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annotate mercurial/phases.py @ 15454:5a7dde5adec8

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phases: add a moveboundary function to move phases boundaries Also include logic to detect when to write phases data.
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Mon, 07 Nov 2011 14:11:01 +0100
parents ccb7de21625a
children abcaaf51d568
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
15417
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1 # Mercurial phases support code
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2 #
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3 # Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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5 # Augie Fackler <durin42@gmail.com>
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6 #
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7 # This software may be used and distributed according to the terms of the
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8 # GNU General Public License version 2 or any later version.
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9
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10 import errno
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11 from node import nullid, bin, hex
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12
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13 allphases = range(2)
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14 trackedphases = allphases[1:]
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15
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16 def readroots(repo):
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17 """Read phase roots from disk"""
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18 roots = [set() for i in allphases]
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19 roots[0].add(nullid)
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20 try:
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21 f = repo.sopener('phaseroots')
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22 try:
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23 for line in f:
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24 phase, nh = line.strip().split()
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25 roots[int(phase)].add(bin(nh))
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26 finally:
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27 f.close()
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28 except IOError, inst:
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29 if inst.errno != errno.ENOENT:
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30 raise
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31 return roots
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32
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33 def writeroots(repo):
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34 """Write phase roots from disk"""
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35 f = repo.sopener('phaseroots', 'w', atomictemp=True)
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36 try:
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37 for phase, roots in enumerate(repo._phaseroots):
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38 for h in roots:
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39 f.write('%i %s\n' % (phase, hex(h)))
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40 repo._dirtyphases = False
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41 finally:
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42 f.close()
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43
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44 def moveboundary(repo, target_phase, nodes):
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45 """Add nodes to a phase changing other nodes phases if necessary.
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46
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47 Simplify boundary to contains phase roots only."""
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48
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49 # move roots of lower states
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50 for phase in xrange(target_phase + 1, len(allphases)):
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51 # filter nodes that are not in a compatible phase already
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52 # XXX rev phase cache might have been invalidated by a previous loop
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53 # XXX we need to be smarter here
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54 nodes = [n for n in nodes if repo[n].phase() >= phase]
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55 if not nodes:
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56 break # no roots to move anymore
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57 roots = repo._phaseroots[phase]
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58 olds = roots.copy()
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59 ctxs = list(repo.set('roots((%ln::) - (%ln::%ln))', olds, olds, nodes))
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60 roots.clear()
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61 roots.update(ctx.node() for ctx in ctxs)
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62 if olds != roots:
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63 # invalidate cache (we probably could be smarter here
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64 if '_phaserev' in vars(repo):
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65 del repo._phaserev
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66 repo._dirtyphases = True