view mercurial/changelog.py @ 2002:4aab906517c6

Calling revlog.addgroup with an empty changegroup now raises RevlogError.
The empty changegroup can be caused by remote servers dying soon after
findincoming, and further code in pull assumes (correctly) that there are
new changesets.

# changelog.py - changelog class for mercurial
#
# Copyright 2005 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

from revlog import *
from i18n import gettext as _
from demandload import demandload
demandload(globals(), "os time util")

class changelog(revlog):
    def __init__(self, opener):
        revlog.__init__(self, opener, "00changelog.i", "00changelog.d")

    def extract(self, text):
        if not text:
            return (nullid, "", (0, 0), [], "")
        last = text.index("\n\n")
        desc = text[last + 2:]
        l = text[:last].splitlines()
        manifest = bin(l[0])
        user = l[1]
        date = l[2].split(' ')
        time = float(date.pop(0))
        try:
            # various tools did silly things with the time zone field.
            timezone = int(date[0])
        except:
            timezone = 0
        files = l[3:]
        return (manifest, user, (time, timezone), files, desc)

    def read(self, node):
        return self.extract(self.revision(node))

    def add(self, manifest, list, desc, transaction, p1=None, p2=None,
                  user=None, date=None):
        if date:
            # validate explicit (probably user-specified) date and
            # time zone offset. values must fit in signed 32 bits for
            # current 32-bit linux runtimes.
            try:
                when, offset = map(int, date.split(' '))
            except ValueError:
                raise ValueError(_('invalid date: %r') % date)
            if abs(when) > 0x7fffffff:
                raise ValueError(_('date exceeds 32 bits: %d') % when)
            if abs(offset) >= 43200:
                raise ValueError(_('impossible time zone offset: %d') % offset)
        else:
            date = "%d %d" % util.makedate()
        list.sort()
        l = [hex(manifest), user, date] + list + ["", desc]
        text = "\n".join(l)
        return self.addrevision(text, transaction, self.count(), p1, p2)