$ git clone -n https://src.fedoraproject.org/rpms/rust-drop_bomb.git /var/lib/mock/f40-build-2231898-53314/root/chroot_tmpdir/scmroot/rust-drop_bomb
Cloning into '/var/lib/mock/f40-build-2231898-53314/root/chroot_tmpdir/scmroot/rust-drop_bomb'...
$ git fetch origin 5dea897c7ec5f49190dbefaeca2c452c7500ed22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-drop_bomb
 * [new ref]         5dea897c7ec5f49190dbefaeca2c452c7500ed22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5dea897 Initial import (#2247723)