$ git clone -n https://src.fedoraproject.org/rpms/iaxclient.git /var/lib/mock/f41-build-785937-13590/root/chroot_tmpdir/scmroot/iaxclient
Cloning into '/var/lib/mock/f41-build-785937-13590/root/chroot_tmpdir/scmroot/iaxclient'...
$ git fetch origin 9eba610e7b57f25cddbd9382b027de441f1ed9ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iaxclient
 * [new ref]         9eba610e7b57f25cddbd9382b027de441f1ed9ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9eba610 Eliminate use of obsolete %patchN syntax (#2283636)