author | Matt Mackall <mpm@selenic.com> |
Fri, 30 Dec 2011 17:04:36 -0600 | |
changeset 15751 | 742c766c8cea |
parent 15456 | abcaaf51d568 |
child 15901 | 73c4b3d0c711 |
permissions | -rw-r--r-- |
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# repair.py - functions for repository repair for mercurial |
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# |
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# Copyright 2005, 2006 Chris Mason <mason@suse.com> |
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# Copyright 2007 Matt Mackall |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from mercurial import changegroup, bookmarks, phases |
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from mercurial.node import short |
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from mercurial.i18n import _ |
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import os |
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def _bundle(repo, bases, heads, node, suffix, compress=True): |
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"""create a bundle with the specified revisions as a backup""" |
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cg = repo.changegroupsubset(bases, heads, 'strip') |
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backupdir = repo.join("strip-backup") |
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if not os.path.isdir(backupdir): |
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os.mkdir(backupdir) |
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name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix)) |
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if compress: |
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bundletype = "HG10BZ" |
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else: |
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bundletype = "HG10UN" |
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return changegroup.writebundle(cg, name, bundletype) |
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def _collectfiles(repo, striprev): |
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"""find out the filelogs affected by the strip""" |
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files = set() |
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for x in xrange(striprev, len(repo)): |
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files.update(repo[x].files()) |
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return sorted(files) |
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def _collectbrokencsets(repo, files, striprev): |
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"""return the changesets which will be broken by the truncation""" |
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s = set() |
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def collectone(revlog): |
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links = (revlog.linkrev(i) for i in revlog) |
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# find the truncation point of the revlog |
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for lrev in links: |
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if lrev >= striprev: |
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break |
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# see if any revision after this point has a linkrev |
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# less than striprev (those will be broken by strip) |
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for lrev in links: |
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if lrev < striprev: |
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s.add(lrev) |
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collectone(repo.manifest) |
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for fname in files: |
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collectone(repo.file(fname)) |
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return s |
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def strip(ui, repo, node, backup="all"): |
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cl = repo.changelog |
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# TODO delete the undo files, and handle undo of merge sets |
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striprev = cl.rev(node) |
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keeppartialbundle = backup == 'strip' |
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# Some revisions with rev > striprev may not be descendants of striprev. |
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# We have to find these revisions and put them in a bundle, so that |
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# we can restore them after the truncations. |
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# To create the bundle we use repo.changegroupsubset which requires |
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# the list of heads and bases of the set of interesting revisions. |
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# (head = revision in the set that has no descendant in the set; |
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# base = revision in the set that has no ancestor in the set) |
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tostrip = set(cl.descendants(striprev)) |
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tostrip.add(striprev) |
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files = _collectfiles(repo, striprev) |
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saverevs = _collectbrokencsets(repo, files, striprev) |
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# compute heads |
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saveheads = set(saverevs) |
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for r in xrange(striprev + 1, len(cl)): |
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if r not in tostrip: |
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saverevs.add(r) |
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saveheads.difference_update(cl.parentrevs(r)) |
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saveheads.add(r) |
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saveheads = [cl.node(r) for r in saveheads] |
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# compute base nodes |
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if saverevs: |
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descendants = set(cl.descendants(*saverevs)) |
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saverevs.difference_update(descendants) |
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savebases = [cl.node(r) for r in saverevs] |
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bm = repo._bookmarks |
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updatebm = [] |
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for m in bm: |
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rev = repo[bm[m]].rev() |
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if rev in tostrip: |
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updatebm.append(m) |
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# create a changegroup for all the branches we need to keep |
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backupfile = None |
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if backup == "all": |
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backupfile = _bundle(repo, [node], cl.heads(), node, 'backup') |
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repo.ui.status(_("saved backup bundle to %s\n") % backupfile) |
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if saveheads or savebases: |
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# do not compress partial bundle if we remove it from disk later |
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chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', |
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compress=keeppartialbundle) |
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108 |
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mfst = repo.manifest |
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110 |
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tr = repo.transaction("strip") |
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offset = len(tr.entries) |
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113 |
|
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try: |
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115 |
tr.startgroup() |
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116 |
cl.strip(striprev, tr) |
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117 |
mfst.strip(striprev, tr) |
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118 |
for fn in files: |
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119 |
repo.file(fn).strip(striprev, tr) |
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tr.endgroup() |
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121 |
|
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122 |
try: |
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123 |
for i in xrange(offset, len(tr.entries)): |
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124 |
file, troffset, ignore = tr.entries[i] |
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125 |
repo.sopener(file, 'a').truncate(troffset) |
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126 |
tr.close() |
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127 |
except: |
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128 |
tr.abort() |
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129 |
raise |
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130 |
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131 |
if saveheads or savebases: |
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132 |
ui.note(_("adding branch\n")) |
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f = open(chgrpfile, "rb") |
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gen = changegroup.readbundle(f, chgrpfile) |
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135 |
if not repo.ui.verbose: |
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136 |
# silence internal shuffling chatter |
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repo.ui.pushbuffer() |
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138 |
repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True) |
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139 |
if not repo.ui.verbose: |
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140 |
repo.ui.popbuffer() |
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141 |
f.close() |
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142 |
if not keeppartialbundle: |
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143 |
os.unlink(chgrpfile) |
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144 |
|
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145 |
for m in updatebm: |
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146 |
bm[m] = repo['.'].node() |
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147 |
bookmarks.write(repo) |
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148 |
# remove potential unknown phase |
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149 |
# XXX using to_strip data would be faster |
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phases.filterunknown(repo) |
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151 |
except: |
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152 |
if backupfile: |
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153 |
ui.warn(_("strip failed, full bundle stored in '%s'\n") |
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154 |
% backupfile) |
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155 |
elif saveheads: |
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156 |
ui.warn(_("strip failed, partial bundle stored in '%s'\n") |
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157 |
% chgrpfile) |
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158 |
raise |
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159 |
|
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160 |
repo.destroyed() |