$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-c.git /var/lib/mock/f41-build-810556-146782/root/chroot_tmpdir/scmroot/rust-cargo-c
Cloning into '/var/lib/mock/f41-build-810556-146782/root/chroot_tmpdir/scmroot/rust-cargo-c'...
$ git fetch origin ee4fb9efa2f392d29204710fc5206a85325a4fa5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-c
 * [new ref]         ee4fb9efa2f392d29204710fc5206a85325a4fa5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee4fb9e Update to version 0.9.32+cargo-0.79.0; Fixes RHBZ#2256180