$ git clone -n https://src.fedoraproject.org/rpms/rust-glutin.git /var/lib/mock/f40-build-2176189-51078/root/chroot_tmpdir/scmroot/rust-glutin
Cloning into '/var/lib/mock/f40-build-2176189-51078/root/chroot_tmpdir/scmroot/rust-glutin'...
$ git fetch origin cd354d47601f9d371b4a950b39eb53323125fd73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glutin
 * [new ref]         cd354d47601f9d371b4a950b39eb53323125fd73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd354d4 Update to 0.31.2 (rhbz#2245430)