$ git clone -n https://src.fedoraproject.org/rpms/glib2.git /var/lib/mock/f41-build-1200292-22413/root/chroot_tmpdir/scmroot/glib2
Cloning into '/var/lib/mock/f41-build-1200292-22413/root/chroot_tmpdir/scmroot/glib2'...
$ git fetch origin ddcd084633b758e6e4699f46e8167eab6ae49542:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glib2
 * [new ref]         ddcd084633b758e6e4699f46e8167eab6ae49542 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ddcd084 Drop manual byte compilation and call to marshalparser