Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/transaction.py @ 562:be6233a2bfdd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
hg clone: only use the absolute path for .hg/hgrc -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 hg clone: only use the absolute path for .hg/hgrc manifest hash: 7fb6a265249a3c910c0321eb1efc61c38429ac91 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCxZ5mywK+sNU5EO8RApIwAJwKdex+GwoflS8vKY9h7qA1F4/Z8wCgjkWH VsKsuPsM97sluArdDZLZsbs= =0g6X -----END PGP SIGNATURE-----
author mpm@selenic.com
date Fri, 01 Jul 2005 11:49:58 -0800
parents 0ceea19182a9
children fbfbd4e506c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
1 # transaction.py - simple journalling scheme for mercurial
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
2 #
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
3 # This transaction scheme is intended to gracefully handle program
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
4 # errors and interruptions. More serious failures like system crashes
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
5 # can be recovered with an fsck-like tool. As the whole repository is
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
6 # effectively log-structured, this should amount to simply truncating
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
7 # anything that isn't referenced in the changelog.
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
8 #
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
9 # Copyright 2005 Matt Mackall <mpm@selenic.com>
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
10 #
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
11 # This software may be used and distributed according to the terms
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
12 # of the GNU General Public License, incorporated herein by reference.
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
13
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
14 import os
421
43b8da7420a9 [PATCH] rename under the other OS
mpm@selenic.com
parents: 162
diff changeset
15 import util
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
16
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
17 class transaction:
95
589f507bb259 Beginnings of transaction undo support
mpm@selenic.com
parents: 43
diff changeset
18 def __init__(self, opener, journal, after = None):
162
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
19 self.journal = None
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
20
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
21 # abort here if the journal already exists
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
22 if os.path.exists(journal):
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
23 raise "journal already exists - run hg recover"
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
24
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
25 self.opener = opener
95
589f507bb259 Beginnings of transaction undo support
mpm@selenic.com
parents: 43
diff changeset
26 self.after = after
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
27 self.entries = []
42
91f1fa847158 Fix multiple changes to file per transaction
mpm@selenic.com
parents: 13
diff changeset
28 self.map = {}
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
29 self.journal = journal
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
30
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
31 self.file = open(self.journal, "w")
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
32
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
33 def __del__(self):
558
0ceea19182a9 transaction: __del__ should do nothing if the journal already exists
mpm@selenic.com
parents: 515
diff changeset
34 if self.journal:
0ceea19182a9 transaction: __del__ should do nothing if the journal already exists
mpm@selenic.com
parents: 515
diff changeset
35 if self.entries: self.abort()
0ceea19182a9 transaction: __del__ should do nothing if the journal already exists
mpm@selenic.com
parents: 515
diff changeset
36 self.file.close()
0ceea19182a9 transaction: __del__ should do nothing if the journal already exists
mpm@selenic.com
parents: 515
diff changeset
37 try: os.unlink(self.journal)
0ceea19182a9 transaction: __del__ should do nothing if the journal already exists
mpm@selenic.com
parents: 515
diff changeset
38 except: pass
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
39
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
40 def add(self, file, offset):
42
91f1fa847158 Fix multiple changes to file per transaction
mpm@selenic.com
parents: 13
diff changeset
41 if file in self.map: return
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
42 self.entries.append((file, offset))
42
91f1fa847158 Fix multiple changes to file per transaction
mpm@selenic.com
parents: 13
diff changeset
43 self.map[file] = 1
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
44 # add enough data to the journal to do the truncate
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
45 self.file.write("%s\0%d\n" % (file, offset))
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
46 self.file.flush()
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
47
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
48 def close(self):
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
49 self.file.close()
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
50 self.entries = []
95
589f507bb259 Beginnings of transaction undo support
mpm@selenic.com
parents: 43
diff changeset
51 if self.after:
421
43b8da7420a9 [PATCH] rename under the other OS
mpm@selenic.com
parents: 162
diff changeset
52 util.rename(self.journal, self.after)
95
589f507bb259 Beginnings of transaction undo support
mpm@selenic.com
parents: 43
diff changeset
53 else:
589f507bb259 Beginnings of transaction undo support
mpm@selenic.com
parents: 43
diff changeset
54 os.unlink(self.journal)
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
55
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
56 def abort(self):
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
57 if not self.entries: return
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
58
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
59 print "transaction abort!"
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
60
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
61 for f, o in self.entries:
108
8d55c2d72c7c Warn if we fail to truncate something
mpm@selenic.com
parents: 95
diff changeset
62 try:
8d55c2d72c7c Warn if we fail to truncate something
mpm@selenic.com
parents: 95
diff changeset
63 self.opener(f, "a").truncate(o)
8d55c2d72c7c Warn if we fail to truncate something
mpm@selenic.com
parents: 95
diff changeset
64 except:
8d55c2d72c7c Warn if we fail to truncate something
mpm@selenic.com
parents: 95
diff changeset
65 print "failed to truncate", f
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
66
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
67 self.entries = []
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
68
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
69 print "rollback completed"
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 429
diff changeset
70
162
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
71 def rollback(opener, file):
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
72 for l in open(file).readlines():
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
73 f, o = l.split('\0')
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
74 opener(f, "a").truncate(int(o))
5dcbe4d9a30c Implement recover and undo commands
mpm@selenic.com
parents: 108
diff changeset
75 os.unlink(file)
0
9117c6561b0b Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff changeset
76