$ git clone -n https://src.fedoraproject.org/rpms/icedtea-web.git /var/lib/mock/f41-build-785923-13590/root/chroot_tmpdir/scmroot/icedtea-web
Cloning into '/var/lib/mock/f41-build-785923-13590/root/chroot_tmpdir/scmroot/icedtea-web'...
$ git fetch origin 625099d6274bb69c34423c933dafe31103a680da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icedtea-web
 * [new ref]         625099d6274bb69c34423c933dafe31103a680da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 625099d Eliminate use of obsolete %patchN syntax (#2283636)