$ git clone -n https://src.fedoraproject.org/rpms/kcalc.git /var/lib/mock/f42-build-864077-172034/root/chroot_tmpdir/scmroot/kcalc
Cloning into '/var/lib/mock/f42-build-864077-172034/root/chroot_tmpdir/scmroot/kcalc'...
$ git fetch origin 9875d4706e4af77b603e98f28c8e40c75a67d342:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcalc
 * [new ref]         9875d4706e4af77b603e98f28c8e40c75a67d342 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9875d47 24.12.0