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annotate mercurial/transaction.py @ 573:fbfbd4e506c3

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transaction: nullify journal after close() -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 transaction: nullify journal after close() This keeps us from trying to cleanup in __del__. bug spotted by K Thananchayan <thananck@yahoo.com> manifest hash: 1f4c5fa43d2458cdcb6ec0f0a7066b3c3e699f33 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCxwQ6ywK+sNU5EO8RAuGhAJ9+BnKILwRCF9EKlPTz2zptiysQ/QCgsB3s VKIehiStv+ibWQQi15k4mwk= =nZD1 -----END PGP SIGNATURE-----
author mpm@selenic.com
date Sat, 02 Jul 2005 13:16:42 -0800
parents 0ceea19182a9
children df8a5a0098d4
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1 # transaction.py - simple journalling scheme for mercurial
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2 #
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3 # This transaction scheme is intended to gracefully handle program
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4 # errors and interruptions. More serious failures like system crashes
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5 # can be recovered with an fsck-like tool. As the whole repository is
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6 # effectively log-structured, this should amount to simply truncating
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7 # anything that isn't referenced in the changelog.
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8 #
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9 # Copyright 2005 Matt Mackall <mpm@selenic.com>
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10 #
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11 # This software may be used and distributed according to the terms
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12 # of the GNU General Public License, incorporated herein by reference.
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13
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14 import os
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15 import util
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16
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17 class transaction:
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18 def __init__(self, opener, journal, after = None):
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19 self.journal = None
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20
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21 # abort here if the journal already exists
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22 if os.path.exists(journal):
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23 raise "journal already exists - run hg recover"
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24
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25 self.opener = opener
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26 self.after = after
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27 self.entries = []
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28 self.map = {}
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29 self.journal = journal
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30
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31 self.file = open(self.journal, "w")
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32
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33 def __del__(self):
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34 if self.journal:
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35 if self.entries: self.abort()
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36 self.file.close()
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37 try: os.unlink(self.journal)
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38 except: pass
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40 def add(self, file, offset):
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41 if file in self.map: return
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42 self.entries.append((file, offset))
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43 self.map[file] = 1
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44 # add enough data to the journal to do the truncate
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45 self.file.write("%s\0%d\n" % (file, offset))
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46 self.file.flush()
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47
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48 def close(self):
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49 self.file.close()
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50 self.entries = []
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51 if self.after:
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52 util.rename(self.journal, self.after)
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53 else:
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54 os.unlink(self.journal)
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55 self.journal = None
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56
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57 def abort(self):
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58 if not self.entries: return
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59
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60 print "transaction abort!"
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61
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62 for f, o in self.entries:
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63 try:
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64 self.opener(f, "a").truncate(o)
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65 except:
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66 print "failed to truncate", f
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68 self.entries = []
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69
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70 print "rollback completed"
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71
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72 def rollback(opener, file):
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73 for l in open(file).readlines():
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74 f, o = l.split('\0')
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75 opener(f, "a").truncate(int(o))
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76 os.unlink(file)
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