$ git clone -n https://src.fedoraproject.org/rpms/rust-cbindgen.git /var/lib/mock/f40-build-2053935-49096/root/chroot_tmpdir/scmroot/rust-cbindgen
Cloning into '/var/lib/mock/f40-build-2053935-49096/root/chroot_tmpdir/scmroot/rust-cbindgen'...
$ git fetch origin e4e773f2b90e7278ba929d92c6341db53fd70dd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cbindgen
 * [new ref]         e4e773f2b90e7278ba929d92c6341db53fd70dd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4e773f Update to version 0.26.0; Fixes RHBZ#2234876