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annotate rust/hg-core/src/utils/files.rs @ 46770:3c9ddb1986a9

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rust-status: fix issue6456 for the Rust implementation also This implementation is being used by a few people now, so we need it fixed, even though a big rewrite will be coming quite soon. Differential Revision: https://phab.mercurial-scm.org/D10217
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 15 Mar 2021 13:05:00 +0100
parents 91ab5190a3de
children c94fa884240b
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1 // files.rs
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2 //
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3 // Copyright 2019
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4 // Raphaël Gomès <rgomes@octobus.net>,
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5 // Yuya Nishihara <yuya@tcha.org>
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6 //
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7 // This software may be used and distributed according to the terms of the
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8 // GNU General Public License version 2 or any later version.
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9
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10 //! Functions for fiddling with files.
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11
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12 use crate::utils::{
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13 hg_path::{path_to_hg_path_buf, HgPath, HgPathBuf, HgPathError},
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14 path_auditor::PathAuditor,
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15 replace_slice,
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16 };
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17 use lazy_static::lazy_static;
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18 use same_file::is_same_file;
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19 use std::borrow::{Cow, ToOwned};
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20 use std::ffi::OsStr;
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21 use std::fs::Metadata;
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22 use std::iter::FusedIterator;
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23 use std::ops::Deref;
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24 use std::path::{Path, PathBuf};
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25
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26 pub fn get_os_str_from_bytes(bytes: &[u8]) -> &OsStr {
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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 os_str
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37 }
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38
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39 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path {
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40 Path::new(get_os_str_from_bytes(bytes))
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41 }
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42
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43 // TODO: need to convert from WTF8 to MBCS bytes on Windows.
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44 // that's why Vec<u8> is returned.
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45 #[cfg(unix)]
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46 pub fn get_bytes_from_path(path: impl AsRef<Path>) -> Vec<u8> {
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47 get_bytes_from_os_str(path.as_ref())
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48 }
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49
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50 #[cfg(unix)]
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51 pub fn get_bytes_from_os_str(str: impl AsRef<OsStr>) -> Vec<u8> {
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52 use std::os::unix::ffi::OsStrExt;
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53 str.as_ref().as_bytes().to_vec()
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54 }
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55
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56 /// An iterator over repository path yielding itself and its ancestors.
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57 #[derive(Copy, Clone, Debug)]
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58 pub struct Ancestors<'a> {
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59 next: Option<&'a HgPath>,
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60 }
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61
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62 impl<'a> Iterator for Ancestors<'a> {
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63 type Item = &'a HgPath;
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64
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65 fn next(&mut self) -> Option<Self::Item> {
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66 let next = self.next;
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67 self.next = match self.next {
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68 Some(s) if s.is_empty() => None,
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69 Some(s) => {
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70 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0);
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71 Some(HgPath::new(&s.as_bytes()[..p]))
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72 }
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73 None => None,
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74 };
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75 next
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76 }
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77 }
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78
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79 impl<'a> FusedIterator for Ancestors<'a> {}
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80
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81 /// An iterator over repository path yielding itself and its ancestors.
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82 #[derive(Copy, Clone, Debug)]
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83 pub(crate) struct AncestorsWithBase<'a> {
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84 next: Option<(&'a HgPath, &'a HgPath)>,
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85 }
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86
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87 impl<'a> Iterator for AncestorsWithBase<'a> {
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88 type Item = (&'a HgPath, &'a HgPath);
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89
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90 fn next(&mut self) -> Option<Self::Item> {
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91 let next = self.next;
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92 self.next = match self.next {
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93 Some((s, _)) if s.is_empty() => None,
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94 Some((s, _)) => Some(s.split_filename()),
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95 None => None,
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96 };
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97 next
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98 }
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99 }
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100
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101 impl<'a> FusedIterator for AncestorsWithBase<'a> {}
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102
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103 /// Returns an iterator yielding ancestor directories of the given repository
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104 /// path.
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105 ///
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106 /// The path is separated by '/', and must not start with '/'.
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107 ///
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108 /// The path itself isn't included unless it is b"" (meaning the root
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109 /// directory.)
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110 pub fn find_dirs(path: &HgPath) -> Ancestors {
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111 let mut dirs = Ancestors { next: Some(path) };
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112 if !path.is_empty() {
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113 dirs.next(); // skip itself
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114 }
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115 dirs
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116 }
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117
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118 /// Returns an iterator yielding ancestor directories of the given repository
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119 /// path.
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120 ///
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121 /// The path is separated by '/', and must not start with '/'.
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122 ///
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123 /// The path itself isn't included unless it is b"" (meaning the root
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124 /// directory.)
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125 pub(crate) fn find_dirs_with_base(path: &HgPath) -> AncestorsWithBase {
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126 let mut dirs = AncestorsWithBase {
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127 next: Some((path, HgPath::new(b""))),
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128 };
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129 if !path.is_empty() {
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130 dirs.next(); // skip itself
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131 }
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132 dirs
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133 }
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134
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135 /// TODO more than ASCII?
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136 pub fn normalize_case(path: &HgPath) -> HgPathBuf {
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137 #[cfg(windows)] // NTFS compares via upper()
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138 return path.to_ascii_uppercase();
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139 #[cfg(unix)]
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140 path.to_ascii_lowercase()
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141 }
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142
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143 lazy_static! {
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144 static ref IGNORED_CHARS: Vec<Vec<u8>> = {
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145 [
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146 0x200c, 0x200d, 0x200e, 0x200f, 0x202a, 0x202b, 0x202c, 0x202d,
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147 0x202e, 0x206a, 0x206b, 0x206c, 0x206d, 0x206e, 0x206f, 0xfeff,
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148 ]
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149 .iter()
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150 .map(|code| {
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151 std::char::from_u32(*code)
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152 .unwrap()
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153 .encode_utf8(&mut [0; 3])
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154 .bytes()
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155 .collect()
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156 })
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157 .collect()
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158 };
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159 }
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160
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161 fn hfs_ignore_clean(bytes: &[u8]) -> Vec<u8> {
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162 let mut buf = bytes.to_owned();
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163 let needs_escaping = bytes.iter().any(|b| *b == b'\xe2' || *b == b'\xef');
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164 if needs_escaping {
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165 for forbidden in IGNORED_CHARS.iter() {
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166 replace_slice(&mut buf, forbidden, &[])
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167 }
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168 buf
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169 } else {
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170 buf
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171 }
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172 }
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173
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174 pub fn lower_clean(bytes: &[u8]) -> Vec<u8> {
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175 hfs_ignore_clean(&bytes.to_ascii_lowercase())
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176 }
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177
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178 #[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
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179 pub struct HgMetadata {
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180 pub st_dev: u64,
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181 pub st_mode: u32,
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182 pub st_nlink: u64,
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183 pub st_size: u64,
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184 pub st_mtime: i64,
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185 pub st_ctime: i64,
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186 }
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187
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188 // TODO support other plaforms
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189 #[cfg(unix)]
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190 impl HgMetadata {
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191 pub fn from_metadata(metadata: Metadata) -> Self {
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192 use std::os::unix::fs::MetadataExt;
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193 Self {
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194 st_dev: metadata.dev(),
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195 st_mode: metadata.mode(),
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196 st_nlink: metadata.nlink(),
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197 st_size: metadata.size(),
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198 st_mtime: metadata.mtime(),
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199 st_ctime: metadata.ctime(),
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200 }
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201 }
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202
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203 pub fn is_symlink(&self) -> bool {
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204 // This is way too manual, but `HgMetadata` will go away in the
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205 // near-future dirstate rewrite anyway.
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206 self.st_mode & 0170000 == 0120000
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207 }
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208 }
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209
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210 /// Returns the canonical path of `name`, given `cwd` and `root`
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211 pub fn canonical_path(
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212 root: impl AsRef<Path>,
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213 cwd: impl AsRef<Path>,
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214 name: impl AsRef<Path>,
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215 ) -> Result<PathBuf, HgPathError> {
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216 // TODO add missing normalization for other platforms
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217 let root = root.as_ref();
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218 let cwd = cwd.as_ref();
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219 let name = name.as_ref();
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220
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221 let name = if !name.is_absolute() {
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222 root.join(&cwd).join(&name)
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223 } else {
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224 name.to_owned()
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225 };
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226 let auditor = PathAuditor::new(&root);
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227 if name != root && name.starts_with(&root) {
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228 let name = name.strip_prefix(&root).unwrap();
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229 auditor.audit_path(path_to_hg_path_buf(name)?)?;
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230 Ok(name.to_owned())
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231 } else if name == root {
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232 Ok("".into())
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233 } else {
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234 // Determine whether `name' is in the hierarchy at or beneath `root',
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235 // by iterating name=name.parent() until it returns `None` (can't
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236 // check name == '/', because that doesn't work on windows).
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237 let mut name = name.deref();
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238 let original_name = name.to_owned();
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239 loop {
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240 let same = is_same_file(&name, &root).unwrap_or(false);
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241 if same {
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242 if name == original_name {
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243 // `name` was actually the same as root (maybe a symlink)
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244 return Ok("".into());
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245 }
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246 // `name` is a symlink to root, so `original_name` is under
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247 // root
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248 let rel_path = original_name.strip_prefix(&name).unwrap();
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249 auditor.audit_path(path_to_hg_path_buf(&rel_path)?)?;
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250 return Ok(rel_path.to_owned());
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251 }
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252 name = match name.parent() {
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253 None => break,
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254 Some(p) => p,
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255 };
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256 }
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257 // TODO hint to the user about using --cwd
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258 // Bubble up the responsibility to Python for now
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259 Err(HgPathError::NotUnderRoot {
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260 path: original_name.to_owned(),
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261 root: root.to_owned(),
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262 })
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263 }
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264 }
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265
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266 /// Returns the representation of the path relative to the current working
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267 /// directory for display purposes.
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268 ///
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269 /// `cwd` is a `HgPath`, so it is considered relative to the root directory
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270 /// of the repository.
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271 ///
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272 /// # Examples
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273 ///
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274 /// ```
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275 /// use hg::utils::hg_path::HgPath;
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276 /// use hg::utils::files::relativize_path;
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277 /// use std::borrow::Cow;
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278 ///
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279 /// let file = HgPath::new(b"nested/file");
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280 /// let cwd = HgPath::new(b"");
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281 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"nested/file"));
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282 ///
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283 /// let cwd = HgPath::new(b"nested");
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284 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"file"));
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285 ///
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286 /// let cwd = HgPath::new(b"other");
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287 /// assert_eq!(relativize_path(file, cwd), Cow::Borrowed(b"../nested/file"));
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288 /// ```
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289 pub fn relativize_path(path: &HgPath, cwd: impl AsRef<HgPath>) -> Cow<[u8]> {
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290 if cwd.as_ref().is_empty() {
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291 Cow::Borrowed(path.as_bytes())
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292 } else {
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293 let mut res: Vec<u8> = Vec::new();
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294 let mut path_iter = path.as_bytes().split(|b| *b == b'/').peekable();
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295 let mut cwd_iter =
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296 cwd.as_ref().as_bytes().split(|b| *b == b'/').peekable();
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297 loop {
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298 match (path_iter.peek(), cwd_iter.peek()) {
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299 (Some(a), Some(b)) if a == b => (),
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300 _ => break,
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301 }
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302 path_iter.next();
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303 cwd_iter.next();
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304 }
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305 let mut need_sep = false;
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306 for _ in cwd_iter {
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307 if need_sep {
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308 res.extend(b"/")
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309 } else {
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310 need_sep = true
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311 };
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312 res.extend(b"..");
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313 }
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314 for c in path_iter {
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315 if need_sep {
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316 res.extend(b"/")
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317 } else {
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318 need_sep = true
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319 };
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320 res.extend(c);
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321 }
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322 Cow::Owned(res)
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323 }
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324 }
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325
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326 #[cfg(test)]
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327 mod tests {
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328 use super::*;
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329 use pretty_assertions::assert_eq;
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330
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331 #[test]
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332 fn find_dirs_some() {
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333 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz"));
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334 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar")));
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335 assert_eq!(dirs.next(), Some(HgPath::new(b"foo")));
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336 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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337 assert_eq!(dirs.next(), None);
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338 assert_eq!(dirs.next(), None);
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339 }
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340
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341 #[test]
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342 fn find_dirs_empty() {
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343 // looks weird, but mercurial.pathutil.finddirs(b"") yields b""
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344 let mut dirs = super::find_dirs(HgPath::new(b""));
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345 assert_eq!(dirs.next(), Some(HgPath::new(b"")));
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346 assert_eq!(dirs.next(), None);
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347 assert_eq!(dirs.next(), None);
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348 }
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349
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350 #[test]
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351 fn test_find_dirs_with_base_some() {
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352 let mut dirs = super::find_dirs_with_base(HgPath::new(b"foo/bar/baz"));
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353 assert_eq!(
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354 dirs.next(),
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355 Some((HgPath::new(b"foo/bar"), HgPath::new(b"baz")))
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356 );
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357 assert_eq!(
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358 dirs.next(),
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359 Some((HgPath::new(b"foo"), HgPath::new(b"bar")))
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360 );
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361 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b"foo"))));
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362 assert_eq!(dirs.next(), None);
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363 assert_eq!(dirs.next(), None);
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364 }
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365
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366 #[test]
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367 fn test_find_dirs_with_base_empty() {
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368 let mut dirs = super::find_dirs_with_base(HgPath::new(b""));
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369 assert_eq!(dirs.next(), Some((HgPath::new(b""), HgPath::new(b""))));
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370 assert_eq!(dirs.next(), None);
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371 assert_eq!(dirs.next(), None);
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372 }
44345
4caac36c66bc rust-utils: add util for canonical path
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373
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374 #[test]
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375 fn test_canonical_path() {
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376 let root = Path::new("/repo");
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377 let cwd = Path::new("/dir");
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378 let name = Path::new("filename");
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379 assert_eq!(
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380 canonical_path(root, cwd, name),
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diff changeset
381 Err(HgPathError::NotUnderRoot {
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382 path: PathBuf::from("/dir/filename"),
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383 root: root.to_path_buf()
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384 })
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
385 );
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386
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387 let root = Path::new("/repo");
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388 let cwd = Path::new("/");
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389 let name = Path::new("filename");
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390 assert_eq!(
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391 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
392 Err(HgPathError::NotUnderRoot {
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393 path: PathBuf::from("/filename"),
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394 root: root.to_path_buf()
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395 })
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parents: 44314
diff changeset
396 );
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397
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398 let root = Path::new("/repo");
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399 let cwd = Path::new("/");
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400 let name = Path::new("repo/filename");
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diff changeset
401 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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402 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
403 Ok(PathBuf::from("filename"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
404 );
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
405
4caac36c66bc rust-utils: add util for canonical path
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406 let root = Path::new("/repo");
4caac36c66bc rust-utils: add util for canonical path
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407 let cwd = Path::new("/repo");
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408 let name = Path::new("filename");
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
409 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
410 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
411 Ok(PathBuf::from("filename"))
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
412 );
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
413
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
414 let root = Path::new("/repo");
4caac36c66bc rust-utils: add util for canonical path
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415 let cwd = Path::new("/repo/subdir");
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416 let name = Path::new("filename");
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
417 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
418 canonical_path(root, cwd, name),
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
419 Ok(PathBuf::from("subdir/filename"))
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parents: 44314
diff changeset
420 );
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
421 }
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
422
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
423 #[test]
4caac36c66bc rust-utils: add util for canonical path
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424 fn test_canonical_path_not_rooted() {
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diff changeset
425 use std::fs::create_dir;
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
426 use tempfile::tempdir;
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
427
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
428 let base_dir = tempdir().unwrap();
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diff changeset
429 let base_dir_path = base_dir.path();
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
430 let beneath_repo = base_dir_path.join("a");
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diff changeset
431 let root = base_dir_path.join("a/b");
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diff changeset
432 let out_of_repo = base_dir_path.join("c");
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
433 let under_repo_symlink = out_of_repo.join("d");
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
434
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
435 create_dir(&beneath_repo).unwrap();
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parents: 44314
diff changeset
436 create_dir(&root).unwrap();
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
437
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
438 // TODO make portable
4caac36c66bc rust-utils: add util for canonical path
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diff changeset
439 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: 44314
diff changeset
440
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
441 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
442 canonical_path(&root, Path::new(""), out_of_repo),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
443 Ok(PathBuf::from(""))
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
444 );
4caac36c66bc rust-utils: add util for canonical path
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parents: 44314
diff changeset
445 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
446 canonical_path(&root, Path::new(""), &beneath_repo),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
447 Err(HgPathError::NotUnderRoot {
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
448 path: beneath_repo.to_owned(),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
449 root: root.to_owned()
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
450 })
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
451 );
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
452 assert_eq!(
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
453 canonical_path(&root, Path::new(""), &under_repo_symlink),
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
454 Ok(PathBuf::from("d"))
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
455 );
4caac36c66bc rust-utils: add util for canonical path
Rapha?l Gom?s <rgomes@octobus.net>
parents: 44314
diff changeset
456 }
42586
cad3dde7a573 rust-dirstate: add helper to iterate ancestor paths
Yuya Nishihara <yuya@tcha.org>
parents: 42499
diff changeset
457 }