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Viewing changes to breezy/git/revspec.py

  • Committer: Jelmer Vernooij
  • Date: 2018-11-06 02:25:29 UTC
  • mto: This revision was merged to the branch mainline in revision 7150.
  • Revision ID: jelmer@jelmer.uk-20181106022529-qlctdqketvoibpvz
Simplify brz-git, drop imports.

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breezy/git/revspec.py
 
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# Copyright (C) 2009-2018 Jelmer Vernooij <jelmer@jelmer.uk>
 
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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.
 
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#
 
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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.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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"""Custom revision specifier for Subversion."""
 
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from __future__ import absolute_import
 
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# Please note that imports are delayed as much as possible here since
 
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# if DWIM revspecs are supported this module is imported by __init__.py.
 
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from .. import version_info as breezy_version
 
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from ..errors import (
 
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    InvalidRevisionId,
 
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    InvalidRevisionSpec,
 
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    )
 
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from ..revision import (
 
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    NULL_REVISION,
 
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)
 
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from ..revisionspec import (
 
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    RevisionInfo,
 
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    RevisionSpec,
 
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    )
 
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def valid_git_sha1(hex):
 
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    """Check if `hex` is a validly formatted Git SHA1.
 
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    :param hex: Hex string to validate
 
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    :return: Boolean
 
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    """
 
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    import binascii
 
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    try:
 
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        binascii.unhexlify(hex)
 
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    except TypeError:
 
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        return False
 
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    except binascii.Error:
 
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        return False
 
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    else:
 
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        return True
 
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class RevisionSpec_git(RevisionSpec):
 
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    """Selects a revision using a Subversion revision number."""
 
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    help_txt = """Selects a revision using a Git revision sha1.
 
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    """
 
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    prefix = 'git:'
 
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    wants_revision_history = False
 
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    def _lookup_git_sha1(self, branch, sha1):
 
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        from .errors import (
 
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            GitSmartRemoteNotSupported,
 
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            )
 
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        from .mapping import (
 
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            default_mapping,
 
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            )
 
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        bzr_revid = getattr(branch.repository, "lookup_foreign_revision_id",
 
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                              default_mapping.revision_id_foreign_to_bzr)(sha1)
 
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        try:
 
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            if branch.repository.has_revision(bzr_revid):
 
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                return RevisionInfo.from_revision_id(branch, bzr_revid)
 
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        except GitSmartRemoteNotSupported:
 
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            return RevisionInfo(branch, None, bzr_revid)
 
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        raise InvalidRevisionSpec(self.user_spec, branch)
 
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    def __nonzero__(self):
 
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        # The default implementation uses branch.repository.has_revision()
 
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        if self.rev_id is None:
 
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            return False
 
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        if self.rev_id == NULL_REVISION:
 
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            return False
 
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        return True
 
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    def _find_short_git_sha1(self, branch, sha1):
 
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        from .mapping import (
 
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            ForeignGit,
 
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            mapping_registry,
 
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            )
 
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        parse_revid = getattr(branch.repository, "lookup_bzr_revision_id",
 
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                              mapping_registry.parse_revision_id)
 
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        with branch.repository.lock_read():
 
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            graph = branch.repository.get_graph()
 
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            for revid, _ in graph.iter_ancestry([branch.last_revision()]):
 
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                if revid == NULL_REVISION:
 
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                    continue
 
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                try:
 
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                    foreign_revid, mapping = parse_revid(revid)
 
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                except InvalidRevisionId:
 
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                    continue
 
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                if not isinstance(mapping.vcs, ForeignGit):
 
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                    continue
 
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                if foreign_revid.startswith(sha1):
 
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                    return RevisionInfo.from_revision_id(branch, revid)
 
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            raise InvalidRevisionSpec(self.user_spec, branch)
 
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    def _match_on(self, branch, revs):
 
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        loc = self.spec.find(':')
 
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        git_sha1 = self.spec[loc+1:].encode("utf-8")
 
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        if len(git_sha1) > 40 or not valid_git_sha1(git_sha1):
 
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            raise InvalidRevisionSpec(self.user_spec, branch)
 
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        from . import (
 
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            lazy_check_versions,
 
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            )
 
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        lazy_check_versions()
 
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        if len(git_sha1) == 40:
 
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            return self._lookup_git_sha1(branch, git_sha1)
 
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        else:
 
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            return self._find_short_git_sha1(branch, git_sha1)
 
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    def needs_branch(self):
 
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        return True
 
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    def get_branch(self):
 
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        return None