Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/transaction.py @ 704:5ca319a641e1
Make makelock and readlock work on filesystems without symlink support.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Make makelock and readlock work on filesystems without symlink support.
This way you can have a repository on a fat partiton, e.g. a USB stick.
manifest hash: cea2c120ef2b25a50c5d98b59648f773feefe470
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
iD8DBQFC1t5yW7P1GVgWeRoRAsKjAJ9BFcn/EqBK/dmJ4BY1pPIZIbDDJACghN3p
VCQS6CJ72MHpzhOOsnOpHzE=
=laDT
-----END PGP SIGNATURE-----
author | Thomas Arendsen Hein <thomas@intevation.de> |
---|---|
date | Thu, 14 Jul 2005 22:51:47 +0100 |
parents | df8a5a0098d4 |
children | 46a8dd3145cc 445970ccf57a |
line wrap: on
line source
# transaction.py - simple journalling scheme for mercurial # # This transaction scheme is intended to gracefully handle program # errors and interruptions. More serious failures like system crashes # can be recovered with an fsck-like tool. As the whole repository is # effectively log-structured, this should amount to simply truncating # anything that isn't referenced in the changelog. # # Copyright 2005 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms # of the GNU General Public License, incorporated herein by reference. import os import util class transaction: def __init__(self, report, opener, journal, after = None): self.journal = None # abort here if the journal already exists if os.path.exists(journal): raise "journal already exists - run hg recover" self.report = report self.opener = opener self.after = after self.entries = [] self.map = {} self.journal = journal self.file = open(self.journal, "w") def __del__(self): if self.journal: if self.entries: self.abort() self.file.close() try: os.unlink(self.journal) except: pass def add(self, file, offset): if file in self.map: return self.entries.append((file, offset)) self.map[file] = 1 # add enough data to the journal to do the truncate self.file.write("%s\0%d\n" % (file, offset)) self.file.flush() def close(self): self.file.close() self.entries = [] if self.after: util.rename(self.journal, self.after) else: os.unlink(self.journal) self.journal = None def abort(self): if not self.entries: return self.report("transaction abort!\n") for f, o in self.entries: try: self.opener(f, "a").truncate(o) except: self.report("failed to truncate %s\n" % f) self.entries = [] self.report("rollback completed\n") def rollback(opener, file): for l in open(file).readlines(): f, o = l.split('\0') opener(f, "a").truncate(int(o)) os.unlink(file)