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
"""Make a copy of an entire branch and all its history.
19
This is the underlying function for the branch/get/clone commands."""
17
21
# TODO: This could be done *much* more efficiently by just copying
18
22
# all the whole weaves and revisions, rather than getting one
19
23
# revision at a time.
21
# TODO: Do we really need to invoke merge() to build the working directory?
22
# That seems a bit of an abstraction inversion.
25
# TODO: Optionally, after copying, discard any irrelevant information from
26
# the destination, such as revisions committed after the last one we're interested
27
# in. This needs to apply a weave prune operation (not written yet) to each
30
# Copying must be done in a way that supports http transports, where we
31
# can't list a directory, and therefore have to rely on information
32
# retrieved from top-level objects whose names we do know.
34
# In practice this means we first fetch the revision history and ancestry.
35
# These give us a list of all the revisions that need to be fetched. We
36
# also get the inventory weave. We then just need to get a list of all
37
# file-ids ever referenced by this tree. (It might be nice to keep a list
38
# of them directly.) This is done by walking over the inventories of all
39
# copied revisions and accumulating a list of file ids.
41
# For local branches it is possible to optimize this considerably in two
42
# ways. One is to hardlink the files (if possible and requested), rather
43
# than copying them. Another is to simply list the directory rather than
44
# walking through the inventories to find out what files are present -- but
45
# there it may be better to just be consistent with remote branches.
27
from bzrlib.merge import merge
50
from bzrlib.merge import build_working_dir
28
51
from bzrlib.branch import Branch
29
from bzrlib.trace import mutter
52
from bzrlib.trace import mutter, note
53
from bzrlib.store import copy_all
32
55
def copy_branch(branch_from, to_location, revision=None, basis_branch=None):
33
56
"""Copy branch_from into the existing directory to_location.
36
If not None, only revisions up to this point will be copied.
37
The head of the new branch will be that revision. Must be a
41
The name of a local directory that exists but is empty.
58
Returns the newly created branch object.
61
If not None, only revisions up to this point will be copied.
62
The head of the new branch will be that revision. Must be a
65
to_location -- The destination directory; must either exist and be
66
empty, or not exist, in which case it is created.
69
A local branch to copy revisions from, related to branch_from.
70
This is used when branching from a remote (slow) branch, and we have
71
a local branch that might contain some relevant revisions.
73
assert isinstance(branch_from, Branch)
74
assert isinstance(to_location, basestring)
75
if basis_branch is not None:
76
note("basis_branch is not supported for fast weave copy yet.")
77
history = _get_truncated_history(branch_from, revision)
78
if not os.path.exists(to_location):
80
branch_to = Branch.initialize(to_location)
81
mutter("copy branch from %s to %s", branch_from, branch_to)
82
branch_to.set_root_id(branch_from.get_root_id())
83
branch_to.append_revision(*history)
84
_copy_control_weaves(branch_from, branch_to)
85
_copy_text_weaves(branch_from, branch_to)
86
_copy_revision_store(branch_from, branch_to)
87
build_working_dir(to_location)
88
branch_to.set_parent(branch_from.base)
94
def _get_truncated_history(branch_from, revision):
95
history = branch_from.revision_history()
99
idx = history.index(revision)
101
raise InvalidRevisionId('revision {%s} is not on the mainline of %s'
102
% (revision, branch_from))
103
return history[:idx+1]
105
def _copy_text_weaves(branch_from, branch_to):
106
# TODO: Handle UnlistableStore and fall back to getting a list of
107
# all file-ids and copying them one by one.
108
copy_all(branch_from.weave_store, branch_to.weave_store)
111
def _copy_revision_store(branch_from, branch_to):
112
# TODO: Copy all revisions mentioned in the ancestry of the selected revision
113
copy_all(branch_from.revision_store, branch_to.revision_store)
116
def _copy_control_weaves(branch_from, branch_to):
117
to_control = branch_to.control_weaves
118
from_control = branch_from.control_weaves
119
to_control.copy_multi(from_control, ['inventory', 'ancestry'])
122
def copy_branch_slower(branch_from, to_location, revision=None, basis_branch=None):
123
"""Copy branch_from into the existing directory to_location.
126
If not None, only revisions up to this point will be copied.
127
The head of the new branch will be that revision. Must be a
130
to_location -- The destination directory; must either exist and be
131
empty, or not exist, in which case it is created.
44
134
The revision to copy up to
47
A local branch to copy revisions from, related to branch_from
137
A local branch to copy revisions from, related to branch_from.
138
This is used when branching from a remote (slow) branch, and we have
139
a local branch that might contain some relevant revisions.
49
141
assert isinstance(branch_from, Branch)
50
142
assert isinstance(to_location, basestring)
143
if not os.path.exists(to_location):
144
os.mkdir(to_location)
52
145
br_to = Branch.initialize(to_location)
53
146
mutter("copy branch from %s to %s", branch_from, br_to)
54
147
if basis_branch is not None:
added
removed
bzrlib/clone.py
