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annotate rust/hg-core/src/utils/files.rs @ 46444:6c778d20c8c2

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rust: replace ToString impls with Display ToString is automatically implementing for everything that implements Display, and Display can avoid allocating intermediate strings. Differential Revision: https://phab.mercurial-scm.org/D9904
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 28 Jan 2021 19:21:57 +0100
parents 95d6f31e88db
children 0d734c0ae1cf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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::fs::Metadata;
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21 use std::io::Read;
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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 use std::os::unix::ffi::OsStrExt;
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45 path.as_ref().as_os_str().as_bytes().to_vec()
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46 }
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47
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48 /// An iterator over repository path yielding itself and its ancestors.
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49 #[derive(Copy, Clone, Debug)]
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50 pub struct Ancestors<'a> {
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51 next: Option<&'a HgPath>,
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52 }
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53
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54 impl<'a> Iterator for Ancestors<'a> {
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55 type Item = &'a HgPath;
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56
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57 fn next(&mut self) -> Option<Self::Item> {
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58 let next = self.next;
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59 self.next = match self.next {
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60 Some(s) if s.is_empty() => None,
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61 Some(s) => {
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62 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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63 Some(HgPath::new(&s.as_bytes()[..p]))
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64 }
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65 None => None,
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66 };
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67 next
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68 }
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69 }
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70
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71 impl<'a> FusedIterator for Ancestors<'a> {}
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72
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73 /// An iterator over repository path yielding itself and its ancestors.
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74 #[derive(Copy, Clone, Debug)]
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75 pub(crate) struct AncestorsWithBase<'a> {
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76 next: Option<(&'a HgPath, &'a HgPath)>,
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77 }
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78
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79 impl<'a> Iterator for AncestorsWithBase<'a> {
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80 type Item = (&'a HgPath, &'a HgPath);
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81
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82 fn next(&mut self) -> Option<Self::Item> {
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83 let next = self.next;
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84 self.next = match self.next {
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85 Some((s, _)) if s.is_empty() => None,
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86 Some((s, _)) => Some(s.split_filename()),
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87 None => None,
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88 };
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89 next
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90 }
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91 }
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92
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93 impl<'a> FusedIterator for AncestorsWithBase<'a> {}
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94
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95 /// Returns an iterator yielding ancestor directories of the given repository
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96 /// path.
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97 ///
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98 /// The path is separated by '/', and must not start with '/'.
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99 ///
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100 /// The path itself isn't included unless it is b"" (meaning the root
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101 /// directory.)
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102 pub fn find_dirs(path: &HgPath) -> Ancestors {
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103 let mut dirs = Ancestors { next: Some(path) };
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104 if !path.is_empty() {
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105 dirs.next(); // skip itself
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106 }
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107 dirs
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108 }
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109
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110 /// Returns an iterator yielding ancestor directories of the given repository
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111 /// path.
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112 ///
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113 /// The path is separated by '/', and must not start with '/'.
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114 ///
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115 /// The path itself isn't included unless it is b"" (meaning the root
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116 /// directory.)
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117 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase {
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118 let mut dirs = AncestorsWithBase {
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119 next: Some((path, HgPath::new(b""))),
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120 };
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121 if !path.is_empty() {
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122 dirs.next(); // skip itself
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123 }
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124 dirs
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125 }
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126
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127 /// TODO more than ASCII?
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128 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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129 #[cfg(windows)] // NTFS compares via upper()
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130 return path.to_ascii_uppercase();
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131 #[cfg(unix)]
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132 path.to_ascii_lowercase()
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133 }
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134
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135 lazy_static! {
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136 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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137 [
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138 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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139 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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140 ]
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141 .iter()
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142 .map(|code| {
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143 std::char::from_u32(*code)
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144 .unwrap()
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145 .encode_utf8(&mut [0; 3])
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146 .bytes()
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147 .collect()
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148 })
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149 .collect()
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150 };
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151 }
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152
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153 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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154 let mut buf = bytes.to_owned();
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155 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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156 if needs_escaping {
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157 for forbidden in IGNORED_CHARS.iter() {
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158 replace_slice(&mut buf, forbidden, &[])
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159 }
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160 buf
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161 } else {
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162 buf
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163 }
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164 }
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165
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166 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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167 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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168 }
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169
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170 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
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171 pub struct HgMetadata {
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172 pub st_dev: u64,
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173 pub st_mode: u32,
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174 pub st_nlink: u64,
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175 pub st_size: u64,
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176 pub st_mtime: i64,
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177 pub st_ctime: i64,
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178 }
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179
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180 // TODO support other plaforms
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181 #[cfg(unix)]
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182 impl HgMetadata {
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183 pub fn from_metadata(metadata: Metadata) -> Self {
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184 use std::os::unix::fs::MetadataExt;
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185 Self {
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186 st_dev: metadata.dev(),
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187 st_mode: metadata.mode(),
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188 st_nlink: metadata.nlink(),
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189 st_size: metadata.size(),
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190 st_mtime: metadata.mtime(),
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191 st_ctime: metadata.ctime(),
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192 }
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193 }
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194 }
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195
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196 /// Returns the canonical path of `name`, given `cwd` and `root`
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197 pub fn canonical_path(
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198 root: impl AsRef<Path>,
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199 cwd: impl AsRef<Path>,
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200 name: impl AsRef<Path>,
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201 ) -> Result<PathBuf, HgPathError> {
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202 // TODO add missing normalization for other platforms
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203 let root = root.as_ref();
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204 let cwd = cwd.as_ref();
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205 let name = name.as_ref();
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206
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207 let name = if !name.is_absolute() {
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208 root.join(&cwd).join(&name)
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209 } else {
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210 name.to_owned()
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211 };
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212 let auditor = PathAuditor::new(&root);
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213 if name != root && name.starts_with(&root) {
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214 let name = name.strip_prefix(&root).unwrap();
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215 auditor.audit_path(path_to_hg_path_buf(name)?)?;
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216 Ok(name.to_owned())
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217 } else if name == root {
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218 Ok("".into())
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219 } else {
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220 // Determine whether `name' is in the hierarchy at or beneath `root',
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221 // by iterating name=name.parent() until it returns `None` (can't
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222 // check name == '/', because that doesn't work on windows).
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223 let mut name = name.deref();
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224 let original_name = name.to_owned();
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225 loop {
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226 let same = is_same_file(&name, &root).unwrap_or(false);
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227 if same {
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228 if name == original_name {
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229 // `name` was actually the same as root (maybe a symlink)
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230 return Ok("".into());
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231 }
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232 // `name` is a symlink to root, so `original_name` is under
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233 // root
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234 let rel_path = original_name.strip_prefix(&name).unwrap();
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235 auditor.audit_path(path_to_hg_path_buf(&rel_path)?)?;
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236 return Ok(rel_path.to_owned());
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237 }
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238 name = match name.parent() {
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239 None => break,
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240 Some(p) => p,
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241 };
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242 }
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243 // TODO hint to the user about using --cwd
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244 // Bubble up the responsibility to Python for now
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245 Err(HgPathError::NotUnderRoot {
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246 path: original_name.to_owned(),
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247 root: root.to_owned(),
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248 })
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249 }
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250 }
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251
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252 /// Returns the representation of the path relative to the current working
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253 /// directory for display purposes.
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254 ///
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255 /// `cwd` is a `HgPath`, so it is considered relative to the root directory
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256 /// of the repository.
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257 ///
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258 /// # Examples
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259 ///
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260 /// ```
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261 /// use hg::utils::hg_path::HgPath;
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262 /// use hg::utils::files::relativize_path;
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263 /// use std::borrow::Cow;
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264 ///
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265 /// let file = HgPath::new(b"nested/file");
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266 /// let cwd = HgPath::new(b"");
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267 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file"));
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268 ///
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269 /// let cwd = HgPath::new(b"nested");
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270 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file"));
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271 ///
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272 /// let cwd = HgPath::new(b"other");
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273 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file"));
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274 /// ```
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275 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> {
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276 if cwd.as_ref().is_empty() {
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277 Cow::Borrowed(path.as_bytes())
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278 } else {
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279 let mut res: Vec<u8> = Vec::new();
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280 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable();
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281 let mut cwd_iter =
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282 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable();
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283 loop {
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284 match (path_iter.peek(), cwd_iter.peek()) {
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285 (Some(a), Some(b)) if a == b => (),
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286 _ => break,
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287 }
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288 path_iter.next();
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289 cwd_iter.next();
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290 }
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291 let mut need_sep = false;
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292 for _ in cwd_iter {
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293 if need_sep {
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294 res.extend(b"/")
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295 } else {
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296 need_sep = true
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297 };
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298 res.extend(b"..");
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299 }
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300 for c in path_iter {
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301 if need_sep {
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302 res.extend(b"/")
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303 } else {
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304 need_sep = true
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305 };
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306 res.extend(c);
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307 }
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308 Cow::Owned(res)
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309 }
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310 }
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311
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312 /// Reads a file in one big chunk instead of doing multiple reads
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313 pub fn read_whole_file(filepath: &Path) -> std::io::Result<Vec<u8>> {
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314 let mut file = std::fs::File::open(filepath)?;
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315 let size = file.metadata()?.len();
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316
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317 let mut res = vec![0; size as usize];
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318 file.read_exact(&mut res)?;
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319
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320 Ok(res)
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321 }
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322
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323 #[cfg(test)]
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324 mod tests {
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325 use super::*;
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326 use pretty_assertions::assert_eq;
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327
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328 #[test]
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329 fn find_dirs_some() {
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330 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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331 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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332 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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333 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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334 assert_eq!(dirs.next(), None);
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335 assert_eq!(dirs.next(), None);
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336 }
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337
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338 #[test]
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339 fn find_dirs_empty() {
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340 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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341 let mut dirs = super::find_dirs(HgPath::new(b""));
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342 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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343 assert_eq!(dirs.next(), None);
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344 assert_eq!(dirs.next(), None);
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345 }
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346
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347 #[test]
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348 fn test_find_dirs_with_base_some() {
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349 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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350 assert_eq!(
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351 dirs.next(),
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352 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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353 );
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354 assert_eq!(
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355 dirs.next(),
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356 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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357 );
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358 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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359 assert_eq!(dirs.next(), None);
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360 assert_eq!(dirs.next(), None);
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361 }
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362
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363 #[test]
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364 fn test_find_dirs_with_base_empty() {
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365 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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366 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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367 assert_eq!(dirs.next(), None);
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368 assert_eq!(dirs.next(), None);
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369 }
44301
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370
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371 #[test]
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372 fn test_canonical_path() {
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373 let root = Path::new("/repo");
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374 let cwd = Path::new("/dir");
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375 let name = Path::new("filename");
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376 assert_eq!(
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377 canonical_path(root, cwd, name),
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diff changeset
378 Err(HgPathError::NotUnderRoot {
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379 path: PathBuf::from("/dir/filename"),
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380 root: root.to_path_buf()
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381 })
4caac36c66bc rust-utils: add util for canonical path
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382 );
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383
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384 let root = Path::new("/repo");
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385 let cwd = Path::new("/");
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386 let name = Path::new("filename");
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387 assert_eq!(
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388 canonical_path(root, cwd, name),
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diff changeset
389 Err(HgPathError::NotUnderRoot {
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390 path: PathBuf::from("/filename"),
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391 root: root.to_path_buf()
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392 })
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393 );
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394
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395 let root = Path::new("/repo");
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396 let cwd = Path::new("/");
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397 let name = Path::new("repo/filename");
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398 assert_eq!(
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399 canonical_path(root, cwd, name),
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400 Ok(PathBuf::from("filename"))
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401 );
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402
4caac36c66bc rust-utils: add util for canonical path
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403 let root = Path::new("/repo");
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404 let cwd = Path::new("/repo");
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405 let name = Path::new("filename");
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406 assert_eq!(
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407 canonical_path(root, cwd, name),
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diff changeset
408 Ok(PathBuf::from("filename"))
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diff changeset
409 );
4caac36c66bc rust-utils: add util for canonical path
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410
4caac36c66bc rust-utils: add util for canonical path
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411 let root = Path::new("/repo");
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412 let cwd = Path::new("/repo/subdir");
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413 let name = Path::new("filename");
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414 assert_eq!(
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415 canonical_path(root, cwd, name),
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416 Ok(PathBuf::from("subdir/filename"))
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417 );
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418 }
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419
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420 #[test]
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421 fn test_canonical_path_not_rooted() {
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422 use std::fs::create_dir;
4caac36c66bc rust-utils: add util for canonical path
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423 use tempfile::tempdir;
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424
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425 let base_dir = tempdir().unwrap();
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426 let base_dir_path = base_dir.path();
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427 let beneath_repo = base_dir_path.join("a");
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diff changeset
428 let root = base_dir_path.join("a/b");
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429 let out_of_repo = base_dir_path.join("c");
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430 let under_repo_symlink = out_of_repo.join("d");
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431
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432 create_dir(&beneath_repo).unwrap();
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diff changeset
433 create_dir(&root).unwrap();
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
434
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
435 // TODO make portable
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diff changeset
436 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap();
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
437
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
438 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
439 canonical_path(&root, Path::new(""), out_of_repo),
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
440 Ok(PathBuf::from(""))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
441 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
442 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
443 canonical_path(&root, Path::new(""), &beneath_repo),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
444 Err(HgPathError::NotUnderRoot {
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
445 path: beneath_repo.to_owned(),
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
446 root: root.to_owned()
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
447 })
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
448 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
449 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
450 canonical_path(&root, Path::new(""), &under_repo_symlink),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
451 Ok(PathBuf::from("d"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
452 );
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
453 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
Yuya Nishihara <yuya@tcha.org>
parents: 42484
diff changeset
454 }