$ git clone -n https://src.fedoraproject.org/rpms/rust-gio-sys0.20.git /var/lib/mock/f45-build-41858-786/root/chroot_tmpdir/scmroot/rust-gio-sys0.20
Cloning into '/var/lib/mock/f45-build-41858-786/root/chroot_tmpdir/scmroot/rust-gio-sys0.20'...
$ git fetch origin 6ee27b3e24958ac43eebdc49497c1bef3a4fbca2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gio-sys0.20
 * [new ref]         6ee27b3e24958ac43eebdc49497c1bef3a4fbca2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ee27b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild