Mercurial > hg
annotate mercurial/transaction.py @ 6771:f5d7cfcbb4d3
workingctx: add __contains__ method
author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 11 Jul 2008 18:46:02 -0500 |
parents | c9b8f2820bc0 |
children | 618140c75d8d |
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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') | |
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99 files[f] = int(o) |
2084 | 100 for f in files: |
101 o = files[f] | |
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102 if o: |
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103 opener(f, "a").truncate(int(o)) |
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104 else: |
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105 fn = opener(f).name |
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106 os.unlink(fn) |
162 | 107 os.unlink(file) |
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108 |