diff --git a/fluent-package/debug-package-converter.sh b/fluent-package/debug-package-converter.sh
new file mode 100755
index 00000000..f4cbc7b4
--- /dev/null
+++ b/fluent-package/debug-package-converter.sh
@@ -0,0 +1,114 @@
+#!/usr/bin/bash
+
+#
+# Helper script to generate package which
+# can enable debug verbose message in maintainer scripts.
+# It helps to trace internal behavior install/upgrade/remove
+# and so on.
+#
+# Usage: debug-package-converter.sh PATH_TO_DEB_OR_RPM
+#
+# e.g.
+# $ debug-package-converter.sh fluent-package-6.0.0-1.el8.x86_64.rpm
+# $ debug-package-converter.sh fluent-package_6.0.0-1_amd64.deb
+#
+# It repack to fluent-package-6.0.0-2.el8.x86_64.rpm or
+# fluent-package_6.0.0-2_amd64.deb.
+#
+
+set -e
+
+CLEANUP=1
+PACKAGE=""
+if [ -f "$1" ]; then
+    PACKAGE=$1
+fi
+if [ -z "$PACKAGE" ]; then
+    echo "No package"
+    exit 1
+fi
+
+PLATFORM_ID=$(cat /etc/os-release | grep '^ID=')
+case $PLATFORM_ID in
+    *rocky*|*almalinux*)
+        # rpmrebuild extract to $HOME/.tmp/rpmrebuild.NNN/work:
+        #
+        # /home/vagrant/.tmp/rpmrebuild.13056/work
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/PROCESSING
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.2
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.3
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.4
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.5
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.6
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/rpmrebuild_rpmqf.src.7
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/preamble.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/conflicts.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/obsoletes.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/provides.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/requires.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/suggests.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/enhances.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/recommends.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/supplements.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/description.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/files.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/files.in
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/triggers.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/pre.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/pretrans.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/post.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/posttrans.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/preun.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/postun.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/verifyscript.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/changelog.1
+        # /home/vagrant/.tmp/rpmrebuild.13056/work/root
+        # Example: "1.el9"
+        release=$(rpmquery --queryformat="%{Release}" -p $PACKAGE)
+        version=$(rpmquery --queryformat="%{Version}" -p $PACKAGE)
+        # Example: "1"
+        release_ver=$(echo $release | cut -d . -f1)
+        next_release_ver=$(($release_ver+1))
+        # Example: "2.el9"
+        next_release=$next_release_ver.$(echo $release | cut -d. -f2)
+        cat >/tmp/repack.sh<<'EOF';
+find $HOME/.tmp -name pre.1 | xargs sed -i -e 's,%pre -p /bin/sh,%pre -p /bin/sh\necho "%%pre: ('$1'): $1"\nset -x,'
+find $HOME/.tmp -name pre.1 | xargs sed -i -e '$s|$|\necho "%%pre '$1': $1 END"|g'
+find $HOME/.tmp -name pre.1 | xargs cat
+find $HOME/.tmp -name post.1 | xargs sed -i -e 's,%post -p /bin/sh,%post -p /bin/sh\necho "%%post ('$1'): $1"\nset -x,'
+find $HOME/.tmp -name post.1 | xargs sed -i -e '$s|$|\necho "%%post '$1': $1 END"|g'
+find $HOME/.tmp -name post.1 | xargs cat
+find $HOME/.tmp -name preun.1 | xargs sed -i -e 's,%preun -p /bin/sh,%preun -p /bin/sh\necho "%%preun ('$1'): $1"\nset -x,'
+find $HOME/.tmp -name preun.1 | xargs sed -i -e '$s|$|\necho "%%preun '$1': $1 END"|g'
+find $HOME/.tmp -name preun.1 | xargs cat
+find $HOME/.tmp -name postun.1 | xargs sed -i -e 's,%postun -p /bin/sh,%postun -p /bin/sh\necho "%%postun ('$1'): $1"\nset -x,'
+find $HOME/.tmp -name postun.1 | xargs sed -i -e '$s|$|\necho "%%postun '$1': $1 END"|g'
+find $HOME/.tmp -name postun.1 | xargs cat
+EOF
+        chmod +x /tmp/repack.sh
+        rpmrebuild --release=$next_release --modify="/tmp/repack.sh ${version}-${next_release_ver}" --package $PACKAGE
+        rm -f /tmp/repack.sh
+        ;;
+    *debian*|*ubuntu*)
+        rm -fr tmp
+        dpkg-deb -R $PACKAGE tmp
+        package=$(cat tmp/DEBIAN/control | grep "Package: " | sed -E "s/Package: (.+)/\1/")
+        architecture=$(cat tmp/DEBIAN/control | grep "Architecture: " | sed -E "s/Architecture: (.+)/\1/")
+        version=$(cat tmp/DEBIAN/control | grep "Version: " | sed -E "s/Version: ([0-9.]+)-([0-9]+)/\1/")
+        debian_version=$(cat tmp/DEBIAN/control | grep "Version: " | sed -E "s/Version: ([0-9.]+)-([0-9]+)/\2/")
+        sed -i -E "s/Version: ([0-9.]+)-([0-9]+)/Version: \1-$(($debian_version+1))/g" tmp/DEBIAN/control
+        next_release="$version-"$(($debian_version+1))
+        for d in prerm postrm preinst postinst; do
+            if [ -f tmp/DEBIAN/$d ]; then
+                sed -i -e "s/^set -e/set -ex\necho \"#=> $d $next_release: \$1 (\$2)\"/" tmp/DEBIAN/$d
+                echo "echo \"#<= $d $next_release: \$1 (\$2) END\"" >> tmp/DEBIAN/$d
+            fi
+        done
+        dpkg-deb --build tmp ${package}_${next_release}_${architecture}.deb
+        if [ $CLEANUP -eq 1 ]; then
+            rm -rf tmp
+        fi
+        ;;
+esac
+