Mercurial > hg
annotate hgext/git/__init__.py @ 46230:1fcab88ab85c
downgrade: if a compression is removed, consider that too
For compression format variant, the result of `fromrepo()` and `fromconfig()` is
not a boolean and we have to actually equate those to find change.
Differential Revision: https://phab.mercurial-scm.org/D9693
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 08 Jan 2021 23:06:38 +0530 |
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1 """grant Mercurial the ability to operate on Git repositories. (EXPERIMENTAL) |
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2 |
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3 This is currently super experimental. It probably will consume your |
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4 firstborn a la Rumpelstiltskin, etc. |
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5 """ |
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6 |
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7 from __future__ import absolute_import |
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8 |
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9 import os |
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10 |
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11 from mercurial.i18n import _ |
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12 |
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13 from mercurial import ( |
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14 commands, |
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15 error, |
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16 extensions, |
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17 localrepo, |
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18 pycompat, |
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19 registrar, |
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20 scmutil, |
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21 store, |
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22 util, |
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23 ) |
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24 |
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25 from . import ( |
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26 dirstate, |
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27 gitlog, |
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28 gitutil, |
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29 index, |
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30 ) |
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31 |
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32 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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33 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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34 # be specifying the version(s) of Mercurial they are tested with, or |
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35 # leave the attribute unspecified. |
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36 testedwith = b'ships-with-hg-core' |
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37 |
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38 configtable = {} |
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39 configitem = registrar.configitem(configtable) |
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40 # git.log-index-cache-miss: internal knob for testing |
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41 configitem( |
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42 b"git", |
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43 b"log-index-cache-miss", |
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44 default=False, |
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45 ) |
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46 |
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47 getversion = gitutil.pygit2_version |
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48 |
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49 |
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50 # TODO: extract an interface for this in core |
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51 class gitstore(object): # store.basicstore): |
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52 def __init__(self, path, vfstype): |
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53 self.vfs = vfstype(path) |
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54 self.path = self.vfs.base |
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55 self.createmode = store._calcmode(self.vfs) |
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56 # above lines should go away in favor of: |
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57 # super(gitstore, self).__init__(path, vfstype) |
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58 |
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59 self.git = gitutil.get_pygit2().Repository( |
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60 os.path.normpath(os.path.join(path, b'..', b'.git')) |
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61 ) |
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62 self._progress_factory = lambda *args, **kwargs: None |
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63 self._logfn = lambda x: None |
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64 |
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65 @util.propertycache |
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66 def _db(self): |
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67 # We lazy-create the database because we want to thread a |
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68 # progress callback down to the indexing process if it's |
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69 # required, and we don't have a ui handle in makestore(). |
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70 return index.get_index(self.git, self._logfn, self._progress_factory) |
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71 |
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72 def join(self, f): |
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73 """Fake store.join method for git repositories. |
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74 |
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75 For the most part, store.join is used for @storecache |
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76 decorators to invalidate caches when various files |
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77 change. We'll map the ones we care about, and ignore the rest. |
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78 """ |
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79 if f in (b'00changelog.i', b'00manifest.i'): |
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80 # This is close enough: in order for the changelog cache |
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81 # to be invalidated, HEAD will have to change. |
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82 return os.path.join(self.path, b'HEAD') |
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83 elif f == b'lock': |
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84 # TODO: we probably want to map this to a git lock, I |
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85 # suspect index.lock. We should figure out what the |
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86 # most-alike file is in git-land. For now we're risking |
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87 # bad concurrency errors if another git client is used. |
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88 return os.path.join(self.path, b'hgit-bogus-lock') |
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89 elif f in (b'obsstore', b'phaseroots', b'narrowspec', b'bookmarks'): |
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90 return os.path.join(self.path, b'..', b'.hg', f) |
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91 raise NotImplementedError(b'Need to pick file for %s.' % f) |
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92 |
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93 def changelog(self, trypending): |
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94 # TODO we don't have a plan for trypending in hg's git support yet |
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95 return gitlog.changelog(self.git, self._db) |
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96 |
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97 def manifestlog(self, repo, storenarrowmatch): |
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98 # TODO handle storenarrowmatch and figure out if we need the repo arg |
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99 return gitlog.manifestlog(self.git, self._db) |
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100 |
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101 def invalidatecaches(self): |
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102 pass |
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103 |
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104 def write(self, tr=None): |
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105 # normally this handles things like fncache writes, which we don't have |
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106 pass |
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107 |
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108 |
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109 def _makestore(orig, requirements, storebasepath, vfstype): |
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110 if b'git' in requirements: |
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111 if not os.path.exists(os.path.join(storebasepath, b'..', b'.git')): |
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112 raise error.Abort( |
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113 _( |
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114 b'repository specified git format in ' |
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115 b'.hg/requires but has no .git directory' |
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116 ) |
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117 ) |
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118 # Check for presence of pygit2 only here. The assumption is that we'll |
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119 # run this code iff we'll later need pygit2. |
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120 if gitutil.get_pygit2() is None: |
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121 raise error.Abort( |
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122 _( |
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123 b'the git extension requires the Python ' |
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124 b'pygit2 library to be installed' |
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125 ) |
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126 ) |
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127 |
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128 return gitstore(storebasepath, vfstype) |
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129 return orig(requirements, storebasepath, vfstype) |
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130 |
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131 |
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132 class gitfilestorage(object): |
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133 def file(self, path): |
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134 if path[0:1] == b'/': |
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135 path = path[1:] |
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136 return gitlog.filelog(self.store.git, self.store._db, path) |
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137 |
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138 |
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139 def _makefilestorage(orig, requirements, features, **kwargs): |
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140 store = kwargs['store'] |
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141 if isinstance(store, gitstore): |
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142 return gitfilestorage |
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143 return orig(requirements, features, **kwargs) |
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144 |
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145 |
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146 def _setupdothg(ui, path): |
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147 dothg = os.path.join(path, b'.hg') |
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148 if os.path.exists(dothg): |
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149 ui.warn(_(b'git repo already initialized for hg\n')) |
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150 else: |
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151 os.mkdir(os.path.join(path, b'.hg')) |
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152 # TODO is it ok to extend .git/info/exclude like this? |
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153 with open( |
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154 os.path.join(path, b'.git', b'info', b'exclude'), 'ab' |
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155 ) as exclude: |
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156 exclude.write(b'\n.hg\n') |
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157 with open(os.path.join(dothg, b'requires'), 'wb') as f: |
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158 f.write(b'git\n') |
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159 |
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160 |
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161 _BMS_PREFIX = 'refs/heads/' |
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162 |
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163 |
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164 class gitbmstore(object): |
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165 def __init__(self, gitrepo): |
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166 self.gitrepo = gitrepo |
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167 self._aclean = True |
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168 self._active = gitrepo.references['HEAD'] # git head, not mark |
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169 |
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170 def __contains__(self, name): |
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171 return ( |
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172 _BMS_PREFIX + pycompat.fsdecode(name) |
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173 ) in self.gitrepo.references |
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174 |
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175 def __iter__(self): |
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176 for r in self.gitrepo.listall_references(): |
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177 if r.startswith(_BMS_PREFIX): |
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178 yield pycompat.fsencode(r[len(_BMS_PREFIX) :]) |
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179 |
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180 def __getitem__(self, k): |
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181 return ( |
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182 self.gitrepo.references[_BMS_PREFIX + pycompat.fsdecode(k)] |
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183 .peel() |
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184 .id.raw |
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185 ) |
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186 |
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187 def get(self, k, default=None): |
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188 try: |
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189 if k in self: |
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190 return self[k] |
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191 return default |
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192 except gitutil.get_pygit2().InvalidSpecError: |
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193 return default |
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194 |
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195 @property |
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196 def active(self): |
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197 h = self.gitrepo.references['HEAD'] |
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198 if not isinstance(h.target, str) or not h.target.startswith( |
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199 _BMS_PREFIX |
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200 ): |
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201 return None |
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202 return pycompat.fsencode(h.target[len(_BMS_PREFIX) :]) |
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203 |
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204 @active.setter |
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205 def active(self, mark): |
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206 githead = mark is not None and (_BMS_PREFIX + mark) or None |
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207 if githead is not None and githead not in self.gitrepo.references: |
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208 raise AssertionError(b'bookmark %s does not exist!' % mark) |
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209 |
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210 self._active = githead |
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211 self._aclean = False |
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212 |
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213 def _writeactive(self): |
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214 if self._aclean: |
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215 return |
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216 self.gitrepo.references.create('HEAD', self._active, True) |
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217 self._aclean = True |
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218 |
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219 def names(self, node): |
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220 r = [] |
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221 for ref in self.gitrepo.listall_references(): |
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222 if not ref.startswith(_BMS_PREFIX): |
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223 continue |
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224 if self.gitrepo.references[ref].peel().id.raw != node: |
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225 continue |
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226 r.append(pycompat.fsencode(ref[len(_BMS_PREFIX) :])) |
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227 return r |
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228 |
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229 # Cleanup opportunity: this is *identical* to core's bookmarks store. |
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230 def expandname(self, bname): |
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231 if bname == b'.': |
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232 if self.active: |
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233 return self.active |
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234 raise error.RepoLookupError(_(b"no active bookmark")) |
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235 return bname |
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236 |
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237 def applychanges(self, repo, tr, changes): |
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238 """Apply a list of changes to bookmarks""" |
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239 # TODO: this should respect transactions, but that's going to |
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240 # require enlarging the gitbmstore to know how to do in-memory |
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241 # temporary writes and read those back prior to transaction |
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242 # finalization. |
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243 for name, node in changes: |
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244 if node is None: |
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245 self.gitrepo.references.delete( |
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246 _BMS_PREFIX + pycompat.fsdecode(name) |
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247 ) |
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248 else: |
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249 self.gitrepo.references.create( |
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250 _BMS_PREFIX + pycompat.fsdecode(name), |
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251 gitutil.togitnode(node), |
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252 force=True, |
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253 ) |
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254 |
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255 def checkconflict(self, mark, force=False, target=None): |
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256 githead = _BMS_PREFIX + mark |
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257 cur = self.gitrepo.references['HEAD'] |
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258 if githead in self.gitrepo.references and not force: |
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259 if target: |
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260 if self.gitrepo.references[githead] == target and target == cur: |
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261 # re-activating a bookmark |
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262 return [] |
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263 # moving a bookmark - forward? |
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264 raise NotImplementedError |
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265 raise error.Abort( |
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266 _(b"bookmark '%s' already exists (use -f to force)") % mark |
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267 ) |
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268 if len(mark) > 3 and not force: |
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269 try: |
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270 shadowhash = scmutil.isrevsymbol(self._repo, mark) |
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271 except error.LookupError: # ambiguous identifier |
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272 shadowhash = False |
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273 if shadowhash: |
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274 self._repo.ui.warn( |
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275 _( |
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276 b"bookmark %s matches a changeset hash\n" |
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277 b"(did you leave a -r out of an 'hg bookmark' " |
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278 b"command?)\n" |
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279 ) |
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280 % mark |
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281 ) |
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282 return [] |
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283 |
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284 |
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285 def init(orig, ui, dest=b'.', **opts): |
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286 if opts.get('git', False): |
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287 path = os.path.abspath(dest) |
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288 # TODO: walk up looking for the git repo |
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289 _setupdothg(ui, path) |
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290 return 0 |
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291 return orig(ui, dest=dest, **opts) |
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292 |
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293 |
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294 def reposetup(ui, repo): |
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295 if repo.local() and isinstance(repo.store, gitstore): |
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296 orig = repo.__class__ |
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297 repo.store._progress_factory = repo.ui.makeprogress |
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298 if ui.configbool(b'git', b'log-index-cache-miss'): |
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299 repo.store._logfn = repo.ui.warn |
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300 |
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301 class gitlocalrepo(orig): |
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302 def _makedirstate(self): |
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303 # TODO narrow support here |
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304 return dirstate.gitdirstate( |
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305 self.ui, self.vfs.base, self.store.git |
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306 ) |
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307 |
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308 def commit(self, *args, **kwargs): |
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309 ret = orig.commit(self, *args, **kwargs) |
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310 if ret is None: |
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311 # there was nothing to commit, so we should skip |
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312 # the index fixup logic we'd otherwise do. |
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313 return None |
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314 tid = self.store.git[gitutil.togitnode(ret)].tree.id |
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315 # DANGER! This will flush any writes staged to the |
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316 # index in Git, but we're sidestepping the index in a |
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317 # way that confuses git when we commit. Alas. |
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318 self.store.git.index.read_tree(tid) |
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319 self.store.git.index.write() |
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320 return ret |
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321 |
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322 @property |
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323 def _bookmarks(self): |
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324 return gitbmstore(self.store.git) |
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325 |
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326 repo.__class__ = gitlocalrepo |
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327 return repo |
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328 |
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329 |
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330 def _featuresetup(ui, supported): |
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331 # don't die on seeing a repo with the git requirement |
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332 supported |= {b'git'} |
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333 |
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334 |
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335 def extsetup(ui): |
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336 extensions.wrapfunction(localrepo, b'makestore', _makestore) |
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337 extensions.wrapfunction(localrepo, b'makefilestorage', _makefilestorage) |
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338 # Inject --git flag for `hg init` |
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339 entry = extensions.wrapcommand(commands.table, b'init', init) |
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340 entry[1].extend( |
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341 [(b'', b'git', None, b'setup up a git repository instead of hg')] |
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342 ) |
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343 localrepo.featuresetupfuncs.add(_featuresetup) |