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annotate rust/hg-core/src/utils/files.rs @ 52043:e1fe336c007a

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rust-repo: don't use on-disk dirstate parents in v1 This mistake was not causing any problems yet since we were never updating parents from Rust code. This is about to change, so let's fix it.
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 02 Oct 2024 13:36:51 +0200
parents b55f653a0b34
children 66e34bc44280
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::ffi::{OsStr, OsString};
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20 use std::iter::FusedIterator;
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21 use std::ops::Deref;
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22 use std::path::{Path, PathBuf};
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23 use std::{
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24 borrow::{Cow, ToOwned},
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25 io,
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26 time::SystemTime,
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27 };
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28
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29 pub fn get_os_str_from_bytes(bytes: &[u8]) -> &OsStr {
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30 let os_str;
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31 #[cfg(unix)]
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32 {
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33 use std::os::unix::ffi::OsStrExt;
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34 os_str = std::ffi::OsStr::from_bytes(bytes);
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35 }
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36 // TODO Handle other platforms
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37 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
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38 // Perhaps, the return type would have to be Result<PathBuf>.
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39 os_str
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40 }
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41
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42 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
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43 Path::new(get_os_str_from_bytes(bytes))
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44 }
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45
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46 // TODO: need to convert from WTF8 to MBCS bytes on Windows.
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47 // that's why Vec<u8> is returned.
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48 #[cfg(unix)]
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49 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> {
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50 get_bytes_from_os_str(path.as_ref())
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51 }
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52
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53 #[cfg(unix)]
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54 pub fn get_bytes_from_os_str(str: impl AsRef<OsStr>) -> Vec<u8> {
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55 use std::os::unix::ffi::OsStrExt;
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56 str.as_ref().as_bytes().to_vec()
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57 }
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58
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59 #[cfg(unix)]
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60 pub fn get_bytes_from_os_string(str: OsString) -> Vec<u8> {
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61 use std::os::unix::ffi::OsStringExt;
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62 str.into_vec()
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63 }
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64
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65 /// An iterator over repository path yielding itself and its ancestors.
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66 #[derive(Copy, Clone, Debug)]
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67 pub struct Ancestors<'a> {
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68 next: Option<&'a HgPath>,
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69 }
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70
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71 impl<'a> Iterator for Ancestors<'a> {
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72 type Item = &'a HgPath;
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73
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74 fn next(&mut self) -> Option<Self::Item> {
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75 let next = self.next;
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76 self.next = match self.next {
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77 Some(s) if s.is_empty() => None,
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78 Some(s) => {
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79 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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80 Some(HgPath::new(&s.as_bytes()[..p]))
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81 }
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82 None => None,
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83 };
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84 next
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85 }
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86 }
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87
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88 impl<'a> FusedIterator for Ancestors<'a> {}
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89
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90 /// An iterator over repository path yielding itself and its ancestors.
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91 #[derive(Copy, Clone, Debug)]
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92 pub(crate) struct AncestorsWithBase<'a> {
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93 next: Option<(&'a HgPath, &'a HgPath)>,
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94 }
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95
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96 impl<'a> Iterator for AncestorsWithBase<'a> {
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97 type Item = (&'a HgPath, &'a HgPath);
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98
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99 fn next(&mut self) -> Option<Self::Item> {
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100 let next = self.next;
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101 self.next = match self.next {
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102 Some((s, _)) if s.is_empty() => None,
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103 Some((s, _)) => Some(s.split_filename()),
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104 None => None,
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105 };
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106 next
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107 }
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108 }
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109
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110 impl<'a> FusedIterator for AncestorsWithBase<'a> {}
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111
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112 /// Returns an iterator yielding ancestor directories of the given repository
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113 /// path.
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114 ///
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115 /// The path is separated by '/', and must not start with '/'.
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116 ///
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117 /// The path itself isn't included unless it is b"" (meaning the root
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118 /// directory.)
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119 pub fn find_dirs(path: &HgPath) -> Ancestors {
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120 let mut dirs = Ancestors { next: Some(path) };
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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 pub fn dir_ancestors(path: &HgPath) -> Ancestors {
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128 Ancestors { next: Some(path) }
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129 }
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130
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131 /// Returns an iterator yielding ancestor directories of the given repository
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132 /// path.
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133 ///
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134 /// The path is separated by '/', and must not start with '/'.
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135 ///
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136 /// The path itself isn't included unless it is b"" (meaning the root
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137 /// directory.)
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138 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase {
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139 let mut dirs = AncestorsWithBase {
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140 next: Some((path, HgPath::new(b""))),
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141 };
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142 if !path.is_empty() {
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143 dirs.next(); // skip itself
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144 }
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145 dirs
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146 }
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147
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148 /// TODO more than ASCII?
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149 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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150 #[cfg(windows)] // NTFS compares via upper()
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151 return path.to_ascii_uppercase();
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152 #[cfg(unix)]
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153 path.to_ascii_lowercase()
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154 }
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155
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156 lazy_static! {
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157 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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158 [
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159 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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160 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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161 ]
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162 .iter()
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163 .map(|code| {
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164 std::char::from_u32(*code)
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165 .unwrap()
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166 .encode_utf8(&mut [0; 3])
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167 .bytes()
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168 .collect()
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169 })
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170 .collect()
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171 };
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172 }
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173
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174 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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175 let mut buf = bytes.to_owned();
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176 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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177 if needs_escaping {
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178 for forbidden in IGNORED_CHARS.iter() {
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179 replace_slice(&mut buf, forbidden, &[])
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180 }
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181 buf
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182 } else {
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183 buf
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184 }
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185 }
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186
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187 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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188 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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189 }
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190
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191 /// Returns the canonical path of `name`, given `cwd` and `root`
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192 pub fn canonical_path(
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193 root: impl AsRef<Path>,
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194 cwd: impl AsRef<Path>,
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195 name: impl AsRef<Path>,
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196 ) -> Result<PathBuf, HgPathError> {
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197 // TODO add missing normalization for other platforms
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198 let root = root.as_ref();
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199 let cwd = cwd.as_ref();
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200 let name = name.as_ref();
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201
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202 let name = if !name.is_absolute() {
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203 root.join(cwd).join(name)
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204 } else {
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205 name.to_owned()
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206 };
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207 let auditor = PathAuditor::new(root);
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208 if name != root && name.starts_with(root) {
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209 let name = name.strip_prefix(root).unwrap();
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210 auditor.audit_path(path_to_hg_path_buf(name)?)?;
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211 Ok(name.to_owned())
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212 } else if name == root {
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213 Ok("".into())
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214 } else {
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215 // Determine whether `name' is in the hierarchy at or beneath `root',
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216 // by iterating name=name.parent() until it returns `None` (can't
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217 // check name == '/', because that doesn't work on windows).
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218 let mut name = name.deref();
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219 let original_name = name.to_owned();
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220 loop {
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221 let same = is_same_file(name, root).unwrap_or(false);
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222 if same {
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223 if name == original_name {
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224 // `name` was actually the same as root (maybe a symlink)
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225 return Ok("".into());
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226 }
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227 // `name` is a symlink to root, so `original_name` is under
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228 // root
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229 let rel_path = original_name.strip_prefix(name).unwrap();
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230 auditor.audit_path(path_to_hg_path_buf(rel_path)?)?;
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231 return Ok(rel_path.to_owned());
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232 }
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233 name = match name.parent() {
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234 None => break,
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235 Some(p) => p,
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236 };
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237 }
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238 // TODO hint to the user about using --cwd
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239 // Bubble up the responsibility to Python for now
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240 Err(HgPathError::NotUnderRoot {
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241 path: original_name,
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242 root: root.to_owned(),
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243 })
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244 }
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245 }
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246
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247 /// Returns the representation of the path relative to the current working
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248 /// directory for display purposes.
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249 ///
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250 /// `cwd` is a `HgPath`, so it is considered relative to the root directory
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251 /// of the repository.
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252 ///
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253 /// # Examples
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254 ///
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255 /// ```
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256 /// use hg::utils::hg_path::HgPath;
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257 /// use hg::utils::files::relativize_path;
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258 /// use std::borrow::Cow;
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259 ///
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260 /// let file = HgPath::new(b"nested/file");
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261 /// let cwd = HgPath::new(b"");
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262 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file"));
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263 ///
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264 /// let cwd = HgPath::new(b"nested");
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265 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file"));
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266 ///
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267 /// let cwd = HgPath::new(b"other");
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268 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file"));
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269 /// ```
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270 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> {
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271 if cwd.as_ref().is_empty() {
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272 Cow::Borrowed(path.as_bytes())
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273 } else {
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274 // This is not all accurate as to how large `res` will actually be, but
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275 // profiling `rhg files` on a large-ish repo shows it’s better than
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276 // starting from a zero-capacity `Vec` and letting `extend` reallocate
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277 // repeatedly.
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278 let guesstimate = path.as_bytes().len();
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279
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280 let mut res: Vec<u8> = Vec::with_capacity(guesstimate);
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281 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable();
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282 let mut cwd_iter =
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283 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable();
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284 loop {
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285 match (path_iter.peek(), cwd_iter.peek()) {
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286 (Some(a), Some(b)) if a == b => (),
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287 _ => break,
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288 }
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289 path_iter.next();
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290 cwd_iter.next();
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291 }
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292 let mut need_sep = false;
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293 for _ in cwd_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(b"..");
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300 }
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301 for c in path_iter {
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302 if need_sep {
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303 res.extend(b"/")
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304 } else {
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305 need_sep = true
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306 };
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307 res.extend(c);
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308 }
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309 Cow::Owned(res)
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310 }
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311 }
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312
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313 /// Return the `mtime` of a temporary file newly-created in the `.hg` directory
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314 /// of the give repository.
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315 ///
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316 /// This is similar to `SystemTime::now()`, with the result truncated to the
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317 /// same time resolution as other files’ modification times. Using `.hg`
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318 /// instead of the system’s default temporary directory (such as `/tmp`) makes
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319 /// it more likely the temporary file is in the same disk partition as contents
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320 /// of the working directory, which can matter since different filesystems may
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321 /// store timestamps with different resolutions.
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322 ///
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323 /// This may fail, typically if we lack write permissions. In that case we
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324 /// should continue the `status()` algoritm anyway and consider the current
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325 /// date/time to be unknown.
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326 pub fn filesystem_now(repo_root: &Path) -> Result<SystemTime, io::Error> {
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327 tempfile::tempfile_in(repo_root.join(".hg"))?
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328 .metadata()?
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329 .modified()
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330 }
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331
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332 #[cfg(test)]
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333 mod tests {
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334 use super::*;
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335 use pretty_assertions::assert_eq;
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336
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337 #[test]
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338 fn find_dirs_some() {
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339 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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340 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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341 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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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 find_dirs_empty() {
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349 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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350 let mut dirs = super::find_dirs(HgPath::new(b""));
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351 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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352 assert_eq!(dirs.next(), None);
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353 assert_eq!(dirs.next(), None);
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354 }
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355
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356 #[test]
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357 fn test_find_dirs_with_base_some() {
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358 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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359 assert_eq!(
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360 dirs.next(),
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361 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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362 );
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363 assert_eq!(
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364 dirs.next(),
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365 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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366 );
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367 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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368 assert_eq!(dirs.next(), None);
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369 assert_eq!(dirs.next(), None);
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370 }
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371
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372 #[test]
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373 fn test_find_dirs_with_base_empty() {
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374 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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375 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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376 assert_eq!(dirs.next(), None);
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377 assert_eq!(dirs.next(), None);
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378 }
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379
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380 #[test]
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381 fn test_canonical_path() {
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382 let root = Path::new("/repo");
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383 let cwd = Path::new("/dir");
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384 let name = Path::new("filename");
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385 assert_eq!(
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386 canonical_path(root, cwd, name),
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diff changeset
387 Err(HgPathError::NotUnderRoot {
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388 path: PathBuf::from("/dir/filename"),
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389 root: root.to_path_buf()
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390 })
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
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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("/");
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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),
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
398 Err(HgPathError::NotUnderRoot {
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
399 path: PathBuf::from("/filename"),
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400 root: root.to_path_buf()
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401 })
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
402 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
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403
4caac36c66bc rust-utils: add util for canonical path
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404 let root = Path::new("/repo");
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405 let cwd = Path::new("/");
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406 let name = Path::new("repo/filename");
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407 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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408 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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409 Ok(PathBuf::from("filename"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
410 );
4caac36c66bc rust-utils: add util for canonical path
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411
4caac36c66bc rust-utils: add util for canonical path
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412 let root = Path::new("/repo");
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413 let cwd = Path::new("/repo");
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414 let name = Path::new("filename");
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
415 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
416 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
417 Ok(PathBuf::from("filename"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
418 );
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
419
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
420 let root = Path::new("/repo");
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421 let cwd = Path::new("/repo/subdir");
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422 let name = Path::new("filename");
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
423 assert_eq!(
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diff changeset
424 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
425 Ok(PathBuf::from("subdir/filename"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
426 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
427 }
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
428
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
429 #[test]
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
430 fn test_canonical_path_not_rooted() {
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diff changeset
431 use std::fs::create_dir;
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
432 use tempfile::tempdir;
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
433
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
434 let base_dir = tempdir().unwrap();
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
435 let base_dir_path = base_dir.path();
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
436 let beneath_repo = base_dir_path.join("a");
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
437 let root = base_dir_path.join("a/b");
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
438 let out_of_repo = base_dir_path.join("c");
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
439 let under_repo_symlink = out_of_repo.join("d");
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
440
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
441 create_dir(&beneath_repo).unwrap();
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
442 create_dir(&root).unwrap();
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
443
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
444 // TODO make portable
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
445 std::os::unix::fs::symlink(&root, &out_of_repo).unwrap();
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
446
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
447 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
448 canonical_path(&root, Path::new(""), out_of_repo),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
449 Ok(PathBuf::from(""))
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
450 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44267
diff changeset
451 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
452 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
453 Err(HgPathError::NotUnderRoot {
49930
e98fd81bb151 rust-clippy: fix most warnings in `hg-core`
Rapha?l Gom?s <rgomes@octobus.net>
parents: 48082
diff changeset
454 path: beneath_repo,
44301
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
455 root: root.to_owned()
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
456 })
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
457 );
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
458 assert_eq!(
51117
532e74ad3ff6 rust: run a clippy pass with the latest stable version
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49930
diff changeset
459 canonical_path(&root, Path::new(""), under_repo_symlink),
44301
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
460 Ok(PathBuf::from("d"))
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
461 );
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44267
diff changeset
462 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
Yuya Nishihara <yuya@tcha.org>
parents: 42484
diff changeset
463 }