Implement iso package listing into a CSV file

For IP disclosure proposes create a csv file listing the deb packages included in the ISO file.

Story: 2011336
Task: 51624

TEST PLAN

PASS: executing the script against a valid input file produces the expected CSV file
PASS: executing the script against invalid input file prints warning without producing a failure

Change-Id: Ibdda4efe1208e7145da34b468c2cc3490c05d397

scripts/build-iso.sh

@@ -36,3 +36,6 @@ if $SIGN_ISO_FORMAL ; then
 fi
 notice "building STD ISO"
 stx_docker_cmd $DRY_RUN_ARG "build-image $build_img_args"
+
+python3 $(dirname "$0")/lib/packages_parser.py --input "$BUILD_HOME"/localdisk/workdir/starlingx/packages.yaml --csv-dest "$BUILD_HOME"/localdisk/deploy/iso-packages.csv || true
+# errors on the script are ignored

scripts/lib/packages_parser.py

@@ -0,0 +1,134 @@
+#!/usr/bin/env python3
+
+"""
+Copyright (c) 2014-2025 Wind River Systems, Inc.
+
+SPDX-License-Identifier: Apache-2.0
+
+Parses the packages.yaml into a CSV file for IP disclosure proposes
+
+The packages.yaml lists the packages present into the ISO
+
+It was more fields that we are interested, such as the dependencies
+
+This script only cares about the package name, the version and the filename.
+
+The packages.yaml lives in: <build_prj>/localdisk/workdir/starlingx/packages.yaml
+
+Usage example: packages_parser.py --input packages.yaml --csv-dest iso-packages.csv
+"""
+
+import argparse
+import csv
+import logging
+import sys
+
+
+def removeprefix(text, prefix):
+    """
+    str.removeprefix() and str.removesuffix() was introduced on python 3.9
+    for older versions we need to implement it ourselfs
+    implementation from the PEP that introduced it
+    https://peps.python.org/pep-0616/#specification
+    """
+    if text.startswith(prefix):
+        return text[len(prefix) :]
+    return text[:]
+
+
+def removesuffix(text, suffix):
+    # suffix='' should not call self[:-0].
+    if suffix and text.endswith(suffix):
+        return text[: -len(suffix)]
+    return text[:]
+
+
+def read_yaml(pkgs_filename):
+    """parses simple key file yaml, only parsing some fields
+
+    the packages.yaml follows the following structure
+
+    acl:
+        arch: ''
+        ver: 2.2.53-10
+        filename: acl_2.2.53-10_amd64.deb
+        deps:
+        - libacl1
+        - libc6
+        pkgarch: ''
+        provs: []
+    [...]
+
+    we only care about the package name, version and filename
+
+    Args:
+        pkgs_filename packages.yaml filename
+
+    Returns:
+        list of the csv rows (package_name, package_version, package_filename)
+    """
+    curr_key = ""
+    old_key = ""
+    curr_ver = ""
+    curr_file = ""
+    rows = []
+    with open(pkgs_filename, mode="r", encoding="utf-8") as f:
+        for line in f:
+            ls = line.rstrip()  # line wo trailing spaces (to remove the newline char)
+            if ls.endswith(":") and not ls.startswith(" "):  # parent key (pkg)
+                curr_key = removesuffix(ls, ":")
+                curr_ver = ""  # found a new package, reset the other fields
+                curr_file = ""
+            elif ls.startswith(" "):  # values within a pkg
+                if ls.strip().startswith("filename:"):
+                    curr_file = removeprefix(ls.strip(), "filename: ")
+                elif ls.strip().startswith("ver:"):
+                    curr_ver = removeprefix(ls.strip(), "ver: ")
+            if len(curr_ver) > 0 and len(curr_file) > 0 and old_key != curr_key:
+                # all the fields of a new package are field, add it results
+                row = [curr_key, curr_ver, curr_file]
+                rows.append(row)
+                old_key = curr_key
+    if len(rows) > 0:
+        return rows
+    raise ValueError(
+        "Parser Error! Input file is malformed, filename='%s'" % pkgs_filename
+    )
+
+
+def write_csv(dest_filename, headers, rows):
+    with open(dest_filename, mode="w", encoding="utf-8") as f:
+        writer = csv.writer(f)
+        writer.writerow(headers)
+        writer.writerows(rows)
+
+
+def main(pkgs_filename, dest_csv_filename):
+    logging.info(
+        "starting the script, input=%s, output=%s", pkgs_filename, dest_csv_filename
+    )
+    csv_headers = ["package_name", "version", "filename"]
+    rows = read_yaml(pkgs_filename)
+    logging.info("yaml parsed successfully, found %s packages", len(rows))
+    logging.info("writing the results into the CSV file!")
+    write_csv(dest_csv_filename, csv_headers, rows)
+    logging.info("Done!")
+
+
+if __name__ == "__main__":
+    cliparser = argparse.ArgumentParser(
+        prog="PackagesDotYamlParser",
+        description="Convert the packages.yaml into a csv file",
+    )
+    cliparser.add_argument("--input", required=True, help="packages.yaml file location")
+    cliparser.add_argument("--csv-dest", required=True, help="csv output filename")
+    args = cliparser.parse_args()
+    logging.basicConfig(
+        format="%(asctime)s - %(levelname)s - %(message)s",
+        level=logging.INFO,
+    )
+    try:
+        main(args.input, args.csv_dest)
+    except Exception as e:
+        logging.error("Fail to execute the script, exception message:\n%s", e)
+        sys.exit(1)