Add tools to extract license information from system images

tools/librem5-mount-rootfs.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 Purism SPC
+# SPDX-License-Identifier: GPL-3.0+
+# Author: David Boddie <david.boddie@puri.sm>
+
+import locale
+import os
+import shlex
+import subprocess
+import sys
+
+
+if __name__ == '__main__':
+
+    if len(sys.argv) != 3:
+        sys.stderr.write('Usage: %s <librem5.img disk image> '
+                         '<mount point>\n' % sys.argv[0])
+        sys.exit(1)
+
+    image = sys.argv[1]
+    mount_point = sys.argv[2]
+
+    s = subprocess.Popen(['fdisk', '--units=sectors', '-l', shlex.quote(image)],
+                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    if s.wait() != 0:
+        sys.stderr.write('Error: %s\n' % str(s.stderr.read().rstrip(),
+                                             locale.getpreferredencoding()))
+        sys.exit(1)
+
+    for line in s.stdout.readlines():
+        line = line.strip()
+        if line.startswith(b'librem5.img2'):
+            start = int(line.split()[1])
+
+    offset = start * 512
+
+    if not os.path.isdir(mount_point):
+        os.mkdir(mount_point)
+
+    result = os.system('mount -o offset=%i %s %s' % (
+        offset, shlex.quote(image), shlex.quote(mount_point)))
+
+    if result != 0:
+        sys.exit(1)
+
+    # Add sources to the /etc/apt/sources.list file.
+    file_name = os.path.join(mount_point, 'etc', 'apt', 'sources.list')
+
+    lines = []
+    sources = set()
+
+    for line in open(file_name).readlines():
+        lines.append(line)
+        if line.startswith('deb-src '):
+            sources.add(line[8:])
+
+    f = open(file_name, 'w')
+
+    for line in lines:
+        f.write(line)
+        if line.startswith('deb '):
+            if line[4:] not in sources:
+                f.write('deb-src ' + line[4:])
+
+    f.close()
+
+    # Enter the chroot and update apt.
+
+    if os.system('chroot %s apt update' % shlex.quote(mount_point)) != 0:
+        sys.exit(1)
+
+    print('Now run:')
+    print('dpkg-status-summary.py [-d] <release name> %s '
+          '<output directory>' % shlex.quote(mount_point))
+
+    sys.exit()