Agptek Rocker: Add tools to work with OF update images

Original firmware update is provided as .upt file. This file
is actually ISO9660 image containing uBoot, kernel image and
UBIFS rootfs and additional control files. Installing
bootloader means patching UBIFS rootfs image.

Change-Id: Ica86d1189dc1d5f3131d2035d8b87c8d08ec36b5

tools/agptek_rocker/update_update.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+import os
+import sys
+import hashlib
+import argparse
+from collections import OrderedDict
+
+EQ = '='
+BLK_START = '{'
+BLK_END = '}'
+
+#name: {key: value, key: value}
+def parse(filename):
+    blocks = OrderedDict()
+    blk = None
+    key = None
+    value = None
+
+    with open(filename) as f:
+        # read all lines
+        for line in f:
+            # if line has '=' sign treat it
+            # as split symbol
+            if EQ in line:
+                key, value = line.split(EQ, 1)
+                key = key.strip()
+                value = value.strip()
+
+                if value == BLK_START:
+                    # value on the right of '=' is '{'
+                    # so this opens new block
+                    blk = key
+                    blocks[key] = OrderedDict()
+
+                elif value == BLK_END:
+                    # value on the right of '=' is '}'
+                    # this terminates block
+                    blk = None
+
+                else:
+                    # key = value inside block
+                    blocks[blk][key] = value
+
+    # return parsed structure as dictionary
+    return blocks
+
+# write back internal representation into file
+def dump(tree, filename=None):
+    with open(filename, 'w') as f:
+        for blk in tree.keys():
+            f.write('\n%s={\n' % blk)
+            for key,value in tree[blk].items():
+                f.write('\t%s=%s\n' % (key,value))
+            f.write('}\n')
+
+if __name__=='__main__':
+    description = 'Update information in update.txt control file.'
+    usage = 'update_update.py filepath'
+
+    argp = argparse.ArgumentParser(usage=usage, description=description)
+    argp.add_argument('filepath', help='update.txt filepath to update contents of.')
+
+    if len(sys.argv) == 1:
+        argp.print_help()
+        sys.exit(1)
+
+    args = argp.parse_args()
+
+    # build config file representation
+    tree = parse(args.filepath)
+
+    dir = os.path.dirname(args.filepath)
+
+    # update all md5 sums
+    for blk in tree.keys():
+        filename = os.path.join(dir, os.path.basename(tree[blk]['file_path']))
+        with open(filename) as f:
+            tree[blk]['md5'] = hashlib.md5(f.read()).hexdigest()
+
+    # write back result
+    dump(tree, args.filepath)