$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk4_0.8.git /var/lib/mock/f42-build-side-1-3497648-45961/root/chroot_tmpdir/scmroot/rust-gdk4_0.8
Cloning into '/var/lib/mock/f42-build-side-1-3497648-45961/root/chroot_tmpdir/scmroot/rust-gdk4_0.8'...
$ git fetch origin 73eaabb17e72cd96bb878525a037689769310e4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk4_0.8
 * [new ref]         73eaabb17e72cd96bb878525a037689769310e4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73eaabb compat package no longer needed