/brz/remove-bazaar

# Copyright (C) 2004, 2005 by Martin Pool

# Copyright (C) 2005 by Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

def upgrade(branch):

    """

    Upgrade branch to current format.

    This causes objects to be rewritten into the current format.

    If they change, their SHA-1 will of course change, which might

    break any later signatures, or backreferences that check the

    SHA-1.

    """

    import sys

    from bzrlib.trace import mutter

    from bzrlib.errors import BzrCheckError

    from bzrlib.progress import ProgressBar

    branch.lock_write()

    try:

        pb = ProgressBar(show_spinner=True)

        last_ptr = None

        checked_revs = {}

        history = branch.revision_history()

        revno = 0

        revcount = len(history)

        updated_revisions = []

        # Set to True in the case that the previous revision entry

        # was updated, since this will affect future revision entries

        updated_previous_revision = False

        for rid in history:

            revno += 1

            pb.update('upgrading revision', revno, revcount)

            mutter('    revision {%s}' % rid)

            rev = branch.get_revision(rid)

            if rev.revision_id != rid:

                raise BzrCheckError('wrong internal revision id in revision {%s}' % rid)

            if rev.precursor != last_ptr:

                raise BzrCheckError('mismatched precursor in revision {%s}' % rid)

            last_ptr = rid

            if rid in checked_revs:

                raise BzrCheckError('repeated revision {%s}' % rid)

            checked_revs[rid] = True

            ## TODO: Check all the required fields are present on the revision.

            updated = False

            if rev.inventory_sha1:

                #mutter('    checking inventory hash {%s}' % rev.inventory_sha1)

                inv_sha1 = branch.get_inventory_sha1(rev.inventory_id)

                if inv_sha1 != rev.inventory_sha1:

                    raise BzrCheckError('Inventory sha1 hash doesn\'t match'

                        ' value in revision {%s}' % rid)

            else:

                inv_sha1 = branch.get_inventory_sha1(rev.inventory_id)

                rev.inventory_sha1 = inv_sha1

                updated = True

            if rev.precursor:

                if rev.precursor_sha1:

                    precursor_sha1 = branch.get_revision_sha1(rev.precursor)

                    if updated_previous_revision: 

                        # we don't expect the hashes to match, because

                        # we had to modify the previous revision_history entry.

                        rev.precursor_sha1 = precursor_sha1

                        updated = True

                    else:

                        #mutter('    checking precursor hash {%s}' % rev.precursor_sha1)

                        if rev.precursor_sha1 != precursor_sha1:

                            raise BzrCheckError('Precursor sha1 hash doesn\'t match'

                                ' value in revision {%s}' % rid)

                else:

                    precursor_sha1 = branch.get_revision_sha1(rev.precursor)

                    rev.precursor_sha1 = precursor_sha1

                    updated = True

            if updated:

                updated_previous_revision = True

                # We had to update this revision entries hashes

                # Now we need to write out a new value

                # This is a little bit invasive, since we are *rewriting* a

                # revision entry. I'm not supremely happy about it, but

                # there should be *some* way of making old entries have

                # the full meta information.

                import tempfile, os, errno

                rev_tmp = tempfile.TemporaryFile()

                rev.write_xml(rev_tmp)

                rev_tmp.seek(0)

                tmpfd, tmp_path = tempfile.mkstemp(prefix=rid, suffix='.gz',

                    dir=branch.controlfilename('revision-store'))

                os.close(tmpfd)

                def special_rename(p1, p2):

                    if sys.platform == 'win32':

                        try:

                            os.remove(p2)

                        except OSError, e:

                            if e.errno != errno.ENOENT:

                                raise

                    os.rename(p1, p2)

                try:

                    # TODO: We may need to handle the case where the old revision

                    # entry was not compressed (and thus did not end with .gz)

                    # Remove the old revision entry out of the way

                    rev_path = branch.controlfilename(['revision-store', rid+'.gz'])

                    special_rename(rev_path, tmp_path)

                    branch.revision_store.add(rev_tmp, rid) # Add the new one

                    os.remove(tmp_path) # Remove the old name

                    mutter('    Updated revision entry {%s}' % rid)

                except:

                    # On any exception, restore the old entry

                    special_rename(tmp_path, rev_path)

                    raise

                rev_tmp.close()

                updated_revisions.append(rid)

            else:

                updated_previous_revision = False

    finally:

        branch.unlock()

    pb.clear()

    if updated_revisions:

        print '%d revisions updated to current format' % len(updated_revisions)