scripts: Add build-deb to build a Debian package

Expects a yaml file such as:

dsc_url: "https://snapshot.debian.org/archive/debian/20250416T143525Z/pool/main/h/hello/hello_2.10-5.dsc"
dsc_sha256sum: "319f8c377eb48597798b699f72ab853f3439a991583ddd51bf94b415373ffdfe"
debdiff_file: "hello_2.10-5qcom1.debdiff"
suite: "trixie"

Signed-off-by: Loïc Minier <[email protected]>

Author: lool

scripts/build-deb.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python3
+# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+# SPDX-License-Identifier: BSD-3-Clause
+
+import argparse
+import hashlib
+import os
+import subprocess
+import shutil
+import tempfile
+import yaml
+
+# Parse command-line arguments
+parser = argparse.ArgumentParser(
+    description="Build a Debian source package with a debdiff."
+)
+parser.add_argument(
+    '--config',
+    type=str,
+    help='Path to the YAML configuration file'
+)
+args = parser.parse_args()
+
+# Load configuration from YAML file
+with open(args.config, 'r') as f:
+    config = yaml.safe_load(f)
+
+# Create a temporary directory
+temp_dir = tempfile.mkdtemp()
+
+# Download the original Debian source package using dget
+dsc_url = config['dsc_url']
+subprocess.run(
+    ['dget', '-d', dsc_url],
+    cwd=temp_dir,
+    check=True
+)
+print("✅ Original source package downloaded successfully.")
+
+# Determine the .dsc file name
+dsc_file = os.path.join(temp_dir, os.path.basename(dsc_url))
+
+# Verify the SHA256 checksum of the .dsc file
+with open(dsc_file, 'rb') as f:
+    file_data = f.read()
+    sha256sum = hashlib.sha256(file_data).hexdigest()
+
+expected_sha256 = config['dsc_sha256sum']
+if sha256sum != expected_sha256:
+    raise ValueError(
+        f"SHA256 checksum does not match!\n"
+        f"Expected: {expected_sha256}\n"
+        f"Actual:   {sha256sum}"
+    )
+print("✅ Checksum of original source package matched.")
+
+# Unpack the source package
+subprocess.run(
+    ['dpkg-source', '-x', dsc_file],
+    cwd=temp_dir,
+    check=True
+)
+
+# Find the unpacked directory (assumes it's the only directory created)
+unpacked_dirs = [
+    d for d in os.listdir(temp_dir)
+    if os.path.isdir(os.path.join(temp_dir, d))
+]
+if not unpacked_dirs:
+    raise RuntimeError("No unpacked source directory found.")
+unpacked_dir = os.path.join(temp_dir, unpacked_dirs[0])
+
+# Apply the debdiff
+debdiff_path = config.get('debdiff_file')
+if debdiff_path:
+    if not os.path.isabs(debdiff_path):
+        config_dir = os.path.dirname(args.config)
+        debdiff_path = os.path.abspath(os.path.join(config_dir, debdiff_path))
+    subprocess.run(
+        ['patch', '-p1', '-i', debdiff_path],
+        cwd=unpacked_dir,
+        check=True
+    )
+    print("✅ Debdiff applied successfully.")
+else:
+    print("⚠️  No debdiff provided.")
+
+# Build the resulting source package using sbuild
+suite = config['suite']
+subprocess.run(
+    ['sbuild', '--verbose', '-d', suite, '--no-clean-source',
+     '--dpkg-source-opt=--no-check'],
+    cwd=unpacked_dir,
+    check=True
+)
+
+print("✅ Source package built successfully.")
+