$ git clone -n https://src.fedoraproject.org/rpms/cockpit-machines.git /var/lib/mock/f39-build-1550968-36959/root/chroot_tmpdir/scmroot/cockpit-machines
Cloning into '/var/lib/mock/f39-build-1550968-36959/root/chroot_tmpdir/scmroot/cockpit-machines'...
$ git fetch origin 3ecb8883339a0d9e01e7379c4213434c985df442:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-machines
 * [new ref]         3ecb8883339a0d9e01e7379c4213434c985df442 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ecb888 [packit] 301.1 upstream release