$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-msgpack.git /var/lib/mock/f41-build-side-1-2753410-31222/root/chroot_tmpdir/scmroot/php-pecl-msgpack
Cloning into '/var/lib/mock/f41-build-side-1-2753410-31222/root/chroot_tmpdir/scmroot/php-pecl-msgpack'...
$ git fetch origin e619c08d33d85c0806781f5484e845ab447ab45a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-msgpack
 * [new ref]         e619c08d33d85c0806781f5484e845ab447ab45a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e619c08 update conf