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annotate rust/hg-core/src/utils/files.rs @ 51864:db7dbe6f7bb2

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rust: add Vfs trait This will allow for the use of multiple vfs like in the Python implementation, as well as hiding the details of the upcoming Python vfs wrapper to hg-core.
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 19 Jun 2024 14:49:35 +0200
parents 529a655874fb
children b55f653a0b34
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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 pub fn dir_ancestors(path: &HgPath) -> Ancestors {
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124 Ancestors { next: Some(path) }
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125 }
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126
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127 /// Returns an iterator yielding ancestor directories of the given repository
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128 /// path.
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129 ///
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130 /// The path is separated by '/', and must not start with '/'.
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131 ///
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132 /// The path itself isn't included unless it is b"" (meaning the root
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133 /// directory.)
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134 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase {
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135 let mut dirs = AncestorsWithBase {
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136 next: Some((path, HgPath::new(b""))),
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137 };
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138 if !path.is_empty() {
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139 dirs.next(); // skip itself
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140 }
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141 dirs
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142 }
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143
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144 /// TODO more than ASCII?
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145 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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146 #[cfg(windows)] // NTFS compares via upper()
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147 return path.to_ascii_uppercase();
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148 #[cfg(unix)]
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149 path.to_ascii_lowercase()
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150 }
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151
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152 lazy_static! {
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153 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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154 [
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155 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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156 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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157 ]
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158 .iter()
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159 .map(|code| {
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160 std::char::from_u32(*code)
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161 .unwrap()
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162 .encode_utf8(&mut [0; 3])
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163 .bytes()
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164 .collect()
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165 })
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166 .collect()
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167 };
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168 }
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169
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170 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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171 let mut buf = bytes.to_owned();
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172 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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173 if needs_escaping {
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174 for forbidden in IGNORED_CHARS.iter() {
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175 replace_slice(&mut buf, forbidden, &[])
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176 }
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177 buf
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178 } else {
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179 buf
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180 }
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181 }
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182
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183 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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184 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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185 }
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186
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187 /// Returns the canonical path of `name`, given `cwd` and `root`
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188 pub fn canonical_path(
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189 root: impl AsRef<Path>,
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190 cwd: impl AsRef<Path>,
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191 name: impl AsRef<Path>,
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192 ) -> Result<PathBuf, HgPathError> {
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193 // TODO add missing normalization for other platforms
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194 let root = root.as_ref();
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195 let cwd = cwd.as_ref();
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196 let name = name.as_ref();
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197
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198 let name = if !name.is_absolute() {
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199 root.join(cwd).join(name)
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200 } else {
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201 name.to_owned()
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202 };
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203 let auditor = PathAuditor::new(root);
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204 if name != root && name.starts_with(root) {
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205 let name = name.strip_prefix(root).unwrap();
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206 auditor.audit_path(path_to_hg_path_buf(name)?)?;
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207 Ok(name.to_owned())
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208 } else if name == root {
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209 Ok("".into())
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210 } else {
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211 // Determine whether `name' is in the hierarchy at or beneath `root',
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212 // by iterating name=name.parent() until it returns `None` (can't
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213 // check name == '/', because that doesn't work on windows).
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214 let mut name = name.deref();
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215 let original_name = name.to_owned();
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216 loop {
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217 let same = is_same_file(name, root).unwrap_or(false);
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218 if same {
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219 if name == original_name {
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220 // `name` was actually the same as root (maybe a symlink)
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221 return Ok("".into());
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222 }
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223 // `name` is a symlink to root, so `original_name` is under
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224 // root
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225 let rel_path = original_name.strip_prefix(name).unwrap();
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226 auditor.audit_path(path_to_hg_path_buf(rel_path)?)?;
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227 return Ok(rel_path.to_owned());
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228 }
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229 name = match name.parent() {
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230 None => break,
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231 Some(p) => p,
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232 };
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233 }
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234 // TODO hint to the user about using --cwd
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235 // Bubble up the responsibility to Python for now
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236 Err(HgPathError::NotUnderRoot {
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237 path: original_name,
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238 root: root.to_owned(),
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239 })
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240 }
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241 }
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242
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243 /// Returns the representation of the path relative to the current working
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244 /// directory for display purposes.
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245 ///
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246 /// `cwd` is a `HgPath`, so it is considered relative to the root directory
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247 /// of the repository.
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248 ///
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249 /// # Examples
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250 ///
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251 /// ```
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252 /// use hg::utils::hg_path::HgPath;
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253 /// use hg::utils::files::relativize_path;
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254 /// use std::borrow::Cow;
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255 ///
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256 /// let file = HgPath::new(b"nested/file");
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257 /// let cwd = HgPath::new(b"");
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258 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file"));
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259 ///
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260 /// let cwd = HgPath::new(b"nested");
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261 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file"));
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262 ///
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263 /// let cwd = HgPath::new(b"other");
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264 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file"));
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265 /// ```
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266 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> {
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267 if cwd.as_ref().is_empty() {
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268 Cow::Borrowed(path.as_bytes())
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269 } else {
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270 // This is not all accurate as to how large `res` will actually be, but
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271 // profiling `rhg files` on a large-ish repo shows it’s better than
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272 // starting from a zero-capacity `Vec` and letting `extend` reallocate
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273 // repeatedly.
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274 let guesstimate = path.as_bytes().len();
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275
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276 let mut res: Vec<u8> = Vec::with_capacity(guesstimate);
45436
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277 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable();
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278 let mut cwd_iter =
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279 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable();
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280 loop {
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281 match (path_iter.peek(), cwd_iter.peek()) {
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282 (Some(a), Some(b)) if a == b => (),
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283 _ => break,
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284 }
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285 path_iter.next();
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286 cwd_iter.next();
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287 }
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288 let mut need_sep = false;
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289 for _ in cwd_iter {
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290 if need_sep {
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291 res.extend(b"/")
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292 } else {
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293 need_sep = true
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294 };
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295 res.extend(b"..");
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296 }
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297 for c in path_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(c);
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304 }
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305 Cow::Owned(res)
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306 }
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307 }
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308
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309 #[cfg(test)]
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310 mod tests {
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311 use super::*;
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312 use pretty_assertions::assert_eq;
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313
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314 #[test]
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315 fn find_dirs_some() {
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316 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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317 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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318 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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319 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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320 assert_eq!(dirs.next(), None);
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321 assert_eq!(dirs.next(), None);
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322 }
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323
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324 #[test]
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325 fn find_dirs_empty() {
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326 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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327 let mut dirs = super::find_dirs(HgPath::new(b""));
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328 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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329 assert_eq!(dirs.next(), None);
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330 assert_eq!(dirs.next(), None);
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331 }
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332
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333 #[test]
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334 fn test_find_dirs_with_base_some() {
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335 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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336 assert_eq!(
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337 dirs.next(),
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338 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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339 );
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340 assert_eq!(
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341 dirs.next(),
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342 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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343 );
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344 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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345 assert_eq!(dirs.next(), None);
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346 assert_eq!(dirs.next(), None);
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347 }
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348
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349 #[test]
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350 fn test_find_dirs_with_base_empty() {
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351 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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352 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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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_canonical_path() {
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359 let root = Path::new("/repo");
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360 let cwd = Path::new("/dir");
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361 let name = Path::new("filename");
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362 assert_eq!(
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363 canonical_path(root, cwd, name),
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364 Err(HgPathError::NotUnderRoot {
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365 path: PathBuf::from("/dir/filename"),
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366 root: root.to_path_buf()
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367 })
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368 );
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369
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370 let root = Path::new("/repo");
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371 let cwd = Path::new("/");
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372 let name = Path::new("filename");
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373 assert_eq!(
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374 canonical_path(root, cwd, name),
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375 Err(HgPathError::NotUnderRoot {
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376 path: PathBuf::from("/filename"),
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377 root: root.to_path_buf()
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378 })
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379 );
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380
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381 let root = Path::new("/repo");
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382 let cwd = Path::new("/");
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383 let name = Path::new("repo/filename");
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384 assert_eq!(
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385 canonical_path(root, cwd, name),
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386 Ok(PathBuf::from("filename"))
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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("/repo");
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391 let name = Path::new("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/subdir");
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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("subdir/filename"))
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403 );
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404 }
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405
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406 #[test]
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407 fn test_canonical_path_not_rooted() {
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408 use std::fs::create_dir;
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409 use tempfile::tempdir;
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410
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411 let base_dir = tempdir().unwrap();
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412 let base_dir_path = base_dir.path();
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413 let beneath_repo = base_dir_path.join("a");
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414 let root = base_dir_path.join("a/b");
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415 let out_of_repo = base_dir_path.join("c");
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416 let under_repo_symlink = out_of_repo.join("d");
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417
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418 create_dir(&beneath_repo).unwrap();
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419 create_dir(&root).unwrap();
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420
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421 // TODO make portable
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422 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap();
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423
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424 assert_eq!(
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425 canonical_path(&root, Path::new(""), out_of_repo),
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426 Ok(PathBuf::from(""))
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427 );
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428 assert_eq!(
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429 canonical_path(&root, Path::new(""), &beneath_repo),
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diff changeset
430 Err(HgPathError::NotUnderRoot {
49930
e98fd81bb151 rust-clippy: fix most warnings in `hg-core`
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431 path: beneath_repo,
44301
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432 root: root.to_owned()
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433 })
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434 );
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diff changeset
435 assert_eq!(
51117
532e74ad3ff6 rust: run a clippy pass with the latest stable version
Rapha?l Gom?s <rgomes@octobus.net>
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436 canonical_path(&root, Path::new(""), under_repo_symlink),
44301
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437 Ok(PathBuf::from("d"))
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438 );
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439 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
Yuya Nishihara <yuya@tcha.org>
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440 }