Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/transaction.py @ 220:3113a94c1bff
change dircache into dirstate
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change dircache into dirstate
The dircache now tracks adds and removes directly
diffdir now makes a proper distinction between added and unknown files
Add a forget command to unadd files
Undo tries to fix up the state of just the files in the undone commit
Add and remove complain about files that are not in a proper state of
existence
manifest hash: ca0cd6abc5e119670acf11a54fefa2bc986eadf3
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author | mpm@selenic.com |
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date | Thu, 02 Jun 2005 17:39:29 -0800 |
parents | 5dcbe4d9a30c |
children | 43b8da7420a9 688d03d6997a |
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 # |
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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 |
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16 class transaction: |
95 | 17 def __init__(self, opener, journal, after = None): |
162 | 18 self.journal = None |
19 | |
20 # abort here if the journal already exists | |
21 if os.path.exists(journal): | |
22 raise "journal already exists - run hg recover" | |
23 | |
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24 self.opener = opener |
95 | 25 self.after = after |
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26 self.entries = [] |
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27 self.map = {} |
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28 self.journal = journal |
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29 |
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30 self.file = open(self.journal, "w") |
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31 |
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32 def __del__(self): |
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33 if self.entries: self.abort() |
13 | 34 try: os.unlink(self.journal) |
35 except: pass | |
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36 |
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37 def add(self, file, offset): |
42
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38 if file in self.map: return |
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39 self.entries.append((file, offset)) |
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40 self.map[file] = 1 |
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41 # add enough data to the journal to do the truncate |
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42 self.file.write("%s\0%d\n" % (file, offset)) |
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43 self.file.flush() |
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44 |
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45 def close(self): |
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46 self.file.close() |
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47 self.entries = [] |
95 | 48 if self.after: |
49 os.rename(self.journal, self.after) | |
50 else: | |
51 os.unlink(self.journal) | |
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52 |
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53 def abort(self): |
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54 if not self.entries: return |
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55 |
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56 print "transaction abort!" |
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57 |
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58 for f, o in self.entries: |
108 | 59 try: |
60 self.opener(f, "a").truncate(o) | |
61 except: | |
62 print "failed to truncate", f | |
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63 |
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64 self.entries = [] |
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65 |
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66 print "rollback completed" |
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67 |
162 | 68 def rollback(opener, file): |
69 for l in open(file).readlines(): | |
70 f, o = l.split('\0') | |
71 opener(f, "a").truncate(int(o)) | |
72 os.unlink(file) | |
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73 |