$ git clone -n https://src.fedoraproject.org/rpms/pidgin.git /var/lib/mock/f41-build-1046925-19101/root/chroot_tmpdir/scmroot/pidgin
Cloning into '/var/lib/mock/f41-build-1046925-19101/root/chroot_tmpdir/scmroot/pidgin'...
$ git fetch origin 303fbfb5cf4857049743068c0b98e50cf54c50b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pidgin
 * [new ref]         303fbfb5cf4857049743068c0b98e50cf54c50b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 303fbfb Eliminate use of obsolete %patchN syntax (#2283636)