$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk4-sys0.8.git /var/lib/mock/f42-build-side-1-3586870-46926/root/chroot_tmpdir/scmroot/rust-gdk4-sys0.8
Cloning into '/var/lib/mock/f42-build-side-1-3586870-46926/root/chroot_tmpdir/scmroot/rust-gdk4-sys0.8'...
$ git fetch origin 6aac77f07fd856c630ab8faa55bacaf9b9e9151a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk4-sys0.8
 * [new ref]         6aac77f07fd856c630ab8faa55bacaf9b9e9151a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6aac77f compat package no longer needed