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annotate mercurial/branchmap.py @ 18118:e70ff1e599f4

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branchmap: extract read logic from repo
author Pierre-Yves David <pierre-yves.david@logilab.fr>
date Wed, 19 Dec 2012 14:46:57 +0100
parents 526e7ec5c96e
children 88990d3e3d75
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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bcee63733aad branchmap: create a mercurial.branchmap module
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1 # branchmap.py - logic to computes, maintain and stores branchmap for local repo
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from node import bin, hex, nullid, nullrev
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9 import encoding
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10
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11 def read(repo):
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12 partial = {}
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13 try:
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14 f = repo.opener("cache/branchheads")
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15 lines = f.read().split('\n')
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16 f.close()
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17 except (IOError, OSError):
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18 return {}, nullid, nullrev
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19
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20 try:
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21 last, lrev = lines.pop(0).split(" ", 1)
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22 last, lrev = bin(last), int(lrev)
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23 if lrev >= len(repo) or repo[lrev].node() != last:
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24 # invalidate the cache
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25 raise ValueError('invalidating branch cache (tip differs)')
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26 for l in lines:
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27 if not l:
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28 continue
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29 node, label = l.split(" ", 1)
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30 label = encoding.tolocal(label.strip())
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31 if not node in repo:
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32 raise ValueError('invalidating branch cache because node '+
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33 '%s does not exist' % node)
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34 partial.setdefault(label, []).append(bin(node))
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35 except KeyboardInterrupt:
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36 raise
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37 except Exception, inst:
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38 if repo.ui.debugflag:
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39 repo.ui.warn(str(inst), '\n')
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40 partial, last, lrev = {}, nullid, nullrev
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41 return partial, last, lrev
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42
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43 def write(repo, branches, tip, tiprev):
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44 try:
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45 f = repo.opener("cache/branchheads", "w", atomictemp=True)
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46 f.write("%s %s\n" % (hex(tip), tiprev))
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47 for label, nodes in branches.iteritems():
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48 for node in nodes:
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49 f.write("%s %s\n" % (hex(node), encoding.fromlocal(label)))
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50 f.close()
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51 except (IOError, OSError):
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52 pass