~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# FIXME: "bzr commit doc/format" commits doc/format.txt!

def commit(branch, message,

           timestamp=None,

           timezone=None,

           committer=None,

           verbose=True,

           specific_files=None,

           rev_id=None,

           allow_pointless=True):

    """Commit working copy as a new revision.

    The basic approach is to add all the file texts into the

    store, then the inventory, then make a new revision pointing

    to that inventory and store that.

    This is not quite safe if the working copy changes during the

    commit; for the moment that is simply not allowed.  A better

    approach is to make a temporary copy of the files before

    computing their hashes, and then add those hashes in turn to

    the inventory.  This should mean at least that there are no

    broken hash pointers.  There is no way we can get a snapshot

    of the whole directory at an instant.  This would also have to

    be robust against files disappearing, moving, etc.  So the

    whole thing is a bit hard.

    This raises PointlessCommit if there are no changes, no new merges,

    and allow_pointless  is false.

    timestamp -- if not None, seconds-since-epoch for a

         postdated/predated commit.

    specific_files

        If true, commit only those files.

    rev_id

        If set, use this as the new revision id.

        Useful for test or import commands that need to tightly

        control what revisions are assigned.  If you duplicate

        a revision id that exists elsewhere it is your own fault.

        If null (default), a time/random revision id is generated.

    """

    import time, tempfile

    from bzrlib.osutils import local_time_offset, username

    from bzrlib.branch import gen_file_id

    from bzrlib.errors import BzrError, PointlessCommit

    from bzrlib.revision import Revision, RevisionReference

    from bzrlib.trace import mutter, note

    from bzrlib.xml import pack_xml

    branch.lock_write()

    try:

        # First walk over the working inventory; and both update that

        # and also build a new revision inventory.  The revision

        # inventory needs to hold the text-id, sha1 and size of the

        # actual file versions committed in the revision.  (These are

        # not present in the working inventory.)  We also need to

        # detect missing/deleted files, and remove them from the

        # working inventory.

        work_tree = branch.working_tree()

        work_inv = work_tree.inventory

        basis = branch.basis_tree()

        basis_inv = basis.inventory

        if verbose:

            note('looking for changes...')

        pending_merges = branch.pending_merges()

        missing_ids, new_inv, any_changes = \

                     _gather_commit(branch,

                                    work_tree,

                                    work_inv,

                                    basis_inv,

                                    specific_files,

                                    verbose)

        if not (any_changes or allow_pointless or pending_merges):

            raise PointlessCommit()

        for file_id in missing_ids:

            # Any files that have been deleted are now removed from the

            # working inventory.  Files that were not selected for commit

            # are left as they were in the working inventory and ommitted

            # from the revision inventory.

            # have to do this later so we don't mess up the iterator.

            # since parents may be removed before their children we

            # have to test.

            # FIXME: There's probably a better way to do this; perhaps

            # the workingtree should know how to filter itbranch.

            if work_inv.has_id(file_id):

                del work_inv[file_id]

        if rev_id is None:

            rev_id = _gen_revision_id(branch, time.time())

        inv_id = rev_id

        inv_tmp = tempfile.TemporaryFile()

        pack_xml(new_inv, inv_tmp)

        inv_tmp.seek(0)

        branch.inventory_store.add(inv_tmp, inv_id)

        mutter('new inventory_id is {%s}' % inv_id)

        # We could also just sha hash the inv_tmp file

        # however, in the case that branch.inventory_store.add()

        # ever actually does anything special

        inv_sha1 = branch.get_inventory_sha1(inv_id)

        branch._write_inventory(work_inv)

        if timestamp == None:

            timestamp = time.time()

        if committer == None:

            committer = username(branch)

        if timezone == None:

            timezone = local_time_offset()

        mutter("building commit log message")

        rev = Revision(timestamp=timestamp,

                       timezone=timezone,

                       committer=committer,

                       message = message,

                       inventory_id=inv_id,

                       inventory_sha1=inv_sha1,

                       revision_id=rev_id)

        rev.parents = []

        precursor_id = branch.last_patch()

        if precursor_id:

            precursor_sha1 = branch.get_revision_sha1(precursor_id)

            rev.parents.append(RevisionReference(precursor_id, precursor_sha1))

        for merge_rev in pending_merges:

            rev.parents.append(RevisionReference(merge_rev))            

        rev_tmp = tempfile.TemporaryFile()

        pack_xml(rev, rev_tmp)

        rev_tmp.seek(0)

        branch.revision_store.add(rev_tmp, rev_id)

        mutter("new revision_id is {%s}" % rev_id)

        ## XXX: Everything up to here can simply be orphaned if we abort

        ## the commit; it will leave junk files behind but that doesn't

        ## matter.

        ## TODO: Read back the just-generated changeset, and make sure it

        ## applies and recreates the right state.

        ## TODO: Also calculate and store the inventory SHA1

        mutter("committing patch r%d" % (branch.revno() + 1))

        branch.append_revision(rev_id)

        branch.set_pending_merges([])

        if verbose:

            note("commited r%d" % branch.revno())

    finally:

        branch.unlock()

def _gen_revision_id(branch, when):

    """Return new revision-id."""

    from binascii import hexlify

    from bzrlib.osutils import rand_bytes, compact_date, user_email

    s = '%s-%s-' % (user_email(branch), compact_date(when))

    s += hexlify(rand_bytes(8))

    return s

def _gather_commit(branch, work_tree, work_inv, basis_inv, specific_files,

                   verbose):

    """Build inventory preparatory to commit.

    Returns missing_ids, new_inv, any_changes.

    This adds any changed files into the text store, and sets their

    test-id, sha and size in the returned inventory appropriately.

    missing_ids

        Modified to hold a list of files that have been deleted from

        the working directory; these should be removed from the

        working inventory.

    """

    from bzrlib.inventory import Inventory

    from bzrlib.osutils import isdir, isfile, sha_string, quotefn, \

         local_time_offset, username, kind_marker, is_inside_any

    from bzrlib.branch import gen_file_id

    from bzrlib.errors import BzrError

    from bzrlib.revision import Revision

    from bzrlib.trace import mutter, note

    any_changes = False

    inv = Inventory(work_inv.root.file_id)

    missing_ids = []

    for path, entry in work_inv.iter_entries():

        ## TODO: Check that the file kind has not changed from the previous

        ## revision of this file (if any).

        p = branch.abspath(path)

        file_id = entry.file_id

        mutter('commit prep file %s, id %r ' % (p, file_id))

        if specific_files and not is_inside_any(specific_files, path):

            mutter('  skipping file excluded from commit')

            if basis_inv.has_id(file_id):

                # carry over with previous state

                inv.add(basis_inv[file_id].copy())

            else:

                # omit this from committed inventory

                pass

            continue

        if not work_tree.has_id(file_id):

            if verbose:

                print('deleted %s%s' % (path, kind_marker(entry.kind)))

                any_changes = True

            mutter("    file is missing, removing from inventory")

            missing_ids.append(file_id)

            continue

        # this is present in the new inventory; may be new, modified or

        # unchanged.

        old_ie = basis_inv.has_id(file_id) and basis_inv[file_id]

        entry = entry.copy()

        inv.add(entry)

        if old_ie:

            old_kind = old_ie.kind

            if old_kind != entry.kind:

                raise BzrError("entry %r changed kind from %r to %r"

                        % (file_id, old_kind, entry.kind))

        if entry.kind == 'directory':

            if not isdir(p):

                raise BzrError("%s is entered as directory but not a directory"

                               % quotefn(p))

        elif entry.kind == 'file':

            if not isfile(p):

                raise BzrError("%s is entered as file but is not a file" % quotefn(p))

            new_sha1 = work_tree.get_file_sha1(file_id)

            if (old_ie

                and old_ie.text_sha1 == new_sha1):

                ## assert content == basis.get_file(file_id).read()

                entry.text_id = old_ie.text_id

                entry.text_sha1 = new_sha1

                entry.text_size = old_ie.text_size

                mutter('    unchanged from previous text_id {%s}' %

                       entry.text_id)

            else:

                content = file(p, 'rb').read()

                # calculate the sha again, just in case the file contents

                # changed since we updated the cache

                entry.text_sha1 = sha_string(content)

                entry.text_size = len(content)

                entry.text_id = gen_file_id(entry.name)

                branch.text_store.add(content, entry.text_id)

                mutter('    stored with text_id {%s}' % entry.text_id)

        if verbose:

            marked = path + kind_marker(entry.kind)

            if not old_ie:

                print 'added', marked

                any_changes = True

            elif old_ie == entry:

                pass                    # unchanged

            elif (old_ie.name == entry.name

                  and old_ie.parent_id == entry.parent_id):

                print 'modified', marked

                any_changes = True

            else:

                print 'renamed', marked

                any_changes = True

    return missing_ids, inv, any_changes