$ git clone -n https://src.fedoraproject.org/rpms/libwebp.git /var/lib/mock/f41-build-side-1-2647719-27311/root/chroot_tmpdir/scmroot/libwebp
Cloning into '/var/lib/mock/f41-build-side-1-2647719-27311/root/chroot_tmpdir/scmroot/libwebp'...
$ git fetch origin d575397062ebbd4b07021913d8906554608b8038:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwebp
 * [new ref]         d575397062ebbd4b07021913d8906554608b8038 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d575397 Added libwebp explicit dependency to libwebp-tools package