$ git clone -n https://src.fedoraproject.org/rpms/kblocks.git /var/lib/mock/f39-build-1858787-42457/root/chroot_tmpdir/scmroot/kblocks
Cloning into '/var/lib/mock/f39-build-1858787-42457/root/chroot_tmpdir/scmroot/kblocks'...
$ git fetch origin 127d791a5c577081786d19bd5dc1990a9b832b97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblocks
 * [new ref]         127d791a5c577081786d19bd5dc1990a9b832b97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 127d791 23.08.3