13
13
# You should have received a copy of the GNU General Public License
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
18
from cStringIO import StringIO
20
16
import bzrlib.errors
21
from bzrlib.trace import mutter, note, warning
17
from bzrlib.trace import mutter, note
22
18
from bzrlib.branch import Branch
23
19
from bzrlib.progress import ProgressBar
24
from bzrlib.xml5 import serializer_v5
25
from bzrlib.osutils import sha_string, split_lines
26
from bzrlib.errors import InstallFailed, NoSuchRevision, WeaveError
28
"""Copying of history from one branch to another.
30
The basic plan is that every branch knows the history of everything
31
that has merged into it. As the first step of a merge, pull, or
32
branch operation we copy history from the source into the destination
35
The copying is done in a slightly complicated order. We don't want to
36
add a revision to the store until everything it refers to is also
37
stored, so that if a revision is present we can totally recreate it.
38
However, we can't know what files are included in a revision until we
39
read its inventory. Therefore, we first pull the XML and hold it in
40
memory until we've updated all of the files referenced.
43
# TODO: Avoid repeatedly opening weaves so many times.
45
# XXX: This doesn't handle ghost (not present in branch) revisions at
46
# all yet. I'm not sure they really should be supported.
48
# NOTE: This doesn't copy revisions which may be present but not
49
# merged into the last revision. I'm not sure we want to do that.
51
# - get a list of revisions that need to be pulled in
52
# - for each one, pull in that revision file
53
# and get the inventory, and store the inventory with right
55
# - and get the ancestry, and store that with right parents too
56
# - and keep a note of all file ids and version seen
57
# - then go through all files; for each one get the weave,
58
# and add in all file versions
23
def has_revision(branch, revision_id):
25
branch.get_revision_xml(revision_id)
27
except bzrlib.errors.NoSuchRevision:
62
31
def greedy_fetch(to_branch, from_branch, revision=None, pb=None):
63
f = Fetcher(to_branch, from_branch, revision, pb)
64
return f.count_copied, f.failed_revisions
68
class Fetcher(object):
69
"""Pull revisions and texts from one branch to another.
71
This doesn't update the destination's history; that can be done
72
separately if desired.
75
If set, pull only up to this revision_id.
79
last_revision -- if last_revision
80
is given it will be that, otherwise the last revision of
83
count_copied -- number of revisions copied
85
count_weaves -- number of file weaves copied
32
"""Copy a revision and all available ancestors from one branch to another
33
If no revision is specified, uses the last revision in the source branch's
87
def __init__(self, to_branch, from_branch, last_revision=None, pb=None):
88
if to_branch == from_branch:
89
raise Exception("can't fetch from a branch to itself")
90
self.to_branch = to_branch
91
self.to_weaves = to_branch.weave_store
92
self.to_control = to_branch.control_weaves
93
self.from_branch = from_branch
94
self.from_weaves = from_branch.weave_store
95
self.from_control = from_branch.control_weaves
96
self.failed_revisions = []
100
self.copied_file_ids = set()
102
self.pb = bzrlib.ui.ui_factory.progress_bar()
106
self.last_revision = self._find_last_revision(last_revision)
107
except NoSuchRevision, e:
108
mutter('failed getting last revision: %s', e)
109
raise InstallFailed([last_revision])
110
mutter('fetch up to rev {%s}', self.last_revision)
112
revs_to_fetch = self._compare_ancestries()
114
raise InstallFailed([self.last_revision])
115
self._copy_revisions(revs_to_fetch)
116
self.new_ancestry = revs_to_fetch
119
def _find_last_revision(self, last_revision):
120
"""Find the limiting source revision.
122
Every ancestor of that revision will be merged across.
124
Returns the revision_id, or returns None if there's no history
125
in the source branch."""
126
self.pb.update('get source history')
127
from_history = self.from_branch.revision_history()
128
self.pb.update('get destination history')
130
self.from_branch.get_revision(last_revision)
133
return from_history[-1]
135
return None # no history in the source branch
138
def _compare_ancestries(self):
139
"""Get a list of revisions that must be copied.
141
That is, every revision that's in the ancestry of the source
142
branch and not in the destination branch."""
143
self.pb.update('get source ancestry')
144
self.from_ancestry = self.from_branch.get_ancestry(self.last_revision)
146
dest_last_rev = self.to_branch.last_revision()
147
self.pb.update('get destination ancestry')
149
dest_ancestry = self.to_branch.get_ancestry(dest_last_rev)
152
ss = set(dest_ancestry)
154
for rev_id in self.from_ancestry:
156
to_fetch.append(rev_id)
157
mutter('need to get revision {%s}', rev_id)
158
mutter('need to get %d revisions in total', len(to_fetch))
159
self.count_total = len(to_fetch)
162
def _copy_revisions(self, revs_to_fetch):
164
for rev_id in revs_to_fetch:
168
if self.to_branch.has_revision(rev_id):
170
self.pb.update('fetch revision', i, self.count_total)
171
self._copy_one_revision(rev_id)
172
self.count_copied += 1
175
def _copy_one_revision(self, rev_id):
176
"""Copy revision and everything referenced by it."""
177
mutter('copying revision {%s}', rev_id)
178
rev_xml = self.from_branch.get_revision_xml(rev_id)
179
inv_xml = self.from_branch.get_inventory_xml(rev_id)
180
rev = serializer_v5.read_revision_from_string(rev_xml)
181
inv = serializer_v5.read_inventory_from_string(inv_xml)
182
assert rev.revision_id == rev_id
183
assert rev.inventory_sha1 == sha_string(inv_xml)
184
mutter(' commiter %s, %d parents',
187
self._copy_new_texts(rev_id, inv)
188
parents = rev.parent_ids
189
for parent in parents:
190
if not self.to_branch.has_revision(parent):
191
parents.pop(parents.index(parent))
192
self._copy_inventory(rev_id, inv_xml, parents)
193
self.to_branch.revision_store.add(StringIO(rev_xml), rev_id)
194
mutter('copied revision %s', rev_id)
197
def _copy_inventory(self, rev_id, inv_xml, parent_ids):
198
self.to_control.add_text('inventory', rev_id,
199
split_lines(inv_xml), parent_ids)
201
def _copy_new_texts(self, rev_id, inv):
202
"""Copy any new texts occuring in this revision."""
203
# TODO: Rather than writing out weaves every time, hold them
204
# in memory until everything's done? But this way is nicer
205
# if it's interrupted.
206
for path, ie in inv.iter_entries():
207
if ie.revision != rev_id:
209
mutter('%s {%s} is changed in this revision',
211
self._copy_one_weave(rev_id, ie.file_id)
214
def _copy_one_weave(self, rev_id, file_id):
215
"""Copy one file weave."""
216
mutter('copy file {%s} modified in {%s}', file_id, rev_id)
217
if file_id in self.copied_file_ids:
218
mutter('file {%s} already copied', file_id)
220
from_weave = self.from_weaves.get_weave(file_id)
221
to_weave = self.to_weaves.get_weave_or_empty(file_id)
222
to_weave.join(from_weave)
223
self.to_weaves.put_weave(file_id, to_weave)
224
self.count_weaves += 1
225
self.copied_file_ids.add(file_id)
226
mutter('copied file {%s}', file_id)
36
from_history = from_branch.revision_history()
37
required_revisions = set(from_history)
39
if revision is not None:
40
required_revisions.add(revision)
42
rev_index = from_history.index(revision)
45
if rev_index is not None:
46
from_history = from_history[:rev_index + 1]
48
from_history = [revision]
49
to_history = to_branch.revision_history()
51
for rev_id in from_history:
52
if not has_revision(to_branch, rev_id):
53
missing.append(rev_id)
56
while len(missing) > 0:
57
installed, failed = to_branch.install_revisions(from_branch,
61
required_failed = failed.intersection(required_revisions)
62
if len(required_failed) > 0:
63
raise bzrlib.errors.InstallFailed(required_failed)
65
note("Failed to install %s" % rev_id)
66
all_failed.update(failed)
68
for rev_id in missing:
70
revision = from_branch.get_revision(rev_id)
71
except bzrlib.errors.NoSuchRevision:
72
if revision in from_history:
76
for parent in [p.revision_id for p in revision.parents]:
77
if not has_revision(to_branch, parent):
78
new_missing.add(parent)
80
return count, all_failed
added
removed
bzrlib/fetch.py
