$ git clone -n https://src.fedoraproject.org/rpms/kcalc.git /var/lib/mock/f40-build-2146411-50889/root/chroot_tmpdir/scmroot/kcalc
Cloning into '/var/lib/mock/f40-build-2146411-50889/root/chroot_tmpdir/scmroot/kcalc'...
$ git fetch origin 5f18675807abeb4003471a0c72a65edab39d2bb1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcalc
 * [new ref]         5f18675807abeb4003471a0c72a65edab39d2bb1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f18675 24.01.85