Mercurial > hg
annotate rust/hg-core/src/requirements.rs @ 46462:d03b0601e0eb
rhg: initial support for shared repositories
Differential Revision: https://phab.mercurial-scm.org/D9941
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Thu, 14 Jan 2021 13:04:12 +0100 |
parents | 43d63979a75e |
children | 95b276283b67 |
rev | line source |
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1 use crate::errors::{HgError, HgResultExt}; |
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2 use crate::repo::{Repo, Vfs}; |
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3 use std::collections::HashSet; |
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4 |
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5 fn parse(bytes: &[u8]) -> Result<HashSet<String>, HgError> { |
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6 // The Python code reading this file uses `str.splitlines` |
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7 // which looks for a number of line separators (even including a couple of |
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8 // non-ASCII ones), but Python code writing it always uses `\n`. |
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9 let lines = bytes.split(|&byte| byte == b'\n'); |
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10 |
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11 lines |
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12 .filter(|line| !line.is_empty()) |
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13 .map(|line| { |
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14 // Python uses Unicode `str.isalnum` but feature names are all |
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15 // ASCII |
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16 if line[0].is_ascii_alphanumeric() && line.is_ascii() { |
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17 Ok(String::from_utf8(line.into()).unwrap()) |
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18 } else { |
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19 Err(HgError::corrupted("parse error in 'requires' file")) |
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20 } |
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21 }) |
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22 .collect() |
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23 } |
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24 |
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25 pub(crate) fn load_if_exists(hg_vfs: Vfs) -> Result<HashSet<String>, HgError> { |
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26 if let Some(bytes) = hg_vfs.read("requires").io_not_found_as_none()? { |
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27 parse(&bytes) |
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28 } else { |
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29 // Treat a missing file the same as an empty file. |
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30 // From `mercurial/localrepo.py`: |
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31 // > requires file contains a newline-delimited list of |
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32 // > features/capabilities the opener (us) must have in order to use |
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33 // > the repository. This file was introduced in Mercurial 0.9.2, |
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34 // > which means very old repositories may not have one. We assume |
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35 // > a missing file translates to no requirements. |
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36 Ok(HashSet::new()) |
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37 } |
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38 } |
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39 |
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40 pub(crate) fn check(repo: &Repo) -> Result<(), HgError> { |
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41 for feature in repo.requirements() { |
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42 if !SUPPORTED.contains(&feature.as_str()) { |
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43 // TODO: collect and all unknown features and include them in the |
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44 // error message? |
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45 return Err(HgError::UnsupportedFeature(format!( |
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46 "repository requires feature unknown to this Mercurial: {}", |
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47 feature |
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48 ))); |
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49 } |
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50 } |
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51 Ok(()) |
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52 } |
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53 |
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54 // TODO: set this to actually-supported features |
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55 const SUPPORTED: &[&str] = &[ |
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56 "dotencode", |
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57 "fncache", |
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58 "generaldelta", |
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59 "revlogv1", |
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60 SHARED_REQUIREMENT, |
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61 SPARSEREVLOG_REQUIREMENT, |
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62 RELATIVE_SHARED_REQUIREMENT, |
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63 "store", |
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64 // As of this writing everything rhg does is read-only. |
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65 // When it starts writing to the repository, it’ll need to either keep the |
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66 // persistent nodemap up to date or remove this entry: |
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67 "persistent-nodemap", |
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68 ]; |
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69 |
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70 // Copied from mercurial/requirements.py: |
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71 |
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72 /// When narrowing is finalized and no longer subject to format changes, |
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73 /// we should move this to just "narrow" or similar. |
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74 #[allow(unused)] |
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75 pub(crate) const NARROW_REQUIREMENT: &str = "narrowhg-experimental"; |
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76 |
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77 /// Enables sparse working directory usage |
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78 #[allow(unused)] |
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79 pub(crate) const SPARSE_REQUIREMENT: &str = "exp-sparse"; |
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80 |
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81 /// Enables the internal phase which is used to hide changesets instead |
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82 /// of stripping them |
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83 #[allow(unused)] |
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84 pub(crate) const INTERNAL_PHASE_REQUIREMENT: &str = "internal-phase"; |
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85 |
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86 /// Stores manifest in Tree structure |
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87 #[allow(unused)] |
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88 pub(crate) const TREEMANIFEST_REQUIREMENT: &str = "treemanifest"; |
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89 |
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90 /// Increment the sub-version when the revlog v2 format changes to lock out old |
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91 /// clients. |
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92 #[allow(unused)] |
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93 pub(crate) const REVLOGV2_REQUIREMENT: &str = "exp-revlogv2.1"; |
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94 |
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95 /// A repository with the sparserevlog feature will have delta chains that |
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96 /// can spread over a larger span. Sparse reading cuts these large spans into |
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97 /// pieces, so that each piece isn't too big. |
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98 /// Without the sparserevlog capability, reading from the repository could use |
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99 /// huge amounts of memory, because the whole span would be read at once, |
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100 /// including all the intermediate revisions that aren't pertinent for the |
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101 /// chain. This is why once a repository has enabled sparse-read, it becomes |
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102 /// required. |
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103 #[allow(unused)] |
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104 pub(crate) const SPARSEREVLOG_REQUIREMENT: &str = "sparserevlog"; |
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105 |
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106 /// A repository with the sidedataflag requirement will allow to store extra |
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107 /// information for revision without altering their original hashes. |
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108 #[allow(unused)] |
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109 pub(crate) const SIDEDATA_REQUIREMENT: &str = "exp-sidedata-flag"; |
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110 |
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111 /// A repository with the the copies-sidedata-changeset requirement will store |
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112 /// copies related information in changeset's sidedata. |
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113 #[allow(unused)] |
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114 pub(crate) const COPIESSDC_REQUIREMENT: &str = "exp-copies-sidedata-changeset"; |
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115 |
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116 /// The repository use persistent nodemap for the changelog and the manifest. |
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117 #[allow(unused)] |
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118 pub(crate) const NODEMAP_REQUIREMENT: &str = "persistent-nodemap"; |
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119 |
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120 /// Denotes that the current repository is a share |
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121 #[allow(unused)] |
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122 pub(crate) const SHARED_REQUIREMENT: &str = "shared"; |
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123 |
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124 /// Denotes that current repository is a share and the shared source path is |
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125 /// relative to the current repository root path |
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126 #[allow(unused)] |
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127 pub(crate) const RELATIVE_SHARED_REQUIREMENT: &str = "relshared"; |
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128 |
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129 /// A repository with share implemented safely. The repository has different |
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130 /// store and working copy requirements i.e. both `.hg/requires` and |
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131 /// `.hg/store/requires` are present. |
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132 #[allow(unused)] |
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133 pub(crate) const SHARESAFE_REQUIREMENT: &str = "exp-sharesafe"; |