$ git clone -n https://src.fedoraproject.org/rpms/ustr.git /var/lib/mock/f41-build-1042233-18998/root/chroot_tmpdir/scmroot/ustr
Cloning into '/var/lib/mock/f41-build-1042233-18998/root/chroot_tmpdir/scmroot/ustr'...
$ git fetch origin 16a7d3fb0ab0b12740aff97f31b0364a751ee9fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ustr
 * [new ref]         16a7d3fb0ab0b12740aff97f31b0364a751ee9fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16a7d3f Eliminate use of obsolete %patchN syntax (#2283636)