support for ext4/EMMC in target_files and OTA generation

Move the image sizes into a more generic key-value file.  Make them
optional.  Add additional key/value pairs describing what kind of
filesystem the device uses.  Pass new fs-type-related arguments in
edify scripts when mounting and reformatting partitions.

Don't include all the init.*.rc files from the regular system in
recovery -- they aren't needed, and break recovery on some devices.

Change-Id: Ic1c651f754ed00ba1cffe8cf56c43f7f3b0ebfd7

tools/releasetools/common.py

@@ -58,9 +58,35 @@ def Run(args, **kwargs):
   return subprocess.Popen(args, **kwargs)
 
 
-def LoadMaxSizes():
+def LoadInfoDict():
+  """Read and parse the META/misc_info.txt key/value pairs from the
+  input target files and return a dict."""
+
+  d = {}
+  try:
+    for line in open(os.path.join(OPTIONS.input_tmp, "META", "misc_info.txt")):
+      line = line.strip()
+      if not line or line.startswith("#"): continue
+      k, v = line.split("=", 1)
+      d[k] = v
+  except IOError, e:
+    if e.errno == errno.ENOENT:
+      # ok if misc_info.txt file doesn't exist
+      pass
+    else:
+      raise
+
+  if "fs_type" not in d: info["fs_type"] = "yaffs2"
+  if "partition_type" not in d: info["partition_type"] = "MTD"
+
+  return d
+
+
+def LoadMaxSizes(info):
   """Load the maximum allowable images sizes from the input
-  target_files size."""
+  target_files.  Uses the imagesizes.txt file if it's available
+  (pre-honeycomb target_files), or the more general info dict (which
+  must be passed in) if not."""
   OPTIONS.max_image_size = {}
   try:
     for line in open(os.path.join(OPTIONS.input_tmp, "META", "imagesizes.txt")):
@@ -71,7 +97,15 @@ def LoadMaxSizes():
       OPTIONS.max_image_size[image + ".img"] = size
   except IOError, e:
     if e.errno == errno.ENOENT:
-      pass
+      def copy(x, y):
+        if x in info: OPTIONS.max_image_size[x+".img"] = int(info[x+y])
+      copy("blocksize", "")
+      copy("boot", "_size")
+      copy("recovery", "_size")
+      copy("system", "_size")
+      copy("userdata", "_size")
+    else:
+      raise
 
 
 def LoadMkyaffs2ExtraFlags():