Add a gen_sym_files script for OSX

This attempts to replicate what i686-w64-mingw32-gen_sym_files
is doing for us with MinGW by parsing the output of otool -L
to get the library name actually used by the executable.

admin/osx/gen_sym_files.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+
+import logging, os, re, subprocess, sys
+import os.path
+import pdb, pprint
+
+if len(sys.argv) < 4:
+    print("Usage:")
+    print("\tgen_sym_files.py <path to breakpad's dump_syms> <path to owncloud.app> <symbol output dir>")
+    print("")
+    print("Symbols will be created in './symbols'")
+    sys.exit(1)
+
+dump_symsPath = sys.argv[1]
+bundlePath = sys.argv[2]
+outPath = sys.argv[3]
+macOsDir = os.path.join(bundlePath, 'Contents', 'MacOS')
+pluginsDir = os.path.join(bundlePath, 'Contents', 'PlugIns')
+
+def resolvePath(input):
+    resolved = re.sub(r'@\w+', macOsDir, input)
+    return os.path.normpath(resolved)
+
+def extractDeps(macho):
+    deps = [macho]
+    otool = subprocess.Popen(['otool', '-L', macho], stdout=subprocess.PIPE)
+    for l in otool.communicate()[0].splitlines():
+        m = re.search(r'@[^\s]+', l)
+        if m:
+            path = resolvePath(m.group(0))
+            if not os.path.exists(path):
+                logging.warning("Non-existant file found in dependencies, ignoring: [%s]", path)
+                continue
+            deps.append(path)
+    return deps
+
+def findDeps():
+    deps = []
+    for f in os.listdir(macOsDir):
+        path = os.path.join(macOsDir, f)
+        if not os.path.islink(path):
+            deps += extractDeps(path)
+    for root, dirs, files in os.walk(pluginsDir):
+        for f in files:
+            path = os.path.join(root, f)
+            deps += extractDeps(path)
+    return sorted(set(deps))
+
+def dumpSyms(deps):
+    for dep in deps:
+        print("Generating symbols for [%s]" % dep)
+        with open('temp.sym', 'w') as temp:
+            subprocess.check_call([dump_symsPath, dep], stdout=temp)
+        with open('temp.sym', 'r') as temp:
+            header = temp.readline()
+            fields = header.split()
+            key, name = fields[3:5]
+        destDir = '%s/%s/%s/' % (outPath, name, key)
+        destPath = destDir + name + '.sym'
+        if os.path.exists(destPath):
+            logging.warning("Symbols already exist: [%s]", destPath)
+            continue
+        if not os.path.exists(destDir):
+            os.makedirs(destDir)
+        os.rename('temp.sym', destPath)
+
+def strip(deps):
+    for dep in deps:
+        print("Stripping symbols off [%s]" % dep)
+        subprocess.check_call(['strip', '-S', dep])
+
+print('=== Generating symbols for [%s] in [%s]' % (bundlePath, outPath))
+deps = findDeps()
+dumpSyms(deps)
+strip(deps)