$ git clone -n https://src.fedoraproject.org/rpms/rust-gio-sys0.17.git /var/lib/mock/f41-build-side-1-2923815-34983/root/chroot_tmpdir/scmroot/rust-gio-sys0.17
Cloning into '/var/lib/mock/f41-build-side-1-2923815-34983/root/chroot_tmpdir/scmroot/rust-gio-sys0.17'...
$ git fetch origin e157b2b71c5e27e5e934e372fc2586471b4fec98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gio-sys0.17
 * [new ref]         e157b2b71c5e27e5e934e372fc2586471b4fec98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e157b2b compat package no longer needed