$ git clone -n https://src.fedoraproject.org/rpms/cockpit-machines.git /var/lib/mock/f40-build-2587440-62495/root/chroot_tmpdir/scmroot/cockpit-machines
Cloning into '/var/lib/mock/f40-build-2587440-62495/root/chroot_tmpdir/scmroot/cockpit-machines'...
$ git fetch origin 8136a642af1184d5ec1d62ac47d2693107f579b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-machines
 * [new ref]         8136a642af1184d5ec1d62ac47d2693107f579b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8136a64 [packit] 309 upstream release