$ git clone -n https://src.fedoraproject.org/rpms/kf6-breeze-icons.git /var/lib/mock/f42-build-side-1-3497649-45961/root/chroot_tmpdir/scmroot/kf6-breeze-icons
Cloning into '/var/lib/mock/f42-build-side-1-3497649-45961/root/chroot_tmpdir/scmroot/kf6-breeze-icons'...
$ git fetch origin 728493c525b4e4e7be5caccba41f66e8d816ee38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-breeze-icons
 * [new ref]         728493c525b4e4e7be5caccba41f66e8d816ee38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 728493c Split out Fedora installer icon to separate subpackage