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annotate rust/hg-core/src/requirements.rs @ 53040:cdd7bf612c7b stable tip

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bundle-spec: properly format boolean parameter (issue6960) This was breaking automatic clone bundle generation. This changeset fixes it and add a test to catch it in the future.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 11 Mar 2025 02:29:42 +0100
parents 94e2547e6f3d
children
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::strings::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";