$ git clone -n https://src.fedoraproject.org/rpms/rust-tame-index.git /var/lib/mock/f40-build-2288489-55789/root/chroot_tmpdir/scmroot/rust-tame-index
Cloning into '/var/lib/mock/f40-build-2288489-55789/root/chroot_tmpdir/scmroot/rust-tame-index'...
$ git fetch origin 1b46f10e7e20fcb2aa47e0d635ffab706e3f0dd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tame-index
 * [new ref]         1b46f10e7e20fcb2aa47e0d635ffab706e3f0dd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b46f10 Initial import (#2243016)