// |
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/// - To be a directory |
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95 |
/// - With the modification time as given by `Timestamp` |
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96 |
/// - That timestamp was already strictly in the past when observed, |
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97 |
/// meaning that later changes cannot happen in the same clock tick |
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98 |
/// and must cause a different modification time (unless the system |
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99 |
/// clock jumps back and we get unlucky, which is not impossible but |
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/// but deemed unlikely enough). |
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101 |
/// - All direct children of this directory (as returned by |
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102 |
/// `std::fs::read_dir`) either have a corresponding dirstate node, or |
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103 |
/// are ignored by ignore patterns whose hash is in |
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104 |
/// `Header::ignore_patterns_hash`. |
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105 |
/// |
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106 |
/// This means that if `std::fs::symlink_metadata` later reports the |
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107 |
/// same modification time and ignored patterns haven’t changed, a run |
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108 |
/// of status that is not listing ignored files can skip calling |
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109 |
/// `std::fs::read_dir` again for this directory, iterate child |
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110 |
/// dirstate nodes instead. |
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111 |
state: u8, |
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112 |
data: Entry, |
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113 |
} |
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114 |
|
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115 |
#[derive(BytesCast, Copy, Clone)] |
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116 |
#[repr(C)] |
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117 |
struct Entry { |
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118 |
mode: I32Be, |
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119 |
mtime: I32Be, |
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120 |
size: I32Be, |
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121 |
} |
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122 |
|
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123 |
/// Duration since the Unix epoch |
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#[derive(BytesCast, Copy, Clone, PartialEq)] |
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125 |
#[repr(C)] |
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126 |
pub(super) struct Timestamp { |
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127 |
seconds: I64Be, |
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128 |
|
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/// In `0 .. 1_000_000_000`. |
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130 |
/// |
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131 |
/// This timestamp is later or earlier than `(seconds, 0)` by this many |
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/// nanoseconds, if `seconds` is non-negative or negative, respectively. |
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133 |
nanoseconds: U32Be, |
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134 |
} |
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135 |
|
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136 |
/// Counted in bytes from the start of the file |
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137 |
/// |
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138 |
/// NOTE: not supporting `.hg/dirstate` files larger than 4 GiB. |
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139 |
type Offset = U32Be; |
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140 |
|
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141 |
/// Counted in number of items |
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142 |
/// |
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143 |
/// NOTE: not supporting directories with more than 4 billion direct children, |
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144 |
/// or filenames more than 4 GiB. |
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145 |
type Size = U32Be; |
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146 |
|
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147 |
/// Location of consecutive, fixed-size items. |
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148 |
/// |
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149 |
/// An item can be a single byte for paths, or a struct with |
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150 |
/// `derive(BytesCast)`. |
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151 |
#[derive(BytesCast, Copy, Clone)] |
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152 |
#[repr(C)] |
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153 |
struct Slice { |
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154 |
start: Offset, |
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155 |
len: Size, |
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156 |
} |
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157 |
|
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158 |
/// A contiguous sequence of `len` times `Node`, representing the child nodes |
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159 |
/// of either some other node or of the repository root. |
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160 |
/// |
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161 |
/// Always sorted by ascending `full_path`, to allow binary search. |
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162 |
/// Since nodes with the same parent nodes also have the same parent path, |
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163 |
/// only the `base_name`s need to be compared during binary search. |
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164 |
type ChildNodes = Slice; |
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165 |
|
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166 |
/// A `HgPath` of `len` bytes |
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167 |
type PathSlice = Slice; |
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168 |
|
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169 |
/// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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170 |
type OptPathSlice = Slice; |
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171 |
|
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172 |
/// Make sure that size-affecting changes are made knowingly |
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173 |
fn _static_assert_size_of() { |
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174 |
let _ = std::mem::transmute::<Header, [u8; 88]>; |
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175 |
let _ = std::mem::transmute::<Node, [u8; 45]>; |
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176 |
} |
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177 |
|
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178 |
/// Unexpected file format found in `.hg/dirstate` with the "v2" format. |
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179 |
/// |
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180 |
/// This should only happen if Mercurial is buggy or a repository is corrupted. |
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181 |
#[derive(Debug)] |
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182 |
pub struct DirstateV2ParseError; |
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183 |
|
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184 |
impl From<DirstateV2ParseError> for HgError { |
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185 |
fn from(_: DirstateV2ParseError) -> Self { |
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186 |
HgError::corrupted("dirstate-v2 parse error") |
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187 |
} |
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188 |
} |
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189 |
|
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190 |
impl From<DirstateV2ParseError> for crate::DirstateError { |
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191 |
fn from(error: DirstateV2ParseError) -> Self { |
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HgError::from(error).into() |
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193 |
} |
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194 |
} |
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195 |
|
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fn read_header(on_disk: &[u8]) -> Result<&Header, DirstateV2ParseError> { |
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197 |
let (header, _) = |
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Header::from_bytes(on_disk).map_err(|_| DirstateV2ParseError)?; |
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199 |
if header.marker == *V2_FORMAT_MARKER { |
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Ok(header) |
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201 |
} else { |
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Err(DirstateV2ParseError) |
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203 |
} |
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204 |
} |
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205 |
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206 |
pub(super) fn read<'on_disk>( |
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on_disk: &'on_disk [u8], |
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208 |
) -> Result< |
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209 |
(DirstateMap<'on_disk>, Option<DirstateParents>), |
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210 |
DirstateV2ParseError, |
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211 |
> { |
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212 |
if on_disk.is_empty() { |
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return Ok((DirstateMap::empty(on_disk), None)); |
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214 |
} |
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215 |
let header = read_header(on_disk)?; |
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216 |
let dirstate_map = DirstateMap { |
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217 |
on_disk, |
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218 |
root: dirstate_map::ChildNodes::OnDisk(read_slice::<Node>( |
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219 |
on_disk, |
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220 |
header.root, |
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221 |
)?), |
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222 |
nodes_with_entry_count: header.nodes_with_entry_count.get(), |
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223 |
nodes_with_copy_source_count: header |
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224 |
.nodes_with_copy_source_count |
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225 |
.get(), |
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226 |
ignore_patterns_hash: header.ignore_patterns_hash, |
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227 |
}; |
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228 |
let parents = Some(header.parents.clone()); |
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229 |
Ok((dirstate_map, parents)) |
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230 |
} |
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231 |
|
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232 |
impl Node { |
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233 |
pub(super) fn full_path<'on_disk>( |
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234 |
&self, |
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235 |
on_disk: &'on_disk [u8], |
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236 |
) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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237 |
read_hg_path(on_disk, self.full_path) |
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238 |
} |
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|
239 |
|
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240 |
pub(super) fn base_name_start<'on_disk>( |
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241 |
&self, |
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242 |
) -> Result<usize, DirstateV2ParseError> { |
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243 |
let start = self.base_name_start.get(); |
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244 |
if start < self.full_path.len.get() { |
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245 |
let start = usize::try_from(start) |
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246 |
// u32 -> usize, could only panic on a 16-bit CPU |
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247 |
.expect("dirstate-v2 base_name_start out of bounds"); |
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248 |
Ok(start) |
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249 |
} else { |
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250 |
Err(DirstateV2ParseError) |
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251 |
} |
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252 |
} |
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253 |
|
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254 |
pub(super) fn base_name<'on_disk>( |
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255 |
&self, |
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256 |
on_disk: &'on_disk [u8], |
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257 |
) -> Result<&'on_disk HgPath, DirstateV2ParseError> { |
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258 |
let full_path = self.full_path(on_disk)?; |
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259 |
let base_name_start = self.base_name_start()?; |
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260 |
Ok(HgPath::new(&full_path.as_bytes()[base_name_start..])) |
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|
261 |
} |
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|
262 |
|
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263 |
pub(super) fn path<'on_disk>( |
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|
264 |
&self, |
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|
265 |
on_disk: &'on_disk [u8], |
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|
266 |
) -> Result<dirstate_map::NodeKey<'on_disk>, DirstateV2ParseError> { |
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267 |
Ok(WithBasename::from_raw_parts( |
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268 |
Cow::Borrowed(self.full_path(on_disk)?), |
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|
269 |
self.base_name_start()?, |
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|
270 |
)) |
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|
271 |
} |
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|
272 |
|
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273 |
pub(super) fn has_copy_source<'on_disk>(&self) -> bool { |
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274 |
self.copy_source.start.get() != 0 |
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275 |
} |
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276 |
|
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277 |
pub(super) fn copy_source<'on_disk>( |
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278 |
&self, |
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279 |
on_disk: &'on_disk [u8], |
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280 |
) -> Result<Option<&'on_disk HgPath>, DirstateV2ParseError> { |
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281 |
Ok(if self.has_copy_source() { |
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282 |
Some(read_hg_path(on_disk, self.copy_source)?) |
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283 |
} else { |
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284 |
None |
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285 |
}) |
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286 |
} |
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287 |
|
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288 |
pub(super) fn node_data( |
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289 |
&self, |
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290 |
) -> Result<dirstate_map::NodeData, DirstateV2ParseError> { |
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291 |
let entry = |state| { |
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292 |
dirstate_map::NodeData::Entry(self.entry_with_given_state(state)) |
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293 |
}; |
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294 |
|
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295 |
match self.state { |
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296 |
b'\0' => Ok(dirstate_map::NodeData::None), |
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297 |
b'd' => Ok(dirstate_map::NodeData::CachedDirectory { |
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298 |
mtime: *self.data.as_timestamp(), |
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299 |
}), |
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300 |
b'n' => Ok(entry(EntryState::Normal)), |
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301 |
b'a' => Ok(entry(EntryState::Added)), |
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302 |
b'r' => Ok(entry(EntryState::Removed)), |
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303 |
b'm' => Ok(entry(EntryState::Merged)), |
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304 |
_ => Err(DirstateV2ParseError), |
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305 |
} |
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306 |
} |
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307 |
|
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308 |
pub(super) fn cached_directory_mtime(&self) -> Option<&Timestamp> { |
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309 |
if self.state == b'd' { |
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310 |
Some(self.data.as_timestamp()) |
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311 |
} else { |
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312 |
None |
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313 |
} |
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314 |
} |
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315 |
|
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316 |
pub(super) fn state( |
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317 |
&self, |
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318 |
) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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319 |
match self.state { |
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320 |
b'\0' | b'd' => Ok(None), |
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321 |
b'n' => Ok(Some(EntryState::Normal)), |
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322 |
b'a' => Ok(Some(EntryState::Added)), |
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323 |
b'r' => Ok(Some(EntryState::Removed)), |
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324 |
b'm' => Ok(Some(EntryState::Merged)), |
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325 |
_ => Err(DirstateV2ParseError), |
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326 |
} |
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327 |
} |
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328 |
|
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329 |
fn entry_with_given_state(&self, state: EntryState) -> DirstateEntry { |
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330 |
DirstateEntry { |
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331 |
state, |
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332 |
mode: self.data.mode.get(), |
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333 |
mtime: self.data.mtime.get(), |
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334 |
size: self.data.size.get(), |
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335 |
} |
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336 |
} |
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337 |
|
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338 |
pub(super) fn entry( |
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339 |
&self, |
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340 |
) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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|
341 |
Ok(self |
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342 |
.state()? |
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343 |
.map(|state| self.entry_with_given_state(state))) |
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|
344 |
} |
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|
345 |
|
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346 |
pub(super) fn children<'on_disk>( |
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347 |
&self, |
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348 |
on_disk: &'on_disk [u8], |
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349 |
) -> Result<&'on_disk [Node], DirstateV2ParseError> { |
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350 |
read_slice::<Node>(on_disk, self.children) |
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351 |
} |
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|
352 |
|
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353 |
pub(super) fn to_in_memory_node<'on_disk>( |
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354 |
&self, |
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355 |
on_disk: &'on_disk [u8], |
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|
356 |
) -> Result<dirstate_map::Node<'on_disk>, DirstateV2ParseError> { |
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357 |
Ok(dirstate_map::Node { |
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358 |
children: dirstate_map::ChildNodes::OnDisk( |
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|
359 |
self.children(on_disk)?, |
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|
360 |
), |
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|
361 |
copy_source: self.copy_source(on_disk)?.map(Cow::Borrowed), |
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362 |
data: self.node_data()?, |
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363 |
tracked_descendants_count: self.tracked_descendants_count.get(), |
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|
364 |
}) |
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365 |
} |
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366 |
} |
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367 |
|
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368 |
impl Entry { |
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369 |
fn from_timestamp(timestamp: Timestamp) -> Self { |
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370 |
// Safety: both types implement the `ByteCast` trait, so we could |
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371 |
// safely use `as_bytes` and `from_bytes` to do this conversion. Using |
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372 |
// `transmute` instead makes the compiler check that the two types |
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373 |
// have the same size, which eliminates the error case of |
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374 |
// `from_bytes`. |
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375 |
unsafe { std::mem::transmute::<Timestamp, Entry>(timestamp) } |
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376 |
} |
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377 |
|
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378 |
fn as_timestamp(&self) -> &Timestamp { |
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379 |
// Safety: same as above in `from_timestamp` |
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380 |
unsafe { &*(self as *const Entry as *const Timestamp) } |
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|
381 |
} |
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|
382 |
} |
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|
383 |
|
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|
384 |
impl Timestamp { |
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|
385 |
pub fn seconds(&self) -> i64 { |
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|
386 |
self.seconds.get() |
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|
387 |
} |
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|
388 |
} |
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|
389 |
|
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|
390 |
impl From<SystemTime> for Timestamp { |
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|
391 |
fn from(system_time: SystemTime) -> Self { |
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|
392 |
let (secs, nanos) = match system_time.duration_since(UNIX_EPOCH) { |
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|
393 |
Ok(duration) => { |
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|
394 |
(duration.as_secs() as i64, duration.subsec_nanos()) |
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|
395 |
} |
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|
396 |
Err(error) => { |
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|
397 |
let negative = error.duration(); |
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|
398 |
(-(negative.as_secs() as i64), negative.subsec_nanos()) |
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|
399 |
} |
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|
400 |
}; |
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|
401 |
Timestamp { |
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|
402 |
seconds: secs.into(), |
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|
403 |
nanoseconds: nanos.into(), |
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|
404 |
} |
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|
405 |
} |
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changeset
|
406 |
} |
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changeset
|
407 |
|
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changeset
|
408 |
impl From<&'_ Timestamp> for SystemTime { |
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|
409 |
fn from(timestamp: &'_ Timestamp) -> Self { |
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|
410 |
let secs = timestamp.seconds.get(); |
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|
411 |
let nanos = timestamp.nanoseconds.get(); |
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|
412 |
if secs >= 0 { |
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changeset
|
413 |
UNIX_EPOCH + Duration::new(secs as u64, nanos) |
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changeset
|
414 |
} else { |
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changeset
|
415 |
UNIX_EPOCH - Duration::new((-secs) as u64, nanos) |
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changeset
|
416 |
} |
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|
417 |
} |
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|
418 |
} |
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|
419 |
|
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|
420 |
fn read_hg_path( |
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|
421 |
on_disk: &[u8], |
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|
422 |
slice: Slice, |
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|
423 |
) -> Result<&HgPath, DirstateV2ParseError> { |
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|
424 |
let bytes = read_slice::<u8>(on_disk, slice)?; |
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|
425 |
Ok(HgPath::new(bytes)) |
47283
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changeset
|
426 |
} |
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changeset
|
427 |
|
47334
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changeset
|
428 |
fn read_slice<T>( |
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|
429 |
on_disk: &[u8], |
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changeset
|
430 |
slice: Slice, |
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changeset
|
431 |
) -> Result<&[T], DirstateV2ParseError> |
47283
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|
432 |
where |
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changeset
|
433 |
T: BytesCast, |
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changeset
|
434 |
{ |
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changeset
|
435 |
// Either `usize::MAX` would result in "out of bounds" error since a single |
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|
436 |
// `&[u8]` cannot occupy the entire addess space. |
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changeset
|
437 |
let start = usize::try_from(slice.start.get()).unwrap_or(std::usize::MAX); |
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|
438 |
let len = usize::try_from(slice.len.get()).unwrap_or(std::usize::MAX); |
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changeset
|
439 |
on_disk |
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|
440 |
.get(start..) |
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changeset
|
441 |
.and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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changeset
|
442 |
.map(|(slice, _rest)| slice) |
47334
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changeset
|
443 |
.ok_or_else(|| DirstateV2ParseError) |
47283
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changeset
|
444 |
} |
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changeset
|
445 |
|
47374
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changeset
|
446 |
pub(crate) fn parse_dirstate_parents( |
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changeset
|
447 |
on_disk: &[u8], |
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changeset
|
448 |
) -> Result<&DirstateParents, HgError> { |
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changeset
|
449 |
Ok(&read_header(on_disk)?.parents) |
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changeset
|
450 |
} |
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changeset
|
451 |
|
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changeset
|
452 |
pub(crate) fn for_each_tracked_path<'on_disk>( |
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changeset
|
453 |
on_disk: &'on_disk [u8], |
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changeset
|
454 |
mut f: impl FnMut(&'on_disk HgPath), |
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changeset
|
455 |
) -> Result<(), DirstateV2ParseError> { |
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changeset
|
456 |
let header = read_header(on_disk)?; |
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changeset
|
457 |
fn recur<'on_disk>( |
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changeset
|
458 |
on_disk: &'on_disk [u8], |
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changeset
|
459 |
nodes: Slice, |
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changeset
|
460 |
f: &mut impl FnMut(&'on_disk HgPath), |
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changeset
|
461 |
) -> Result<(), DirstateV2ParseError> { |
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changeset
|
462 |
for node in read_slice::<Node>(on_disk, nodes)? { |
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changeset
|
463 |
if let Some(state) = node.state()? { |
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changeset
|
464 |
if state.is_tracked() { |
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changeset
|
465 |
f(node.full_path(on_disk)?) |
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changeset
|
466 |
} |
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changeset
|
467 |
} |
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changeset
|
468 |
recur(on_disk, node.children, f)? |
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changeset
|
469 |
} |
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changeset
|
470 |
Ok(()) |
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changeset
|
471 |
} |
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changeset
|
472 |
recur(on_disk, header.root, &mut f) |
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changeset
|
473 |
} |
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changeset
|
474 |
|
47283
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changeset
|
475 |
pub(super) fn write( |
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changeset
|
476 |
dirstate_map: &mut DirstateMap, |
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changeset
|
477 |
parents: DirstateParents, |
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changeset
|
478 |
) -> Result<Vec<u8>, DirstateError> { |
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changeset
|
479 |
let header_len = std::mem::size_of::<Header>(); |
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changeset
|
480 |
|
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changeset
|
481 |
// This ignores the space for paths, and for nodes without an entry. |
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changeset
|
482 |
// TODO: better estimate? Skip the `Vec` and write to a file directly? |
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changeset
|
483 |
let size_guess = header_len |
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changeset
|
484 |
+ std::mem::size_of::<Node>() |
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changeset
|
485 |
* dirstate_map.nodes_with_entry_count as usize; |
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changeset
|
486 |
let mut out = Vec::with_capacity(size_guess); |
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changeset
|
487 |
|
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changeset
|
488 |
// Keep space for the header. We’ll fill it out at the end when we know the |
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changeset
|
489 |
// actual offset for the root nodes. |
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changeset
|
490 |
out.resize(header_len, 0_u8); |
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dirstate-v2: Change the on-disk format to be tree-shaped
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diff
changeset
|
491 |
|
47336
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Simon Sapin <simon.sapin@octobus.net>
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changeset
|
492 |
let root = |
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dirstate-v2: Make the dirstate bytes buffer available in more places
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changeset
|
493 |
write_nodes(dirstate_map, dirstate_map.root.as_ref(), &mut out)?; |
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changeset
|
494 |
|
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
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diff
changeset
|
495 |
let header = Header { |
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changeset
|
496 |
marker: *V2_FORMAT_MARKER, |
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dirstate-v2: Change the on-disk format to be tree-shaped
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changeset
|
497 |
parents: parents, |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
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changeset
|
498 |
root, |
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changeset
|
499 |
nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
2a9ddc8094c7
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Simon Sapin <simon.sapin@octobus.net>
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changeset
|
500 |
nodes_with_copy_source_count: dirstate_map |
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changeset
|
501 |
.nodes_with_copy_source_count |
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parents:
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changeset
|
502 |
.into(), |
47409
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dirstate-v2: Store a hash of ignore patterns (.hgignore)
Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
|
503 |
ignore_patterns_hash: dirstate_map.ignore_patterns_hash, |
47283
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changeset
|
504 |
}; |
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changeset
|
505 |
out[..header_len].copy_from_slice(header.as_bytes()); |
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changeset
|
506 |
Ok(out) |
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changeset
|
507 |
} |
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changeset
|
508 |
|
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
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changeset
|
509 |
fn write_nodes( |
47336
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changeset
|
510 |
dirstate_map: &DirstateMap, |
47333
69530e5d4fe5
dirstate-tree: Add `NodeRef` and `ChildNodesRef` enums
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diff
changeset
|
511 |
nodes: dirstate_map::ChildNodesRef, |
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changeset
|
512 |
out: &mut Vec<u8>, |
2a9ddc8094c7
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changeset
|
513 |
) -> Result<ChildNodes, DirstateError> { |
2a9ddc8094c7
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changeset
|
514 |
// `dirstate_map::ChildNodes` is a `HashMap` with undefined iteration |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
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parents:
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changeset
|
515 |
// order. Sort to enable binary search in the written file. |
47333
69530e5d4fe5
dirstate-tree: Add `NodeRef` and `ChildNodesRef` enums
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
516 |
let nodes = nodes.sorted(); |
47283
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parents:
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diff
changeset
|
517 |
|
2a9ddc8094c7
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Simon Sapin <simon.sapin@octobus.net>
parents:
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changeset
|
518 |
// First accumulate serialized nodes in a `Vec` |
2a9ddc8094c7
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changeset
|
519 |
let mut on_disk_nodes = Vec::with_capacity(nodes.len()); |
47333
69530e5d4fe5
dirstate-tree: Add `NodeRef` and `ChildNodesRef` enums
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
520 |
for node in nodes { |
47337
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
521 |
let children = write_nodes( |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
522 |
dirstate_map, |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
523 |
node.children(dirstate_map.on_disk)?, |
0654b3b3d2b5
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Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
524 |
out, |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
525 |
)?; |
47336
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dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
526 |
let full_path = node.full_path(dirstate_map.on_disk)?; |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
527 |
let full_path = write_slice::<u8>(full_path.as_bytes(), out); |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
528 |
let copy_source = |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
529 |
if let Some(source) = node.copy_source(dirstate_map.on_disk)? { |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
530 |
write_slice::<u8>(source.as_bytes(), out) |
8d0260d0dbc9
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Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
531 |
} else { |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
532 |
Slice { |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
533 |
start: 0.into(), |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
534 |
len: 0.into(), |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
47335
diff
changeset
|
535 |
} |
8d0260d0dbc9
dirstate-v2: Make the dirstate bytes buffer available in more places
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
536 |
}; |
47333
69530e5d4fe5
dirstate-tree: Add `NodeRef` and `ChildNodesRef` enums
Simon Sapin <simon.sapin@octobus.net>
parents:
47331
diff
changeset
|
537 |
on_disk_nodes.push(match node { |
47348
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
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diff
changeset
|
538 |
NodeRef::InMemory(path, node) => { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
539 |
let (state, data) = match &node.data { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
540 |
dirstate_map::NodeData::Entry(entry) => ( |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
541 |
entry.state.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
542 |
Entry { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
543 |
mode: entry.mode.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
544 |
mtime: entry.mtime.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
545 |
size: entry.size.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
546 |
}, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
547 |
), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
548 |
dirstate_map::NodeData::CachedDirectory { mtime } => { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
549 |
(b'd', Entry::from_timestamp(*mtime)) |
47333
69530e5d4fe5
dirstate-tree: Add `NodeRef` and `ChildNodesRef` enums
Simon Sapin <simon.sapin@octobus.net>
parents:
47331
diff
changeset
|
550 |
} |
47348
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
551 |
dirstate_map::NodeData::None => ( |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
552 |
b'\0', |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
553 |
Entry { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
554 |
mode: 0.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
555 |
mtime: 0.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
556 |
size: 0.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
557 |
}, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
558 |
), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
559 |
}; |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
560 |
Node { |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
561 |
children, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
562 |
copy_source, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
563 |
full_path, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
564 |
base_name_start: u32::try_from(path.base_name_start()) |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
565 |
// Could only panic for paths over 4 GiB |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
566 |
.expect("dirstate-v2 offset overflow") |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
567 |
.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
568 |
tracked_descendants_count: node |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
569 |
.tracked_descendants_count |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
570 |
.into(), |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
571 |
state, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
572 |
data, |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
573 |
} |
a4de570e61fa
dirstate-v2: Allow tree nodes without an entry to store a timestamp
Simon Sapin <simon.sapin@octobus.net>
parents:
47337
diff
changeset
|
574 |
} |
47337
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
575 |
NodeRef::OnDisk(node) => Node { |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
576 |
children, |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
577 |
copy_source, |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
578 |
full_path, |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
579 |
..*node |
0654b3b3d2b5
dirstate-v2: Parse the dirstate lazily, with copy-on-write nodes
Simon Sapin <simon.sapin@octobus.net>
parents:
47336
diff
changeset
|
580 |
}, |
47283
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
581 |
}) |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
582 |
} |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
583 |
// … so we can write them contiguously |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
584 |
Ok(write_slice::<Node>(&on_disk_nodes, out)) |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
585 |
} |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
586 |
|
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
587 |
fn write_slice<T>(slice: &[T], out: &mut Vec<u8>) -> Slice |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
588 |
where |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
589 |
T: BytesCast, |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
590 |
{ |
47476
f23eafb036af
dirstate-v2: Use 32-bit integers instead of 64-bit for offsets
Simon Sapin <simon.sapin@octobus.net>
parents:
47475
diff
changeset
|
591 |
let start = u32::try_from(out.len()) |
f23eafb036af
dirstate-v2: Use 32-bit integers instead of 64-bit for offsets
Simon Sapin <simon.sapin@octobus.net>
parents:
47475
diff
changeset
|
592 |
// Could only panic for a dirstate file larger than 4 GiB |
47283
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
593 |
.expect("dirstate-v2 offset overflow") |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
594 |
.into(); |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
595 |
let len = u32::try_from(slice.len()) |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
596 |
// Could only panic for paths over 4 GiB or nodes with over 4 billions |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
597 |
// child nodes |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
598 |
.expect("dirstate-v2 offset overflow") |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
599 |
.into(); |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
600 |
out.extend(slice.as_bytes()); |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
601 |
Slice { start, len } |
2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Simon Sapin <simon.sapin@octobus.net>
parents:
47280
diff
changeset
|
602 |
} |