$ git clone -n https://src.fedoraproject.org/rpms/ksirk.git /var/lib/mock/f40-build-2726226-73122/root/chroot_tmpdir/scmroot/ksirk
Cloning into '/var/lib/mock/f40-build-2726226-73122/root/chroot_tmpdir/scmroot/ksirk'...
$ git fetch origin 668cbb4d61d292b144579de4ed69274bb4003c40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksirk
 * [new ref]         668cbb4d61d292b144579de4ed69274bb4003c40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 668cbb4 24.02.2