comparison hgext/narrow/narrowdirstate.py @ 36079:a2a6e724d61a

narrow: import experimental extension from narrowhg revision cb51d673e9c5

Adjustments:
 * renamed src to hgext/narrow
 * marked extension experimental
 * added correct copyright header where it was missing
 * updated hgrc extension enable line in library.sh
 * renamed library.sh to narrow-library.sh
 * dropped all files from repo root as they're not interesting
 * dropped test-pyflakes.t, test-check-code.t and test-check-py3-compat.t
 * renamed remaining tests to all be test-narrow-* when they didn't already
 * fixed test-narrow-expanddirstate.t to refer to narrow and not narrowhg
 * fixed tests that wanted `update -C .` instead of `merge --abort`
 * corrected a two-space indent in narrowspec.py
 * added a missing _() in narrowcommands.py
 * fixed imports to pass the import checker
 * narrow only adds its --include and --exclude to clone if sparse isn't
   enabled to avoid breaking test-duplicateoptions.py. This is a kludge,
   and we'll need to come up with a better solution in the future.

These were more or less the minimum to import something that would
pass tests and not create a bunch of files we'll never use.

Changes I intend to make as followups:
 * rework the test-narrow-*-tree.t tests to use the new testcases
   functionality in run-tests.py
 * remove lots of monkeypatches of core things

Differential Revision: https://phab.mercurial-scm.org/D1974

36079:a2a6e724d61a

# narrowdirstate.py - extensions to mercurial dirstate to support narrow clones
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    dirstate,
    error,
    extensions,
    match as matchmod,
    util as hgutil,
)

from . import narrowspec

def setup(repo):
    """Add narrow spec dirstate ignore, block changes outside narrow spec."""

    def walk(orig, self, match, subrepos, unknown, ignored, full=True,
             narrowonly=True):
        if narrowonly:
            narrowmatch = repo.narrowmatch()
            match = matchmod.intersectmatchers(match, narrowmatch)
        return orig(self, match, subrepos, unknown, ignored, full)

    extensions.wrapfunction(dirstate.dirstate, 'walk', walk)

    # Prevent adding files that are outside the sparse checkout
    editfuncs = ['normal', 'add', 'normallookup', 'copy', 'remove', 'merge']
    for func in editfuncs:
        def _wrapper(orig, self, *args):
            dirstate = repo.dirstate
            narrowmatch = repo.narrowmatch()
            for f in args:
                if f is not None and not narrowmatch(f) and f not in dirstate:
                    raise error.Abort(_("cannot track '%s' - it is outside " +
                        "the narrow clone") % f)
            return orig(self, *args)
        extensions.wrapfunction(dirstate.dirstate, func, _wrapper)

    def filterrebuild(orig, self, parent, allfiles, changedfiles=None):
        if changedfiles is None:
            # Rebuilding entire dirstate, let's filter allfiles to match the
            # narrowspec.
            allfiles = [f for f in allfiles if repo.narrowmatch()(f)]
        orig(self, parent, allfiles, changedfiles)

    extensions.wrapfunction(dirstate.dirstate, 'rebuild', filterrebuild)

    def _narrowbackupname(backupname):
        assert 'dirstate' in backupname
        return backupname.replace('dirstate', narrowspec.FILENAME)

    def restorebackup(orig, self, tr, backupname):
        self._opener.rename(_narrowbackupname(backupname), narrowspec.FILENAME,
                            checkambig=True)
        orig(self, tr, backupname)

    extensions.wrapfunction(dirstate.dirstate, 'restorebackup', restorebackup)

    def savebackup(orig, self, tr, backupname):
        orig(self, tr, backupname)

        narrowbackupname = _narrowbackupname(backupname)
        self._opener.tryunlink(narrowbackupname)
        hgutil.copyfile(self._opener.join(narrowspec.FILENAME),
                        self._opener.join(narrowbackupname), hardlink=True)

    extensions.wrapfunction(dirstate.dirstate, 'savebackup', savebackup)

    def clearbackup(orig, self, tr, backupname):
        orig(self, tr, backupname)
        self._opener.unlink(_narrowbackupname(backupname))

    extensions.wrapfunction(dirstate.dirstate, 'clearbackup', clearbackup)