14
14
# along with this program; if not, write to the Free Software
15
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
"""Roundtripping support.
19
Bazaar stores more data than Git, which means that in order to preserve
20
a commit when it is pushed from Bazaar into Git we have to stash
21
that extra metadata somewhere.
23
There are two kinds of metadata relevant here:
24
* per-file metadata (stored by revision+path)
25
- usually stored per tree
26
* per-revision metadata (stored by git commit id)
28
Bazaar revisions have the following information that is not
29
present in Git commits:
37
* path last changed revisions [1]
39
[1] path last changed revision information can usually
40
be induced from the existing history, unless
41
ghost revisions are involved.
43
This extra metadata is stored in so-called "supplements":
48
from bzrlib import osutils
17
"""Roundtripping support."""
50
20
from cStringIO import StringIO
53
class CommitSupplement(object):
54
"""Supplement for a Bazaar revision roundtripped into Git.
23
class BzrGitRevisionMetadata(object):
24
"""Metadata for a Bazaar revision roundtripped into Git.
56
26
:ivar revision_id: Revision id, as string
57
27
:ivar properties: Revision properties, as dictionary
64
34
explicit_parent_ids = None
66
38
def __init__(self):
67
39
self.properties = {}
70
41
def __nonzero__(self):
71
return bool(self.revision_id or self.properties or self.explicit_parent_ids)
74
class TreeSupplement(object):
75
"""Supplement for a Bazaar tree roundtripped into Git.
77
This provides file ids (if they are different from the mapping default)
78
and can provide text revisions.
42
return bool(self.revision_id or self.properties)
83
45
def parse_roundtripping_metadata(text):
84
46
"""Parse Bazaar roundtripping metadata."""
85
ret = CommitSupplement()
47
ret = BzrGitRevisionMetadata()
87
49
for l in f.readlines():
88
50
(key, value) = l.split(":", 1)
93
55
elif key == "testament3-sha1":
94
56
ret.verifiers["testament3-sha1"] = value.strip()
95
57
elif key.startswith("property-"):
96
name = key[len("property-"):]
97
if not name in ret.properties:
98
ret.properties[name] = value[1:].rstrip("\n")
100
ret.properties[name] += "\n" + value[1:].rstrip("\n")
58
ret.properties[key[len("property-"):]] = value[1:].rstrip("\n")
106
64
def generate_roundtripping_metadata(metadata, encoding):
107
65
"""Serialize the roundtripping metadata.
109
:param metadata: A `CommitSupplement` instance
67
:param metadata: A `BzrGitRevisionMetadata` instance
110
68
:return: String with revision metadata
115
73
if metadata.explicit_parent_ids:
116
74
lines.append("parent-ids: %s\n" % " ".join(metadata.explicit_parent_ids))
117
75
for key in sorted(metadata.properties.keys()):
118
for l in metadata.properties[key].split("\n"):
119
lines.append("property-%s: %s\n" % (key.encode(encoding), osutils.safe_utf8(l)))
76
lines.append("property-%s: %s\n" % (key.encode(encoding), metadata.properties[key].encode(encoding)))
120
77
if "testament3-sha1" in metadata.verifiers:
121
78
lines.append("testament3-sha1: %s\n" %
122
79
metadata.verifiers["testament3-sha1"])
135
92
return split[0], parse_roundtripping_metadata(split[1])
138
def inject_bzr_metadata(message, commit_supplement, encoding):
139
if not commit_supplement:
95
def inject_bzr_metadata(message, metadata, encoding):
141
rt_data = generate_roundtripping_metadata(commit_supplement, encoding)
98
rt_data = generate_roundtripping_metadata(metadata, encoding)
144
101
assert type(rt_data) == str