Mercurial > hg
view mercurial/transaction.py @ 7415:6163ef936a00
protocol: use changegroupsubset() if possible (issue1389)
Due to the fix to the pull race, to avoid sending unnecessary
changesets, use changegroupsubset if possible.
This will increase the load on the server.
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
---|---|
date | Tue, 25 Nov 2008 23:26:33 +0100 |
parents | 866d2715aff5 |
children | 9f14b66830a8 |
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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, 2006 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. from i18n import _ import os, errno class transaction(object): def __init__(self, report, opener, journal, after=None, createmode=None): self.journal = None self.count = 1 self.report = report self.opener = opener self.after = after self.entries = [] self.map = {} self.journal = journal self.file = open(self.journal, "w") if createmode is not None: os.chmod(self.journal, createmode & 0666) 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, data=None): if file in self.map: return self.entries.append((file, offset, data)) self.map[file] = len(self.entries) - 1 # add enough data to the journal to do the truncate self.file.write("%s\0%d\n" % (file, offset)) self.file.flush() def find(self, file): if file in self.map: return self.entries[self.map[file]] return None def replace(self, file, offset, data=None): if file not in self.map: raise KeyError(file) index = self.map[file] self.entries[index] = (file, offset, data) self.file.write("%s\0%d\n" % (file, offset)) self.file.flush() def nest(self): self.count += 1 return self def running(self): return self.count > 0 def close(self): self.count -= 1 if self.count != 0: return self.file.close() self.entries = [] if self.after: 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, ignore 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): files = {} for l in open(file).readlines(): f, o = l.split('\0') files[f] = int(o) for f in files: o = files[f] if o: opener(f, "a").truncate(int(o)) else: try: fn = opener(f).name os.unlink(fn) except OSError, inst: if inst.errno != errno.ENOENT: raise os.unlink(file)