view hgext/git/dirstate.py @ 48598:a6f16ec07ed7

stream-clone: add a explicit test for format change during stream clone

They are different kind of requirements, the one which impact the data storage
and are relevant to the files being streamed and the one which does not. For
example some requirements are only relevant to the working copy, like sparse, or
dirstate-v2.

Since they are irrelevant to the content being streamed, they do not prevent the
receiving side to use streaming clone and mercurial skip adverting them over
the wire and, ideally, within the bundle.

In addition, this let the client decide to use whichever format it desire for
the part that does not affect the store itself. So the configuration related to
these format are used as normal when doing a streaming clone.

In practice, the feature was not really tested and is badly broken with bundle-2,
since the requirements are not filtered out from the stream bundle.

So we start with adding simple tests as a good base before the fix and adjust
the feature.

Differential Revision: https://phab.mercurial-scm.org/D12029

from __future__ import absolute_import

import contextlib
import errno
import os

from mercurial.node import sha1nodeconstants
from mercurial import (
    error,
    extensions,
    match as matchmod,
    pycompat,
    scmutil,
    util,
)
from mercurial.interfaces import (
    dirstate as intdirstate,
    util as interfaceutil,
)

from . import gitutil

pygit2 = gitutil.get_pygit2()


def readpatternfile(orig, filepath, warn, sourceinfo=False):
    if not (b'info/exclude' in filepath or filepath.endswith(b'.gitignore')):
        return orig(filepath, warn, sourceinfo=False)
    result = []
    warnings = []
    with open(filepath, b'rb') as fp:
        for l in fp:
            l = l.strip()
            if not l or l.startswith(b'#'):
                continue
            if l.startswith(b'!'):
                warnings.append(b'unsupported ignore pattern %s' % l)
                continue
            if l.startswith(b'/'):
                result.append(b'rootglob:' + l[1:])
            else:
                result.append(b'relglob:' + l)
    return result, warnings


extensions.wrapfunction(matchmod, b'readpatternfile', readpatternfile)


_STATUS_MAP = {}
if pygit2:
    _STATUS_MAP = {
        pygit2.GIT_STATUS_CONFLICTED: b'm',
        pygit2.GIT_STATUS_CURRENT: b'n',
        pygit2.GIT_STATUS_IGNORED: b'?',
        pygit2.GIT_STATUS_INDEX_DELETED: b'r',
        pygit2.GIT_STATUS_INDEX_MODIFIED: b'n',
        pygit2.GIT_STATUS_INDEX_NEW: b'a',
        pygit2.GIT_STATUS_INDEX_RENAMED: b'a',
        pygit2.GIT_STATUS_INDEX_TYPECHANGE: b'n',
        pygit2.GIT_STATUS_WT_DELETED: b'r',
        pygit2.GIT_STATUS_WT_MODIFIED: b'n',
        pygit2.GIT_STATUS_WT_NEW: b'?',
        pygit2.GIT_STATUS_WT_RENAMED: b'a',
        pygit2.GIT_STATUS_WT_TYPECHANGE: b'n',
        pygit2.GIT_STATUS_WT_UNREADABLE: b'?',
        pygit2.GIT_STATUS_INDEX_MODIFIED | pygit2.GIT_STATUS_WT_MODIFIED: b'm',
    }


@interfaceutil.implementer(intdirstate.idirstate)
class gitdirstate(object):
    def __init__(self, ui, root, gitrepo):
        self._ui = ui
        self._root = os.path.dirname(root)
        self.git = gitrepo
        self._plchangecallbacks = {}
        # TODO: context.poststatusfixup is bad and uses this attribute
        self._dirty = False

    def p1(self):
        try:
            return self.git.head.peel().id.raw
        except pygit2.GitError:
            # Typically happens when peeling HEAD fails, as in an
            # empty repository.
            return sha1nodeconstants.nullid

    def p2(self):
        # TODO: MERGE_HEAD? something like that, right?
        return sha1nodeconstants.nullid

    def setparents(self, p1, p2=None):
        if p2 is None:
            p2 = sha1nodeconstants.nullid
        assert p2 == sha1nodeconstants.nullid, b'TODO merging support'
        self.git.head.set_target(gitutil.togitnode(p1))

    @util.propertycache
    def identity(self):
        return util.filestat.frompath(
            os.path.join(self._root, b'.git', b'index')
        )

    def branch(self):
        return b'default'

    def parents(self):
        # TODO how on earth do we find p2 if a merge is in flight?
        return self.p1(), sha1nodeconstants.nullid

    def __iter__(self):
        return (pycompat.fsencode(f.path) for f in self.git.index)

    def items(self):
        for ie in self.git.index:
            yield ie.path, None  # value should be a DirstateItem

    # py2,3 compat forward
    iteritems = items

    def __getitem__(self, filename):
        try:
            gs = self.git.status_file(filename)
        except KeyError:
            return b'?'
        return _STATUS_MAP[gs]

    def __contains__(self, filename):
        try:
            gs = self.git.status_file(filename)
            return _STATUS_MAP[gs] != b'?'
        except KeyError:
            return False

    def status(self, match, subrepos, ignored, clean, unknown):
        listclean = clean
        # TODO handling of clean files - can we get that from git.status()?
        modified, added, removed, deleted, unknown, ignored, clean = (
            [],
            [],
            [],
            [],
            [],
            [],
            [],
        )
        gstatus = self.git.status()
        for path, status in gstatus.items():
            path = pycompat.fsencode(path)
            if not match(path):
                continue
            if status == pygit2.GIT_STATUS_IGNORED:
                if path.endswith(b'/'):
                    continue
                ignored.append(path)
            elif status in (
                pygit2.GIT_STATUS_WT_MODIFIED,
                pygit2.GIT_STATUS_INDEX_MODIFIED,
                pygit2.GIT_STATUS_WT_MODIFIED
                | pygit2.GIT_STATUS_INDEX_MODIFIED,
            ):
                modified.append(path)
            elif status == pygit2.GIT_STATUS_INDEX_NEW:
                added.append(path)
            elif status == pygit2.GIT_STATUS_WT_NEW:
                unknown.append(path)
            elif status == pygit2.GIT_STATUS_WT_DELETED:
                deleted.append(path)
            elif status == pygit2.GIT_STATUS_INDEX_DELETED:
                removed.append(path)
            else:
                raise error.Abort(
                    b'unhandled case: status for %r is %r' % (path, status)
                )

        if listclean:
            observed = set(
                modified + added + removed + deleted + unknown + ignored
            )
            index = self.git.index
            index.read()
            for entry in index:
                path = pycompat.fsencode(entry.path)
                if not match(path):
                    continue
                if path in observed:
                    continue  # already in some other set
                if path[-1] == b'/':
                    continue  # directory
                clean.append(path)

        # TODO are we really always sure of status here?
        return (
            False,
            scmutil.status(
                modified, added, removed, deleted, unknown, ignored, clean
            ),
        )

    def flagfunc(self, buildfallback):
        # TODO we can do better
        return buildfallback()

    def getcwd(self):
        # TODO is this a good way to do this?
        return os.path.dirname(
            os.path.dirname(pycompat.fsencode(self.git.path))
        )

    def normalize(self, path):
        normed = util.normcase(path)
        assert normed == path, b"TODO handling of case folding: %s != %s" % (
            normed,
            path,
        )
        return path

    @property
    def _checklink(self):
        return util.checklink(os.path.dirname(pycompat.fsencode(self.git.path)))

    def copies(self):
        # TODO support copies?
        return {}

    # # TODO what the heck is this
    _filecache = set()

    def pendingparentchange(self):
        # TODO: we need to implement the context manager bits and
        # correctly stage/revert index edits.
        return False

    def write(self, tr):
        # TODO: call parent change callbacks

        if tr:

            def writeinner(category):
                self.git.index.write()

            tr.addpending(b'gitdirstate', writeinner)
        else:
            self.git.index.write()

    def pathto(self, f, cwd=None):
        if cwd is None:
            cwd = self.getcwd()
        # TODO core dirstate does something about slashes here
        assert isinstance(f, bytes)
        r = util.pathto(self._root, cwd, f)
        return r

    def matches(self, match):
        for x in self.git.index:
            p = pycompat.fsencode(x.path)
            if match(p):
                yield p

    def set_clean(self, f, parentfiledata):
        """Mark a file normal and clean."""
        # TODO: for now we just let libgit2 re-stat the file. We can
        # clearly do better.

    def set_possibly_dirty(self, f):
        """Mark a file normal, but possibly dirty."""
        # TODO: for now we just let libgit2 re-stat the file. We can
        # clearly do better.

    def walk(self, match, subrepos, unknown, ignored, full=True):
        # TODO: we need to use .status() and not iterate the index,
        # because the index doesn't force a re-walk and so `hg add` of
        # a new file without an intervening call to status will
        # silently do nothing.
        r = {}
        cwd = self.getcwd()
        for path, status in self.git.status().items():
            if path.startswith('.hg/'):
                continue
            path = pycompat.fsencode(path)
            if not match(path):
                continue
            # TODO construct the stat info from the status object?
            try:
                s = os.stat(os.path.join(cwd, path))
            except OSError as e:
                if e.errno != errno.ENOENT:
                    raise
                continue
            r[path] = s
        return r

    def savebackup(self, tr, backupname):
        # TODO: figure out a strategy for saving index backups.
        pass

    def restorebackup(self, tr, backupname):
        # TODO: figure out a strategy for saving index backups.
        pass

    def set_tracked(self, f):
        uf = pycompat.fsdecode(f)
        if uf in self.git.index:
            return False
        index = self.git.index
        index.read()
        index.add(uf)
        index.write()
        return True

    def add(self, f):
        index = self.git.index
        index.read()
        index.add(pycompat.fsdecode(f))
        index.write()

    def drop(self, f):
        index = self.git.index
        index.read()
        fs = pycompat.fsdecode(f)
        if fs in index:
            index.remove(fs)
            index.write()

    def set_untracked(self, f):
        index = self.git.index
        index.read()
        fs = pycompat.fsdecode(f)
        if fs in index:
            index.remove(fs)
            index.write()
            return True
        return False

    def remove(self, f):
        index = self.git.index
        index.read()
        index.remove(pycompat.fsdecode(f))
        index.write()

    def copied(self, path):
        # TODO: track copies?
        return None

    def prefetch_parents(self):
        # TODO
        pass

    def update_file(self, *args, **kwargs):
        # TODO
        pass

    @contextlib.contextmanager
    def parentchange(self):
        # TODO: track this maybe?
        yield

    def addparentchangecallback(self, category, callback):
        # TODO: should this be added to the dirstate interface?
        self._plchangecallbacks[category] = callback

    def clearbackup(self, tr, backupname):
        # TODO
        pass

    def setbranch(self, branch):
        raise error.Abort(
            b'git repos do not support branches. try using bookmarks'
        )