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Viewing changes to bzrlib/upgrade.py

  • Committer: Aaron Bentley
  • Date: 2007-06-20 22:06:22 UTC
  • mto: (2520.5.2 bzr.mpbundle)
  • mto: This revision was merged to the branch mainline in revision 2631.
  • Revision ID: abentley@panoramicfeedback.com-20070620220622-9lasxr96rr0e0xvn
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bzrlib/upgrade.py
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# Copyright (C) 2004, 2005 by Martin Pool
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# Copyright (C) 2005 by Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import tempfile, os, errno
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import bzrlib.errors
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import bzrlib.progress
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from bzrlib.xml import serializer_v4
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def upgrade(branch):
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    """
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    Upgrade branch to current format.
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    This causes objects to be rewritten into the current format.
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    If they change, their SHA-1 will of course change, which might
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    break any later signatures, or backreferences that check the
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    SHA-1.
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    TODO: Check non-mainline revisions.
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    """
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    import sys
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    from bzrlib.trace import mutter
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    from bzrlib.errors import BzrCheckError
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    import bzrlib.ui
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    branch.lock_write()
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    pb = bzrlib.ui.ui_factory.progress_bar()
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    try:
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        last_rev_id = None
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        history = branch.revision_history()
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        revno = 0
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        revcount = len(history)
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        updated_revisions = []
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        # Set to True in the case that the previous revision entry
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        # was updated, since this will affect future revision entries
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        updated_previous_revision = False
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        for rev_id in history:
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            revno += 1
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            pb.update('upgrading revision', revno, revcount)
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            rev = branch.get_revision(rev_id)
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            if rev.revision_id != rev_id:
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                raise BzrCheckError('wrong internal revision id in revision {%s}'
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                                    % rev_id)
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            last_rev_id = rev_id
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            # if set to true, revision must be written out
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            updated = False
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            if rev.inventory_sha1 is None:
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                rev.inventory_sha1 = branch.get_inventory_sha1(rev_id)
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                updated = True
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                mutter("  set inventory_sha1 on {%s}" % rev_id)
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            for prr in rev.parents:
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                try:
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                    actual_sha1 = branch.get_revision_sha1(prr.revision_id)
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                except bzrlib.errors.NoSuchRevision:
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                    mutter("parent {%s} of {%s} not present in branch; skipped"
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                           % (prr.revision_id, rev_id))
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                    continue
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                if actual_sha1 != prr.revision_sha1:
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                    mutter("parent {%s} of {%s} sha1 mismatch: "
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                           "%s vs %s; fixed"
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                           % (prr.revision_id, rev_id,
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                              actual_sha1, prr.revision_sha1))
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                    prr.revision_sha1 = actual_sha1
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                    updated = True
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            if updated:
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                updated_previous_revision = True
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                # We had to update this revision entries hashes
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                # Now we need to write out a new value
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                # This is a little bit invasive, since we are *rewriting* a
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                # revision entry. I'm not supremely happy about it, but
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                # there should be *some* way of making old entries have
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                # the full meta information.
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                rev_tmp = tempfile.TemporaryFile()
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                serializer_v4.write_revision(rev, rev_tmp)
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                rev_tmp.seek(0)
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                tmpfd, tmp_path = tempfile.mkstemp(prefix=rev_id, suffix='.gz',
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                    dir=branch.controlfilename('revision-store'))
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                os.close(tmpfd)
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                def special_rename(p1, p2):
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                    if sys.platform == 'win32':
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                        try:
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                            os.remove(p2)
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                        except OSError, e:
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                            if e.errno != errno.ENOENT:
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                                raise
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                    os.rename(p1, p2)
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                try:
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                    # TODO: We may need to handle the case where the old revision
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                    # entry was not compressed (and thus did not end with .gz)
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                    # Remove the old revision entry out of the way
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                    rev_path = branch.controlfilename(['revision-store', rev_id+'.gz'])
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                    special_rename(rev_path, tmp_path)
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                    branch.revision_store.add(rev_tmp, rev_id) # Add the new one
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                    os.remove(tmp_path) # Remove the old name
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                    mutter('    Updated revision entry {%s}' % rev_id)
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                except:
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                    # On any exception, restore the old entry
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                    special_rename(tmp_path, rev_path)
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                    raise
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                rev_tmp.close()
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                updated_revisions.append(rev_id)
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            else:
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                updated_previous_revision = False
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    finally:
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        branch.unlock()
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    pb.clear()
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    if updated_revisions:
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        print '%d revisions updated to current format' % len(updated_revisions)