author | Simon Sapin <simon.sapin@octobus.net> |
Wed, 31 Mar 2021 18:59:49 +0200 | |
changeset 47097 | e66ea29e2b1a |
parent 46890 | 441024b279a6 |
child 47101 | 5d62243c7732 |
permissions | -rw-r--r-- |
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// Copyright 2019 Raphaël Gomès <rgomes@octobus.net> |
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// |
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// This software may be used and distributed according to the terms of the |
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// GNU General Public License version 2 or any later version. |
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use crate::errors::HgError; |
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use crate::utils::hg_path::HgPath; |
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use crate::{ |
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dirstate::{CopyMap, EntryState, RawEntry, StateMap}, |
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DirstateEntry, DirstateParents, |
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}; |
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use byteorder::{BigEndian, WriteBytesExt}; |
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use bytes_cast::BytesCast; |
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use micro_timer::timed; |
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use std::convert::{TryFrom, TryInto}; |
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use std::time::Duration; |
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|
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/// Parents are stored in the dirstate as byte hashes. |
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pub const PARENT_SIZE: usize = 20; |
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/// Dirstate entries have a static part of 8 + 32 + 32 + 32 + 32 bits. |
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const MIN_ENTRY_SIZE: usize = 17; |
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type ParseResult<'a> = ( |
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&'a DirstateParents, |
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Vec<(&'a HgPath, DirstateEntry)>, |
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Vec<(&'a HgPath, &'a HgPath)>, |
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); |
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pub fn parse_dirstate_parents( |
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contents: &[u8], |
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) -> Result<&DirstateParents, HgError> { |
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let (parents, _rest) = DirstateParents::from_bytes(contents) |
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.map_err(|_| HgError::corrupted("Too little data for dirstate."))?; |
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Ok(parents) |
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} |
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#[timed] |
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pub fn parse_dirstate(contents: &[u8]) -> Result<ParseResult, HgError> { |
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let mut copies = Vec::new(); |
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let mut entries = Vec::new(); |
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let parents = |
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parse_dirstate_entries(contents, |path, entry, copy_source| { |
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if let Some(source) = copy_source { |
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copies.push((path, source)); |
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} |
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entries.push((path, *entry)); |
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})?; |
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Ok((parents, entries, copies)) |
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} |
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pub fn parse_dirstate_entries<'a>( |
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mut contents: &'a [u8], |
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mut each_entry: impl FnMut(&'a HgPath, &DirstateEntry, Option<&'a HgPath>), |
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) -> Result<&'a DirstateParents, HgError> { |
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let (parents, rest) = DirstateParents::from_bytes(contents) |
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.map_err(|_| HgError::corrupted("Too little data for dirstate."))?; |
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contents = rest; |
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while !contents.is_empty() { |
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let (raw_entry, rest) = RawEntry::from_bytes(contents) |
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.map_err(|_| HgError::corrupted("Overflow in dirstate."))?; |
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|
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let entry = DirstateEntry { |
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state: EntryState::try_from(raw_entry.state)?, |
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mode: raw_entry.mode.get(), |
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mtime: raw_entry.mtime.get(), |
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size: raw_entry.size.get(), |
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}; |
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let (paths, rest) = |
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u8::slice_from_bytes(rest, raw_entry.length.get() as usize) |
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.map_err(|_| HgError::corrupted("Overflow in dirstate."))?; |
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|
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// `paths` is either a single path, or two paths separated by a NULL |
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// byte |
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let mut iter = paths.splitn(2, |&byte| byte == b'\0'); |
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let path = HgPath::new( |
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iter.next().expect("splitn always yields at least one item"), |
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); |
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let copy_source = iter.next().map(HgPath::new); |
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each_entry(path, &entry, copy_source); |
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|
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contents = rest; |
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} |
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Ok(parents) |
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} |
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/// `now` is the duration in seconds since the Unix epoch |
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pub fn pack_dirstate( |
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state_map: &mut StateMap, |
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copy_map: &CopyMap, |
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parents: DirstateParents, |
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now: Duration, |
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) -> Result<Vec<u8>, HgError> { |
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// TODO move away from i32 before 2038. |
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let now: i32 = now.as_secs().try_into().expect("time overflow"); |
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95 |
|
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96 |
let expected_size: usize = state_map |
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97 |
.iter() |
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98 |
.map(|(filename, _)| { |
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99 |
let mut length = MIN_ENTRY_SIZE + filename.len(); |
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100 |
if let Some(copy) = copy_map.get(filename) { |
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101 |
length += copy.len() + 1; |
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102 |
} |
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103 |
length |
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104 |
}) |
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105 |
.sum(); |
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106 |
let expected_size = expected_size + PARENT_SIZE * 2; |
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107 |
|
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108 |
let mut packed = Vec::with_capacity(expected_size); |
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109 |
|
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110 |
packed.extend(parents.p1.as_bytes()); |
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111 |
packed.extend(parents.p2.as_bytes()); |
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112 |
|
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113 |
for (filename, entry) in state_map.iter_mut() { |
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114 |
let new_filename = filename.to_owned(); |
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115 |
let mut new_mtime: i32 = entry.mtime; |
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if entry.state == EntryState::Normal && entry.mtime == now { |
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117 |
// The file was last modified "simultaneously" with the current |
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118 |
// write to dirstate (i.e. within the same second for file- |
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119 |
// systems with a granularity of 1 sec). This commonly happens |
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120 |
// for at least a couple of files on 'update'. |
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121 |
// The user could change the file without changing its size |
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122 |
// within the same second. Invalidate the file's mtime in |
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123 |
// dirstate, forcing future 'status' calls to compare the |
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124 |
// contents of the file if the size is the same. This prevents |
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125 |
// mistakenly treating such files as clean. |
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126 |
new_mtime = -1; |
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127 |
*entry = DirstateEntry { |
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128 |
mtime: new_mtime, |
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129 |
..*entry |
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130 |
}; |
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131 |
} |
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132 |
let mut new_filename = new_filename.into_vec(); |
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133 |
if let Some(copy) = copy_map.get(filename) { |
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134 |
new_filename.push(b'\0'); |
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135 |
new_filename.extend(copy.bytes()); |
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136 |
} |
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137 |
|
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138 |
// Unwrapping because `impl std::io::Write for Vec<u8>` never errors |
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139 |
packed.write_u8(entry.state.into()).unwrap(); |
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140 |
packed.write_i32::<BigEndian>(entry.mode).unwrap(); |
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141 |
packed.write_i32::<BigEndian>(entry.size).unwrap(); |
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142 |
packed.write_i32::<BigEndian>(new_mtime).unwrap(); |
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143 |
packed |
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144 |
.write_i32::<BigEndian>(new_filename.len() as i32) |
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145 |
.unwrap(); |
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146 |
packed.extend(new_filename) |
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147 |
} |
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148 |
|
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149 |
if packed.len() != expected_size { |
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150 |
return Err(HgError::CorruptedRepository(format!( |
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151 |
"bad dirstate size: {} != {}", |
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152 |
expected_size, |
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153 |
packed.len() |
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154 |
))); |
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155 |
} |
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156 |
|
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157 |
Ok(packed) |
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158 |
} |
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159 |
|
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160 |
#[cfg(test)] |
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161 |
mod tests { |
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162 |
use super::*; |
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163 |
use crate::{utils::hg_path::HgPathBuf, FastHashMap}; |
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164 |
use pretty_assertions::assert_eq; |
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165 |
|
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166 |
#[test] |
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167 |
fn test_pack_dirstate_empty() { |
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168 |
let mut state_map = StateMap::default(); |
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169 |
let copymap = FastHashMap::default(); |
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170 |
let parents = DirstateParents { |
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171 |
p1: b"12345678910111213141".into(), |
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172 |
p2: b"00000000000000000000".into(), |
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173 |
}; |
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174 |
let now = Duration::new(15000000, 0); |
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175 |
let expected = b"1234567891011121314100000000000000000000".to_vec(); |
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176 |
|
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177 |
assert_eq!( |
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178 |
expected, |
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179 |
pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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180 |
); |
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181 |
|
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182 |
assert!(state_map.is_empty()) |
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183 |
} |
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184 |
#[test] |
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185 |
fn test_pack_dirstate_one_entry() { |
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186 |
let expected_state_map: StateMap = [( |
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187 |
HgPathBuf::from_bytes(b"f1"), |
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188 |
DirstateEntry { |
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189 |
state: EntryState::Normal, |
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mode: 0o644, |
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size: 0, |
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mtime: 791231220, |
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193 |
}, |
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194 |
)] |
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.iter() |
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.cloned() |
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.collect(); |
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let mut state_map = expected_state_map.clone(); |
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|
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let copymap = FastHashMap::default(); |
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let parents = DirstateParents { |
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p1: b"12345678910111213141".into(), |
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p2: b"00000000000000000000".into(), |
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}; |
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let now = Duration::new(15000000, 0); |
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let expected = [ |
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49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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41, 58, 244, 0, 0, 0, 2, 102, 49, |
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211 |
] |
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212 |
.to_vec(); |
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|
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assert_eq!( |
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expected, |
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pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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217 |
); |
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|
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assert_eq!(expected_state_map, state_map); |
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220 |
} |
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221 |
#[test] |
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fn test_pack_dirstate_one_entry_with_copy() { |
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let expected_state_map: StateMap = [( |
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HgPathBuf::from_bytes(b"f1"), |
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DirstateEntry { |
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state: EntryState::Normal, |
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mode: 0o644, |
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228 |
size: 0, |
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mtime: 791231220, |
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230 |
}, |
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231 |
)] |
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232 |
.iter() |
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233 |
.cloned() |
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.collect(); |
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let mut state_map = expected_state_map.clone(); |
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let mut copymap = FastHashMap::default(); |
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copymap.insert( |
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HgPathBuf::from_bytes(b"f1"), |
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HgPathBuf::from_bytes(b"copyname"), |
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240 |
); |
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let parents = DirstateParents { |
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p1: b"12345678910111213141".into(), |
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p2: b"00000000000000000000".into(), |
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244 |
}; |
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245 |
let now = Duration::new(15000000, 0); |
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246 |
let expected = [ |
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247 |
49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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248 |
51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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249 |
48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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250 |
41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, 112, 121, 110, 97, |
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251 |
109, 101, |
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252 |
] |
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253 |
.to_vec(); |
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254 |
|
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255 |
assert_eq!( |
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256 |
expected, |
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257 |
pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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258 |
); |
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259 |
assert_eq!(expected_state_map, state_map); |
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260 |
} |
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261 |
|
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262 |
#[test] |
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263 |
fn test_parse_pack_one_entry_with_copy() { |
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let mut state_map: StateMap = [( |
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HgPathBuf::from_bytes(b"f1"), |
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266 |
DirstateEntry { |
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state: EntryState::Normal, |
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268 |
mode: 0o644, |
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269 |
size: 0, |
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270 |
mtime: 791231220, |
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271 |
}, |
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272 |
)] |
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273 |
.iter() |
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274 |
.cloned() |
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275 |
.collect(); |
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let mut copymap = FastHashMap::default(); |
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copymap.insert( |
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278 |
HgPathBuf::from_bytes(b"f1"), |
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279 |
HgPathBuf::from_bytes(b"copyname"), |
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280 |
); |
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281 |
let parents = DirstateParents { |
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p1: b"12345678910111213141".into(), |
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283 |
p2: b"00000000000000000000".into(), |
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}; |
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285 |
let now = Duration::new(15000000, 0); |
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let result = |
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pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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.unwrap(); |
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289 |
|
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let (new_parents, entries, copies) = |
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291 |
parse_dirstate(result.as_slice()).unwrap(); |
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let new_state_map: StateMap = entries |
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293 |
.into_iter() |
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.map(|(path, entry)| (path.to_owned(), entry)) |
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.collect(); |
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296 |
let new_copy_map: CopyMap = copies |
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.into_iter() |
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298 |
.map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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299 |
.collect(); |
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300 |
|
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301 |
assert_eq!( |
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(&parents, state_map, copymap), |
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(new_parents, new_state_map, new_copy_map) |
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304 |
) |
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305 |
} |
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306 |
|
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307 |
#[test] |
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fn test_parse_pack_multiple_entries_with_copy() { |
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309 |
let mut state_map: StateMap = [ |
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310 |
( |
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HgPathBuf::from_bytes(b"f1"), |
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DirstateEntry { |
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state: EntryState::Normal, |
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314 |
mode: 0o644, |
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315 |
size: 0, |
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316 |
mtime: 791231220, |
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317 |
}, |
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318 |
), |
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319 |
( |
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320 |
HgPathBuf::from_bytes(b"f2"), |
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|
321 |
DirstateEntry { |
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322 |
state: EntryState::Merged, |
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323 |
mode: 0o777, |
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324 |
size: 1000, |
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325 |
mtime: 791231220, |
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326 |
}, |
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327 |
), |
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328 |
( |
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329 |
HgPathBuf::from_bytes(b"f3"), |
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330 |
DirstateEntry { |
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331 |
state: EntryState::Removed, |
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332 |
mode: 0o644, |
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333 |
size: 234553, |
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334 |
mtime: 791231220, |
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335 |
}, |
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336 |
), |
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337 |
( |
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338 |
HgPathBuf::from_bytes(b"f4\xF6"), |
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339 |
DirstateEntry { |
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state: EntryState::Added, |
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341 |
mode: 0o644, |
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342 |
size: -1, |
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343 |
mtime: -1, |
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344 |
}, |
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345 |
), |
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346 |
] |
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347 |
.iter() |
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348 |
.cloned() |
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349 |
.collect(); |
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350 |
let mut copymap = FastHashMap::default(); |
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351 |
copymap.insert( |
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352 |
HgPathBuf::from_bytes(b"f1"), |
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353 |
HgPathBuf::from_bytes(b"copyname"), |
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|
354 |
); |
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355 |
copymap.insert( |
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356 |
HgPathBuf::from_bytes(b"f4\xF6"), |
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HgPathBuf::from_bytes(b"copyname2"), |
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358 |
); |
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359 |
let parents = DirstateParents { |
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360 |
p1: b"12345678910111213141".into(), |
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361 |
p2: b"00000000000000000000".into(), |
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362 |
}; |
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363 |
let now = Duration::new(15000000, 0); |
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364 |
let result = |
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365 |
pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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366 |
.unwrap(); |
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367 |
|
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368 |
let (new_parents, entries, copies) = |
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369 |
parse_dirstate(result.as_slice()).unwrap(); |
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370 |
let new_state_map: StateMap = entries |
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371 |
.into_iter() |
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372 |
.map(|(path, entry)| (path.to_owned(), entry)) |
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373 |
.collect(); |
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374 |
let new_copy_map: CopyMap = copies |
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375 |
.into_iter() |
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376 |
.map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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377 |
.collect(); |
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|
378 |
|
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379 |
assert_eq!( |
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(&parents, state_map, copymap), |
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(new_parents, new_state_map, new_copy_map) |
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382 |
) |
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383 |
} |
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384 |
|
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385 |
#[test] |
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/// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4 |
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fn test_parse_pack_one_entry_with_copy_and_time_conflict() { |
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388 |
let mut state_map: StateMap = [( |
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rust-hgpath: replace all paths and filenames with HgPath/HgPathBuf
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389 |
HgPathBuf::from_bytes(b"f1"), |
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390 |
DirstateEntry { |
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state: EntryState::Normal, |
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392 |
mode: 0o644, |
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393 |
size: 0, |
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394 |
mtime: 15000000, |
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395 |
}, |
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396 |
)] |
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397 |
.iter() |
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398 |
.cloned() |
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399 |
.collect(); |
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rust-performance: introduce FastHashMap type alias for HashMap
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let mut copymap = FastHashMap::default(); |
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401 |
copymap.insert( |
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HgPathBuf::from_bytes(b"f1"), |
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403 |
HgPathBuf::from_bytes(b"copyname"), |
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404 |
); |
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405 |
let parents = DirstateParents { |
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rust: Make `DirstateParents`’s fields typed `Node`s
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p1: b"12345678910111213141".into(), |
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p2: b"00000000000000000000".into(), |
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408 |
}; |
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409 |
let now = Duration::new(15000000, 0); |
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410 |
let result = |
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411 |
pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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412 |
.unwrap(); |
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413 |
|
45357
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hg-core: make parse_dirstate return references rather than update hashmaps
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414 |
let (new_parents, entries, copies) = |
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415 |
parse_dirstate(result.as_slice()).unwrap(); |
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416 |
let new_state_map: StateMap = entries |
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417 |
.into_iter() |
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418 |
.map(|(path, entry)| (path.to_owned(), entry)) |
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419 |
.collect(); |
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420 |
let new_copy_map: CopyMap = copies |
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421 |
.into_iter() |
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422 |
.map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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423 |
.collect(); |
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424 |
|
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425 |
assert_eq!( |
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426 |
( |
46594
f88e8ae0aa8f
rust: Rewrite dirstate parsing usin the `bytes-cast` crate
Simon Sapin <simon.sapin@octobus.net>
parents:
46440
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|
427 |
&parents, |
42748
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rust-parsers: switch to parse/pack_dirstate to mutate-on-loop
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428 |
[( |
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rust-hgpath: replace all paths and filenames with HgPath/HgPathBuf
Raphaël Gomès <rgomes@octobus.net>
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429 |
HgPathBuf::from_bytes(b"f1"), |
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rust-dirstate: add rust implementation of `parse_dirstate` and `pack_dirstate`
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430 |
DirstateEntry { |
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rust-dirstate: use EntryState enum instead of literals
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431 |
state: EntryState::Normal, |
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432 |
mode: 0o644, |
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433 |
size: 0, |
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434 |
mtime: -1 |
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435 |
} |
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|
436 |
)] |
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437 |
.iter() |
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438 |
.cloned() |
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439 |
.collect::<StateMap>(), |
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440 |
copymap, |
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441 |
), |
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rust-parsers: switch to parse/pack_dirstate to mutate-on-loop
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parents:
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442 |
(new_parents, new_state_map, new_copy_map) |
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rust-dirstate: add rust implementation of `parse_dirstate` and `pack_dirstate`
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|
443 |
) |
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444 |
} |
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445 |
} |