Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/transaction.py @ 687:44b30755d07c
Hide file hashes in log
There are six different kinds of revision numbers and hashes:
changeset hash and local number
manifest hash and local number
file hash and local number
We really ought to expose only the changeset hash and local number, so
begin hiding the others from the end user
manifest hash: 40d07cc930e84a9283d5e03ade23e3454401e148
author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 12 Jul 2005 20:55:42 -0800 |
parents | df8a5a0098d4 |
children | 46a8dd3145cc 445970ccf57a |
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# 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)