Add very basic support for symboled debugging on android

sky/tools/android_library_cacher.py

Index: sky/tools/android_library_cacher.py
diff --git a/sky/tools/android_library_cacher.py b/sky/tools/android_library_cacher.py
new file mode 100755
index 0000000000000000000000000000000000000000..def60e85a28cb428aa6a5e315005b8b5e29205b9
--- /dev/null
+++ b/sky/tools/android_library_cacher.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import re
+import sys
+import os
+import logging
+import subprocess
+
+
+# TODO(eseidel): This should be shared with adb_gdb
+def main():
+    logging.basicConfig(level=logging.INFO)
+    parser = argparse.ArgumentParser(
+        description='Pull all libraries used by a pid on android into a cache.')
+    parser.add_argument('cache_root', type=str)
+    parser.add_argument('pid', type=int)
+    args = parser.parse_args()
+
+    if not os.path.exists(args.cache_root):
+        os.makedirs(args.cache_root)
+
+    subprocess.check_call(['adb', 'root'])
+
+    library_regexp = re.compile(r'(?P<library_path>/system/.*\.so)')

[abarth-chromium, 2015/01/16 21:17:20]

lib?

+    cat_maps_cmd = ['adb', 'shell', 'cat', '/proc/%s/maps' % args.pid]
+    maps_lines = subprocess.check_output(cat_maps_cmd).strip().split('\n')
+    # adb shell doesn't return the return code from the shell?
+    if not maps_lines or 'No such file or directory' in maps_lines[0]:
+        print 'Failed to get maps for pid %s on device.' % args.pid
+        sys.exit(1)
+
+    def library_from_line(line):
+        result = library_regexp.search(line)
+        if not result:
+            return None
+        return result.group('library_path')
+
+    to_pull = sorted(set(filter(None, map(library_from_line, maps_lines))))
+    for library_path in to_pull:
+        # Not using os.path.join since library_path is absolute.
+        dest_file = os.path.normpath("%s/%s" % (args.cache_root, library_path))
+        dest_dir = os.path.dirname(dest_file)
+        if not os.path.exists(dest_dir):
+            os.makedirs(dest_dir)
+        print '%s -> %s' % (library_path, dest_file)
+        pull_cmd = ['adb', 'pull', library_path, dest_file]
+        subprocess.check_call(pull_cmd)
+
+
+if __name__ == '__main__':
+    main()