$ git clone -n https://src.fedoraproject.org/rpms/pdftk-java.git /var/lib/mock/f41-build-1059841-19447/root/chroot_tmpdir/scmroot/pdftk-java
Cloning into '/var/lib/mock/f41-build-1059841-19447/root/chroot_tmpdir/scmroot/pdftk-java'...
$ git fetch origin 5bc2a42420866c68ea0fee662446549b75b65186:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdftk-java
 * [new ref]         5bc2a42420866c68ea0fee662446549b75b65186 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bc2a42 Eliminate use of obsolete %patchN syntax (#2283636)