$ git clone -n https://src.fedoraproject.org/rpms/rust-cookie_store.git /var/lib/mock/f45-build-40973-778/root/chroot_tmpdir/scmroot/rust-cookie_store
Cloning into '/var/lib/mock/f45-build-40973-778/root/chroot_tmpdir/scmroot/rust-cookie_store'...
$ git fetch origin cfb3c2e5de2d9319df9b28f391f80a41f4842dbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cookie_store
 * [new ref]         cfb3c2e5de2d9319df9b28f391f80a41f4842dbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfb3c2e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild