Mercurial > hg
annotate mercurial/transaction.py @ 6139:989467e8e3a9
Fix bad behaviour when specifying an invalid date (issue700)
commit (aborts _after_ typing in a commit message)
backout (aborted after the initial revert)
tag (edited .hgtags and couldn't commit)
import (patch applied, then commit fails)
qnew (aborts on bad dates, but writes any valid date into the # Date header)
qrefresh (like qnew)
sign (like tag)
fetch (merge, merge, merge, merge, abort)
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sun, 17 Feb 2008 21:34:28 +0100 |
parents | 53ed9b40cfc4 |
children | c9b8f2820bc0 |
rev | line source |
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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 # |
2859 | 9 # Copyright 2005, 2006 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 |
3891 | 14 from i18n import _ |
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15 import os |
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16 |
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17 class transaction(object): |
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18 def __init__(self, report, opener, journal, after=None, createmode=None): |
162 | 19 self.journal = None |
20 | |
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21 self.count = 1 |
582 | 22 self.report = report |
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23 self.opener = opener |
95 | 24 self.after = after |
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25 self.entries = [] |
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26 self.map = {} |
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27 self.journal = journal |
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28 |
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29 self.file = open(self.journal, "w") |
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30 if createmode is not None: |
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31 os.chmod(self.journal, createmode & 0666) |
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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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39 |
2084 | 40 def add(self, file, offset, data=None): |
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41 if file in self.map: return |
2084 | 42 self.entries.append((file, offset, data)) |
43 self.map[file] = len(self.entries) - 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 |
2084 | 48 def find(self, file): |
49 if file in self.map: | |
50 return self.entries[self.map[file]] | |
51 return None | |
52 | |
53 def replace(self, file, offset, data=None): | |
54 if file not in self.map: | |
55 raise KeyError(file) | |
56 index = self.map[file] | |
57 self.entries[index] = (file, offset, data) | |
58 self.file.write("%s\0%d\n" % (file, offset)) | |
59 self.file.flush() | |
60 | |
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61 def nest(self): |
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62 self.count += 1 |
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63 return self |
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64 |
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65 def running(self): |
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66 return self.count > 0 |
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67 |
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68 def close(self): |
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69 self.count -= 1 |
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70 if self.count != 0: |
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71 return |
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72 self.file.close() |
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73 self.entries = [] |
95 | 74 if self.after: |
785 | 75 self.after() |
95 | 76 else: |
77 os.unlink(self.journal) | |
573 | 78 self.journal = None |
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79 |
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80 def abort(self): |
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81 if not self.entries: return |
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82 |
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83 self.report(_("transaction abort!\n")) |
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84 |
2084 | 85 for f, o, ignore in self.entries: |
108 | 86 try: |
87 self.opener(f, "a").truncate(o) | |
88 except: | |
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89 self.report(_("failed to truncate %s\n") % f) |
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90 |
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91 self.entries = [] |
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92 |
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93 self.report(_("rollback completed\n")) |
515 | 94 |
162 | 95 def rollback(opener, file): |
2084 | 96 files = {} |
162 | 97 for l in open(file).readlines(): |
98 f, o = l.split('\0') | |
2084 | 99 files[f] = o |
100 for f in files: | |
101 o = files[f] | |
162 | 102 opener(f, "a").truncate(int(o)) |
103 os.unlink(file) | |
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104 |