$ git clone -n https://src.fedoraproject.org/rpms/rust-num-bigint-dig.git /var/lib/mock/f40-build-2073345-49358/root/chroot_tmpdir/scmroot/rust-num-bigint-dig
Cloning into '/var/lib/mock/f40-build-2073345-49358/root/chroot_tmpdir/scmroot/rust-num-bigint-dig'...
$ git fetch origin 90ce8f31b0ce99c1edb27d7ac779b08b066d5fa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-bigint-dig
 * [new ref]         90ce8f31b0ce99c1edb27d7ac779b08b066d5fa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90ce8f3 Update to version 0.7.1