/brz/remove-bazaar

# Copyright (C) 2009-2018 Jelmer Vernooij <jelmer@jelmer.uk>

# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Custom revision specifier for Subversion."""

from __future__ import absolute_import

# Please note that imports are delayed as much as possible here since

# if DWIM revspecs are supported this module is imported by __init__.py.

from ..errors import (

    InvalidRevisionId,

    )

from ..revision import (

    NULL_REVISION,

)

from ..revisionspec import (

    InvalidRevisionSpec,

    RevisionInfo,

    RevisionSpec,

    )

def valid_git_sha1(hex):

    """Check if `hex` is a validly formatted Git SHA1.

    :param hex: Hex string to validate

    :return: Boolean

    """

    try:

        int(hex, 16)

    except ValueError:

        return False

    else:

        return True

class RevisionSpec_git(RevisionSpec):

    """Selects a revision using a Git commit SHA1."""

    help_txt = """Selects a revision using a Git commit SHA1.

    Selects a revision using a Git commit SHA1, short or long.

    This works for both native Git repositories and Git revisions

    imported into Bazaar repositories.

    """

    prefix = 'git:'

    wants_revision_history = False

    def _lookup_git_sha1(self, branch, sha1):

        from .errors import (

            GitSmartRemoteNotSupported,

            )

        from .mapping import (

            default_mapping,

            )

        bzr_revid = getattr(branch.repository, "lookup_foreign_revision_id",

                            default_mapping.revision_id_foreign_to_bzr)(sha1)

        try:

            if branch.repository.has_revision(bzr_revid):

                return bzr_revid

        except GitSmartRemoteNotSupported:

            return bzr_revid

        raise InvalidRevisionSpec(self.user_spec, branch)

    def __nonzero__(self):

        # The default implementation uses branch.repository.has_revision()

        if self.rev_id is None:

            return False

        if self.rev_id == NULL_REVISION:

            return False

        return True

    def _find_short_git_sha1(self, branch, sha1):

        from .mapping import (

            ForeignGit,

            mapping_registry,

            )

        parse_revid = getattr(branch.repository, "lookup_bzr_revision_id",

                              mapping_registry.parse_revision_id)

        def matches_revid(revid):

            if revid == NULL_REVISION:

                return False

            try:

                foreign_revid, mapping = parse_revid(revid)

            except InvalidRevisionId:

                return False

            if not isinstance(mapping.vcs, ForeignGit):

                return False

            return foreign_revid.startswith(sha1)

        with branch.repository.lock_read():

            graph = branch.repository.get_graph()

            last_revid = branch.last_revision()

            if matches_revid(last_revid):

                return last_revid

            for revid, _ in graph.iter_ancestry([last_revid]):

                if matches_revid(revid):

                    return revid

            raise InvalidRevisionSpec(self.user_spec, branch)

    def _as_revision_id(self, context_branch):

        loc = self.spec.find(':')

        git_sha1 = self.spec[loc + 1:].encode("utf-8")

        if (len(git_sha1) > 40 or len(git_sha1) < 4 or

                not valid_git_sha1(git_sha1)):

            raise InvalidRevisionSpec(self.user_spec, context_branch)

        from . import (

            lazy_check_versions,

            )

        lazy_check_versions()

        if len(git_sha1) == 40:

            return self._lookup_git_sha1(context_branch, git_sha1)

        else:

            return self._find_short_git_sha1(context_branch, git_sha1)

    def _match_on(self, branch, revs):

        revid = self._as_revision_id(branch)

        return RevisionInfo.from_revision_id(branch, revid)

    def needs_branch(self):

        return True

    def get_branch(self):

        return None