$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-options.git /var/lib/mock/f38-build-side-42-init-devel-835933-28392/root/chroot_tmpdir/scmroot/rust-cargo-options
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-835933-28392/root/chroot_tmpdir/scmroot/rust-cargo-options'...
$ git fetch origin 7911c54a7d3eaee6ae02d09a5c6095aaf9a0ed37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-options
 * [new ref]         7911c54a7d3eaee6ae02d09a5c6095aaf9a0ed37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7911c54 Added the README