hgext/infinitepush/bundleparts.py

phabricator: convert phabhunk and phabchange keys to bytes when finalising

I thought I had included this code already but I'd missed it out.  One of the
disadvantages of attrs is that all the keys are unicode strings on py3, but we
need them to be byte strings.

Differential Revision: https://phab.mercurial-scm.org/D7066

# Copyright 2017 Facebook, 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 (
    bundle2,
    changegroup,
    error,
    extensions,
    node as nodemod,
    pycompat,
    revsetlang,
    util,
)

from . import common

isremotebooksenabled = common.isremotebooksenabled

scratchbranchparttype = b'b2x:infinitepush'


def getscratchbranchparts(repo, peer, outgoing, ui, bookmark):
    if not outgoing.missing:
        raise error.Abort(_(b'no commits to push'))

    if scratchbranchparttype not in bundle2.bundle2caps(peer):
        raise error.Abort(
            _(b'no server support for %r') % scratchbranchparttype
        )

    _validaterevset(
        repo, revsetlang.formatspec(b'%ln', outgoing.missing), bookmark
    )

    supportedversions = changegroup.supportedoutgoingversions(repo)
    # Explicitly avoid using '01' changegroup version in infinitepush to
    # support general delta
    supportedversions.discard(b'01')
    cgversion = min(supportedversions)
    _handlelfs(repo, outgoing.missing)
    cg = changegroup.makestream(repo, outgoing, cgversion, b'push')

    params = {}
    params[b'cgversion'] = cgversion
    if bookmark:
        params[b'bookmark'] = bookmark
        # 'prevbooknode' is necessary for pushkey reply part
        params[b'bookprevnode'] = b''
        bookmarks = repo._bookmarks
        if bookmark in bookmarks:
            params[b'bookprevnode'] = nodemod.hex(bookmarks[bookmark])

    # Do not send pushback bundle2 part with bookmarks if remotenames extension
    # is enabled. It will be handled manually in `_push()`
    if not isremotebooksenabled(ui):
        params[b'pushbackbookmarks'] = b'1'

    parts = []

    # .upper() marks this as a mandatory part: server will abort if there's no
    #  handler
    parts.append(
        bundle2.bundlepart(
            scratchbranchparttype.upper(),
            advisoryparams=pycompat.iteritems(params),
            data=cg,
        )
    )

    return parts


def _validaterevset(repo, revset, bookmark):
    """Abort if the revs to be pushed aren't valid for a scratch branch."""
    if not repo.revs(revset):
        raise error.Abort(_(b'nothing to push'))
    if bookmark:
        # Allow bundle with many heads only if no bookmark is specified
        heads = repo.revs(b'heads(%r)', revset)
        if len(heads) > 1:
            raise error.Abort(
                _(b'cannot push more than one head to a scratch branch')
            )


def _handlelfs(repo, missing):
    '''Special case if lfs is enabled

    If lfs is enabled then we need to call prepush hook
    to make sure large files are uploaded to lfs
    '''
    try:
        lfsmod = extensions.find(b'lfs')
        lfsmod.wrapper.uploadblobsfromrevs(repo, missing)
    except KeyError:
        # Ignore if lfs extension is not enabled
        return


class copiedpart(object):
    """a copy of unbundlepart content that can be consumed later"""

    def __init__(self, part):
        # copy "public properties"
        self.type = part.type
        self.id = part.id
        self.mandatory = part.mandatory
        self.mandatoryparams = part.mandatoryparams
        self.advisoryparams = part.advisoryparams
        self.params = part.params
        self.mandatorykeys = part.mandatorykeys
        # copy the buffer
        self._io = util.stringio(part.read())

    def consume(self):
        return

    def read(self, size=None):
        if size is None:
            return self._io.read()
        else:
            return self._io.read(size)