$ git clone -n https://src.fedoraproject.org/rpms/vakzination.git /var/lib/mock/f40-build-2145187-50880/root/chroot_tmpdir/scmroot/vakzination
Cloning into '/var/lib/mock/f40-build-2145187-50880/root/chroot_tmpdir/scmroot/vakzination'...
$ git fetch origin ccfdda9db102d8bbfc3cfcc358087c4c5a79c9e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vakzination
 * [new ref]         ccfdda9db102d8bbfc3cfcc358087c4c5a79c9e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ccfdda9 Rebuild