$ git clone -n https://src.fedoraproject.org/rpms/rust-gsk4_0.8.git /var/lib/mock/f42-build-side-1-3511163-46047/root/chroot_tmpdir/scmroot/rust-gsk4_0.8
Cloning into '/var/lib/mock/f42-build-side-1-3511163-46047/root/chroot_tmpdir/scmroot/rust-gsk4_0.8'...
$ git fetch origin 9cacbf6f3b17c778e179e36348d9020f4a14e050:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gsk4_0.8
 * [new ref]         9cacbf6f3b17c778e179e36348d9020f4a14e050 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cacbf6 compat package no longer needed