Mercurial > hg
annotate mercurial/repair.py @ 26755:bb0b955d050d
streamclone: support for producing and consuming stream clone bundles
Up to this point, stream clones only existed as a dynamically generated
data format produced and consumed during streaming clones. In order to
support this efficient cloning format with the clone bundles feature, we
need a more formal, on disk representation of the streaming clone data.
This patch introduces a new "bundle" type for streaming clones. Unlike
existing bundles, it does not contain changegroup data. It does,
however, share the same concepts like the 4 byte header which identifies
the type of data that follows and the 2 byte abbreviation for
compression types (of which only "UN" is currently supported).
The new bundle format is essentially the existing stream clone version 1
data format with some headers at the beginning.
Content negotiation at stream clone request time checked for repository
format/requirements compatibility before initiating a stream clone. We
can't do active content negotiation when using clone bundles. So, we put
this set of requirements inside the payload so consumers have a built-in
mechanism for checking compatibility before reading and applying lots of
data. Of course, we will also advertise this requirements set in clone
bundles. But that's for another patch.
We currently don't have a mechanism to produce and consume this new
bundle format. This will be implemented in upcoming patches.
It's worth noting that if a legacy client attempts to `hg unbundle` a
stream clone bundle (with the "HGS1" header), it will abort with:
"unknown bundle version S1," which seems appropriate.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 17 Oct 2015 11:14:52 -0700 |
parents | b1a0c534d9b4 |
children | 75d550b7d8f5 |
rev | line source |
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1 # repair.py - functions for repository repair for mercurial |
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2 # |
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3 # Copyright 2005, 2006 Chris Mason <mason@suse.com> |
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4 # Copyright 2007 Matt Mackall |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from __future__ import absolute_import |
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10 |
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11 import errno |
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12 |
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13 from .i18n import _ |
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14 from .node import short |
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15 from . import ( |
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16 bundle2, |
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17 changegroup, |
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18 error, |
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19 exchange, |
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20 util, |
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21 ) |
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22 |
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23 def _bundle(repo, bases, heads, node, suffix, compress=True): |
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24 """create a bundle with the specified revisions as a backup""" |
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25 cgversion = '01' |
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26 if 'generaldelta' in repo.requirements: |
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27 cgversion = '02' |
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28 |
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29 cg = changegroup.changegroupsubset(repo, bases, heads, 'strip', |
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30 version=cgversion) |
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31 backupdir = "strip-backup" |
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32 vfs = repo.vfs |
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33 if not vfs.isdir(backupdir): |
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34 vfs.mkdir(backupdir) |
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35 |
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36 # Include a hash of all the nodes in the filename for uniqueness |
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37 allcommits = repo.set('%ln::%ln', bases, heads) |
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38 allhashes = sorted(c.hex() for c in allcommits) |
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39 totalhash = util.sha1(''.join(allhashes)).hexdigest() |
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40 name = "%s/%s-%s-%s.hg" % (backupdir, short(node), totalhash[:8], suffix) |
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41 |
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42 comp = None |
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43 if cgversion != '01': |
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44 bundletype = "HG20" |
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45 if compress: |
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46 comp = 'BZ' |
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47 elif compress: |
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48 bundletype = "HG10BZ" |
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49 else: |
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50 bundletype = "HG10UN" |
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51 return changegroup.writebundle(repo.ui, cg, name, bundletype, vfs, |
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52 compression=comp) |
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53 |
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54 def _collectfiles(repo, striprev): |
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55 """find out the filelogs affected by the strip""" |
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56 files = set() |
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57 |
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58 for x in xrange(striprev, len(repo)): |
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59 files.update(repo[x].files()) |
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60 |
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61 return sorted(files) |
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62 |
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63 def _collectbrokencsets(repo, files, striprev): |
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64 """return the changesets which will be broken by the truncation""" |
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65 s = set() |
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66 def collectone(revlog): |
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67 _, brokenset = revlog.getstrippoint(striprev) |
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68 s.update([revlog.linkrev(r) for r in brokenset]) |
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69 |
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70 collectone(repo.manifest) |
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71 for fname in files: |
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72 collectone(repo.file(fname)) |
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73 |
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74 return s |
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75 |
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76 def strip(ui, repo, nodelist, backup=True, topic='backup'): |
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77 |
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78 # Simple way to maintain backwards compatibility for this |
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79 # argument. |
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80 if backup in ['none', 'strip']: |
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81 backup = False |
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82 |
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83 repo = repo.unfiltered() |
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84 repo.destroying() |
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85 |
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86 cl = repo.changelog |
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87 # TODO handle undo of merge sets |
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88 if isinstance(nodelist, str): |
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89 nodelist = [nodelist] |
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90 striplist = [cl.rev(node) for node in nodelist] |
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91 striprev = min(striplist) |
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92 |
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93 # Some revisions with rev > striprev may not be descendants of striprev. |
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94 # We have to find these revisions and put them in a bundle, so that |
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95 # we can restore them after the truncations. |
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96 # To create the bundle we use repo.changegroupsubset which requires |
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97 # the list of heads and bases of the set of interesting revisions. |
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98 # (head = revision in the set that has no descendant in the set; |
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99 # base = revision in the set that has no ancestor in the set) |
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100 tostrip = set(striplist) |
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101 for rev in striplist: |
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102 for desc in cl.descendants([rev]): |
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103 tostrip.add(desc) |
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104 |
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105 files = _collectfiles(repo, striprev) |
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106 saverevs = _collectbrokencsets(repo, files, striprev) |
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107 |
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108 # compute heads |
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109 saveheads = set(saverevs) |
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110 for r in xrange(striprev + 1, len(cl)): |
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111 if r not in tostrip: |
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112 saverevs.add(r) |
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113 saveheads.difference_update(cl.parentrevs(r)) |
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114 saveheads.add(r) |
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115 saveheads = [cl.node(r) for r in saveheads] |
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116 |
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117 # compute base nodes |
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118 if saverevs: |
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119 descendants = set(cl.descendants(saverevs)) |
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120 saverevs.difference_update(descendants) |
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121 savebases = [cl.node(r) for r in saverevs] |
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122 stripbases = [cl.node(r) for r in tostrip] |
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123 |
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124 # For a set s, max(parents(s) - s) is the same as max(heads(::s - s)), but |
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125 # is much faster |
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126 newbmtarget = repo.revs('max(parents(%ld) - (%ld))', tostrip, tostrip) |
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127 if newbmtarget: |
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128 newbmtarget = repo[newbmtarget.first()].node() |
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129 else: |
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130 newbmtarget = '.' |
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131 |
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132 bm = repo._bookmarks |
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133 updatebm = [] |
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134 for m in bm: |
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135 rev = repo[bm[m]].rev() |
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136 if rev in tostrip: |
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137 updatebm.append(m) |
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138 |
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139 # create a changegroup for all the branches we need to keep |
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140 backupfile = None |
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141 vfs = repo.vfs |
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142 node = nodelist[-1] |
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143 if backup: |
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144 backupfile = _bundle(repo, stripbases, cl.heads(), node, topic) |
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145 repo.ui.status(_("saved backup bundle to %s\n") % |
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146 vfs.join(backupfile)) |
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147 repo.ui.log("backupbundle", "saved backup bundle to %s\n", |
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148 vfs.join(backupfile)) |
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149 if saveheads or savebases: |
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repair: do not compress partial bundle if we do not keep it on disk
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150 # do not compress partial bundle if we remove it from disk later |
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151 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', |
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152 compress=False) |
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153 |
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154 mfst = repo.manifest |
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155 |
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156 curtr = repo.currenttransaction() |
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157 if curtr is not None: |
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158 del curtr # avoid carrying reference to transaction for nothing |
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159 msg = _('programming error: cannot strip from inside a transaction') |
26587
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error: get Abort from 'error' instead of 'util'
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160 raise error.Abort(msg, hint=_('contact your extension maintainer')) |
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161 |
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162 tr = repo.transaction("strip") |
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163 offset = len(tr.entries) |
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164 |
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165 try: |
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166 tr.startgroup() |
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167 cl.strip(striprev, tr) |
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168 mfst.strip(striprev, tr) |
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169 for fn in files: |
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170 repo.file(fn).strip(striprev, tr) |
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171 tr.endgroup() |
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172 |
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173 try: |
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174 for i in xrange(offset, len(tr.entries)): |
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175 file, troffset, ignore = tr.entries[i] |
23878
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localrepo: remove all external users of localrepo.sopener
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parents:
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|
176 repo.svfs(file, 'a').truncate(troffset) |
20885
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fncache: clean up fncache during strips
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parents:
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|
177 if troffset == 0: |
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178 repo.store.markremoved(file) |
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179 tr.close() |
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180 finally: |
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181 tr.release() |
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182 |
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183 if saveheads or savebases: |
11202
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|
184 ui.note(_("adding branch\n")) |
20979
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changeset
|
185 f = vfs.open(chgrpfile, "rb") |
21064
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bundle2: add a ui argument to readbundle
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parents:
21063
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changeset
|
186 gen = exchange.readbundle(ui, f, chgrpfile, vfs) |
11202
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187 if not repo.ui.verbose: |
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188 # silence internal shuffling chatter |
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189 repo.ui.pushbuffer() |
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190 if isinstance(gen, bundle2.unbundle20): |
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191 tr = repo.transaction('strip') |
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192 tr.hookargs = {'source': 'strip', |
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193 'url': 'bundle:' + vfs.join(chgrpfile)} |
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194 try: |
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195 bundle2.processbundle(repo, gen, lambda: tr) |
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196 tr.close() |
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197 finally: |
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198 tr.release() |
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|
199 else: |
26701
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repair: use cg?unpacker.apply() instead of changegroup.addchangegroup()
Augie Fackler <augie@google.com>
parents:
26624
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200 gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True) |
11202
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201 if not repo.ui.verbose: |
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202 repo.ui.popbuffer() |
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203 f.close() |
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204 |
16237
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205 # remove undo files |
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changeset
|
206 for undovfs, undofile in repo.undofiles(): |
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207 try: |
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|
208 undovfs.unlink(undofile) |
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global: mass rewrite to use modern exception syntax
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parents:
25652
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changeset
|
209 except OSError as e: |
16237
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210 if e.errno != errno.ENOENT: |
20975
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211 ui.warn(_('error removing %s: %s\n') % |
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212 (undovfs.join(undofile), str(e))) |
16237
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213 |
13362
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|
214 for m in updatebm: |
17264
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strip: move bookmarks to nearest ancestor rather than '.'
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parents:
17013
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changeset
|
215 bm[m] = repo[newbmtarget].node() |
17922
7f5dab94e48c
bookmarks: introduce a bmstore to manage bookmark persistence
Augie Fackler <raf@durin42.com>
parents:
17796
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changeset
|
216 bm.write() |
16705
c2d9ef43ff6c
check-code: ignore naked excepts with a "re-raise" comment
Brodie Rao <brodie@sf.io>
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16628
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changeset
|
217 except: # re-raises |
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|
218 if backupfile: |
11600
76454cbc11e4
mark ui.warn strings for translation
Martin Geisler <mg@lazybytes.net>
parents:
11333
diff
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219 ui.warn(_("strip failed, full bundle stored in '%s'\n") |
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220 % vfs.join(backupfile)) |
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221 elif saveheads: |
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222 ui.warn(_("strip failed, partial bundle stored in '%s'\n") |
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223 % vfs.join(chgrpfile)) |
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224 raise |
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225 else: |
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226 if saveheads or savebases: |
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227 # Remove partial backup only if there were no exceptions |
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228 vfs.unlink(chgrpfile) |
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229 |
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230 repo.destroyed() |
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231 |
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232 def rebuildfncache(ui, repo): |
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233 """Rebuilds the fncache file from repo history. |
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234 |
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235 Missing entries will be added. Extra entries will be removed. |
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236 """ |
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237 repo = repo.unfiltered() |
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238 |
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239 if 'fncache' not in repo.requirements: |
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240 ui.warn(_('(not rebuilding fncache because repository does not ' |
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241 'support fncache)\n')) |
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242 return |
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243 |
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244 lock = repo.lock() |
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245 try: |
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246 fnc = repo.store.fncache |
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247 # Trigger load of fncache. |
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248 if 'irrelevant' in fnc: |
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249 pass |
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250 |
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251 oldentries = set(fnc.entries) |
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252 newentries = set() |
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253 seenfiles = set() |
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254 |
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255 repolen = len(repo) |
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256 for rev in repo: |
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257 ui.progress(_('changeset'), rev, total=repolen) |
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258 |
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259 ctx = repo[rev] |
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260 for f in ctx.files(): |
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261 # This is to minimize I/O. |
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262 if f in seenfiles: |
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263 continue |
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264 seenfiles.add(f) |
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265 |
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266 i = 'data/%s.i' % f |
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267 d = 'data/%s.d' % f |
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268 |
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269 if repo.store._exists(i): |
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270 newentries.add(i) |
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271 if repo.store._exists(d): |
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272 newentries.add(d) |
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273 |
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274 ui.progress(_('changeset'), None) |
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275 |
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276 addcount = len(newentries - oldentries) |
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277 removecount = len(oldentries - newentries) |
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278 for p in sorted(oldentries - newentries): |
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279 ui.write(_('removing %s\n') % p) |
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280 for p in sorted(newentries - oldentries): |
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281 ui.write(_('adding %s\n') % p) |
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282 |
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283 if addcount or removecount: |
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284 ui.write(_('%d items added, %d removed from fncache\n') % |
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285 (addcount, removecount)) |
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286 fnc.entries = newentries |
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287 fnc._dirty = True |
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288 |
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289 tr = repo.transaction('fncache') |
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290 try: |
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291 fnc.write(tr) |
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292 tr.close() |
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293 finally: |
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294 tr.release() |
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295 else: |
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296 ui.write(_('fncache already up to date\n')) |
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297 finally: |
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298 lock.release() |
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299 |
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300 def stripbmrevset(repo, mark): |
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301 """ |
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302 The revset to strip when strip is called with -B mark |
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303 |
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304 Needs to live here so extensions can use it and wrap it even when strip is |
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305 not enabled or not present on a box. |
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306 """ |
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307 return repo.revs("ancestors(bookmark(%s)) - " |
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308 "ancestors(head() and not bookmark(%s)) - " |
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309 "ancestors(bookmark() and not bookmark(%s))", |
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310 mark, mark, mark) |