$ git clone -n https://src.fedoraproject.org/rpms/kmag.git /var/lib/mock/f39-build-1566408-37588/root/chroot_tmpdir/scmroot/kmag
Cloning into '/var/lib/mock/f39-build-1566408-37588/root/chroot_tmpdir/scmroot/kmag'...
$ git fetch origin f13fbcf8db067190c2d1b2547d0db544894735c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kmag
 * [new ref]         f13fbcf8db067190c2d1b2547d0db544894735c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f13fbcf 23.08.2