Mercurial > hg
annotate rust/hg-core/src/dirstate/parsers.rs @ 47102:d6c94ca40863
dirstate-tree: Serialize to disk
The existing `pack_dirstate` function relies on implementation details
of `DirstateMap`, so extract some parts of it as separate functions
for us in the tree-based `DirstateMap`.
The `bytes-cast` crate is updated to a version that has an `as_bytes` method,
not just `from_bytes`:
https://docs.rs/bytes-cast/0.2.0/bytes_cast/trait.BytesCast.html#method.as_bytes
Drive-by refactor `clear_ambiguous_times` which does part of the same thing.
Differential Revision: https://phab.mercurial-scm.org/D10486
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 12 Apr 2021 14:21:47 +0200 |
parents | 5d62243c7732 |
children | cd8ca38fccff |
rev | line source |
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1 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net> |
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2 // |
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3 // This software may be used and distributed according to the terms of the |
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4 // GNU General Public License version 2 or any later version. |
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5 |
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6 use crate::errors::HgError; |
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7 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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8 use crate::{ |
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9 dirstate::{CopyMap, EntryState, RawEntry, StateMap}, |
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10 DirstateEntry, DirstateParents, |
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11 }; |
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12 use byteorder::{BigEndian, WriteBytesExt}; |
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13 use bytes_cast::BytesCast; |
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14 use micro_timer::timed; |
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15 use std::convert::{TryFrom, TryInto}; |
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16 |
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17 /// Parents are stored in the dirstate as byte hashes. |
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18 pub const PARENT_SIZE: usize = 20; |
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19 /// Dirstate entries have a static part of 8 + 32 + 32 + 32 + 32 bits. |
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20 const MIN_ENTRY_SIZE: usize = 17; |
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21 |
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22 type ParseResult<'a> = ( |
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23 &'a DirstateParents, |
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24 Vec<(&'a HgPath, DirstateEntry)>, |
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25 Vec<(&'a HgPath, &'a HgPath)>, |
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26 ); |
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27 |
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28 pub fn parse_dirstate_parents( |
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29 contents: &[u8], |
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30 ) -> Result<&DirstateParents, HgError> { |
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31 let (parents, _rest) = DirstateParents::from_bytes(contents) |
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32 .map_err(|_| HgError::corrupted("Too little data for dirstate."))?; |
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33 Ok(parents) |
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34 } |
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35 |
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36 #[timed] |
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37 pub fn parse_dirstate(contents: &[u8]) -> Result<ParseResult, HgError> { |
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38 let mut copies = Vec::new(); |
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39 let mut entries = Vec::new(); |
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40 let parents = |
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41 parse_dirstate_entries(contents, |path, entry, copy_source| { |
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42 if let Some(source) = copy_source { |
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43 copies.push((path, source)); |
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44 } |
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45 entries.push((path, *entry)); |
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46 })?; |
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47 Ok((parents, entries, copies)) |
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48 } |
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49 |
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50 pub fn parse_dirstate_entries<'a>( |
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51 mut contents: &'a [u8], |
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52 mut each_entry: impl FnMut(&'a HgPath, &DirstateEntry, Option<&'a HgPath>), |
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53 ) -> Result<&'a DirstateParents, HgError> { |
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54 let (parents, rest) = DirstateParents::from_bytes(contents) |
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55 .map_err(|_| HgError::corrupted("Too little data for dirstate."))?; |
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56 contents = rest; |
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57 while !contents.is_empty() { |
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58 let (raw_entry, rest) = RawEntry::from_bytes(contents) |
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59 .map_err(|_| HgError::corrupted("Overflow in dirstate."))?; |
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60 |
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61 let entry = DirstateEntry { |
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62 state: EntryState::try_from(raw_entry.state)?, |
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63 mode: raw_entry.mode.get(), |
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64 mtime: raw_entry.mtime.get(), |
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65 size: raw_entry.size.get(), |
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66 }; |
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67 let (paths, rest) = |
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68 u8::slice_from_bytes(rest, raw_entry.length.get() as usize) |
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69 .map_err(|_| HgError::corrupted("Overflow in dirstate."))?; |
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70 |
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71 // `paths` is either a single path, or two paths separated by a NULL |
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72 // byte |
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73 let mut iter = paths.splitn(2, |&byte| byte == b'\0'); |
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74 let path = HgPath::new( |
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75 iter.next().expect("splitn always yields at least one item"), |
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76 ); |
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77 let copy_source = iter.next().map(HgPath::new); |
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78 each_entry(path, &entry, copy_source); |
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79 |
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80 contents = rest; |
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81 } |
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82 Ok(parents) |
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83 } |
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84 |
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85 fn packed_filename_and_copy_source_size( |
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86 filename: &HgPathBuf, |
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87 copy_source: Option<&HgPathBuf>, |
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88 ) -> usize { |
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89 filename.len() |
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90 + if let Some(source) = copy_source { |
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91 b"\0".len() + source.len() |
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92 } else { |
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93 0 |
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94 } |
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95 } |
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96 |
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97 pub fn packed_entry_size( |
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98 filename: &HgPathBuf, |
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99 copy_source: Option<&HgPathBuf>, |
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100 ) -> usize { |
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101 MIN_ENTRY_SIZE |
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102 + packed_filename_and_copy_source_size(filename, copy_source) |
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103 } |
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104 |
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105 pub fn pack_entry( |
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106 filename: &HgPathBuf, |
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107 entry: &DirstateEntry, |
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108 copy_source: Option<&HgPathBuf>, |
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109 packed: &mut Vec<u8>, |
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110 ) { |
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111 let length = packed_filename_and_copy_source_size(filename, copy_source); |
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112 |
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113 // Unwrapping because `impl std::io::Write for Vec<u8>` never errors |
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114 packed.write_u8(entry.state.into()).unwrap(); |
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115 packed.write_i32::<BigEndian>(entry.mode).unwrap(); |
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116 packed.write_i32::<BigEndian>(entry.size).unwrap(); |
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117 packed.write_i32::<BigEndian>(entry.mtime).unwrap(); |
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118 packed.write_i32::<BigEndian>(length as i32).unwrap(); |
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119 packed.extend(filename.as_bytes()); |
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120 if let Some(source) = copy_source { |
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121 packed.push(b'\0'); |
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122 packed.extend(source.as_bytes()); |
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123 } |
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124 } |
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125 |
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126 /// Seconds since the Unix epoch |
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127 pub struct Timestamp(pub u64); |
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128 |
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129 pub fn clear_ambiguous_mtime( |
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130 entry: &mut DirstateEntry, |
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131 mtime_now: i32, |
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132 ) -> bool { |
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133 let ambiguous = |
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134 entry.state == EntryState::Normal && entry.mtime == mtime_now; |
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135 if ambiguous { |
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136 // The file was last modified "simultaneously" with the current |
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137 // write to dirstate (i.e. within the same second for file- |
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138 // systems with a granularity of 1 sec). This commonly happens |
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139 // for at least a couple of files on 'update'. |
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140 // The user could change the file without changing its size |
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141 // within the same second. Invalidate the file's mtime in |
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142 // dirstate, forcing future 'status' calls to compare the |
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143 // contents of the file if the size is the same. This prevents |
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144 // mistakenly treating such files as clean. |
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145 entry.mtime = -1; |
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146 } |
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147 ambiguous |
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148 } |
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149 |
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150 pub fn pack_dirstate( |
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151 state_map: &mut StateMap, |
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152 copy_map: &CopyMap, |
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153 parents: DirstateParents, |
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154 now: Timestamp, |
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155 ) -> Result<Vec<u8>, HgError> { |
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156 // TODO move away from i32 before 2038. |
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157 let now: i32 = now.0.try_into().expect("time overflow"); |
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158 |
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159 let expected_size: usize = state_map |
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160 .iter() |
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161 .map(|(filename, _)| { |
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162 packed_entry_size(filename, copy_map.get(filename)) |
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163 }) |
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164 .sum(); |
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165 let expected_size = expected_size + PARENT_SIZE * 2; |
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166 |
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167 let mut packed = Vec::with_capacity(expected_size); |
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168 |
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169 packed.extend(parents.p1.as_bytes()); |
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170 packed.extend(parents.p2.as_bytes()); |
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171 |
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172 for (filename, entry) in state_map.iter_mut() { |
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173 clear_ambiguous_mtime(entry, now); |
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174 pack_entry(filename, entry, copy_map.get(filename), &mut packed) |
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175 } |
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176 |
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177 if packed.len() != expected_size { |
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178 return Err(HgError::CorruptedRepository(format!( |
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179 "bad dirstate size: {} != {}", |
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180 expected_size, |
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181 packed.len() |
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182 ))); |
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183 } |
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184 |
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185 Ok(packed) |
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186 } |
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187 |
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188 #[cfg(test)] |
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189 mod tests { |
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190 use super::*; |
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191 use crate::{utils::hg_path::HgPathBuf, FastHashMap}; |
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192 use pretty_assertions::assert_eq; |
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193 |
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194 #[test] |
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195 fn test_pack_dirstate_empty() { |
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196 let mut state_map = StateMap::default(); |
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197 let copymap = FastHashMap::default(); |
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198 let parents = DirstateParents { |
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199 p1: b"12345678910111213141".into(), |
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200 p2: b"00000000000000000000".into(), |
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201 }; |
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202 let now = Timestamp(15000000); |
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203 let expected = b"1234567891011121314100000000000000000000".to_vec(); |
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204 |
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205 assert_eq!( |
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206 expected, |
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207 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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208 ); |
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209 |
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210 assert!(state_map.is_empty()) |
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211 } |
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212 #[test] |
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213 fn test_pack_dirstate_one_entry() { |
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214 let expected_state_map: StateMap = [( |
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215 HgPathBuf::from_bytes(b"f1"), |
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216 DirstateEntry { |
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217 state: EntryState::Normal, |
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218 mode: 0o644, |
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219 size: 0, |
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220 mtime: 791231220, |
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221 }, |
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222 )] |
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223 .iter() |
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224 .cloned() |
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225 .collect(); |
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226 let mut state_map = expected_state_map.clone(); |
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227 |
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228 let copymap = FastHashMap::default(); |
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229 let parents = DirstateParents { |
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230 p1: b"12345678910111213141".into(), |
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231 p2: b"00000000000000000000".into(), |
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232 }; |
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233 let now = Timestamp(15000000); |
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234 let expected = [ |
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235 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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236 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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237 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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238 41, 58, 244, 0, 0, 0, 2, 102, 49, |
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239 ] |
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240 .to_vec(); |
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241 |
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242 assert_eq!( |
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243 expected, |
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244 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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245 ); |
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246 |
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247 assert_eq!(expected_state_map, state_map); |
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248 } |
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249 #[test] |
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250 fn test_pack_dirstate_one_entry_with_copy() { |
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251 let expected_state_map: StateMap = [( |
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252 HgPathBuf::from_bytes(b"f1"), |
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253 DirstateEntry { |
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254 state: EntryState::Normal, |
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255 mode: 0o644, |
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256 size: 0, |
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257 mtime: 791231220, |
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258 }, |
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259 )] |
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260 .iter() |
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261 .cloned() |
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262 .collect(); |
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263 let mut state_map = expected_state_map.clone(); |
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264 let mut copymap = FastHashMap::default(); |
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265 copymap.insert( |
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266 HgPathBuf::from_bytes(b"f1"), |
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267 HgPathBuf::from_bytes(b"copyname"), |
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268 ); |
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269 let parents = DirstateParents { |
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270 p1: b"12345678910111213141".into(), |
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271 p2: b"00000000000000000000".into(), |
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272 }; |
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273 let now = Timestamp(15000000); |
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274 let expected = [ |
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275 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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276 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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277 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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278 41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, 112, 121, 110, 97, |
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279 109, 101, |
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280 ] |
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281 .to_vec(); |
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282 |
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283 assert_eq!( |
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284 expected, |
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285 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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286 ); |
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287 assert_eq!(expected_state_map, state_map); |
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288 } |
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289 |
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290 #[test] |
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291 fn test_parse_pack_one_entry_with_copy() { |
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292 let mut state_map: StateMap = [( |
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293 HgPathBuf::from_bytes(b"f1"), |
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294 DirstateEntry { |
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295 state: EntryState::Normal, |
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296 mode: 0o644, |
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297 size: 0, |
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298 mtime: 791231220, |
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299 }, |
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300 )] |
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301 .iter() |
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302 .cloned() |
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303 .collect(); |
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304 let mut copymap = FastHashMap::default(); |
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305 copymap.insert( |
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306 HgPathBuf::from_bytes(b"f1"), |
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307 HgPathBuf::from_bytes(b"copyname"), |
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308 ); |
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309 let parents = DirstateParents { |
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310 p1: b"12345678910111213141".into(), |
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311 p2: b"00000000000000000000".into(), |
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312 }; |
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313 let now = Timestamp(15000000); |
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314 let result = |
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315 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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316 .unwrap(); |
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317 |
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318 let (new_parents, entries, copies) = |
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319 parse_dirstate(result.as_slice()).unwrap(); |
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320 let new_state_map: StateMap = entries |
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321 .into_iter() |
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322 .map(|(path, entry)| (path.to_owned(), entry)) |
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323 .collect(); |
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324 let new_copy_map: CopyMap = copies |
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325 .into_iter() |
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326 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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327 .collect(); |
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328 |
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329 assert_eq!( |
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330 (&parents, state_map, copymap), |
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331 (new_parents, new_state_map, new_copy_map) |
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332 ) |
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333 } |
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334 |
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335 #[test] |
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336 fn test_parse_pack_multiple_entries_with_copy() { |
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337 let mut state_map: StateMap = [ |
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338 ( |
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339 HgPathBuf::from_bytes(b"f1"), |
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340 DirstateEntry { |
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341 state: EntryState::Normal, |
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342 mode: 0o644, |
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343 size: 0, |
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344 mtime: 791231220, |
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345 }, |
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346 ), |
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347 ( |
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348 HgPathBuf::from_bytes(b"f2"), |
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349 DirstateEntry { |
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350 state: EntryState::Merged, |
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351 mode: 0o777, |
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352 size: 1000, |
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353 mtime: 791231220, |
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354 }, |
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355 ), |
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356 ( |
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357 HgPathBuf::from_bytes(b"f3"), |
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358 DirstateEntry { |
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359 state: EntryState::Removed, |
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360 mode: 0o644, |
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361 size: 234553, |
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362 mtime: 791231220, |
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363 }, |
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364 ), |
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365 ( |
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366 HgPathBuf::from_bytes(b"f4\xF6"), |
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367 DirstateEntry { |
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368 state: EntryState::Added, |
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369 mode: 0o644, |
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370 size: -1, |
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371 mtime: -1, |
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372 }, |
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373 ), |
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374 ] |
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375 .iter() |
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376 .cloned() |
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377 .collect(); |
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378 let mut copymap = FastHashMap::default(); |
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379 copymap.insert( |
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380 HgPathBuf::from_bytes(b"f1"), |
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381 HgPathBuf::from_bytes(b"copyname"), |
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382 ); |
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383 copymap.insert( |
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384 HgPathBuf::from_bytes(b"f4\xF6"), |
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385 HgPathBuf::from_bytes(b"copyname2"), |
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386 ); |
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387 let parents = DirstateParents { |
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388 p1: b"12345678910111213141".into(), |
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389 p2: b"00000000000000000000".into(), |
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390 }; |
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391 let now = Timestamp(15000000); |
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392 let result = |
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393 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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394 .unwrap(); |
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395 |
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396 let (new_parents, entries, copies) = |
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397 parse_dirstate(result.as_slice()).unwrap(); |
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398 let new_state_map: StateMap = entries |
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399 .into_iter() |
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400 .map(|(path, entry)| (path.to_owned(), entry)) |
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401 .collect(); |
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402 let new_copy_map: CopyMap = copies |
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403 .into_iter() |
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404 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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405 .collect(); |
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406 |
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407 assert_eq!( |
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408 (&parents, state_map, copymap), |
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409 (new_parents, new_state_map, new_copy_map) |
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410 ) |
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411 } |
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412 |
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413 #[test] |
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414 /// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4 |
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415 fn test_parse_pack_one_entry_with_copy_and_time_conflict() { |
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416 let mut state_map: StateMap = [( |
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417 HgPathBuf::from_bytes(b"f1"), |
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418 DirstateEntry { |
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419 state: EntryState::Normal, |
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420 mode: 0o644, |
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421 size: 0, |
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422 mtime: 15000000, |
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423 }, |
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424 )] |
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425 .iter() |
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426 .cloned() |
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427 .collect(); |
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428 let mut copymap = FastHashMap::default(); |
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429 copymap.insert( |
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430 HgPathBuf::from_bytes(b"f1"), |
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431 HgPathBuf::from_bytes(b"copyname"), |
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432 ); |
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433 let parents = DirstateParents { |
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434 p1: b"12345678910111213141".into(), |
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435 p2: b"00000000000000000000".into(), |
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436 }; |
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437 let now = Timestamp(15000000); |
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438 let result = |
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439 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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440 .unwrap(); |
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441 |
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442 let (new_parents, entries, copies) = |
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443 parse_dirstate(result.as_slice()).unwrap(); |
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444 let new_state_map: StateMap = entries |
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445 .into_iter() |
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446 .map(|(path, entry)| (path.to_owned(), entry)) |
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447 .collect(); |
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448 let new_copy_map: CopyMap = copies |
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449 .into_iter() |
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450 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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451 .collect(); |
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452 |
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453 assert_eq!( |
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454 ( |
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455 &parents, |
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456 [( |
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457 HgPathBuf::from_bytes(b"f1"), |
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458 DirstateEntry { |
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459 state: EntryState::Normal, |
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460 mode: 0o644, |
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461 size: 0, |
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462 mtime: -1 |
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463 } |
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464 )] |
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465 .iter() |
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466 .cloned() |
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467 .collect::<StateMap>(), |
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468 copymap, |
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469 ), |
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470 (new_parents, new_state_map, new_copy_map) |
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471 ) |
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472 } |
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473 } |