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  • Committer: Gustav Hartvigsson
  • Date: 2021-01-09 21:36:27 UTC
  • Revision ID: gustav.hartvigsson@gmail.com-20210109213627-h1xwcutzy9m7a99b
Added 'Case Preserving Working Tree Use Cases' from Canonical Wiki

* Addod a page from the Canonical Bazaar wiki
  with information on the scmeatics of case
  perserving filesystems an a case insensitive
  filesystem works.
  
  * Needs re-work, but this will do as it is the
    same inforamoton as what was on the linked
    page in the currint documentation.

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breezy/switch.py
 
1
# Copyright (C) 2007, 2009-2012 Canonical Ltd.
 
2
#
 
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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.
 
7
#
 
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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.
 
12
#
 
13
# You should have received a copy of the GNU General Public License
 
14
# along with this program; if not, write to the Free Software
 
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
16
 
 
17
# Original author: David Allouche
 
18
 
 
19
from . import (
 
20
    errors,
 
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    lock,
 
22
    merge,
 
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    revision
 
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    )
 
25
from .branch import Branch
 
26
from .i18n import gettext
 
27
from .trace import note
 
28
 
 
29
 
 
30
def _run_post_switch_hooks(control_dir, to_branch, force, revision_id):
 
31
    from .branch import SwitchHookParams
 
32
    hooks = Branch.hooks['post_switch']
 
33
    if not hooks:
 
34
        return
 
35
    params = SwitchHookParams(control_dir, to_branch, force, revision_id)
 
36
    for hook in hooks:
 
37
        hook(params)
 
38
 
 
39
 
 
40
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None,
 
41
           store_uncommitted=False, possible_transports=None):
 
42
    """Switch the branch associated with a checkout.
 
43
 
 
44
    :param control_dir: ControlDir of the checkout to change
 
45
    :param to_branch: branch that the checkout is to reference
 
46
    :param force: skip the check for local commits in a heavy checkout
 
47
    :param revision_id: revision ID to switch to.
 
48
    :param store_uncommitted: If True, store uncommitted changes in the
 
49
        branch.
 
50
    """
 
51
    try:
 
52
        tree = control_dir.open_workingtree()
 
53
    except errors.NotBranchError as ex:
 
54
        # Lightweight checkout and branch is no longer there
 
55
        if not force or store_uncommitted:
 
56
            raise ex
 
57
        else:
 
58
            tree = None
 
59
    else:
 
60
        if store_uncommitted or tree.branch.get_bound_location():
 
61
            tree.lock_write()
 
62
        else:
 
63
            tree.lock_tree_write()
 
64
    try:
 
65
        if tree is not None:
 
66
            parent_ids = tree.get_parent_ids()
 
67
            if len(parent_ids) > 1:
 
68
                raise errors.CommandError(
 
69
                    gettext('Pending merges must be '
 
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                            'committed or reverted before using switch.'))
 
71
 
 
72
        if store_uncommitted:
 
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            tree.store_uncommitted()
 
74
        if tree is None:
 
75
            source_repository = to_branch.repository
 
76
            base_revision_id = None
 
77
        else:
 
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            source_repository = tree.branch.repository
 
79
            # Attempt to retrieve the base_revision_id now, since some
 
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            # working tree formats (i.e. git) don't have their own
 
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            # last_revision but just use that of the currently active branch.
 
82
            base_revision_id = tree.last_revision()
 
83
    finally:
 
84
        if tree is not None:
 
85
            tree.unlock()
 
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    with to_branch.lock_read():
 
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        _set_branch_location(control_dir, to_branch, tree.branch if tree else None, force)
 
88
    tree = control_dir.open_workingtree()
 
89
    if store_uncommitted:
 
90
        tree.lock_write()
 
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    else:
 
92
        tree.lock_tree_write()
 
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    try:
 
94
        if base_revision_id is None:
 
95
            # If we couldn't get to the tree's last_revision earlier, perhaps
 
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            # we can now.
 
97
            base_revision_id = tree.last_revision()
 
98
        if revision_id is None:
 
99
            revision_id = to_branch.last_revision()
 
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        if base_revision_id == revision_id:
 
101
            if not quiet:
 
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                note(gettext("Tree is up to date at revision %d."),
 
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                     to_branch.revno())
 
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        else:
 
105
            base_tree = source_repository.revision_tree(base_revision_id)
 
106
            target_tree = to_branch.repository.revision_tree(revision_id)
 
107
            merge.Merge3Merger(tree, tree, base_tree, target_tree)
 
108
            tree.set_last_revision(revision_id)
 
109
            if not quiet:
 
110
                note(gettext('Updated to revision %d.') % to_branch.revno())
 
111
        if store_uncommitted:
 
112
            tree.restore_uncommitted()
 
113
        _run_post_switch_hooks(control_dir, to_branch, force, revision_id)
 
114
    finally:
 
115
        tree.unlock()
 
116
 
 
117
 
 
118
def _set_branch_location(control, to_branch, current_branch, force=False):
 
119
    """Set location value of a branch reference.
 
120
 
 
121
    :param control: ControlDir of the checkout to change
 
122
    :param to_branch: branch that the checkout is to reference
 
123
    :param force: skip the check for local commits in a heavy checkout
 
124
    """
 
125
    branch_format = control.find_branch_format()
 
126
    if branch_format.get_reference(control) is not None:
 
127
        # Lightweight checkout: update the branch reference
 
128
        branch_format.set_reference(control, None, to_branch)
 
129
    else:
 
130
        b = current_branch
 
131
        bound_branch = b.get_bound_location()
 
132
        if bound_branch is not None:
 
133
            # Heavyweight checkout: check all local commits
 
134
            # have been pushed to the current bound branch then
 
135
            # synchronise the local branch with the new remote branch
 
136
            # and bind to it
 
137
            possible_transports = []
 
138
            try:
 
139
                if not force and _any_local_commits(b, possible_transports):
 
140
                    raise errors.CommandError(gettext(
 
141
                        'Cannot switch as local commits found in the checkout. '
 
142
                        'Commit these to the bound branch or use --force to '
 
143
                        'throw them away.'))
 
144
            except errors.BoundBranchConnectionFailure as e:
 
145
                raise errors.CommandError(gettext(
 
146
                    'Unable to connect to current master branch %(target)s: '
 
147
                    '%(error)s To switch anyway, use --force.') %
 
148
                    e.__dict__)
 
149
            with b.lock_write():
 
150
                b.set_bound_location(None)
 
151
                b.pull(to_branch, overwrite=True,
 
152
                       possible_transports=possible_transports)
 
153
                b.set_bound_location(to_branch.base)
 
154
                b.set_parent(b.get_master_branch().get_parent())
 
155
        else:
 
156
            # If this is a standalone tree and the new branch
 
157
            # is derived from this one, create a lightweight checkout.
 
158
            with b.lock_read():
 
159
                graph = b.repository.get_graph(to_branch.repository)
 
160
                if (b.controldir._format.colocated_branches and
 
161
                    (force or graph.is_ancestor(
 
162
                        b.last_revision(), to_branch.last_revision()))):
 
163
                    b.controldir.destroy_branch()
 
164
                    b.controldir.set_branch_reference(to_branch, name="")
 
165
                else:
 
166
                    raise errors.CommandError(
 
167
                        gettext('Cannot switch a branch, only a checkout.'))
 
168
 
 
169
 
 
170
def _any_local_commits(this_branch, possible_transports):
 
171
    """Does this branch have any commits not in the master branch?"""
 
172
    last_rev = revision.ensure_null(this_branch.last_revision())
 
173
    if last_rev != revision.NULL_REVISION:
 
174
        other_branch = this_branch.get_master_branch(possible_transports)
 
175
        with this_branch.lock_read(), other_branch.lock_read():
 
176
            other_last_rev = other_branch.last_revision()
 
177
            graph = this_branch.repository.get_graph(
 
178
                other_branch.repository)
 
179
            if not graph.is_ancestor(last_rev, other_last_rev):
 
180
                return True
 
181
    return False