$ git clone -n https://src.fedoraproject.org/rpms/libwebp.git /var/lib/mock/f45-build-43645-804/root/chroot_tmpdir/scmroot/libwebp
Cloning into '/var/lib/mock/f45-build-43645-804/root/chroot_tmpdir/scmroot/libwebp'...
$ git fetch origin 7b6f6c730000153a3a009c09c40bad79725ab27d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwebp
 * [new ref]         7b6f6c730000153a3a009c09c40bad79725ab27d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b6f6c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild