$ git clone -n https://src.fedoraproject.org/rpms/rust-proptest-derive.git /var/lib/mock/f40-build-2101443-50503/root/chroot_tmpdir/scmroot/rust-proptest-derive
Cloning into '/var/lib/mock/f40-build-2101443-50503/root/chroot_tmpdir/scmroot/rust-proptest-derive'...
$ git fetch origin d32e03ef575cda6c415549abad49cbc41e9fedfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proptest-derive
 * [new ref]         d32e03ef575cda6c415549abad49cbc41e9fedfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d32e03e Update to version 0.4.0; Fixes RHBZ#2235211