Mercurial > hg
annotate rust/hg-core/src/dirstate/parsers.rs @ 44541:d880805d5442
hg-core: add function timing information
This change makes use of the newly added logging infrastructure to trace the
execution time of some important calls.
This approach is very much complementary to using a profiler and will not
guard against out-of-order execution or other kinds of compiler optimizations.
That said, it is useful to get a rough high-level idea of where time is spent.
Differential Revision: https://phab.mercurial-scm.org/D8253
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Fri, 06 Mar 2020 18:08:23 +0100 |
parents | 5ac243a92e37 |
children | 26114bd6ec60 |
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::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 // TODO parse/pack: is mutate-on-loop better for performance? |
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23 |
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24 #[timed] |
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25 pub fn parse_dirstate( |
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26 state_map: &mut StateMap, |
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27 copy_map: &mut CopyMap, |
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28 contents: &[u8], |
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29 ) -> Result<DirstateParents, DirstateParseError> { |
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30 if contents.len() < PARENT_SIZE * 2 { |
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31 return Err(DirstateParseError::TooLittleData); |
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32 } |
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33 |
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34 let mut curr_pos = PARENT_SIZE * 2; |
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35 let parents = DirstateParents { |
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36 p1: contents[..PARENT_SIZE].try_into().unwrap(), |
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37 p2: contents[PARENT_SIZE..curr_pos].try_into().unwrap(), |
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38 }; |
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39 |
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40 while curr_pos < contents.len() { |
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41 if curr_pos + MIN_ENTRY_SIZE > contents.len() { |
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42 return Err(DirstateParseError::Overflow); |
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43 } |
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44 let entry_bytes = &contents[curr_pos..]; |
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45 |
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46 let mut cursor = Cursor::new(entry_bytes); |
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47 let state = EntryState::try_from(cursor.read_u8()?)?; |
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48 let mode = cursor.read_i32::<BigEndian>()?; |
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49 let size = cursor.read_i32::<BigEndian>()?; |
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50 let mtime = cursor.read_i32::<BigEndian>()?; |
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51 let path_len = cursor.read_i32::<BigEndian>()? as usize; |
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52 |
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53 if path_len > contents.len() - curr_pos { |
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54 return Err(DirstateParseError::Overflow); |
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55 } |
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56 |
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57 // Slice instead of allocating a Vec needed for `read_exact` |
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58 let path = &entry_bytes[MIN_ENTRY_SIZE..MIN_ENTRY_SIZE + (path_len)]; |
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59 |
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60 let (path, copy) = match memchr::memchr(0, path) { |
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61 None => (path, None), |
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62 Some(i) => (&path[..i], Some(&path[(i + 1)..])), |
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63 }; |
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64 |
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65 if let Some(copy_path) = copy { |
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66 copy_map.insert( |
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67 HgPath::new(path).to_owned(), |
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68 HgPath::new(copy_path).to_owned(), |
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69 ); |
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70 }; |
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71 state_map.insert( |
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72 HgPath::new(path).to_owned(), |
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73 DirstateEntry { |
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74 state, |
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75 mode, |
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76 size, |
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77 mtime, |
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78 }, |
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79 ); |
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80 curr_pos = curr_pos + MIN_ENTRY_SIZE + (path_len); |
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81 } |
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82 |
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83 Ok(parents) |
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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 pub fn pack_dirstate( |
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88 state_map: &mut StateMap, |
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89 copy_map: &CopyMap, |
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90 parents: DirstateParents, |
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91 now: Duration, |
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92 ) -> Result<Vec<u8>, DirstatePackError> { |
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93 // TODO move away from i32 before 2038. |
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94 let now: i32 = now.as_secs().try_into().expect("time overflow"); |
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95 |
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96 let expected_size: usize = state_map |
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97 .iter() |
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98 .map(|(filename, _)| { |
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99 let mut length = MIN_ENTRY_SIZE + filename.len(); |
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100 if let Some(copy) = copy_map.get(filename) { |
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101 length += copy.len() + 1; |
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102 } |
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103 length |
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104 }) |
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105 .sum(); |
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106 let expected_size = expected_size + PARENT_SIZE * 2; |
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107 |
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108 let mut packed = Vec::with_capacity(expected_size); |
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109 let mut new_state_map = vec![]; |
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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() { |
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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 new_state_map.push(( |
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129 filename.to_owned(), |
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130 DirstateEntry { |
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131 mtime: new_mtime, |
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132 ..*entry |
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133 }, |
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134 )); |
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135 } |
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136 let mut new_filename = new_filename.into_vec(); |
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137 if let Some(copy) = copy_map.get(filename) { |
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138 new_filename.push('\0' as u8); |
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139 new_filename.extend(copy.bytes()); |
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140 } |
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141 |
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142 packed.write_u8(entry.state.into())?; |
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143 packed.write_i32::<BigEndian>(entry.mode)?; |
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144 packed.write_i32::<BigEndian>(entry.size)?; |
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145 packed.write_i32::<BigEndian>(new_mtime)?; |
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146 packed.write_i32::<BigEndian>(new_filename.len() as i32)?; |
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147 packed.extend(new_filename) |
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148 } |
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149 |
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150 if packed.len() != expected_size { |
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151 return Err(DirstatePackError::BadSize(expected_size, packed.len())); |
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152 } |
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153 |
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154 state_map.extend(new_state_map); |
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155 |
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156 Ok(packed) |
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157 } |
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158 |
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159 #[cfg(test)] |
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160 mod tests { |
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161 use super::*; |
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162 use crate::{utils::hg_path::HgPathBuf, FastHashMap}; |
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163 |
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164 #[test] |
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165 fn test_pack_dirstate_empty() { |
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166 let mut state_map: StateMap = FastHashMap::default(); |
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167 let copymap = FastHashMap::default(); |
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168 let parents = DirstateParents { |
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169 p1: *b"12345678910111213141", |
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170 p2: *b"00000000000000000000", |
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171 }; |
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172 let now = Duration::new(15000000, 0); |
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173 let expected = b"1234567891011121314100000000000000000000".to_vec(); |
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174 |
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175 assert_eq!( |
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176 expected, |
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177 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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178 ); |
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179 |
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180 assert!(state_map.is_empty()) |
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181 } |
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182 #[test] |
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183 fn test_pack_dirstate_one_entry() { |
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184 let expected_state_map: StateMap = [( |
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185 HgPathBuf::from_bytes(b"f1"), |
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186 DirstateEntry { |
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187 state: EntryState::Normal, |
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188 mode: 0o644, |
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189 size: 0, |
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190 mtime: 791231220, |
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191 }, |
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192 )] |
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193 .iter() |
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194 .cloned() |
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195 .collect(); |
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196 let mut state_map = expected_state_map.clone(); |
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197 |
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198 let copymap = FastHashMap::default(); |
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199 let parents = DirstateParents { |
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200 p1: *b"12345678910111213141", |
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201 p2: *b"00000000000000000000", |
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202 }; |
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203 let now = Duration::new(15000000, 0); |
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204 let expected = [ |
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205 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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206 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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207 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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208 41, 58, 244, 0, 0, 0, 2, 102, 49, |
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209 ] |
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210 .to_vec(); |
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211 |
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212 assert_eq!( |
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213 expected, |
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214 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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215 ); |
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216 |
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217 assert_eq!(expected_state_map, state_map); |
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218 } |
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219 #[test] |
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220 fn test_pack_dirstate_one_entry_with_copy() { |
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221 let expected_state_map: StateMap = [( |
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222 HgPathBuf::from_bytes(b"f1"), |
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223 DirstateEntry { |
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224 state: EntryState::Normal, |
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225 mode: 0o644, |
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226 size: 0, |
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227 mtime: 791231220, |
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228 }, |
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229 )] |
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230 .iter() |
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231 .cloned() |
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232 .collect(); |
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233 let mut state_map = expected_state_map.clone(); |
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234 let mut copymap = FastHashMap::default(); |
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235 copymap.insert( |
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236 HgPathBuf::from_bytes(b"f1"), |
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237 HgPathBuf::from_bytes(b"copyname"), |
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238 ); |
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239 let parents = DirstateParents { |
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240 p1: *b"12345678910111213141", |
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241 p2: *b"00000000000000000000", |
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242 }; |
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243 let now = Duration::new(15000000, 0); |
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244 let expected = [ |
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245 49, 50, 51, 52, 53, 54, 55, 56, 57, 49, 48, 49, 49, 49, 50, 49, |
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246 51, 49, 52, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, |
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247 48, 48, 48, 48, 48, 48, 48, 48, 110, 0, 0, 1, 164, 0, 0, 0, 0, 47, |
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248 41, 58, 244, 0, 0, 0, 11, 102, 49, 0, 99, 111, 112, 121, 110, 97, |
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249 109, 101, |
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250 ] |
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251 .to_vec(); |
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252 |
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253 assert_eq!( |
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254 expected, |
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255 pack_dirstate(&mut state_map, ©map, parents, now).unwrap() |
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256 ); |
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257 assert_eq!(expected_state_map, state_map); |
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258 } |
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259 |
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260 #[test] |
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261 fn test_parse_pack_one_entry_with_copy() { |
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262 let mut state_map: StateMap = [( |
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263 HgPathBuf::from_bytes(b"f1"), |
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264 DirstateEntry { |
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265 state: EntryState::Normal, |
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266 mode: 0o644, |
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267 size: 0, |
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268 mtime: 791231220, |
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269 }, |
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270 )] |
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271 .iter() |
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272 .cloned() |
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273 .collect(); |
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274 let mut copymap = FastHashMap::default(); |
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275 copymap.insert( |
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276 HgPathBuf::from_bytes(b"f1"), |
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277 HgPathBuf::from_bytes(b"copyname"), |
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278 ); |
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279 let parents = DirstateParents { |
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280 p1: *b"12345678910111213141", |
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281 p2: *b"00000000000000000000", |
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282 }; |
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283 let now = Duration::new(15000000, 0); |
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284 let result = |
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285 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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286 .unwrap(); |
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287 |
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288 let mut new_state_map: StateMap = FastHashMap::default(); |
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289 let mut new_copy_map: CopyMap = FastHashMap::default(); |
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290 let new_parents = parse_dirstate( |
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291 &mut new_state_map, |
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292 &mut new_copy_map, |
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293 result.as_slice(), |
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294 ) |
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295 .unwrap(); |
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296 assert_eq!( |
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297 (parents, state_map, copymap), |
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298 (new_parents, new_state_map, new_copy_map) |
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299 ) |
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300 } |
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301 |
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302 #[test] |
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303 fn test_parse_pack_multiple_entries_with_copy() { |
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304 let mut state_map: StateMap = [ |
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305 ( |
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306 HgPathBuf::from_bytes(b"f1"), |
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307 DirstateEntry { |
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308 state: EntryState::Normal, |
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309 mode: 0o644, |
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310 size: 0, |
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311 mtime: 791231220, |
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312 }, |
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313 ), |
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314 ( |
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315 HgPathBuf::from_bytes(b"f2"), |
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316 DirstateEntry { |
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317 state: EntryState::Merged, |
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318 mode: 0o777, |
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319 size: 1000, |
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320 mtime: 791231220, |
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321 }, |
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322 ), |
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323 ( |
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324 HgPathBuf::from_bytes(b"f3"), |
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325 DirstateEntry { |
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326 state: EntryState::Removed, |
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327 mode: 0o644, |
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328 size: 234553, |
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329 mtime: 791231220, |
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330 }, |
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331 ), |
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332 ( |
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333 HgPathBuf::from_bytes(b"f4\xF6"), |
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334 DirstateEntry { |
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335 state: EntryState::Added, |
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336 mode: 0o644, |
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337 size: -1, |
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338 mtime: -1, |
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339 }, |
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340 ), |
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341 ] |
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342 .iter() |
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343 .cloned() |
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344 .collect(); |
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345 let mut copymap = FastHashMap::default(); |
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346 copymap.insert( |
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347 HgPathBuf::from_bytes(b"f1"), |
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348 HgPathBuf::from_bytes(b"copyname"), |
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349 ); |
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350 copymap.insert( |
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351 HgPathBuf::from_bytes(b"f4\xF6"), |
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352 HgPathBuf::from_bytes(b"copyname2"), |
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353 ); |
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354 let parents = DirstateParents { |
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355 p1: *b"12345678910111213141", |
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356 p2: *b"00000000000000000000", |
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357 }; |
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358 let now = Duration::new(15000000, 0); |
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359 let result = |
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360 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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361 .unwrap(); |
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362 |
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363 let mut new_state_map: StateMap = FastHashMap::default(); |
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364 let mut new_copy_map: CopyMap = FastHashMap::default(); |
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365 let new_parents = parse_dirstate( |
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366 &mut new_state_map, |
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367 &mut new_copy_map, |
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368 result.as_slice(), |
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369 ) |
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370 .unwrap(); |
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371 assert_eq!( |
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372 (parents, state_map, copymap), |
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373 (new_parents, new_state_map, new_copy_map) |
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374 ) |
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375 } |
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376 |
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377 #[test] |
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378 /// https://www.mercurial-scm.org/repo/hg/rev/af3f26b6bba4 |
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379 fn test_parse_pack_one_entry_with_copy_and_time_conflict() { |
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380 let mut state_map: StateMap = [( |
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381 HgPathBuf::from_bytes(b"f1"), |
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382 DirstateEntry { |
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383 state: EntryState::Normal, |
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384 mode: 0o644, |
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385 size: 0, |
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386 mtime: 15000000, |
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387 }, |
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388 )] |
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389 .iter() |
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390 .cloned() |
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391 .collect(); |
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392 let mut copymap = FastHashMap::default(); |
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393 copymap.insert( |
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394 HgPathBuf::from_bytes(b"f1"), |
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395 HgPathBuf::from_bytes(b"copyname"), |
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396 ); |
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397 let parents = DirstateParents { |
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398 p1: *b"12345678910111213141", |
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399 p2: *b"00000000000000000000", |
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400 }; |
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401 let now = Duration::new(15000000, 0); |
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402 let result = |
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403 pack_dirstate(&mut state_map, ©map, parents.clone(), now) |
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404 .unwrap(); |
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405 |
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406 let mut new_state_map: StateMap = FastHashMap::default(); |
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407 let mut new_copy_map: CopyMap = FastHashMap::default(); |
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408 let new_parents = parse_dirstate( |
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409 &mut new_state_map, |
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410 &mut new_copy_map, |
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411 result.as_slice(), |
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412 ) |
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413 .unwrap(); |
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414 |
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415 assert_eq!( |
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416 ( |
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417 parents, |
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418 [( |
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419 HgPathBuf::from_bytes(b"f1"), |
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420 DirstateEntry { |
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421 state: EntryState::Normal, |
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422 mode: 0o644, |
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423 size: 0, |
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424 mtime: -1 |
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425 } |
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426 )] |
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427 .iter() |
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428 .cloned() |
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429 .collect::<StateMap>(), |
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430 copymap, |
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431 ), |
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432 (new_parents, new_state_map, new_copy_map) |
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433 ) |
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434 } |
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435 } |