Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/transaction.py @ 1959:d53a18f592be
add -f/--force to pull, incoming, outgoing, to work on unrelated repo.
before this, push would not push from e.g. "hg" repo to "kernel" repo
but other commands worked. this was bad idea, could merge unrelated
projects by accident. i did this tonight.
now, all commands still work with unrelated repo but need
--force/-f. abort is default. this is safer.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Tue, 14 Mar 2006 22:58:14 -0800 |
parents | a2c69737e65e |
children | d66278012853 |
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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 from i18n import gettext as _ class transaction(object): def __init__(self, report, opener, journal, after=None): self.journal = None # abort here if the journal already exists if os.path.exists(journal): raise AssertionError(_("journal already exists - run hg recover")) 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") 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 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 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)