$ git clone -n https://src.fedoraproject.org/rpms/kcron.git /var/lib/mock/f39-build-1856540-42425/root/chroot_tmpdir/scmroot/kcron
Cloning into '/var/lib/mock/f39-build-1856540-42425/root/chroot_tmpdir/scmroot/kcron'...
$ git fetch origin f2a7bd5b60e0fef69e5cb09e0b96f601a28b007a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcron
 * [new ref]         f2a7bd5b60e0fef69e5cb09e0b96f601a28b007a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2a7bd5 23.08.3