$ git clone -n https://src.fedoraproject.org/rpms/umbrello.git /var/lib/mock/f39-build-1642782-40220/root/chroot_tmpdir/scmroot/umbrello
Cloning into '/var/lib/mock/f39-build-1642782-40220/root/chroot_tmpdir/scmroot/umbrello'...
$ git fetch origin bcb4da2a3a3a0985af128e27cac82b075b440539:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/umbrello
 * [new ref]         bcb4da2a3a3a0985af128e27cac82b075b440539 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcb4da2 23.08.2