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annotate rust/hg-core/src/utils/files.rs @ 50774:5a8b54201039 stable 6.5.2

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relnotes: add 6.5.2
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 06 Sep 2023 18:10:44 +0200
parents e98fd81bb151
children 532e74ad3ff6
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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, OsString};
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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_os_str_from_bytes(bytes: &[u8]) -> &OsStr {
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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 os_str
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36 }
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37
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38 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
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39 Path::new(get_os_str_from_bytes(bytes))
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40 }
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41
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42 // TODO: need to convert from WTF8 to MBCS bytes on Windows.
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43 // that's why Vec<u8> is returned.
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44 #[cfg(unix)]
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45 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> {
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46 get_bytes_from_os_str(path.as_ref())
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47 }
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48
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49 #[cfg(unix)]
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50 pub fn get_bytes_from_os_str(str: impl AsRef<OsStr>) -> Vec<u8> {
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51 use std::os::unix::ffi::OsStrExt;
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52 str.as_ref().as_bytes().to_vec()
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53 }
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54
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55 #[cfg(unix)]
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56 pub fn get_bytes_from_os_string(str: OsString) -> Vec<u8> {
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57 use std::os::unix::ffi::OsStringExt;
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58 str.into_vec()
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59 }
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60
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61 /// An iterator over repository path yielding itself and its ancestors.
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62 #[derive(Copy, Clone, Debug)]
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63 pub struct Ancestors<'a> {
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64 next: Option<&'a HgPath>,
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65 }
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66
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67 impl<'a> Iterator for Ancestors<'a> {
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68 type Item = &'a HgPath;
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69
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70 fn next(&mut self) -> Option<Self::Item> {
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71 let next = self.next;
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72 self.next = match self.next {
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73 Some(s) if s.is_empty() => None,
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74 Some(s) => {
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75 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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76 Some(HgPath::new(&s.as_bytes()[..p]))
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77 }
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78 None => None,
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79 };
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80 next
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81 }
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82 }
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83
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84 impl<'a> FusedIterator for Ancestors<'a> {}
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85
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86 /// An iterator over repository path yielding itself and its ancestors.
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87 #[derive(Copy, Clone, Debug)]
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88 pub(crate) struct AncestorsWithBase<'a> {
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89 next: Option<(&'a HgPath, &'a HgPath)>,
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90 }
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91
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92 impl<'a> Iterator for AncestorsWithBase<'a> {
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93 type Item = (&'a HgPath, &'a HgPath);
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94
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95 fn next(&mut self) -> Option<Self::Item> {
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96 let next = self.next;
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97 self.next = match self.next {
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98 Some((s, _)) if s.is_empty() => None,
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99 Some((s, _)) => Some(s.split_filename()),
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100 None => None,
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101 };
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102 next
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103 }
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104 }
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105
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106 impl<'a> FusedIterator for AncestorsWithBase<'a> {}
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107
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108 /// Returns an iterator yielding ancestor directories of the given repository
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109 /// path.
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110 ///
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111 /// The path is separated by '/', and must not start with '/'.
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112 ///
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113 /// The path itself isn't included unless it is b"" (meaning the root
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114 /// directory.)
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115 pub fn find_dirs(path: &HgPath) -> Ancestors {
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116 let mut dirs = Ancestors { next: Some(path) };
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117 if !path.is_empty() {
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118 dirs.next(); // skip itself
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119 }
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120 dirs
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121 }
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122
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123 /// Returns an iterator yielding ancestor directories of the given repository
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124 /// path.
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125 ///
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126 /// The path is separated by '/', and must not start with '/'.
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127 ///
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128 /// The path itself isn't included unless it is b"" (meaning the root
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129 /// directory.)
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130 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase {
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131 let mut dirs = AncestorsWithBase {
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132 next: Some((path, HgPath::new(b""))),
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133 };
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134 if !path.is_empty() {
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135 dirs.next(); // skip itself
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136 }
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137 dirs
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138 }
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139
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140 /// TODO more than ASCII?
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141 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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142 #[cfg(windows)] // NTFS compares via upper()
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143 return path.to_ascii_uppercase();
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144 #[cfg(unix)]
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145 path.to_ascii_lowercase()
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146 }
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147
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148 lazy_static! {
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149 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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150 [
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151 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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152 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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153 ]
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154 .iter()
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155 .map(|code| {
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156 std::char::from_u32(*code)
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157 .unwrap()
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158 .encode_utf8(&mut [0; 3])
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159 .bytes()
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160 .collect()
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161 })
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162 .collect()
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163 };
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164 }
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165
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166 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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167 let mut buf = bytes.to_owned();
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168 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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169 if needs_escaping {
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170 for forbidden in IGNORED_CHARS.iter() {
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171 replace_slice(&mut buf, forbidden, &[])
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172 }
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173 buf
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174 } else {
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175 buf
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176 }
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177 }
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178
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179 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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180 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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181 }
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182
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183 /// Returns the canonical path of `name`, given `cwd` and `root`
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184 pub fn canonical_path(
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185 root: impl AsRef<Path>,
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186 cwd: impl AsRef<Path>,
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187 name: impl AsRef<Path>,
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188 ) -> Result<PathBuf, HgPathError> {
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189 // TODO add missing normalization for other platforms
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190 let root = root.as_ref();
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191 let cwd = cwd.as_ref();
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192 let name = name.as_ref();
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193
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194 let name = if !name.is_absolute() {
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195 root.join(&cwd).join(&name)
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196 } else {
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197 name.to_owned()
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198 };
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199 let auditor = PathAuditor::new(&root);
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200 if name != root && name.starts_with(&root) {
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201 let name = name.strip_prefix(&root).unwrap();
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202 auditor.audit_path(path_to_hg_path_buf(name)?)?;
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203 Ok(name.to_owned())
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204 } else if name == root {
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205 Ok("".into())
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206 } else {
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207 // Determine whether `name' is in the hierarchy at or beneath `root',
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208 // by iterating name=name.parent() until it returns `None` (can't
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209 // check name == '/', because that doesn't work on windows).
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210 let mut name = name.deref();
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211 let original_name = name.to_owned();
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212 loop {
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213 let same = is_same_file(&name, &root).unwrap_or(false);
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214 if same {
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215 if name == original_name {
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216 // `name` was actually the same as root (maybe a symlink)
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217 return Ok("".into());
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218 }
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219 // `name` is a symlink to root, so `original_name` is under
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220 // root
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221 let rel_path = original_name.strip_prefix(&name).unwrap();
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222 auditor.audit_path(path_to_hg_path_buf(&rel_path)?)?;
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223 return Ok(rel_path.to_owned());
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224 }
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225 name = match name.parent() {
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226 None => break,
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227 Some(p) => p,
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228 };
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229 }
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230 // TODO hint to the user about using --cwd
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231 // Bubble up the responsibility to Python for now
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232 Err(HgPathError::NotUnderRoot {
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233 path: original_name,
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234 root: root.to_owned(),
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235 })
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236 }
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237 }
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238
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239 /// Returns the representation of the path relative to the current working
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240 /// directory for display purposes.
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241 ///
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242 /// `cwd` is a `HgPath`, so it is considered relative to the root directory
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243 /// of the repository.
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244 ///
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245 /// # Examples
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246 ///
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247 /// ```
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248 /// use hg::utils::hg_path::HgPath;
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249 /// use hg::utils::files::relativize_path;
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250 /// use std::borrow::Cow;
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251 ///
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252 /// let file = HgPath::new(b"nested/file");
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253 /// let cwd = HgPath::new(b"");
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254 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file"));
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255 ///
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256 /// let cwd = HgPath::new(b"nested");
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257 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file"));
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258 ///
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259 /// let cwd = HgPath::new(b"other");
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260 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file"));
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261 /// ```
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262 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> {
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263 if cwd.as_ref().is_empty() {
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264 Cow::Borrowed(path.as_bytes())
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265 } else {
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266 // This is not all accurate as to how large `res` will actually be, but
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267 // profiling `rhg files` on a large-ish repo shows it’s better than
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268 // starting from a zero-capacity `Vec` and letting `extend` reallocate
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269 // repeatedly.
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270 let guesstimate = path.as_bytes().len();
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271
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272 let mut res: Vec<u8> = Vec::with_capacity(guesstimate);
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273 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable();
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274 let mut cwd_iter =
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275 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable();
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276 loop {
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277 match (path_iter.peek(), cwd_iter.peek()) {
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278 (Some(a), Some(b)) if a == b => (),
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279 _ => break,
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280 }
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281 path_iter.next();
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282 cwd_iter.next();
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283 }
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284 let mut need_sep = false;
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285 for _ in cwd_iter {
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286 if need_sep {
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287 res.extend(b"/")
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288 } else {
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289 need_sep = true
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290 };
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291 res.extend(b"..");
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292 }
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293 for c in path_iter {
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294 if need_sep {
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295 res.extend(b"/")
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296 } else {
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297 need_sep = true
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298 };
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299 res.extend(c);
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300 }
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301 Cow::Owned(res)
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302 }
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303 }
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304
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305 #[cfg(test)]
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306 mod tests {
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307 use super::*;
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308 use pretty_assertions::assert_eq;
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309
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310 #[test]
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311 fn find_dirs_some() {
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312 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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313 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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314 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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315 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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316 assert_eq!(dirs.next(), None);
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317 assert_eq!(dirs.next(), None);
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318 }
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319
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320 #[test]
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321 fn find_dirs_empty() {
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322 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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323 let mut dirs = super::find_dirs(HgPath::new(b""));
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324 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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325 assert_eq!(dirs.next(), None);
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326 assert_eq!(dirs.next(), None);
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327 }
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328
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329 #[test]
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330 fn test_find_dirs_with_base_some() {
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331 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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332 assert_eq!(
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333 dirs.next(),
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334 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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335 );
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336 assert_eq!(
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337 dirs.next(),
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338 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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339 );
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340 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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341 assert_eq!(dirs.next(), None);
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342 assert_eq!(dirs.next(), None);
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343 }
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344
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345 #[test]
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346 fn test_find_dirs_with_base_empty() {
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347 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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348 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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349 assert_eq!(dirs.next(), None);
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350 assert_eq!(dirs.next(), None);
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351 }
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352
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353 #[test]
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354 fn test_canonical_path() {
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355 let root = Path::new("/repo");
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356 let cwd = Path::new("/dir");
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357 let name = Path::new("filename");
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358 assert_eq!(
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359 canonical_path(root, cwd, name),
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360 Err(HgPathError::NotUnderRoot {
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361 path: PathBuf::from("/dir/filename"),
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362 root: root.to_path_buf()
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363 })
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364 );
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365
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366 let root = Path::new("/repo");
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367 let cwd = Path::new("/");
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368 let name = Path::new("filename");
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369 assert_eq!(
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370 canonical_path(root, cwd, name),
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371 Err(HgPathError::NotUnderRoot {
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372 path: PathBuf::from("/filename"),
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373 root: root.to_path_buf()
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374 })
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375 );
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376
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377 let root = Path::new("/repo");
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378 let cwd = Path::new("/");
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379 let name = Path::new("repo/filename");
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380 assert_eq!(
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381 canonical_path(root, cwd, name),
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382 Ok(PathBuf::from("filename"))
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383 );
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384
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385 let root = Path::new("/repo");
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386 let cwd = Path::new("/repo");
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387 let name = Path::new("filename");
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388 assert_eq!(
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389 canonical_path(root, cwd, name),
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390 Ok(PathBuf::from("filename"))
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391 );
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392
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393 let root = Path::new("/repo");
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394 let cwd = Path::new("/repo/subdir");
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395 let name = Path::new("filename");
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396 assert_eq!(
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397 canonical_path(root, cwd, name),
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398 Ok(PathBuf::from("subdir/filename"))
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399 );
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400 }
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401
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402 #[test]
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403 fn test_canonical_path_not_rooted() {
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404 use std::fs::create_dir;
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405 use tempfile::tempdir;
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406
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407 let base_dir = tempdir().unwrap();
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408 let base_dir_path = base_dir.path();
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409 let beneath_repo = base_dir_path.join("a");
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410 let root = base_dir_path.join("a/b");
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411 let out_of_repo = base_dir_path.join("c");
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412 let under_repo_symlink = out_of_repo.join("d");
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413
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414 create_dir(&beneath_repo).unwrap();
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415 create_dir(&root).unwrap();
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416
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417 // TODO make portable
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418 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap();
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419
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420 assert_eq!(
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421 canonical_path(&root, Path::new(""), out_of_repo),
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422 Ok(PathBuf::from(""))
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423 );
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424 assert_eq!(
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425 canonical_path(&root, Path::new(""), &beneath_repo),
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426 Err(HgPathError::NotUnderRoot {
50003
e98fd81bb151 rust-clippy: fix most warnings in `hg-core`
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427 path: beneath_repo,
44345
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428 root: root.to_owned()
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429 })
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430 );
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431 assert_eq!(
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432 canonical_path(&root, Path::new(""), &under_repo_symlink),
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433 Ok(PathBuf::from("d"))
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434 );
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435 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
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436 }