diff --git a/README.md b/README.md
index 7eca0f8..98723fb 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ Table of Contents
 * [Generating OmniBOR Docs with Bomtrace3](#Generating-OmniBOR-Docs-with-Bomtrace3)
 * [Generating OmniBOR Docs with Bomtrace2](#Generating-OmniBOR-Docs-with-Bomtrace2)
 * [Generating OmniBOR ADGs for Debian or RPM Packages with Bomtrace2](#Generating-OmniBOR-ADGs-for-Debian-or-RPM-Packages-with-Bomtrace2)
+* [Generating SPDX Docs](#Generating-SPDX-Docs)
 * [Reducing Storage of Generated OmniBOR Docs](#Reducing-Storage-of-Generated-OmniBOR-Docs)
 * [Manipulating OmniBOR Artifact Tree with Grafting and Pruning](#Manipulating-OmniBOR-Artifact-Tree-with-Grafting-and-Pruning)
 * [Creating Index Database for Debian Source Packages](#Creating-Index-Database-for-Debian-Source-Packages)
@@ -473,6 +474,43 @@ lrwxrwxrwx. 1 root root     98 Oct 17 05:28 sysstat-debugsource-11.7.3-6.el8.x86
 [root@e8281323a4d6 rpm-src-dir]#
 ```
 
+Generating SPDX Docs
+--------------------
+
+Bomsh is able to generate SPDX SBOM documents for built Debian/RPM packages.
+When rebuilding Debian/RPM packages using the bomsh_rebuild_deb.py or
+bomsh_rebuild_rpm.py script, adding the --bomsh_spdx option will build the
+SPDX documents.
+
+Also for the bomsh_rebuild_deb.py script, the --deb_build_script can be used
+to specify a script file to build the Debian packages, without specifying the
+-f or --buildinfo_file option. Note that this script must copy the built
+Debian packages and the source tarball files to expected location for later
+use by the bomsh_spdx_deb.py script to generate the SPDX documents.
+An example bomsh-openosc-deb.sh script file has been provided to illustrate
+such Debian-build script.
+
+    $ git clone URL-of-this-git-repo bomsh
+    $ wget https://vault.centos.org/8-stream/AppStream/Source/SPackages/sysstat-11.7.3-7.el8.src.rpm
+    $ bomsh/scripts/bomsh_rebuild_rpm.py -c alma+epel-8-x86_64 --docker_image_base almalinux:8 -s sysstat-11.7.3-7.el8.src.rpm -d bomsh/scripts/sample_sysstat_cvedb.json -o outdir --syft_sbom --bomsh_spdx --mock_option="--no-bootstrap-image --define 'packager BOMSH user $(id -un) at $(hostname)'"
+    $ grep -B1 -A3 CVElist outdir/bomsher_out/bomsh_logfiles/bomsh_search_jsonfile-details.json
+    $
+    $ # the above should take only a few minutes, and the below may take tens of minutes
+    $ wget https://buildinfos.debian.net/buildinfo-pool/s/sysstat/sysstat_11.7.3-1_all-amd64-source.buildinfo
+    $ bomsh/scripts/bomsh_rebuild_deb.py -f sysstat_11.7.3-1_all-amd64-source.buildinfo -d bomsh/scripts/sample_sysstat_cvedb.json -o outdir2 --syft_sbom --bomsh_spdx --mmdebstrap_no_cleanup
+    $ grep -B1 -A3 CVElist outdir2/bomsher_out/bomsh_logfiles/bomsh_search_jsonfile-details.json
+    $
+    $ # specify a Debian build script to build Debian packages
+    $ bomsh/scripts/bomsh_rebuild_deb.py --deb_build_script bomsh/scripts/bomsh-openosc-deb.sh -o openosc-outdir --syft_sbom --bomsh_spdx
+    $ ls -tl openosc-outdir/bomsher_out/bomsh_sbom/
+
+Currently only SPDX v2.3 version SBOM documents are supported.
+
+Bomsh is able to generate SPDX documents for generic images too, like
+ISO/OVA image files. This usually involves an image unbundler or unpacking
+tool to unpack the image to individual binary files. The bomsh_spdx_image.py
+script is created for this purpose. This feature is for advanced users only.
+
 Reducing Storage of Generated OmniBOR Docs
 -----------------------------------------
 
diff --git a/scripts/bomsh-openosc-deb.sh b/scripts/bomsh-openosc-deb.sh
new file mode 100755
index 0000000..fb7bca3
--- /dev/null
+++ b/scripts/bomsh-openosc-deb.sh
@@ -0,0 +1,28 @@
+#! /usr/bin/bash
+
+# This is an example Debian build script to illustrace the usage of
+# the --deb_build_script option of the bomsh_rebuild_deb.py script.
+# This shell script builds the OpenOSC Debian *.deb package files.
+# It also copies the built *.deb files to expected directory.
+# It also copies the src tarball files to expected directory.
+# These copied *.deb and tarball files are later used by the
+# bomsh_spdx_deb.py script to generate SPDX documents.
+
+# pwd should always be the /out/bomsher_out directory inside the docker container
+git clone https://github.com/cisco/OpenOSC.git
+cd OpenOSC
+autoreconf -vfi
+./configure
+make deb
+# also the workspace should not be deleted or cleaned after the build
+
+# must copy the generated *.deb files to the /out/bomsher_out/debs directory
+cp ../*.deb ../debs/
+
+# must copy the src tarball files to the /out/bomsher_out/bomsh_logfiles directory
+# also need to generate the src tarball first
+dpkg-source -b .
+cp ../*.dsc ../bomsh_logfiles/
+cp ../*.tar.gz ../bomsh_logfiles/
+
+# In the end, everything is ready for the bomsh_spdx_deb.py script
diff --git a/scripts/bomsh_create_bom.py b/scripts/bomsh_create_bom.py
index ca92822..2db15ad 100755
--- a/scripts/bomsh_create_bom.py
+++ b/scripts/bomsh_create_bom.py
@@ -812,6 +812,8 @@ def unbundle_package(pkgfile, destdir=''):
         cmd = "rm -rf " + destdir + " ; mkdir -p " + destdir + " ; dpkg-deb -xv " + pkgfile + " " + destdir + " || true"
     elif pkgfile[-4:] == ".tgz" or pkgfile[-7:] in (".tar.gz", ".tar.xz") or pkgfile[-8:] == ".tar.bz2":
         cmd = "rm -rf " + destdir + " ; mkdir -p " + destdir + " ; tar -xf " + pkgfile + " -C " + destdir + " || true"
+    elif pkgfile[-4:] == ".jar":
+        cmd = "rm -rf " + destdir + " ; mkdir -p " + destdir + " ; unzip " + pkgfile + " -d " + destdir + " || true"
     else:
         print("Unsupported package format in " + pkgfile + " file, skipping it.")
         return ''
diff --git a/scripts/bomsh_index_ws.py b/scripts/bomsh_index_ws.py
index d843038..03d0db1 100755
--- a/scripts/bomsh_index_ws.py
+++ b/scripts/bomsh_index_ws.py
@@ -414,6 +414,8 @@ def get_installed_pkg_info(package):
     :param package: the installed package name
     returns a list of lines of the package info.
     '''
+    if not package:
+        return []
     if g_package_type == "deb":
         return get_installed_deb_pkg_info(package)
     return get_installed_rpm_pkg_info(package)
@@ -655,13 +657,13 @@ def get_deb_source_control_file():
         verbose("from buildinfo_file " + args.buildinfo_file + " we get dsc filename: " + dsc_filename)
     if dsc_filename:
         return get_dsc_source_control_file_with_filename(dsc_filename)
-    cmd = 'ls bomsh_logfiles/*.dsc || true'
+    cmd = 'ls bomsh_logfiles/*.dsc 2>/dev/null || true'
     output = get_shell_cmd_output(cmd)
     if output:
         return output.splitlines()[0]
     if not (g_chroot_dir and os.path.exists(g_chroot_dir)):
         return ''
-    cmd = 'ls ' + g_chroot_dir + '/*.dsc || true'
+    cmd = 'ls ' + g_chroot_dir + '/*.dsc 2>/dev/null || true'
     output = get_shell_cmd_output(cmd)
     if output:
         return output.splitlines()[0]
@@ -688,13 +690,13 @@ def get_deb_source_tarball_files():
     They are supposed to have been copied to bomsh_logfiles directory or g_chroot_dir.
     returns a list of tarball files.
     '''
-    cmd = 'ls bomsh_logfiles/*.tar.* || true'
+    cmd = 'ls bomsh_logfiles/*.tar.* 2>/dev/null || true'
     output = get_shell_cmd_output(cmd)
     if output:
         return output.splitlines()
     if not (g_chroot_dir and os.path.exists(g_chroot_dir)):
         return []
-    cmd = 'ls ' + g_chroot_dir + '/*.tar.* || true'
+    cmd = 'ls ' + g_chroot_dir + '/*.tar.* 2>/dev/null || true'
     output = get_shell_cmd_output(cmd)
     if output:
         return output.splitlines()
diff --git a/scripts/bomsh_rebuild_deb.py b/scripts/bomsh_rebuild_deb.py
index 35d1140..8b6d289 100755
--- a/scripts/bomsh_rebuild_deb.py
+++ b/scripts/bomsh_rebuild_deb.py
@@ -175,21 +175,35 @@ def fix_broken_symlinks(bomsher_outdir):
 # Bomtrace/Bomsh debrebuild run to generate OmniBOR documents
 # if BASELINE_REBUILD is not empty, then it will not use bomtrace2 to run debrebuild, that is, the baseline run.
 # if SRC_TAR_DIR is not empty, then the python script must have copied tarball and .dsc file into the bomsher_in directory.
-CMD if [ "${SRC_TAR_DIR}" ]; then srctardir_param="--srctardir=/out/bomsher_in" ; fi ; \\
+CMD mkdir -p /out/bomsher_out ; cd /out/bomsher_out ; mkdir -p bomsh_logfiles ; \\
     if [ -z "${BASELINE_REBUILD}" ]; then bomtrace_cmd="/tmp/bomtrace2 -w /tmp/bomtrace_watched_programs -c /tmp/bomtrace.conf -o /tmp/bomsh_hook_strace_logfile " ; fi ; \\
-    mkdir -p /out/bomsher_out ; cd /out/bomsher_out ; \\
-    if [ "${MM_NO_CLEANUP}" ]; then cp /usr/bin/mmdebstrap /usr/bin/mmdebstrap.bak ; echo "Patching mmdebstrap for no-cleanup." ; \\
-    cp /usr/bin/mmdebstrap ./ ; patch -p0 < mmdebstrap_patch_file ; cp mmdebstrap /usr/bin/mmdebstrap ; fi ; \\
-    echo $bomtrace_cmd debrebuild $srctardir_param --buildresult=./debs --builder=mmdebstrap /out/bomsher_in/$BUILDINFO_FILE ; \\
-    # Run strace to collect artifact dependency fragments (ADF) for debrebuild ; \\
-    $bomtrace_cmd debrebuild $srctardir_param --buildresult=./debs --builder=mmdebstrap /out/bomsher_in/$BUILDINFO_FILE ; \\
+    if [ "${BUILDINFO_FILE}" ]; then \\
+        chroot_param="--chroot_dir /tmp/bomsh-mmroot" ; \\
+        if [ "${SRC_TAR_DIR}" ]; then srctardir_param="--srctardir=/out/bomsher_in" ; fi ; \\
+        if [ "${MM_NO_CLEANUP}" ]; then cp /usr/bin/mmdebstrap /usr/bin/mmdebstrap.bak ; echo "Patching mmdebstrap for no-cleanup." ; \\
+        cp /usr/bin/mmdebstrap ./ ; patch -p0 < mmdebstrap_patch_file ; cp mmdebstrap /usr/bin/mmdebstrap ; fi ; \\
+        echo $bomtrace_cmd debrebuild $srctardir_param --buildresult=./debs --builder=mmdebstrap /out/bomsher_in/$BUILDINFO_FILE ; \\
+        # Run strace to collect artifact dependency fragments (ADF) for debrebuild ; \\
+        $bomtrace_cmd debrebuild $srctardir_param --buildresult=./debs --builder=mmdebstrap /out/bomsher_in/$BUILDINFO_FILE ; \\
+        cp /tmp/bomsh-mmroot/etc/os-release bomsh_logfiles/mock-os-release ; \\
+    elif [ "${BUILD_SCRIPT}" ]; then \\
+        mkdir -p debs ; \\
+        # Run strace to collect artifact dependency fragments (ADF) for debian build script ; \\
+        echo $bomtrace_cmd /out/bomsher_in/$BUILD_SCRIPT >&2 ; \\
+        $bomtrace_cmd /out/bomsher_in/$BUILD_SCRIPT ; \\
+        cp /etc/os-release bomsh_logfiles/mock-os-release ; \\
+        #cp /tmp/bomsh_hook_* ./ ; \\
+    else \\
+        echo "Nothing to build." >&2 ; \\
+    fi ; \\
     if [ "${BASELINE_REBUILD}" ]; then exit 0 ; fi ; \\
     debfiles=`for i in debs/*.deb ; do  echo -n $i, ; done | sed 's/.$//'` ; \\
     rm -rf omnibor omnibor_dir ; mv .omnibor omnibor ; mkdir -p bomsh_logfiles ; cp -f /tmp/bomsh_hook_*logfile* bomsh_logfiles/ ; \\
-    if [ "${MM_NO_CLEANUP}" ]; then index_db_param="--pkg_db_file /tmp/bomsh-index-pkg-db.json" ; \\
+    # Indexing the build workspace if needed ; \\
+    if [ "${MM_NO_CLEANUP}" ] || [ "${BUILD_SCRIPT}" ] ; then index_db_param="--pkg_db_file /tmp/bomsh-index-pkg-db.json" ; \\
     # Create the package index database for prov_pkg metadata of source files ; \\
-    /tmp/bomsh_index_ws.py --chroot_dir /tmp/bomsh-mmroot -p $debfiles -r /tmp/bomsh_hook_raw_logfile.sha1 --package_type deb ; \\
-    cp /tmp/bomsh-mmroot/etc/os-release bomsh_logfiles/mock-os-release ; \\
+    echo /out/bomsh_index_ws.py $chroot_param -p $debfiles -r /tmp/bomsh_hook_raw_logfile.sha1 --package_type deb ; \\
+    /tmp/bomsh_index_ws.py $chroot_param -p $debfiles -r /tmp/bomsh_hook_raw_logfile.sha1 --package_type deb ; \\
     cp /tmp/bomsh-index-* bomsh_logfiles ; fi ; \\
     # Create the OmniBOR manifest document and metadata database ; \\
     /tmp/bomsh_create_bom.py -b omnibor_dir -r /tmp/bomsh_hook_raw_logfile.sha1 $index_db_param ; \\
@@ -240,9 +254,16 @@ def run_docker(buildinfo_file, output_dir):
     bomsher_outdir = get_or_create_dir(os.path.join(output_dir, "bomsher_out"))
     # The bomsher_in dir is also the docker build work directory
     create_dockerfile(bomsher_indir)
-    os.system("cp -f " + buildinfo_file + " " + bomsher_indir)
     docker_cmd = 'docker run --cap-add MKNOD --cap-add SYS_ADMIN --cap-add=SYS_PTRACE -it --rm'
-    docker_cmd += ' -e BUILDINFO_FILE=' + os.path.basename(buildinfo_file)
+    if args.buildinfo_file:
+        os.system("cp -f " + args.buildinfo_file + " " + bomsher_indir)
+        docker_cmd += ' -e BUILDINFO_FILE=' + os.path.basename(args.buildinfo_file)
+    elif args.deb_build_script:
+        os.system("cp -f " + args.deb_build_script + " " + bomsher_indir)
+        docker_cmd += ' -e BUILD_SCRIPT=' + os.path.basename(args.deb_build_script)
+    else:
+        verbose("No idea how to build debian packages. Do nothing.")
+        return
     # Set appropriate parameters to run docker
     if args.src_tar_dir:
         tardir_base = os.path.basename(args.src_tar_dir)
@@ -265,7 +286,7 @@ def run_docker(buildinfo_file, output_dir):
     if args.bomsh_spdx:
         # Generate SPDX SBOM document with the bomsh_spdx_rpm.py tool
         docker_cmd += ' -e BOMSH_SPDX=1'
-    docker_cmd += ' -v ' + output_dir + ':/out $(docker build -t bomsher-deb -q ' + bomsher_indir + ')'
+    docker_cmd += ' -v ' + output_dir + ':/out $(docker build -t bomsher-deb2 -q ' + bomsher_indir + ')'
     verbose("==== Here is the docker run command: " + docker_cmd, LEVEL_1)
     os.system(docker_cmd)
     fix_broken_symlinks(bomsher_outdir)
@@ -293,6 +314,8 @@ def rtd_parse_options():
                     help = "Debian package's .buildinfo file generated from a previous reproducible build")
     parser.add_argument('--docker_image_base',
                     help = "the base docker image to start with")
+    parser.add_argument('--deb_build_script',
+                    help = "the script to build debian packages")
     parser.add_argument('-o', '--output_dir',
                     help = "the output directory to store rebuilt .deb files and Bomsh/OmniBOR documents, the default is current dir")
     parser.add_argument('-d', '--cve_db_file',
@@ -321,8 +344,8 @@ def rtd_parse_options():
     # Parse the command line arguments
     args = parser.parse_args()
 
-    if not (args.buildinfo_file):
-        print ("Please specify the buildinfo file with -f option!")
+    if not (args.buildinfo_file or args.deb_build_script):
+        print ("Please specify the buildinfo file with -f option or the debian build script with --deb_build_script option!")
         print ("")
         parser.print_help()
         sys.exit()
diff --git a/scripts/bomsh_spdx_deb.py b/scripts/bomsh_spdx_deb.py
index 0e4893e..26d8892 100755
--- a/scripts/bomsh_spdx_deb.py
+++ b/scripts/bomsh_spdx_deb.py
@@ -124,6 +124,19 @@
 DB_FN = "bomsh_search_jsonfile-details.json"
 BOM_MAPPING_FN = "bomsh_search_jsonfile-bom-mappings.json"
 
+#
+# Helper routines
+#########################
+def verbose(string, level=1):
+    """
+    Prints information to stdout depending on the verbose level.
+    :param string: String to be printed
+    :param level: Unsigned Integer, listing the verbose level
+    """
+    if args.verbose >= level:
+        # print to stdout
+        print(string)
+
 def get_or_create_dir(destdir):
     """
     Create a directory if it does not exist. otherwise, return it directly
@@ -275,6 +288,9 @@ def parse_pkg_info(pkg_info_array):
     # Our return value
     pkg_info = dict()
 
+    if not pkg_info_array:
+        return pkg_info
+
     # Set a description list to hold all the lines of the description
     desc_list = list()
 
@@ -521,7 +537,6 @@ def analyze_files(rpm_file, unpack_dir):
             # and then there is the linux "file" command
 
             file_types=[get_spdx_file_type(f)],
-            file_types=[FileType.SOURCE],
             checksums=[
                 Checksum(ChecksumAlgorithm.SHA1, file_sha1),
                 Checksum(ChecksumAlgorithm.SHA256, file_sha256),
@@ -566,6 +581,8 @@ def build_basic_spdx_package(pkg, pkg_db, os_rel_data):
         return None
 
     pkg_data = parse_pkg_info(db_entry['pkg_info'])
+    if not pkg_data:
+        return None
 
     (pkg_name, pkg_ver, pkg_rel, pkg_arch) = deb_pkg_nvra(pkg_data)
 
@@ -594,18 +611,26 @@ def spdx_add_src_pkg_dependency(spdx_doc, gitoid, sbom_db, pkg_db, os_rel_data,
 
     # If we currently don't have a package entry, add one.
     for pkg in pkg_list:
+        # If we ended up with a null package name then skip it.
+        if not pkg:
+            verbose("Skipping null package...")
+            continue
         # The summerization of the sbom detail output leaves the following string in the list
         # of packages.  We don't want that in our output
         if pkg == "UNKNOWN_COMPONENT_VERSION":
+            verbose("Skipping unknown-component-version package...")
             continue
         # All files that were generated during a build will not have an origination package.
         # They are listed under the package name that starts with "GENERATED "
         # The input files used to generate that file will have an origination pkg and those will be captured elsewhere
         if pkg.startswith('DERIVED_PKG '):
+            verbose("Skipping derived package " + pkg)
             continue
         package = pkg_exists(spdx_doc, pkg)
         if not package:
             package = build_basic_spdx_package(pkg, pkg_db, os_rel_data)
+            if not package: # this is probably empty package ""
+                continue
             spdx_doc.packages += [package]
 
         # Then we add the the dependency relationship.
diff --git a/scripts/bomsh_spdx_rpm.py b/scripts/bomsh_spdx_rpm.py
index 024bd82..c2179ac 100755
--- a/scripts/bomsh_spdx_rpm.py
+++ b/scripts/bomsh_spdx_rpm.py
@@ -118,6 +118,19 @@
 DB_FN = "bomsh_search_jsonfile-details.json"
 BOM_MAPPING_FN = "bomsh_search_jsonfile-bom-mappings.json"
 
+#
+# Helper routines
+#########################
+def verbose(string, level=1):
+    """
+    Prints information to stdout depending on the verbose level.
+    :param string: String to be printed
+    :param level: Unsigned Integer, listing the verbose level
+    """
+    if args.verbose >= level:
+        # print to stdout
+        print(string)
+
 def get_or_create_dir(destdir):
     """
     Create a directory if it does not exist. otherwise, return it directly
@@ -557,14 +570,20 @@ def spdx_add_src_pkg_dependency(spdx_doc, gitoid, sbom_db, pkg_db, os_rel_data,
 
     # If we currently don't have a package entry, add one.
     for pkg in pkg_list:
+        # If we ended up with a null package name then skip it.
+        if not pkg:
+            verbose("Skipping null package...")
+            continue
         # The summerization of the sbom detail output leaves the following string in the list
         # of packages.  We don't want that in our output
         if pkg == "UNKNOWN_COMPONENT_VERSION":
+            verbose("Skipping unknown-component-version package...")
             continue
         # All files that were generated during a build will not have an origination package.
         # They are listed under the package name that starts with "GENERATED "
         # The input files used to generate that file will have an origination pkg and those will be captured elsewhere
         if pkg.startswith('DERIVED_PKG '):
+            verbose("Skipping derived package " + pkg)
             continue
         package = pkg_exists(spdx_doc, pkg)
         if not package: