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# Copyright (C) 2010 Jelmer Vernooij <jelmer@samba.org>
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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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"""Roundtripping support.
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Bazaar stores more data than Git, which means that in order to preserve
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a commit when it is pushed from Bazaar into Git we have to stash
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that extra metadata somewhere.
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There are two kinds of metadata relevant here:
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* per-file metadata (stored by revision+path)
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- usually stored per tree
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* per-revision metadata (stored by git commit id)
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Bazaar revisions have the following information that is not
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present in Git commits:
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* path last changed revisions [1]
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[1] path last changed revision information can usually
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be induced from the existing history, unless
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ghost revisions are involved.
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This extra metadata is stored in so-called "supplements":
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from bzrlib import osutils
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from cStringIO import StringIO
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class CommitSupplement(object):
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"""Supplement for a Bazaar revision roundtripped into Git.
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:ivar revision_id: Revision id, as string
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:ivar properties: Revision properties, as dictionary
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:ivar explicit_parent_ids: Parent ids (needed if there are ghosts)
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:ivar verifiers: Verifier information
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explicit_parent_ids = None
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def __nonzero__(self):
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return bool(self.revision_id or self.properties or self.explicit_parent_ids)
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class TreeSupplement(object):
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"""Supplement for a Bazaar tree roundtripped into Git.
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This provides file ids (if they are different from the mapping default)
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and can provide text revisions.
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def parse_roundtripping_metadata(text):
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"""Parse Bazaar roundtripping metadata."""
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ret = CommitSupplement()
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for l in f.readlines():
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(key, value) = l.split(":", 1)
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if key == "revision-id":
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ret.revision_id = value.strip()
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elif key == "parent-ids":
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ret.explicit_parent_ids = tuple(value.strip().split(" "))
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elif key == "testament3-sha1":
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ret.verifiers["testament3-sha1"] = value.strip()
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elif key.startswith("property-"):
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name = key[len("property-"):]
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if not name in ret.properties:
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ret.properties[name] = value[1:].rstrip("\n")
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ret.properties[name] += "\n" + value[1:].rstrip("\n")
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def generate_roundtripping_metadata(metadata, encoding):
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"""Serialize the roundtripping metadata.
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:param metadata: A `CommitSupplement` instance
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:return: String with revision metadata
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if metadata.revision_id:
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lines.append("revision-id: %s\n" % metadata.revision_id)
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if metadata.explicit_parent_ids:
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lines.append("parent-ids: %s\n" % " ".join(metadata.explicit_parent_ids))
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for key in sorted(metadata.properties.keys()):
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for l in metadata.properties[key].split("\n"):
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lines.append("property-%s: %s\n" % (key.encode(encoding), osutils.safe_utf8(l)))
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if "testament3-sha1" in metadata.verifiers:
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lines.append("testament3-sha1: %s\n" %
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metadata.verifiers["testament3-sha1"])
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return "".join(lines)
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def extract_bzr_metadata(message):
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"""Extract Bazaar metadata from a commit message.
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:param message: Commit message to extract from
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:return: Tuple with original commit message and metadata object
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split = message.split("\n--BZR--\n", 1)
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return split[0], parse_roundtripping_metadata(split[1])
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def inject_bzr_metadata(message, commit_supplement, encoding):
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if not commit_supplement:
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rt_data = generate_roundtripping_metadata(commit_supplement, encoding)
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assert type(rt_data) == str
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return message + "\n--BZR--\n" + rt_data
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def serialize_fileid_map(file_ids):
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"""Serialize a file id map."""
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for path in sorted(file_ids.keys()):
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lines.append("%s\0%s\n" % (path, file_ids[path]))
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def deserialize_fileid_map(filetext):
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"""Deserialize a file id map."""
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f = StringIO(filetext)
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lines = f.readlines()
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(path, file_id) = l.rstrip("\n").split("\0")