$ git clone -n https://src.fedoraproject.org/rpms/libmatemixer.git /var/lib/mock/f40-build-784386-133362/root/chroot_tmpdir/scmroot/libmatemixer
Cloning into '/var/lib/mock/f40-build-784386-133362/root/chroot_tmpdir/scmroot/libmatemixer'...
$ git fetch origin ee0390af833d4430bc9d554ea41c289480e7960a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmatemixer
 * [new ref]         ee0390af833d4430bc9d554ea41c289480e7960a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee0390a update to 1.28