$ git clone -n https://src.fedoraproject.org/rpms/rust-prost-types0.10.git /var/lib/mock/f42-build-side-1-3504347-45983/root/chroot_tmpdir/scmroot/rust-prost-types0.10
Cloning into '/var/lib/mock/f42-build-side-1-3504347-45983/root/chroot_tmpdir/scmroot/rust-prost-types0.10'...
$ git fetch origin 6e03a9e719757fbf26ec019fd88d58077feb96dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost-types0.10
 * [new ref]         6e03a9e719757fbf26ec019fd88d58077feb96dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e03a9e compat package no longer needed