$ git clone -n https://src.fedoraproject.org/rpms/rust-serial_test0.6.git /var/lib/mock/f41-build-side-1-3134915-39764/root/chroot_tmpdir/scmroot/rust-serial_test0.6
Cloning into '/var/lib/mock/f41-build-side-1-3134915-39764/root/chroot_tmpdir/scmroot/rust-serial_test0.6'...
$ git fetch origin c47822c408610a3a543d04159067f8cfd284e0ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serial_test0.6
 * [new ref]         c47822c408610a3a543d04159067f8cfd284e0ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c47822c compat package no longer needed