$ git clone -n https://src.fedoraproject.org/rpms/ilmbase.git /var/lib/mock/f41-build-785936-13590/root/chroot_tmpdir/scmroot/ilmbase
Cloning into '/var/lib/mock/f41-build-785936-13590/root/chroot_tmpdir/scmroot/ilmbase'...
$ git fetch origin 3a0391053d64cc1cea0d70d4b791d6e85257d12d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ilmbase
 * [new ref]         3a0391053d64cc1cea0d70d4b791d6e85257d12d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a03910 Eliminate use of obsolete %patchN syntax (#2283636)