annotate rust/hg-core/src/requirements.rs @ 52664:f5091286b10c

packaging: modernize (compat PEP 517) with less distutils and setup.py calls - setup.py: less distutils imports and setuptools required distutils is deprecated and one should import commands from setuptools to support modern workflows depending on PEP 517 and 518. Moreover, for Python >=3.12, distutils comes from setuptools. It corresponds to old and unmaintain code that do not support PEP 517. The PEP 517 frontends (pip, build, pipx, PDM, UV, etc.) are responsible for creating a venv just for the build. The build dependencies (currently only setuptools) are specified in the pyproject.toml file. Therefore, there is no reason to support building without setuptools. Calling directly setup.py is deprecated and we have to use a PEP 517 frontend. For this commit we use pip with venv. - run-tests.py: install with pip instead of direct call of setup.py Mercurial is then built in an isolated environment. - Makefile: use venv+pip instead of setup.py
author paugier <pierre.augier@univ-grenoble-alpes.fr>
date Wed, 08 Jan 2025 05:07:00 +0100
parents db7dbe6f7bb2
children 94e2547e6f3d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::errors::{HgError, HgResultExt};
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2 use crate::repo::Repo;
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3 use crate::utils::join_display;
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4 use crate::vfs::VfsImpl;
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5 use std::collections::HashSet;
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6
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7 fn parse(bytes: &[u8]) -> Result<HashSet<String>, HgError> {
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8 // The Python code reading this file uses `str.splitlines`
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9 // which looks for a number of line separators (even including a couple of
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10 // non-ASCII ones), but Python code writing it always uses `\n`.
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11 let lines = bytes.split(|&byte| byte == b'\n');
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12
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13 lines
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14 .filter(|line| !line.is_empty())
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15 .map(|line| {
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16 // Python uses Unicode `str.isalnum` but feature names are all
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17 // ASCII
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18 if line[0].is_ascii_alphanumeric() && line.is_ascii() {
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19 Ok(String::from_utf8(line.into()).unwrap())
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20 } else {
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21 Err(HgError::corrupted("parse error in 'requires' file"))
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22 }
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23 })
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24 .collect()
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25 }
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26
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27 pub(crate) fn load(hg_vfs: VfsImpl) -> Result<HashSet<String>, HgError> {
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28 parse(&hg_vfs.read("requires")?)
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29 }
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30
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31 pub(crate) fn load_if_exists(
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32 hg_vfs: &VfsImpl,
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33 ) -> Result<HashSet<String>, HgError> {
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34 if let Some(bytes) = hg_vfs.read("requires").io_not_found_as_none()? {
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35 parse(&bytes)
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36 } else {
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37 // Treat a missing file the same as an empty file.
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38 // From `mercurial/localrepo.py`:
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39 // > requires file contains a newline-delimited list of
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40 // > features/capabilities the opener (us) must have in order to use
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41 // > the repository. This file was introduced in Mercurial 0.9.2,
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42 // > which means very old repositories may not have one. We assume
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43 // > a missing file translates to no requirements.
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44 Ok(HashSet::new())
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45 }
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46 }
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47
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48 pub(crate) fn check(repo: &Repo) -> Result<(), HgError> {
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49 let unknown: Vec<_> = repo
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50 .requirements()
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51 .iter()
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52 .map(String::as_str)
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53 // .filter(|feature| !ALL_SUPPORTED.contains(feature.as_str()))
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54 .filter(|feature| {
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55 !REQUIRED.contains(feature) && !SUPPORTED.contains(feature)
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56 })
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57 .collect();
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58 if !unknown.is_empty() {
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59 return Err(HgError::unsupported(format!(
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60 "repository requires feature unknown to this Mercurial: {}",
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61 join_display(&unknown, ", ")
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62 )));
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63 }
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64 let missing: Vec<_> = REQUIRED
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65 .iter()
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66 .filter(|&&feature| !repo.requirements().contains(feature))
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67 .collect();
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68 if !missing.is_empty() {
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69 return Err(HgError::unsupported(format!(
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70 "repository is missing feature required by this Mercurial: {}",
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71 join_display(&missing, ", ")
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72 )));
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73 }
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74 Ok(())
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75 }
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76
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77 /// rhg does not support repositories that are *missing* any of these features
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78 const REQUIRED: &[&str] = &["revlogv1", "store", "fncache", "dotencode"];
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79
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80 /// rhg supports repository with or without these
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81 const SUPPORTED: &[&str] = &[
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82 GENERALDELTA_REQUIREMENT,
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83 SHARED_REQUIREMENT,
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84 SHARESAFE_REQUIREMENT,
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85 SPARSEREVLOG_REQUIREMENT,
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86 RELATIVE_SHARED_REQUIREMENT,
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87 REVLOG_COMPRESSION_ZSTD,
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88 DIRSTATE_V2_REQUIREMENT,
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89 DIRSTATE_TRACKED_HINT_V1,
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90 // As of this writing everything rhg does is read-only.
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91 // When it starts writing to the repository, it’ll need to either keep the
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92 // persistent nodemap up to date or remove this entry:
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93 NODEMAP_REQUIREMENT,
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94 // Not all commands support `sparse` and `narrow`. The commands that do
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95 // not should opt out by checking `has_sparse` and `has_narrow`.
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96 SPARSE_REQUIREMENT,
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97 NARROW_REQUIREMENT,
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98 // rhg doesn't care about bookmarks at all yet
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99 BOOKMARKS_IN_STORE_REQUIREMENT,
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100 ];
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101
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102 // Copied from mercurial/requirements.py:
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103
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104 pub const DIRSTATE_V2_REQUIREMENT: &str = "dirstate-v2";
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105 pub const GENERALDELTA_REQUIREMENT: &str = "generaldelta";
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106
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107 /// A repository that uses the tracked hint dirstate file
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108 #[allow(unused)]
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109 pub const DIRSTATE_TRACKED_HINT_V1: &str = "dirstate-tracked-key-v1";
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110
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111 /// When narrowing is finalized and no longer subject to format changes,
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112 /// we should move this to just "narrow" or similar.
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113 #[allow(unused)]
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114 pub const NARROW_REQUIREMENT: &str = "narrowhg-experimental";
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115
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116 /// Bookmarks must be stored in the `store` part of the repository and will be
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117 /// share accross shares
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118 #[allow(unused)]
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119 pub const BOOKMARKS_IN_STORE_REQUIREMENT: &str = "bookmarksinstore";
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120
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121 /// Enables sparse working directory usage
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122 #[allow(unused)]
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123 pub const SPARSE_REQUIREMENT: &str = "exp-sparse";
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124
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125 /// Enables the internal phase which is used to hide changesets instead
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126 /// of stripping them
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127 #[allow(unused)]
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128 pub const INTERNAL_PHASE_REQUIREMENT: &str = "internal-phase";
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129
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130 /// Stores manifest in Tree structure
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131 #[allow(unused)]
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132 pub const TREEMANIFEST_REQUIREMENT: &str = "treemanifest";
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133
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134 /// Whether to use the "RevlogNG" or V1 of the revlog format
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135 #[allow(unused)]
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136 pub const REVLOGV1_REQUIREMENT: &str = "revlogv1";
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137
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138 /// Increment the sub-version when the revlog v2 format changes to lock out old
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139 /// clients.
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140 #[allow(unused)]
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141 pub const REVLOGV2_REQUIREMENT: &str = "exp-revlogv2.1";
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142
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143 /// Increment the sub-version when the revlog v2 format changes to lock out old
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144 /// clients.
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145 #[allow(unused)]
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146 pub const CHANGELOGV2_REQUIREMENT: &str = "exp-changelog-v2";
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147
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148 /// A repository with the sparserevlog feature will have delta chains that
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149 /// can spread over a larger span. Sparse reading cuts these large spans into
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150 /// pieces, so that each piece isn't too big.
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151 /// Without the sparserevlog capability, reading from the repository could use
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152 /// huge amounts of memory, because the whole span would be read at once,
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153 /// including all the intermediate revisions that aren't pertinent for the
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154 /// chain. This is why once a repository has enabled sparse-read, it becomes
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155 /// required.
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156 #[allow(unused)]
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157 pub const SPARSEREVLOG_REQUIREMENT: &str = "sparserevlog";
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158
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159 /// A repository with the the copies-sidedata-changeset requirement will store
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160 /// copies related information in changeset's sidedata.
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161 #[allow(unused)]
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162 pub const COPIESSDC_REQUIREMENT: &str = "exp-copies-sidedata-changeset";
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163
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164 /// The repository use persistent nodemap for the changelog and the manifest.
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165 #[allow(unused)]
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166 pub const NODEMAP_REQUIREMENT: &str = "persistent-nodemap";
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167
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168 /// Denotes that the current repository is a share
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169 #[allow(unused)]
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170 pub const SHARED_REQUIREMENT: &str = "shared";
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171
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172 /// Denotes that current repository is a share and the shared source path is
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173 /// relative to the current repository root path
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174 #[allow(unused)]
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175 pub const RELATIVE_SHARED_REQUIREMENT: &str = "relshared";
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176
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177 /// A repository with share implemented safely. The repository has different
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178 /// store and working copy requirements i.e. both `.hg/requires` and
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179 /// `.hg/store/requires` are present.
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180 #[allow(unused)]
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181 pub const SHARESAFE_REQUIREMENT: &str = "share-safe";
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182
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183 /// A repository that use zstd compression inside its revlog
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184 #[allow(unused)]
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185 pub const REVLOG_COMPRESSION_ZSTD: &str = "revlog-compression-zstd";