Mercurial > hg
annotate rust/hg-core/src/dirstate/parsers.rs @ 45646:1efbc787334c
rust-parsers: use in-place mutation instead of allocating a new `Vec`
This is not done for the `dirstate-tree` feature, since it lacks `iter_mut`.
Differential Revision: https://phab.mercurial-scm.org/D9136
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 01 Oct 2020 09:48:41 +0200 |
parents | 496537c9c1b4 |
children | 68a15b5a7e58 |
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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::utils::hg_path::HgPath; |
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7 use crate::{ |
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8 dirstate::{CopyMap, EntryState, StateMap}, |
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9 DirstateEntry, DirstatePackError, DirstateParents, DirstateParseError, |
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10 }; |
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11 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt}; |
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12 use micro_timer::timed; |
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13 use std::convert::{TryFrom, TryInto}; |
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14 use std::io::Cursor; |
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15 use std::time::Duration; |
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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 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 #[timed] |
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29 pub fn parse_dirstate( |
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30 contents: &[u8], |
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31 ) -> Result<ParseResult, DirstateParseError> { |
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32 if contents.len() < PARENT_SIZE * 2 { |
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33 return Err(DirstateParseError::TooLittleData); |
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34 } |
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35 let mut copies = vec![]; |
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36 let mut entries = vec![]; |
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37 |
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38 let mut curr_pos = PARENT_SIZE * 2; |
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39 let parents = DirstateParents { |
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40 p1: contents[..PARENT_SIZE].try_into().unwrap(), |
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41 p2: contents[PARENT_SIZE..curr_pos].try_into().unwrap(), |
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42 }; |
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43 |
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44 while curr_pos < contents.len() { |
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45 if curr_pos + MIN_ENTRY_SIZE > contents.len() { |
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46 return Err(DirstateParseError::Overflow); |
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47 } |
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48 let entry_bytes = &contents[curr_pos..]; |
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49 |
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50 let mut cursor = Cursor::new(entry_bytes); |
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51 let state = EntryState::try_from(cursor.read_u8()?)?; |
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52 let mode = cursor.read_i32::<BigEndian>()?; |
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53 let size = cursor.read_i32::<BigEndian>()?; |
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54 let mtime = cursor.read_i32::<BigEndian>()?; |
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55 let path_len = cursor.read_i32::<BigEndian>()? as usize; |
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56 |
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57 if path_len > contents.len() - curr_pos { |
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58 return Err(DirstateParseError::Overflow); |
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59 } |
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60 |
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61 // Slice instead of allocating a Vec needed for `read_exact` |
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62 let path = &entry_bytes[MIN_ENTRY_SIZE..MIN_ENTRY_SIZE + (path_len)]; |
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63 |
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64 let (path, copy) = match memchr::memchr(0, path) { |
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65 None => (path, None), |
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66 Some(i) => (&path[..i], Some(&path[(i + 1)..])), |
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67 }; |
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68 |
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69 if let Some(copy_path) = copy { |
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70 copies.push((HgPath::new(path), HgPath::new(copy_path))); |
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71 }; |
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72 entries.push(( |
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73 HgPath::new(path), |
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74 DirstateEntry { |
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75 state, |
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76 mode, |
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77 size, |
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78 mtime, |
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79 }, |
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80 )); |
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81 curr_pos = curr_pos + MIN_ENTRY_SIZE + (path_len); |
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82 } |
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83 Ok((parents, entries, copies)) |
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84 } |
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85 |
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86 /// `now` is the duration in seconds since the Unix epoch |
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87 #[cfg(not(feature = "dirstate-tree"))] |
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88 pub fn pack_dirstate( |
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89 state_map: &mut StateMap, |
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90 copy_map: &CopyMap, |
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91 parents: DirstateParents, |
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92 now: Duration, |
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93 ) -> Result<Vec<u8>, DirstatePackError> { |
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94 // TODO move away from i32 before 2038. |
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95 let now: i32 = now.as_secs().try_into().expect("time overflow"); |
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96 |
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97 let expected_size: usize = state_map |
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98 .iter() |
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99 .map(|(filename, _)| { |
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100 let mut length = MIN_ENTRY_SIZE + filename.len(); |
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101 if let Some(copy) = copy_map.get(filename) { |
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102 length += copy.len() + 1; |
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103 } |
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104 length |
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105 }) |
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106 .sum(); |
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107 let expected_size = expected_size + PARENT_SIZE * 2; |
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108 |
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109 let mut packed = Vec::with_capacity(expected_size); |
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110 |
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111 packed.extend(&parents.p1); |
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112 packed.extend(&parents.p2); |
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113 |
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114 for (filename, entry) in state_map.iter_mut() { |
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115 let new_filename = filename.to_owned(); |
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116 let mut new_mtime: i32 = entry.mtime; |
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117 if entry.state == EntryState::Normal && entry.mtime == now { |
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118 // The file was last modified "simultaneously" with the current |
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119 // write to dirstate (i.e. within the same second for file- |
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120 // systems with a granularity of 1 sec). This commonly happens |
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121 // for at least a couple of files on 'update'. |
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122 // The user could change the file without changing its size |
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123 // within the same second. Invalidate the file's mtime in |
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124 // dirstate, forcing future 'status' calls to compare the |
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125 // contents of the file if the size is the same. This prevents |
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126 // mistakenly treating such files as clean. |
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127 new_mtime = -1; |
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128 *entry = DirstateEntry { |
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129 mtime: new_mtime, |
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130 ..*entry |
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131 }; |
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132 } |
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133 let mut new_filename = new_filename.into_vec(); |
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134 if let Some(copy) = copy_map.get(filename) { |
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135 new_filename.push(b'\0'); |
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136 new_filename.extend(copy.bytes()); |
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137 } |
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138 |
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139 packed.write_u8(entry.state.into())?; |
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140 packed.write_i32::<BigEndian>(entry.mode)?; |
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141 packed.write_i32::<BigEndian>(entry.size)?; |
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142 packed.write_i32::<BigEndian>(new_mtime)?; |
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143 packed.write_i32::<BigEndian>(new_filename.len() as i32)?; |
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144 packed.extend(new_filename) |
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145 } |
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146 |
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147 if packed.len() != expected_size { |
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148 return Err(DirstatePackError::BadSize(expected_size, packed.len())); |
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149 } |
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150 |
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151 Ok(packed) |
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152 } |
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153 /// `now` is the duration in seconds since the Unix epoch |
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154 #[cfg(feature = "dirstate-tree")] |
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155 pub fn pack_dirstate( |
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156 state_map: &mut StateMap, |
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157 copy_map: &CopyMap, |
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158 parents: DirstateParents, |
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159 now: Duration, |
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160 ) -> Result<Vec<u8>, DirstatePackError> { |
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161 // TODO move away from i32 before 2038. |
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162 let now: i32 = now.as_secs().try_into().expect("time overflow"); |
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163 |
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164 let expected_size: usize = state_map |
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165 .iter() |
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166 .map(|(filename, _)| { |
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167 let mut length = MIN_ENTRY_SIZE + filename.len(); |
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168 if let Some(copy) = copy_map.get(&filename) { |
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169 length += copy.len() + 1; |
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170 } |
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171 length |
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172 }) |
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173 .sum(); |
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174 let expected_size = expected_size + PARENT_SIZE * 2; |
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175 |
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176 let mut packed = Vec::with_capacity(expected_size); |
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177 let mut new_state_map = vec![]; |
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178 |
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179 packed.extend(&parents.p1); |
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180 packed.extend(&parents.p2); |
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181 |
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182 for (filename, entry) in state_map.iter() { |
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183 let new_filename = filename.to_owned(); |
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184 let mut new_mtime: i32 = entry.mtime; |
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185 if entry.state == EntryState::Normal && entry.mtime == now { |
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186 // The file was last modified "simultaneously" with the current |
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187 // write to dirstate (i.e. within the same second for file- |
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188 // systems with a granularity of 1 sec). This commonly happens |
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189 // for at least a couple of files on 'update'. |
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190 // The user could change the file without changing its size |
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191 // within the same second. Invalidate the file's mtime in |
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192 // dirstate, forcing future 'status' calls to compare the |
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193 // contents of the file if the size is the same. This prevents |
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194 // mistakenly treating such files as clean. |
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195 new_mtime = -1; |
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196 new_state_map.push(( |
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197 filename.to_owned(), |
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198 DirstateEntry { |
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199 mtime: new_mtime, |
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200 ..entry |
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201 }, |
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202 )); |
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203 } |
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204 let mut new_filename = new_filename.into_vec(); |
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205 if let Some(copy) = copy_map.get(&filename) { |
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206 new_filename.push(b'\0'); |
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207 new_filename.extend(copy.bytes()); |
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208 } |
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209 |
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210 packed.write_u8(entry.state.into())?; |
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211 packed.write_i32::<BigEndian>(entry.mode)?; |
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212 packed.write_i32::<BigEndian>(entry.size)?; |
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213 packed.write_i32::<BigEndian>(new_mtime)?; |
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214 packed.write_i32::<BigEndian>(new_filename.len() as i32)?; |
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215 packed.extend(new_filename) |
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216 } |
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217 |
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218 if packed.len() != expected_size { |
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219 return Err(DirstatePackError::BadSize(expected_size, packed.len())); |
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220 } |
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221 |
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222 state_map.extend(new_state_map); |
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223 |
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224 Ok(packed) |
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225 } |
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226 |
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227 #[cfg(test)] |
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228 mod tests { |
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229 use super::*; |
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230 use crate::{utils::hg_path::HgPathBuf, FastHashMap}; |
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231 use pretty_assertions::assert_eq; |
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232 |
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233 #[test] |
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234 fn test_pack_dirstate_empty() { |
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235 let mut state_map = StateMap::default(); |
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236 let copymap = FastHashMap::default(); |
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237 let parents = DirstateParents { |
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238 p1: *b"12345678910111213141", |
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239 p2: *b"00000000000000000000", |
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240 }; |
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241 let now = Duration::new(15000000, 0); |
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242 let expected = b"1234567891011121314100000000000000000000".to_vec(); |
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243 |
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244 assert_eq!( |
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245 expected, |
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246 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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247 ); |
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248 |
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249 assert!(state_map.is_empty()) |
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250 } |
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251 #[test] |
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252 fn test_pack_dirstate_one_entry() { |
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253 let expected_state_map: StateMap = [( |
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254 HgPathBuf::from_bytes(b"f1"), |
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255 DirstateEntry { |
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256 state: EntryState::Normal, |
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257 mode: 0o644, |
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258 size: 0, |
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259 mtime: 791231220, |
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260 }, |
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261 )] |
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262 .iter() |
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263 .cloned() |
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264 .collect(); |
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265 let mut state_map = expected_state_map.clone(); |
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266 |
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267 let copymap = FastHashMap::default(); |
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268 let parents = DirstateParents { |
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269 p1: *b"12345678910111213141", |
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270 p2: *b"00000000000000000000", |
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271 }; |
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272 let now = Duration::new(15000000, 0); |
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273 let expected = [ |
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274 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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275 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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276 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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277 41, 58, 244, 0, 0, 0, 2, 102, 49, |
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278 ] |
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279 .to_vec(); |
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280 |
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281 assert_eq!( |
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282 expected, |
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283 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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284 ); |
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285 |
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286 assert_eq!(expected_state_map, state_map); |
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287 } |
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288 #[test] |
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289 fn test_pack_dirstate_one_entry_with_copy() { |
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290 let expected_state_map: StateMap = [( |
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291 HgPathBuf::from_bytes(b"f1"), |
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292 DirstateEntry { |
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293 state: EntryState::Normal, |
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294 mode: 0o644, |
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295 size: 0, |
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296 mtime: 791231220, |
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297 }, |
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298 )] |
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299 .iter() |
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300 .cloned() |
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301 .collect(); |
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302 let mut state_map = expected_state_map.clone(); |
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303 let mut copymap = FastHashMap::default(); |
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304 copymap.insert( |
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305 HgPathBuf::from_bytes(b"f1"), |
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306 HgPathBuf::from_bytes(b"copyname"), |
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307 ); |
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308 let parents = DirstateParents { |
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309 p1: *b"12345678910111213141", |
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310 p2: *b"00000000000000000000", |
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311 }; |
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312 let now = Duration::new(15000000, 0); |
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313 let expected = [ |
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314 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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315 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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316 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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317 41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, 112, 121, 110, 97, |
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318 109, 101, |
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319 ] |
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320 .to_vec(); |
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321 |
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322 assert_eq!( |
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323 expected, |
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324 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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325 ); |
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326 assert_eq!(expected_state_map, state_map); |
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327 } |
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328 |
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329 #[test] |
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330 fn test_parse_pack_one_entry_with_copy() { |
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331 let mut state_map: StateMap = [( |
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332 HgPathBuf::from_bytes(b"f1"), |
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333 DirstateEntry { |
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334 state: EntryState::Normal, |
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335 mode: 0o644, |
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336 size: 0, |
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337 mtime: 791231220, |
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338 }, |
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339 )] |
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340 .iter() |
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341 .cloned() |
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342 .collect(); |
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343 let mut copymap = FastHashMap::default(); |
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344 copymap.insert( |
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345 HgPathBuf::from_bytes(b"f1"), |
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346 HgPathBuf::from_bytes(b"copyname"), |
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347 ); |
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348 let parents = DirstateParents { |
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349 p1: *b"12345678910111213141", |
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350 p2: *b"00000000000000000000", |
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351 }; |
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352 let now = Duration::new(15000000, 0); |
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353 let result = |
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354 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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355 .unwrap(); |
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356 |
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357 let (new_parents, entries, copies) = |
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358 parse_dirstate(result.as_slice()).unwrap(); |
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359 let new_state_map: StateMap = entries |
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360 .into_iter() |
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361 .map(|(path, entry)| (path.to_owned(), entry)) |
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362 .collect(); |
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363 let new_copy_map: CopyMap = copies |
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364 .into_iter() |
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365 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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366 .collect(); |
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367 |
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368 assert_eq!( |
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369 (parents, state_map, copymap), |
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370 (new_parents, new_state_map, new_copy_map) |
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371 ) |
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372 } |
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373 |
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374 #[test] |
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375 fn test_parse_pack_multiple_entries_with_copy() { |
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376 let mut state_map: StateMap = [ |
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377 ( |
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378 HgPathBuf::from_bytes(b"f1"), |
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379 DirstateEntry { |
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380 state: EntryState::Normal, |
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381 mode: 0o644, |
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382 size: 0, |
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383 mtime: 791231220, |
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384 }, |
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385 ), |
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386 ( |
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387 HgPathBuf::from_bytes(b"f2"), |
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388 DirstateEntry { |
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389 state: EntryState::Merged, |
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390 mode: 0o777, |
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391 size: 1000, |
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392 mtime: 791231220, |
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393 }, |
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394 ), |
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395 ( |
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396 HgPathBuf::from_bytes(b"f3"), |
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397 DirstateEntry { |
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398 state: EntryState::Removed, |
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399 mode: 0o644, |
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400 size: 234553, |
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401 mtime: 791231220, |
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402 }, |
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403 ), |
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404 ( |
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405 HgPathBuf::from_bytes(b"f4\xF6"), |
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406 DirstateEntry { |
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407 state: EntryState::Added, |
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408 mode: 0o644, |
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409 size: -1, |
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410 mtime: -1, |
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411 }, |
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412 ), |
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413 ] |
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414 .iter() |
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415 .cloned() |
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416 .collect(); |
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417 let mut copymap = FastHashMap::default(); |
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418 copymap.insert( |
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419 HgPathBuf::from_bytes(b"f1"), |
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420 HgPathBuf::from_bytes(b"copyname"), |
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421 ); |
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422 copymap.insert( |
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423 HgPathBuf::from_bytes(b"f4\xF6"), |
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424 HgPathBuf::from_bytes(b"copyname2"), |
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425 ); |
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426 let parents = DirstateParents { |
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427 p1: *b"12345678910111213141", |
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428 p2: *b"00000000000000000000", |
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429 }; |
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430 let now = Duration::new(15000000, 0); |
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431 let result = |
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432 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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433 .unwrap(); |
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434 |
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435 let (new_parents, entries, copies) = |
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436 parse_dirstate(result.as_slice()).unwrap(); |
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437 let new_state_map: StateMap = entries |
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438 .into_iter() |
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439 .map(|(path, entry)| (path.to_owned(), entry)) |
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440 .collect(); |
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441 let new_copy_map: CopyMap = copies |
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442 .into_iter() |
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443 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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444 .collect(); |
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445 |
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446 assert_eq!( |
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447 (parents, state_map, copymap), |
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448 (new_parents, new_state_map, new_copy_map) |
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449 ) |
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450 } |
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451 |
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452 #[test] |
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453 /// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4 |
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454 fn test_parse_pack_one_entry_with_copy_and_time_conflict() { |
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455 let mut state_map: StateMap = [( |
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456 HgPathBuf::from_bytes(b"f1"), |
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457 DirstateEntry { |
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458 state: EntryState::Normal, |
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459 mode: 0o644, |
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460 size: 0, |
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461 mtime: 15000000, |
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462 }, |
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463 )] |
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464 .iter() |
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465 .cloned() |
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466 .collect(); |
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467 let mut copymap = FastHashMap::default(); |
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468 copymap.insert( |
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469 HgPathBuf::from_bytes(b"f1"), |
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470 HgPathBuf::from_bytes(b"copyname"), |
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471 ); |
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472 let parents = DirstateParents { |
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473 p1: *b"12345678910111213141", |
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474 p2: *b"00000000000000000000", |
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475 }; |
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476 let now = Duration::new(15000000, 0); |
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477 let result = |
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478 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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479 .unwrap(); |
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480 |
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481 let (new_parents, entries, copies) = |
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482 parse_dirstate(result.as_slice()).unwrap(); |
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483 let new_state_map: StateMap = entries |
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484 .into_iter() |
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485 .map(|(path, entry)| (path.to_owned(), entry)) |
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486 .collect(); |
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487 let new_copy_map: CopyMap = copies |
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488 .into_iter() |
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489 .map(|(path, copy)| (path.to_owned(), copy.to_owned())) |
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490 .collect(); |
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491 |
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492 assert_eq!( |
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493 ( |
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494 parents, |
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495 [( |
42957
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496 HgPathBuf::from_bytes(b"f1"), |
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497 DirstateEntry { |
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498 state: EntryState::Normal, |
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499 mode: 0o644, |
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500 size: 0, |
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501 mtime: -1 |
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502 } |
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503 )] |
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504 .iter() |
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505 .cloned() |
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506 .collect::<StateMap>(), |
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507 copymap, |
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508 ), |
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509 (new_parents, new_state_map, new_copy_map) |
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510 ) |
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511 } |
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512 } |