Mercurial > hg
annotate rust/hg-core/src/dirstate/parsers.rs @ 42424:d3b5cbe311d9
rust-dirstate: create dirstate submodule
This change is here to facilitate a future patch that is written in a
different file. I expect this module to grow a few different files.
Differential Revision: https://phab.mercurial-scm.org/D6389
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 16 May 2019 16:22:20 +0200 |
parents | rust/hg-core/src/dirstate.rs@d1786c1d34fa |
children | 326fdce22fb2 |
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 byteorder::{BigEndian, ReadBytesExt, WriteBytesExt}; |
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7 use std::collections::HashMap; |
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8 use std::io::Cursor; |
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9 use { |
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10 CopyVec, CopyVecEntry, DirstateEntry, DirstatePackError, DirstateParents, |
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11 DirstateParseError, DirstateVec, |
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12 }; |
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13 |
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14 /// Parents are stored in the dirstate as byte hashes. |
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15 const PARENT_SIZE: usize = 20; |
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16 /// Dirstate entries have a static part of 8 + 32 + 32 + 32 + 32 bits. |
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17 const MIN_ENTRY_SIZE: usize = 17; |
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18 |
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19 pub fn parse_dirstate( |
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20 contents: &[u8], |
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21 ) -> Result<(DirstateParents, DirstateVec, CopyVec), DirstateParseError> { |
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22 if contents.len() < PARENT_SIZE * 2 { |
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23 return Err(DirstateParseError::TooLittleData); |
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24 } |
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25 |
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26 let mut dirstate_vec = vec![]; |
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27 let mut copies = vec![]; |
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28 let mut curr_pos = PARENT_SIZE * 2; |
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29 let parents = DirstateParents { |
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30 p1: &contents[..PARENT_SIZE], |
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31 p2: &contents[PARENT_SIZE..curr_pos], |
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32 }; |
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33 |
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34 while curr_pos < contents.len() { |
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35 if curr_pos + MIN_ENTRY_SIZE > contents.len() { |
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36 return Err(DirstateParseError::Overflow); |
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37 } |
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38 let entry_bytes = &contents[curr_pos..]; |
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39 |
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40 let mut cursor = Cursor::new(entry_bytes); |
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41 let state = cursor.read_i8()?; |
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42 let mode = cursor.read_i32::<BigEndian>()?; |
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43 let size = cursor.read_i32::<BigEndian>()?; |
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44 let mtime = cursor.read_i32::<BigEndian>()?; |
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45 let path_len = cursor.read_i32::<BigEndian>()? as usize; |
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46 |
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47 if path_len > contents.len() - curr_pos { |
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48 return Err(DirstateParseError::Overflow); |
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49 } |
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50 |
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51 // Slice instead of allocating a Vec needed for `read_exact` |
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52 let path = &entry_bytes[MIN_ENTRY_SIZE..MIN_ENTRY_SIZE + (path_len)]; |
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53 |
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54 let (path, copy) = match memchr::memchr(0, path) { |
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55 None => (path, None), |
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56 Some(i) => (&path[..i], Some(&path[(i + 1)..])), |
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57 }; |
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58 |
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59 if let Some(copy_path) = copy { |
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60 copies.push(CopyVecEntry { path, copy_path }); |
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61 }; |
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62 dirstate_vec.push(( |
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63 path.to_owned(), |
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64 DirstateEntry { |
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65 state, |
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66 mode, |
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67 size, |
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68 mtime, |
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69 }, |
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70 )); |
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71 curr_pos = curr_pos + MIN_ENTRY_SIZE + (path_len); |
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72 } |
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73 |
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74 Ok((parents, dirstate_vec, copies)) |
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75 } |
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76 |
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77 pub fn pack_dirstate( |
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78 dirstate_vec: &DirstateVec, |
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79 copymap: &HashMap<Vec<u8>, Vec<u8>>, |
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80 parents: DirstateParents, |
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81 now: i32, |
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82 ) -> Result<(Vec<u8>, DirstateVec), DirstatePackError> { |
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83 if parents.p1.len() != PARENT_SIZE || parents.p2.len() != PARENT_SIZE { |
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84 return Err(DirstatePackError::CorruptedParent); |
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85 } |
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86 |
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87 let expected_size: usize = dirstate_vec |
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88 .iter() |
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89 .map(|(ref filename, _)| { |
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90 let mut length = MIN_ENTRY_SIZE + filename.len(); |
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91 if let Some(ref copy) = copymap.get(filename) { |
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92 length += copy.len() + 1; |
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93 } |
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94 length |
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95 }) |
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96 .sum(); |
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97 let expected_size = expected_size + PARENT_SIZE * 2; |
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98 |
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99 let mut packed = Vec::with_capacity(expected_size); |
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100 let mut new_dirstate_vec = vec![]; |
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101 |
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102 packed.extend(parents.p1); |
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103 packed.extend(parents.p2); |
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104 |
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105 for (ref filename, entry) in dirstate_vec { |
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106 let mut new_filename: Vec<u8> = filename.to_owned(); |
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107 let mut new_mtime: i32 = entry.mtime; |
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108 if entry.state == 'n' as i8 && entry.mtime == now.into() { |
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109 // The file was last modified "simultaneously" with the current |
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110 // write to dirstate (i.e. within the same second for file- |
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111 // systems with a granularity of 1 sec). This commonly happens |
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112 // for at least a couple of files on 'update'. |
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113 // The user could change the file without changing its size |
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114 // within the same second. Invalidate the file's mtime in |
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115 // dirstate, forcing future 'status' calls to compare the |
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116 // contents of the file if the size is the same. This prevents |
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117 // mistakenly treating such files as clean. |
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118 new_mtime = -1; |
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119 new_dirstate_vec.push(( |
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120 filename.to_owned(), |
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121 DirstateEntry { |
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122 mtime: new_mtime, |
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123 ..*entry |
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124 }, |
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125 )); |
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126 } |
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127 |
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128 if let Some(copy) = copymap.get(filename) { |
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129 new_filename.push('\0' as u8); |
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130 new_filename.extend(copy); |
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131 } |
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132 |
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133 packed.write_i8(entry.state)?; |
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134 packed.write_i32::<BigEndian>(entry.mode)?; |
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135 packed.write_i32::<BigEndian>(entry.size)?; |
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136 packed.write_i32::<BigEndian>(new_mtime)?; |
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137 packed.write_i32::<BigEndian>(new_filename.len() as i32)?; |
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138 packed.extend(new_filename) |
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139 } |
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140 |
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141 if packed.len() != expected_size { |
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142 return Err(DirstatePackError::BadSize(expected_size, packed.len())); |
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143 } |
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144 |
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145 Ok((packed, new_dirstate_vec)) |
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146 } |
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147 |
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148 #[cfg(test)] |
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149 mod tests { |
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150 use super::*; |
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151 |
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152 #[test] |
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153 fn test_pack_dirstate_empty() { |
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154 let dirstate_vec: DirstateVec = vec![]; |
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155 let copymap = HashMap::new(); |
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156 let parents = DirstateParents { |
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157 p1: b"12345678910111213141", |
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158 p2: b"00000000000000000000", |
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159 }; |
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160 let now: i32 = 15000000; |
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161 let expected = |
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162 (b"1234567891011121314100000000000000000000".to_vec(), vec![]); |
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163 |
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164 assert_eq!( |
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165 expected, |
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166 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap() |
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167 ); |
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168 } |
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169 #[test] |
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170 fn test_pack_dirstate_one_entry() { |
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171 let dirstate_vec: DirstateVec = vec![( |
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172 vec!['f' as u8, '1' as u8], |
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173 DirstateEntry { |
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174 state: 'n' as i8, |
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175 mode: 0o644, |
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176 size: 0, |
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177 mtime: 791231220, |
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178 }, |
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179 )]; |
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180 let copymap = HashMap::new(); |
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181 let parents = DirstateParents { |
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182 p1: b"12345678910111213141", |
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183 p2: b"00000000000000000000", |
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184 }; |
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185 let now: i32 = 15000000; |
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186 let expected = ( |
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187 [ |
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188 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, |
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189 49, 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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190 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, |
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191 0, 0, 0, 47, 41, 58, 244, 0, 0, 0, 2, 102, 49, |
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192 ] |
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193 .to_vec(), |
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194 vec![], |
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195 ); |
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196 |
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197 assert_eq!( |
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198 expected, |
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199 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap() |
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200 ); |
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201 } |
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202 #[test] |
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203 fn test_pack_dirstate_one_entry_with_copy() { |
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204 let dirstate_vec: DirstateVec = vec![( |
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205 b"f1".to_vec(), |
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206 DirstateEntry { |
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207 state: 'n' as i8, |
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208 mode: 0o644, |
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209 size: 0, |
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210 mtime: 791231220, |
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211 }, |
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212 )]; |
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213 let mut copymap = HashMap::new(); |
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214 copymap.insert(b"f1".to_vec(), b"copyname".to_vec()); |
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215 let parents = DirstateParents { |
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216 p1: b"12345678910111213141", |
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217 p2: b"00000000000000000000", |
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218 }; |
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219 let now: i32 = 15000000; |
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220 let expected = ( |
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221 [ |
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222 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, |
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223 49, 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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224 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, |
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225 0, 0, 0, 47, 41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, |
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226 112, 121, 110, 97, 109, 101, |
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227 ] |
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228 .to_vec(), |
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229 vec![], |
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230 ); |
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231 |
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232 assert_eq!( |
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233 expected, |
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234 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap() |
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235 ); |
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236 } |
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237 |
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238 #[test] |
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239 fn test_parse_pack_one_entry_with_copy() { |
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240 let dirstate_vec: DirstateVec = vec![( |
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241 b"f1".to_vec(), |
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242 DirstateEntry { |
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243 state: 'n' as i8, |
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244 mode: 0o644, |
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245 size: 0, |
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246 mtime: 791231220, |
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247 }, |
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248 )]; |
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249 let mut copymap = HashMap::new(); |
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250 copymap.insert(b"f1".to_vec(), b"copyname".to_vec()); |
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251 let parents = DirstateParents { |
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252 p1: b"12345678910111213141", |
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253 p2: b"00000000000000000000", |
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254 }; |
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255 let now: i32 = 15000000; |
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256 let result = |
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257 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap(); |
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258 |
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259 assert_eq!( |
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260 ( |
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261 parents, |
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262 dirstate_vec, |
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263 copymap |
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264 .iter() |
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265 .map(|(k, v)| CopyVecEntry { |
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266 path: k.as_slice(), |
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267 copy_path: v.as_slice() |
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268 }) |
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269 .collect() |
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270 ), |
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271 parse_dirstate(result.0.as_slice()).unwrap() |
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272 ) |
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273 } |
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274 |
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275 #[test] |
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276 fn test_parse_pack_multiple_entries_with_copy() { |
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277 let dirstate_vec: DirstateVec = vec![ |
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278 ( |
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279 b"f1".to_vec(), |
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280 DirstateEntry { |
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281 state: 'n' as i8, |
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282 mode: 0o644, |
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283 size: 0, |
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284 mtime: 791231220, |
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285 }, |
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286 ), |
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287 ( |
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288 b"f2".to_vec(), |
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289 DirstateEntry { |
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290 state: 'm' as i8, |
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291 mode: 0o777, |
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292 size: 1000, |
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293 mtime: 791231220, |
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294 }, |
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295 ), |
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296 ( |
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297 b"f3".to_vec(), |
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298 DirstateEntry { |
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299 state: 'r' as i8, |
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300 mode: 0o644, |
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301 size: 234553, |
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302 mtime: 791231220, |
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303 }, |
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304 ), |
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305 ( |
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306 b"f4\xF6".to_vec(), |
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307 DirstateEntry { |
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308 state: 'a' as i8, |
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309 mode: 0o644, |
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310 size: -1, |
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311 mtime: -1, |
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312 }, |
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313 ), |
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314 ]; |
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315 let mut copymap = HashMap::new(); |
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316 copymap.insert(b"f1".to_vec(), b"copyname".to_vec()); |
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317 copymap.insert(b"f4\xF6".to_vec(), b"copyname2".to_vec()); |
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318 let parents = DirstateParents { |
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319 p1: b"12345678910111213141", |
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320 p2: b"00000000000000000000", |
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321 }; |
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322 let now: i32 = 15000000; |
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323 let result = |
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324 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap(); |
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325 |
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326 assert_eq!( |
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327 (parents, dirstate_vec, copymap), |
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328 parse_dirstate(result.0.as_slice()) |
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329 .and_then(|(p, dvec, cvec)| Ok(( |
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330 p, |
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331 dvec, |
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332 cvec.iter() |
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333 .map(|entry| ( |
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334 entry.path.to_vec(), |
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335 entry.copy_path.to_vec() |
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336 )) |
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337 .collect() |
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338 ))) |
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339 .unwrap() |
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340 ) |
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341 } |
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342 |
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343 #[test] |
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344 /// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4 |
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345 fn test_parse_pack_one_entry_with_copy_and_time_conflict() { |
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346 let dirstate_vec: DirstateVec = vec![( |
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347 b"f1".to_vec(), |
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348 DirstateEntry { |
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349 state: 'n' as i8, |
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350 mode: 0o644, |
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351 size: 0, |
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352 mtime: 15000000, |
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353 }, |
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354 )]; |
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355 let mut copymap = HashMap::new(); |
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356 copymap.insert(b"f1".to_vec(), b"copyname".to_vec()); |
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357 let parents = DirstateParents { |
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358 p1: b"12345678910111213141", |
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359 p2: b"00000000000000000000", |
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360 }; |
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361 let now: i32 = 15000000; |
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362 let result = |
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363 pack_dirstate(&dirstate_vec, ©map, parents, now).unwrap(); |
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364 |
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365 assert_eq!( |
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366 ( |
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367 parents, |
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368 vec![( |
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369 b"f1".to_vec(), |
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370 DirstateEntry { |
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371 state: 'n' as i8, |
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372 mode: 0o644, |
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373 size: 0, |
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374 mtime: -1 |
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375 } |
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376 )], |
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377 copymap |
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378 .iter() |
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379 .map(|(k, v)| CopyVecEntry { |
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380 path: k.as_slice(), |
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381 copy_path: v.as_slice() |
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382 }) |
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383 .collect() |
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384 ), |
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385 parse_dirstate(result.0.as_slice()).unwrap() |
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386 ) |
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387 } |
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388 } |