Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/transaction.py @ 1450:199bb2b4ed4a
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author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 25 Oct 2005 16:31:38 -0700 |
parents | 9d2c2e6b32b5 |
children | bf4e7ef08741 |
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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 |
421 | 15 import util |
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16 from i18n import gettext as _ |
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17 |
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18 class transaction: |
1062 | 19 def __init__(self, report, opener, journal, after=None): |
162 | 20 self.journal = None |
21 | |
22 # abort here if the journal already exists | |
23 if os.path.exists(journal): | |
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24 raise AssertionError(_("journal already exists - run hg recover")) |
162 | 25 |
582 | 26 self.report = report |
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27 self.opener = opener |
95 | 28 self.after = after |
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29 self.entries = [] |
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30 self.map = {} |
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31 self.journal = journal |
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32 |
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33 self.file = open(self.journal, "w") |
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34 |
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35 def __del__(self): |
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36 if self.journal: |
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37 if self.entries: self.abort() |
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38 self.file.close() |
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39 try: os.unlink(self.journal) |
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40 except: pass |
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41 |
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42 def add(self, file, offset): |
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43 if file in self.map: return |
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44 self.entries.append((file, offset)) |
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45 self.map[file] = 1 |
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46 # add enough data to the journal to do the truncate |
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47 self.file.write("%s\0%d\n" % (file, offset)) |
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48 self.file.flush() |
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49 |
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50 def close(self): |
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51 self.file.close() |
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52 self.entries = [] |
95 | 53 if self.after: |
785 | 54 self.after() |
95 | 55 else: |
56 os.unlink(self.journal) | |
573 | 57 self.journal = None |
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58 |
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59 def abort(self): |
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60 if not self.entries: return |
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61 |
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62 self.report(_("transaction abort!\n")) |
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63 |
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64 for f, o in self.entries: |
108 | 65 try: |
66 self.opener(f, "a").truncate(o) | |
67 except: | |
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68 self.report(_("failed to truncate %s\n") % f) |
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69 |
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70 self.entries = [] |
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71 |
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72 self.report(_("rollback completed\n")) |
515 | 73 |
162 | 74 def rollback(opener, file): |
75 for l in open(file).readlines(): | |
76 f, o = l.split('\0') | |
77 opener(f, "a").truncate(int(o)) | |
78 os.unlink(file) | |
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79 |