$ git clone -n https://src.fedoraproject.org/rpms/pdfbox.git /var/lib/mock/f38-build-side-42-init-devel-686872-26759/root/chroot_tmpdir/scmroot/pdfbox
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-686872-26759/root/chroot_tmpdir/scmroot/pdfbox'...
$ git fetch origin 624560860add3ae9524d17e9f87f093bc7e91fc2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfbox
 * [new ref]         624560860add3ae9524d17e9f87f093bc7e91fc2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6245608 Depend on compat versions of activation and XML bind