$ git clone -n https://src.fedoraproject.org/rpms/kst.git /var/lib/mock/f39-build-1815512-41837/root/chroot_tmpdir/scmroot/kst
Cloning into '/var/lib/mock/f39-build-1815512-41837/root/chroot_tmpdir/scmroot/kst'...
$ git fetch origin 75695191160660b6b47567aa7e2ae5b163066b48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kst
 * [new ref]         75695191160660b6b47567aa7e2ae5b163066b48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7569519 cfitsio rebuild