Mercurial > hg
annotate rust/hg-core/src/utils/files.rs @ 46596:d2e61f00ee9d
rust: Introduce a get_bytes_from_os_str utility function
It does the same as get_bytes_from_path but takes an `OsStr`
instead of a `Path`. The implementation is the same so using either
ends up correct but the function name suggests it’s not.
Differential Revision: https://phab.mercurial-scm.org/D10007
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 17 Feb 2021 11:21:34 +0100 |
parents | 0d734c0ae1cf |
children | 91ab5190a3de |
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::{Cow, ToOwned}; |
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20 use std::ffi::OsStr; |
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21 use std::fs::Metadata; |
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22 use std::iter::FusedIterator; |
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23 use std::ops::Deref; |
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24 use std::path::{Path, PathBuf}; |
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25 |
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26 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path { |
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27 let os_str; |
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28 #[cfg(unix)] |
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29 { |
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30 use std::os::unix::ffi::OsStrExt; |
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31 os_str = std::ffi::OsStr::from_bytes(bytes); |
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32 } |
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33 // TODO Handle other platforms |
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34 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding). |
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35 // Perhaps, the return type would have to be Result<PathBuf>. |
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36 |
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37 Path::new(os_str) |
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38 } |
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39 |
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40 // TODO: need to convert from WTF8 to MBCS bytes on Windows. |
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41 // that's why Vec<u8> is returned. |
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42 #[cfg(unix)] |
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43 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> { |
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44 get_bytes_from_os_str(path.as_ref()) |
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45 } |
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46 |
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47 #[cfg(unix)] |
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48 pub fn get_bytes_from_os_str(str: impl AsRef<OsStr>) -> Vec<u8> { |
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49 use std::os::unix::ffi::OsStrExt; |
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50 str.as_ref().as_bytes().to_vec() |
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51 } |
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52 |
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53 /// An iterator over repository path yielding itself and its ancestors. |
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54 #[derive(Copy, Clone, Debug)] |
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55 pub struct Ancestors<'a> { |
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56 next: Option<&'a HgPath>, |
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57 } |
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58 |
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59 impl<'a> Iterator for Ancestors<'a> { |
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60 type Item = &'a HgPath; |
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61 |
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62 fn next(&mut self) -> Option<Self::Item> { |
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63 let next = self.next; |
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64 self.next = match self.next { |
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65 Some(s) if s.is_empty() => None, |
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66 Some(s) => { |
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67 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0); |
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68 Some(HgPath::new(&s.as_bytes()[..p])) |
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69 } |
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70 None => None, |
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71 }; |
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72 next |
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73 } |
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74 } |
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75 |
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76 impl<'a> FusedIterator for Ancestors<'a> {} |
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77 |
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78 /// An iterator over repository path yielding itself and its ancestors. |
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79 #[derive(Copy, Clone, Debug)] |
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80 pub(crate) struct AncestorsWithBase<'a> { |
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81 next: Option<(&'a HgPath, &'a HgPath)>, |
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82 } |
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83 |
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84 impl<'a> Iterator for AncestorsWithBase<'a> { |
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85 type Item = (&'a HgPath, &'a HgPath); |
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86 |
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87 fn next(&mut self) -> Option<Self::Item> { |
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88 let next = self.next; |
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89 self.next = match self.next { |
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90 Some((s, _)) if s.is_empty() => None, |
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91 Some((s, _)) => Some(s.split_filename()), |
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92 None => None, |
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93 }; |
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94 next |
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95 } |
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96 } |
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97 |
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98 impl<'a> FusedIterator for AncestorsWithBase<'a> {} |
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99 |
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100 /// Returns an iterator yielding ancestor directories of the given repository |
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101 /// path. |
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102 /// |
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103 /// The path is separated by '/', and must not start with '/'. |
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104 /// |
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105 /// The path itself isn't included unless it is b"" (meaning the root |
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106 /// directory.) |
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107 pub fn find_dirs(path: &HgPath) -> Ancestors { |
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108 let mut dirs = Ancestors { next: Some(path) }; |
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109 if !path.is_empty() { |
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110 dirs.next(); // skip itself |
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111 } |
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112 dirs |
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113 } |
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114 |
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115 /// Returns an iterator yielding ancestor directories of the given repository |
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116 /// path. |
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117 /// |
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118 /// The path is separated by '/', and must not start with '/'. |
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119 /// |
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120 /// The path itself isn't included unless it is b"" (meaning the root |
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121 /// directory.) |
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122 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase { |
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123 let mut dirs = AncestorsWithBase { |
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124 next: Some((path, HgPath::new(b""))), |
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125 }; |
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126 if !path.is_empty() { |
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127 dirs.next(); // skip itself |
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128 } |
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129 dirs |
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130 } |
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131 |
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132 /// TODO more than ASCII? |
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133 pub fn normalize_case(path: &HgPath) -> HgPathBuf { |
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134 #[cfg(windows)] // NTFS compares via upper() |
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135 return path.to_ascii_uppercase(); |
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136 #[cfg(unix)] |
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137 path.to_ascii_lowercase() |
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138 } |
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139 |
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140 lazy_static! { |
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141 static ref IGNORED_CHARS: Vec<Vec<u8>> = { |
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142 [ |
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143 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d, |
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144 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff, |
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145 ] |
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146 .iter() |
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147 .map(|code| { |
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148 std::char::from_u32(*code) |
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149 .unwrap() |
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150 .encode_utf8(&mut [0; 3]) |
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151 .bytes() |
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152 .collect() |
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153 }) |
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154 .collect() |
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155 }; |
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156 } |
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157 |
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158 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> { |
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159 let mut buf = bytes.to_owned(); |
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160 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef'); |
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161 if needs_escaping { |
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162 for forbidden in IGNORED_CHARS.iter() { |
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163 replace_slice(&mut buf, forbidden, &[]) |
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164 } |
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165 buf |
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166 } else { |
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167 buf |
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168 } |
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169 } |
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170 |
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171 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> { |
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172 hfs_ignore_clean(&bytes.to_ascii_lowercase()) |
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173 } |
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174 |
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175 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)] |
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176 pub struct HgMetadata { |
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177 pub st_dev: u64, |
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178 pub st_mode: u32, |
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179 pub st_nlink: u64, |
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180 pub st_size: u64, |
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181 pub st_mtime: i64, |
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182 pub st_ctime: i64, |
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183 } |
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184 |
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185 // TODO support other plaforms |
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186 #[cfg(unix)] |
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187 impl HgMetadata { |
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188 pub fn from_metadata(metadata: Metadata) -> Self { |
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189 use std::os::unix::fs::MetadataExt; |
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190 Self { |
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191 st_dev: metadata.dev(), |
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192 st_mode: metadata.mode(), |
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193 st_nlink: metadata.nlink(), |
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194 st_size: metadata.size(), |
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195 st_mtime: metadata.mtime(), |
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196 st_ctime: metadata.ctime(), |
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197 } |
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198 } |
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199 } |
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200 |
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201 /// Returns the canonical path of `name`, given `cwd` and `root` |
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202 pub fn canonical_path( |
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203 root: impl AsRef<Path>, |
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204 cwd: impl AsRef<Path>, |
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205 name: impl AsRef<Path>, |
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206 ) -> Result<PathBuf, HgPathError> { |
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207 // TODO add missing normalization for other platforms |
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208 let root = root.as_ref(); |
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209 let cwd = cwd.as_ref(); |
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210 let name = name.as_ref(); |
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211 |
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212 let name = if !name.is_absolute() { |
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213 root.join(&cwd).join(&name) |
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214 } else { |
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215 name.to_owned() |
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216 }; |
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217 let auditor = PathAuditor::new(&root); |
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218 if name != root && name.starts_with(&root) { |
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219 let name = name.strip_prefix(&root).unwrap(); |
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220 auditor.audit_path(path_to_hg_path_buf(name)?)?; |
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221 Ok(name.to_owned()) |
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222 } else if name == root { |
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223 Ok("".into()) |
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224 } else { |
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225 // Determine whether `name' is in the hierarchy at or beneath `root', |
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226 // by iterating name=name.parent() until it returns `None` (can't |
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227 // check name == '/', because that doesn't work on windows). |
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228 let mut name = name.deref(); |
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229 let original_name = name.to_owned(); |
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230 loop { |
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231 let same = is_same_file(&name, &root).unwrap_or(false); |
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232 if same { |
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233 if name == original_name { |
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234 // `name` was actually the same as root (maybe a symlink) |
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235 return Ok("".into()); |
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236 } |
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237 // `name` is a symlink to root, so `original_name` is under |
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238 // root |
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239 let rel_path = original_name.strip_prefix(&name).unwrap(); |
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240 auditor.audit_path(path_to_hg_path_buf(&rel_path)?)?; |
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241 return Ok(rel_path.to_owned()); |
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242 } |
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243 name = match name.parent() { |
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244 None => break, |
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245 Some(p) => p, |
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246 }; |
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247 } |
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248 // TODO hint to the user about using --cwd |
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249 // Bubble up the responsibility to Python for now |
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250 Err(HgPathError::NotUnderRoot { |
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251 path: original_name.to_owned(), |
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252 root: root.to_owned(), |
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253 }) |
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254 } |
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255 } |
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256 |
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257 /// Returns the representation of the path relative to the current working |
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258 /// directory for display purposes. |
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259 /// |
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260 /// `cwd` is a `HgPath`, so it is considered relative to the root directory |
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261 /// of the repository. |
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262 /// |
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263 /// # Examples |
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264 /// |
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265 /// ``` |
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266 /// use hg::utils::hg_path::HgPath; |
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267 /// use hg::utils::files::relativize_path; |
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268 /// use std::borrow::Cow; |
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269 /// |
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270 /// let file = HgPath::new(b"nested/file"); |
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271 /// let cwd = HgPath::new(b""); |
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272 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file")); |
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273 /// |
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274 /// let cwd = HgPath::new(b"nested"); |
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275 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file")); |
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276 /// |
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277 /// let cwd = HgPath::new(b"other"); |
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278 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file")); |
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279 /// ``` |
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280 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> { |
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281 if cwd.as_ref().is_empty() { |
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282 Cow::Borrowed(path.as_bytes()) |
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283 } else { |
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284 let mut res: Vec<u8> = Vec::new(); |
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285 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable(); |
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286 let mut cwd_iter = |
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287 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable(); |
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288 loop { |
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289 match (path_iter.peek(), cwd_iter.peek()) { |
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290 (Some(a), Some(b)) if a == b => (), |
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291 _ => break, |
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292 } |
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293 path_iter.next(); |
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294 cwd_iter.next(); |
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295 } |
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296 let mut need_sep = false; |
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297 for _ in cwd_iter { |
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298 if need_sep { |
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299 res.extend(b"/") |
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300 } else { |
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301 need_sep = true |
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302 }; |
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303 res.extend(b".."); |
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304 } |
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305 for c in path_iter { |
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306 if need_sep { |
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307 res.extend(b"/") |
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308 } else { |
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309 need_sep = true |
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310 }; |
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311 res.extend(c); |
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312 } |
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313 Cow::Owned(res) |
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314 } |
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315 } |
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316 |
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317 #[cfg(test)] |
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318 mod tests { |
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319 use super::*; |
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320 use pretty_assertions::assert_eq; |
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321 |
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322 #[test] |
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323 fn find_dirs_some() { |
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324 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz")); |
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325 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar"))); |
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326 assert_eq!(dirs.next(), Some(HgPath::new(b"foo"))); |
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327 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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328 assert_eq!(dirs.next(), None); |
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329 assert_eq!(dirs.next(), None); |
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330 } |
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331 |
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332 #[test] |
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333 fn find_dirs_empty() { |
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334 // looks weird, but mercurial.pathutil.finddirs(b"") yields b"" |
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335 let mut dirs = super::find_dirs(HgPath::new(b"")); |
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336 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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337 assert_eq!(dirs.next(), None); |
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338 assert_eq!(dirs.next(), None); |
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339 } |
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340 |
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341 #[test] |
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342 fn test_find_dirs_with_base_some() { |
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343 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz")); |
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344 assert_eq!( |
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345 dirs.next(), |
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346 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz"))) |
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347 ); |
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348 assert_eq!( |
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349 dirs.next(), |
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350 Some((HgPath::new(b"foo"), HgPath::new(b"bar"))) |
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351 ); |
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352 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo")))); |
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353 assert_eq!(dirs.next(), None); |
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354 assert_eq!(dirs.next(), None); |
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355 } |
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356 |
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357 #[test] |
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358 fn test_find_dirs_with_base_empty() { |
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359 let mut dirs = super::find_dirs_with_base(HgPath::new(b"")); |
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360 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"")))); |
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361 assert_eq!(dirs.next(), None); |
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362 assert_eq!(dirs.next(), None); |
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363 } |
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364 |
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365 #[test] |
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366 fn test_canonical_path() { |
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367 let root = Path::new("/repo"); |
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368 let cwd = Path::new("/dir"); |
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369 let name = Path::new("filename"); |
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370 assert_eq!( |
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371 canonical_path(root, cwd, name), |
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372 Err(HgPathError::NotUnderRoot { |
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373 path: PathBuf::from("/dir/filename"), |
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374 root: root.to_path_buf() |
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375 }) |
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376 ); |
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377 |
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378 let root = Path::new("/repo"); |
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379 let cwd = Path::new("/"); |
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380 let name = Path::new("filename"); |
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381 assert_eq!( |
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382 canonical_path(root, cwd, name), |
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383 Err(HgPathError::NotUnderRoot { |
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384 path: PathBuf::from("/filename"), |
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385 root: root.to_path_buf() |
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386 }) |
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387 ); |
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388 |
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389 let root = Path::new("/repo"); |
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390 let cwd = Path::new("/"); |
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391 let name = Path::new("repo/filename"); |
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392 assert_eq!( |
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393 canonical_path(root, cwd, name), |
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394 Ok(PathBuf::from("filename")) |
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395 ); |
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396 |
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397 let root = Path::new("/repo"); |
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398 let cwd = Path::new("/repo"); |
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399 let name = Path::new("filename"); |
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400 assert_eq!( |
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401 canonical_path(root, cwd, name), |
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402 Ok(PathBuf::from("filename")) |
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403 ); |
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404 |
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405 let root = Path::new("/repo"); |
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406 let cwd = Path::new("/repo/subdir"); |
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407 let name = Path::new("filename"); |
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408 assert_eq!( |
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409 canonical_path(root, cwd, name), |
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410 Ok(PathBuf::from("subdir/filename")) |
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411 ); |
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412 } |
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413 |
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414 #[test] |
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415 fn test_canonical_path_not_rooted() { |
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416 use std::fs::create_dir; |
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417 use tempfile::tempdir; |
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418 |
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419 let base_dir = tempdir().unwrap(); |
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420 let base_dir_path = base_dir.path(); |
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421 let beneath_repo = base_dir_path.join("a"); |
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422 let root = base_dir_path.join("a/b"); |
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423 let out_of_repo = base_dir_path.join("c"); |
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424 let under_repo_symlink = out_of_repo.join("d"); |
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425 |
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426 create_dir(&beneath_repo).unwrap(); |
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427 create_dir(&root).unwrap(); |
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428 |
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429 // TODO make portable |
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430 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap(); |
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431 |
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432 assert_eq!( |
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433 canonical_path(&root, Path::new(""), out_of_repo), |
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434 Ok(PathBuf::from("")) |
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435 ); |
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436 assert_eq!( |
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437 canonical_path(&root, Path::new(""), &beneath_repo), |
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438 Err(HgPathError::NotUnderRoot { |
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439 path: beneath_repo.to_owned(), |
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440 root: root.to_owned() |
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441 }) |
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442 ); |
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443 assert_eq!( |
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444 canonical_path(&root, Path::new(""), &under_repo_symlink), |
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445 Ok(PathBuf::from("d")) |
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446 ); |
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447 } |
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448 } |