Mercurial > hg
annotate rust/hg-core/src/utils/files.rs @ 44535:07d9fd6097e6
rust-pathauditor: use interior mutability for use in multi-threaded contexts
The usual recommendation for using `RwLock` or `Mutex` is that if there are
about as many write as there are reads, use `Mutex`, and if there are more
reads than writes, use `RwLock`.
If after the main bottleneck (i.e. parallel traversal) is removed this shows
up on profiles, we should investigate using the `parking_lot` since we don't
need a poisoning API, or maybe move to different types of caches entirely.
Differential Revision: https://phab.mercurial-scm.org/D8213
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Wed, 04 Mar 2020 15:10:11 +0100 |
parents | 4caac36c66bc |
children | 26114bd6ec60 |
rev | line source |
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1 // files.rs |
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2 // |
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3 // Copyright 2019 |
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4 // Raphaël Gomès <rgomes@octobus.net>, |
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5 // Yuya Nishihara <yuya@tcha.org> |
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6 // |
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7 // This software may be used and distributed according to the terms of the |
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8 // GNU General Public License version 2 or any later version. |
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9 |
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10 //! Functions for fiddling with files. |
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11 |
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12 use crate::utils::{ |
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13 hg_path::{path_to_hg_path_buf, HgPath, HgPathBuf, HgPathError}, |
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14 path_auditor::PathAuditor, |
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15 replace_slice, |
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16 }; |
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17 use lazy_static::lazy_static; |
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18 use same_file::is_same_file; |
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19 use std::borrow::ToOwned; |
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20 use std::fs::Metadata; |
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21 use std::iter::FusedIterator; |
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22 use std::ops::Deref; |
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23 use std::path::{Path, PathBuf}; |
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24 |
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25 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path { |
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26 let os_str; |
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27 #[cfg(unix)] |
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28 { |
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29 use std::os::unix::ffi::OsStrExt; |
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30 os_str = std::ffi::OsStr::from_bytes(bytes); |
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31 } |
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32 // TODO Handle other platforms |
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33 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding). |
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34 // Perhaps, the return type would have to be Result<PathBuf>. |
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35 |
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36 Path::new(os_str) |
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37 } |
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38 |
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39 // TODO: need to convert from WTF8 to MBCS bytes on Windows. |
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40 // that's why Vec<u8> is returned. |
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41 #[cfg(unix)] |
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42 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> { |
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43 use std::os::unix::ffi::OsStrExt; |
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44 path.as_ref().as_os_str().as_bytes().to_vec() |
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45 } |
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46 |
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47 /// An iterator over repository path yielding itself and its ancestors. |
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48 #[derive(Copy, Clone, Debug)] |
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49 pub struct Ancestors<'a> { |
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50 next: Option<&'a HgPath>, |
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51 } |
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52 |
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53 impl<'a> Iterator for Ancestors<'a> { |
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54 type Item = &'a HgPath; |
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55 |
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56 fn next(&mut self) -> Option<Self::Item> { |
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57 let next = self.next; |
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58 self.next = match self.next { |
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59 Some(s) if s.is_empty() => None, |
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60 Some(s) => { |
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61 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0); |
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62 Some(HgPath::new(&s.as_bytes()[..p])) |
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63 } |
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64 None => None, |
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65 }; |
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66 next |
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67 } |
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68 } |
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69 |
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70 impl<'a> FusedIterator for Ancestors<'a> {} |
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71 |
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72 /// An iterator over repository path yielding itself and its ancestors. |
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73 #[derive(Copy, Clone, Debug)] |
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74 pub(crate) struct AncestorsWithBase<'a> { |
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75 next: Option<(&'a HgPath, &'a HgPath)>, |
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76 } |
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77 |
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78 impl<'a> Iterator for AncestorsWithBase<'a> { |
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79 type Item = (&'a HgPath, &'a HgPath); |
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80 |
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81 fn next(&mut self) -> Option<Self::Item> { |
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82 let next = self.next; |
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83 self.next = match self.next { |
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84 Some((s, _)) if s.is_empty() => None, |
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85 Some((s, _)) => Some(s.split_filename()), |
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86 None => None, |
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87 }; |
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88 next |
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89 } |
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90 } |
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91 |
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92 impl<'a> FusedIterator for AncestorsWithBase<'a> {} |
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93 |
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94 /// Returns an iterator yielding ancestor directories of the given repository |
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95 /// path. |
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96 /// |
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97 /// The path is separated by '/', and must not start with '/'. |
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98 /// |
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99 /// The path itself isn't included unless it is b"" (meaning the root |
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100 /// directory.) |
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101 pub fn find_dirs<'a>(path: &'a HgPath) -> Ancestors<'a> { |
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102 let mut dirs = Ancestors { next: Some(path) }; |
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103 if !path.is_empty() { |
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104 dirs.next(); // skip itself |
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105 } |
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106 dirs |
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107 } |
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108 |
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109 /// Returns an iterator yielding ancestor directories of the given repository |
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110 /// path. |
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111 /// |
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112 /// The path is separated by '/', and must not start with '/'. |
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113 /// |
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114 /// The path itself isn't included unless it is b"" (meaning the root |
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115 /// directory.) |
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116 pub(crate) fn find_dirs_with_base<'a>( |
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117 path: &'a HgPath, |
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118 ) -> AncestorsWithBase<'a> { |
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119 let mut dirs = AncestorsWithBase { |
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120 next: Some((path, HgPath::new(b""))), |
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121 }; |
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122 if !path.is_empty() { |
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123 dirs.next(); // skip itself |
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124 } |
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125 dirs |
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126 } |
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127 |
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128 /// TODO more than ASCII? |
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129 pub fn normalize_case(path: &HgPath) -> HgPathBuf { |
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130 #[cfg(windows)] // NTFS compares via upper() |
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131 return path.to_ascii_uppercase(); |
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132 #[cfg(unix)] |
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133 path.to_ascii_lowercase() |
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134 } |
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135 |
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136 lazy_static! { |
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137 static ref IGNORED_CHARS: Vec<Vec<u8>> = { |
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138 [ |
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139 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d, |
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140 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff, |
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141 ] |
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142 .iter() |
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143 .map(|code| { |
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144 std::char::from_u32(*code) |
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145 .unwrap() |
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146 .encode_utf8(&mut [0; 3]) |
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147 .bytes() |
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148 .collect() |
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149 }) |
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150 .collect() |
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151 }; |
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152 } |
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153 |
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154 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> { |
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155 let mut buf = bytes.to_owned(); |
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156 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef'); |
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157 if needs_escaping { |
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158 for forbidden in IGNORED_CHARS.iter() { |
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159 replace_slice(&mut buf, forbidden, &[]) |
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160 } |
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161 buf |
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162 } else { |
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163 buf |
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164 } |
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165 } |
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166 |
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167 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> { |
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168 hfs_ignore_clean(&bytes.to_ascii_lowercase()) |
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169 } |
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170 |
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171 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)] |
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172 pub struct HgMetadata { |
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173 pub st_dev: u64, |
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174 pub st_mode: u32, |
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175 pub st_nlink: u64, |
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176 pub st_size: u64, |
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177 pub st_mtime: i64, |
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178 pub st_ctime: i64, |
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179 } |
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180 |
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181 // TODO support other plaforms |
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182 #[cfg(unix)] |
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183 impl HgMetadata { |
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184 pub fn from_metadata(metadata: Metadata) -> Self { |
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185 use std::os::unix::fs::MetadataExt; |
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186 Self { |
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187 st_dev: metadata.dev(), |
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188 st_mode: metadata.mode(), |
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189 st_nlink: metadata.nlink(), |
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190 st_size: metadata.size(), |
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191 st_mtime: metadata.mtime(), |
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192 st_ctime: metadata.ctime(), |
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193 } |
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194 } |
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195 } |
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196 |
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197 /// Returns the canonical path of `name`, given `cwd` and `root` |
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198 pub fn canonical_path( |
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199 root: impl AsRef<Path>, |
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200 cwd: impl AsRef<Path>, |
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201 name: impl AsRef<Path>, |
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202 ) -> Result<PathBuf, HgPathError> { |
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203 // TODO add missing normalization for other platforms |
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204 let root = root.as_ref(); |
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205 let cwd = cwd.as_ref(); |
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206 let name = name.as_ref(); |
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207 |
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208 let name = if !name.is_absolute() { |
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209 root.join(&cwd).join(&name) |
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210 } else { |
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211 name.to_owned() |
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212 }; |
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213 let auditor = PathAuditor::new(&root); |
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214 if name != root && name.starts_with(&root) { |
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215 let name = name.strip_prefix(&root).unwrap(); |
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216 auditor.audit_path(path_to_hg_path_buf(name)?)?; |
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217 return Ok(name.to_owned()); |
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218 } else if name == root { |
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219 return Ok("".into()); |
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220 } else { |
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221 // Determine whether `name' is in the hierarchy at or beneath `root', |
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222 // by iterating name=name.parent() until it returns `None` (can't |
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223 // check name == '/', because that doesn't work on windows). |
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224 let mut name = name.deref(); |
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225 let original_name = name.to_owned(); |
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226 loop { |
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227 let same = is_same_file(&name, &root).unwrap_or(false); |
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228 if same { |
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229 if name == original_name { |
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230 // `name` was actually the same as root (maybe a symlink) |
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231 return Ok("".into()); |
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232 } |
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233 // `name` is a symlink to root, so `original_name` is under |
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234 // root |
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235 let rel_path = original_name.strip_prefix(&name).unwrap(); |
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236 auditor.audit_path(path_to_hg_path_buf(&rel_path)?)?; |
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237 return Ok(rel_path.to_owned()); |
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238 } |
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239 name = match name.parent() { |
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240 None => break, |
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241 Some(p) => p, |
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242 }; |
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243 } |
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244 // TODO hint to the user about using --cwd |
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245 // Bubble up the responsibility to Python for now |
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246 Err(HgPathError::NotUnderRoot { |
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247 path: original_name.to_owned(), |
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248 root: root.to_owned(), |
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249 }) |
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250 } |
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251 } |
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252 |
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253 #[cfg(test)] |
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254 mod tests { |
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255 use super::*; |
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256 use pretty_assertions::assert_eq; |
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257 |
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258 #[test] |
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259 fn find_dirs_some() { |
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260 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz")); |
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261 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar"))); |
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262 assert_eq!(dirs.next(), Some(HgPath::new(b"foo"))); |
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263 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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264 assert_eq!(dirs.next(), None); |
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265 assert_eq!(dirs.next(), None); |
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266 } |
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267 |
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268 #[test] |
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269 fn find_dirs_empty() { |
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270 // looks weird, but mercurial.pathutil.finddirs(b"") yields b"" |
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271 let mut dirs = super::find_dirs(HgPath::new(b"")); |
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272 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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273 assert_eq!(dirs.next(), None); |
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274 assert_eq!(dirs.next(), None); |
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275 } |
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276 |
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277 #[test] |
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278 fn test_find_dirs_with_base_some() { |
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279 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz")); |
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280 assert_eq!( |
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281 dirs.next(), |
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282 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz"))) |
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283 ); |
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284 assert_eq!( |
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285 dirs.next(), |
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286 Some((HgPath::new(b"foo"), HgPath::new(b"bar"))) |
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287 ); |
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288 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo")))); |
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289 assert_eq!(dirs.next(), None); |
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290 assert_eq!(dirs.next(), None); |
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291 } |
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292 |
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293 #[test] |
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294 fn test_find_dirs_with_base_empty() { |
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295 let mut dirs = super::find_dirs_with_base(HgPath::new(b"")); |
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296 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"")))); |
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297 assert_eq!(dirs.next(), None); |
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298 assert_eq!(dirs.next(), None); |
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299 } |
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300 |
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301 #[test] |
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302 fn test_canonical_path() { |
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303 let root = Path::new("/repo"); |
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304 let cwd = Path::new("/dir"); |
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305 let name = Path::new("filename"); |
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306 assert_eq!( |
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307 canonical_path(root, cwd, name), |
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308 Err(HgPathError::NotUnderRoot { |
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309 path: PathBuf::from("/dir/filename"), |
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310 root: root.to_path_buf() |
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311 }) |
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312 ); |
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313 |
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314 let root = Path::new("/repo"); |
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315 let cwd = Path::new("/"); |
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316 let name = Path::new("filename"); |
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317 assert_eq!( |
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318 canonical_path(root, cwd, name), |
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319 Err(HgPathError::NotUnderRoot { |
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320 path: PathBuf::from("/filename"), |
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321 root: root.to_path_buf() |
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322 }) |
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323 ); |
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324 |
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325 let root = Path::new("/repo"); |
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326 let cwd = Path::new("/"); |
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327 let name = Path::new("repo/filename"); |
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328 assert_eq!( |
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329 canonical_path(root, cwd, name), |
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330 Ok(PathBuf::from("filename")) |
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331 ); |
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332 |
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333 let root = Path::new("/repo"); |
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334 let cwd = Path::new("/repo"); |
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335 let name = Path::new("filename"); |
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336 assert_eq!( |
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337 canonical_path(root, cwd, name), |
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338 Ok(PathBuf::from("filename")) |
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339 ); |
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340 |
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341 let root = Path::new("/repo"); |
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342 let cwd = Path::new("/repo/subdir"); |
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343 let name = Path::new("filename"); |
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344 assert_eq!( |
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345 canonical_path(root, cwd, name), |
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346 Ok(PathBuf::from("subdir/filename")) |
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347 ); |
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348 } |
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349 |
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350 #[test] |
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351 fn test_canonical_path_not_rooted() { |
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352 use std::fs::create_dir; |
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353 use tempfile::tempdir; |
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354 |
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355 let base_dir = tempdir().unwrap(); |
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356 let base_dir_path = base_dir.path(); |
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357 let beneath_repo = base_dir_path.join("a"); |
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358 let root = base_dir_path.join("a/b"); |
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359 let out_of_repo = base_dir_path.join("c"); |
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360 let under_repo_symlink = out_of_repo.join("d"); |
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361 |
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362 create_dir(&beneath_repo).unwrap(); |
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363 create_dir(&root).unwrap(); |
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364 |
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365 // TODO make portable |
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366 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap(); |
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367 |
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368 assert_eq!( |
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369 canonical_path(&root, Path::new(""), out_of_repo), |
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370 Ok(PathBuf::from("")) |
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371 ); |
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372 assert_eq!( |
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373 canonical_path(&root, Path::new(""), &beneath_repo), |
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374 Err(HgPathError::NotUnderRoot { |
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375 path: beneath_repo.to_owned(), |
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376 root: root.to_owned() |
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377 }) |
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378 ); |
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379 assert_eq!( |
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380 canonical_path(&root, Path::new(""), &under_repo_symlink), |
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381 Ok(PathBuf::from("d")) |
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382 ); |
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383 } |
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384 } |