Mercurial > hg
annotate hgext/git/__init__.py @ 44477:ad718271a9eb
git: skeleton of a new extension to _directly_ operate on git repos
This is based in part of work I did years ago in hgit, but it's mostly
new code since I'm using pygit2 instead of dulwich and the hg storage
interfaces have improved. Some cleanup of old hgit code by Pulkit,
which I greatly appreciate.
test-git-interop.t does not cover a whole lot of cases, but it
passes. It includes status, diff, making a new commit, and `hg annotate`
working on the git repository.
This is _not_ (yet) production quality code: this is an
experiment. Known technical debt lurking in this implementation:
* Writing bookmarks just totally ignores transactions.
* The way progress is threaded down into the gitstore is awful.
* Ideally we'd find a way to incrementally reindex DAGs. I'm not sure
how to do that efficiently, so we might need a "known only fast-forwards"
mode on the DAG indexer for use on `hg commit` and friends.
* We don't even _try_ to do anything reasonable for `hg pull` or `hg push`.
* Mercurial need an interface for the changelog type.
Tests currently require git 2.24 as far as I'm aware: `git status` has
some changed output that I didn't try and handle in a compatible way.
This patch has produced some interesting cleanups, most recently on
the manifest type. I expect continuing down this road will produce
other meritorious cleanups throughout our code.
Differential Revision: https://phab.mercurial-scm.org/D6734
author | Augie Fackler <augie@google.com> |
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date | Tue, 11 Feb 2020 00:44:59 -0500 |
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children | ec54b3d2af0b |
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44477
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git: skeleton of a new extension to _directly_ operate on git repos
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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 import pygit2 |
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12 |
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13 from mercurial.i18n import _ |
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14 |
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15 from mercurial import ( |
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16 commands, |
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17 error, |
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18 extensions, |
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19 localrepo, |
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20 pycompat, |
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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 |
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33 # TODO: extract an interface for this in core |
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34 class gitstore(object): # store.basicstore): |
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35 def __init__(self, path, vfstype): |
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36 self.vfs = vfstype(path) |
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37 self.path = self.vfs.base |
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38 self.createmode = store._calcmode(self.vfs) |
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39 # above lines should go away in favor of: |
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40 # super(gitstore, self).__init__(path, vfstype) |
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41 |
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42 self.git = pygit2.Repository( |
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43 os.path.normpath(os.path.join(path, b'..', b'.git')) |
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44 ) |
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45 self._progress_factory = lambda *args, **kwargs: None |
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46 |
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47 @util.propertycache |
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48 def _db(self): |
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49 # We lazy-create the database because we want to thread a |
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50 # progress callback down to the indexing process if it's |
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51 # required, and we don't have a ui handle in makestore(). |
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52 return index.get_index(self.git, self._progress_factory) |
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53 |
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54 def join(self, f): |
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55 """Fake store.join method for git repositories. |
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56 |
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57 For the most part, store.join is used for @storecache |
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58 decorators to invalidate caches when various files |
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59 change. We'll map the ones we care about, and ignore the rest. |
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60 """ |
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61 if f in (b'00changelog.i', b'00manifest.i'): |
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62 # This is close enough: in order for the changelog cache |
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63 # to be invalidated, HEAD will have to change. |
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64 return os.path.join(self.path, b'HEAD') |
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65 elif f == b'lock': |
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66 # TODO: we probably want to map this to a git lock, I |
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67 # suspect index.lock. We should figure out what the |
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68 # most-alike file is in git-land. For now we're risking |
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69 # bad concurrency errors if another git client is used. |
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70 return os.path.join(self.path, b'hgit-bogus-lock') |
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71 elif f in (b'obsstore', b'phaseroots', b'narrowspec', b'bookmarks'): |
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72 return os.path.join(self.path, b'..', b'.hg', f) |
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73 raise NotImplementedError(b'Need to pick file for %s.' % f) |
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74 |
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75 def changelog(self, trypending): |
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76 # TODO we don't have a plan for trypending in hg's git support yet |
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77 return gitlog.changelog(self.git, self._db) |
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78 |
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79 def manifestlog(self, repo, storenarrowmatch): |
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80 # TODO handle storenarrowmatch and figure out if we need the repo arg |
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81 return gitlog.manifestlog(self.git, self._db) |
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82 |
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83 def invalidatecaches(self): |
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84 pass |
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85 |
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86 def write(self, tr=None): |
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87 # normally this handles things like fncache writes, which we don't have |
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88 pass |
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89 |
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90 |
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91 def _makestore(orig, requirements, storebasepath, vfstype): |
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92 if os.path.exists( |
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93 os.path.join(storebasepath, b'this-is-git') |
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94 ) and os.path.exists(os.path.join(storebasepath, b'..', b'.git')): |
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95 return gitstore(storebasepath, vfstype) |
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96 return orig(requirements, storebasepath, vfstype) |
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97 |
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98 |
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99 class gitfilestorage(object): |
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100 def file(self, path): |
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101 if path[0:1] == b'/': |
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102 path = path[1:] |
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103 return gitlog.filelog(self.store.git, self.store._db, path) |
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104 |
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105 |
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106 def _makefilestorage(orig, requirements, features, **kwargs): |
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107 store = kwargs['store'] |
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108 if isinstance(store, gitstore): |
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109 return gitfilestorage |
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110 return orig(requirements, features, **kwargs) |
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111 |
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112 |
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113 def _setupdothg(ui, path): |
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114 dothg = os.path.join(path, b'.hg') |
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115 if os.path.exists(dothg): |
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116 ui.warn(_(b'git repo already initialized for hg\n')) |
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117 else: |
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118 os.mkdir(os.path.join(path, b'.hg')) |
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119 # TODO is it ok to extend .git/info/exclude like this? |
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120 with open( |
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121 os.path.join(path, b'.git', b'info', b'exclude'), 'ab' |
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122 ) as exclude: |
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123 exclude.write(b'\n.hg\n') |
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124 with open(os.path.join(dothg, b'this-is-git'), 'wb') as f: |
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125 pass |
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126 with open(os.path.join(dothg, b'requirements'), 'wb') as f: |
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127 f.write(b'git\n') |
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128 |
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129 |
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130 _BMS_PREFIX = 'refs/heads/' |
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131 |
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132 |
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133 class gitbmstore(object): |
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134 def __init__(self, gitrepo): |
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135 self.gitrepo = gitrepo |
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136 |
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137 def __contains__(self, name): |
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138 return ( |
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139 _BMS_PREFIX + pycompat.fsdecode(name) |
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140 ) in self.gitrepo.references |
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141 |
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142 def __iter__(self): |
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143 for r in self.gitrepo.listall_references(): |
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144 if r.startswith(_BMS_PREFIX): |
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145 yield pycompat.fsencode(r[len(_BMS_PREFIX) :]) |
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146 |
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147 def __getitem__(self, k): |
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148 return ( |
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149 self.gitrepo.references[_BMS_PREFIX + pycompat.fsdecode(k)] |
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150 .peel() |
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151 .id.raw |
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152 ) |
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153 |
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154 def get(self, k, default=None): |
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155 try: |
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156 if k in self: |
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157 return self[k] |
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158 return default |
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159 except pygit2.InvalidSpecError: |
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160 return default |
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161 |
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162 @property |
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163 def active(self): |
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164 h = self.gitrepo.references['HEAD'] |
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165 if not isinstance(h.target, str) or not h.target.startswith( |
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166 _BMS_PREFIX |
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167 ): |
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168 return None |
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169 return pycompat.fsencode(h.target[len(_BMS_PREFIX) :]) |
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170 |
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171 @active.setter |
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172 def active(self, mark): |
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173 raise NotImplementedError |
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174 |
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175 def names(self, node): |
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176 r = [] |
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177 for ref in self.gitrepo.listall_references(): |
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178 if not ref.startswith(_BMS_PREFIX): |
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179 continue |
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180 if self.gitrepo.references[ref].peel().id.raw != node: |
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181 continue |
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182 r.append(pycompat.fsencode(ref[len(_BMS_PREFIX) :])) |
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183 return r |
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184 |
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185 # Cleanup opportunity: this is *identical* to core's bookmarks store. |
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186 def expandname(self, bname): |
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187 if bname == b'.': |
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188 if self.active: |
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189 return self.active |
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190 raise error.RepoLookupError(_(b"no active bookmark")) |
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191 return bname |
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192 |
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193 def applychanges(self, repo, tr, changes): |
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194 """Apply a list of changes to bookmarks |
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195 """ |
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196 # TODO: this should respect transactions, but that's going to |
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197 # require enlarging the gitbmstore to know how to do in-memory |
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198 # temporary writes and read those back prior to transaction |
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199 # finalization. |
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200 for name, node in changes: |
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201 if node is None: |
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202 self.gitrepo.references.delete( |
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203 _BMS_PREFIX + pycompat.fsdecode(name) |
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204 ) |
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205 else: |
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206 self.gitrepo.references.create( |
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207 _BMS_PREFIX + pycompat.fsdecode(name), |
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208 gitutil.togitnode(node), |
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209 force=True, |
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210 ) |
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211 |
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212 |
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213 def init(orig, ui, dest=b'.', **opts): |
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214 if opts.get('git', False): |
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215 path = os.path.abspath(dest) |
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216 # TODO: walk up looking for the git repo |
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217 _setupdothg(ui, path) |
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218 return 0 |
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219 return orig(ui, dest=dest, **opts) |
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220 |
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221 |
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222 def reposetup(ui, repo): |
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223 if isinstance(repo.store, gitstore): |
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224 orig = repo.__class__ |
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225 repo.store._progress_factory = repo.ui.makeprogress |
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226 |
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227 class gitlocalrepo(orig): |
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228 def _makedirstate(self): |
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229 # TODO narrow support here |
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230 return dirstate.gitdirstate( |
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231 self.ui, self.vfs.base, self.store.git |
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232 ) |
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233 |
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234 def commit(self, *args, **kwargs): |
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235 ret = orig.commit(self, *args, **kwargs) |
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236 tid = self.store.git[gitutil.togitnode(ret)].tree.id |
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237 # DANGER! This will flush any writes staged to the |
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238 # index in Git, but we're sidestepping the index in a |
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239 # way that confuses git when we commit. Alas. |
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240 self.store.git.index.read_tree(tid) |
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241 self.store.git.index.write() |
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242 return ret |
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243 |
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244 @property |
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245 def _bookmarks(self): |
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246 return gitbmstore(self.store.git) |
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247 |
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248 repo.__class__ = gitlocalrepo |
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249 return repo |
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250 |
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git: skeleton of a new extension to _directly_ operate on git repos
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251 |
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252 def extsetup(ui): |
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253 extensions.wrapfunction(localrepo, b'makestore', _makestore) |
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254 extensions.wrapfunction(localrepo, b'makefilestorage', _makefilestorage) |
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255 # Inject --git flag for `hg init` |
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256 entry = extensions.wrapcommand(commands.table, b'init', init) |
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257 entry[1].extend( |
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258 [(b'', b'git', None, b'setup up a git repository instead of hg')] |
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259 ) |