$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-sys.git /var/lib/mock/f40-build-2150150-50894/root/chroot_tmpdir/scmroot/rust-gdk-sys
Cloning into '/var/lib/mock/f40-build-2150150-50894/root/chroot_tmpdir/scmroot/rust-gdk-sys'...
$ git fetch origin 90631a431f5e572af3a1c2a13ab003a5e2902433:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-sys
 * [new ref]         90631a431f5e572af3a1c2a13ab003a5e2902433 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90631a4 Update to version 0.18.0; Fixes RHBZ#2231717