$ git clone -n https://src.fedoraproject.org/rpms/rust-either.git /var/lib/mock/f45-build-41407-782/root/chroot_tmpdir/scmroot/rust-either
Cloning into '/var/lib/mock/f45-build-41407-782/root/chroot_tmpdir/scmroot/rust-either'...
$ git fetch origin 8b1ac6f316df1f6fab550afc766a92d656e41500:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-either
 * [new ref]         8b1ac6f316df1f6fab550afc766a92d656e41500 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b1ac6f Update to version 1.17.0