diff --git a/core/Makefile b/core/Makefile
index 2f20817..a97d8bf 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -995,9 +995,9 @@
 	$(hide) mkdir -p $(zip_root)/META
 	$(hide) $(ACP) $(APKCERTS_FILE) $(zip_root)/META/apkcerts.txt
 	$(hide)	echo "$(PRODUCT_OTA_PUBLIC_KEYS)" > $(zip_root)/META/otakeys.txt
-	$(hide) echo "$(PRIVATE_RECOVERY_API_VERSION)" > $(zip_root)/META/recovery-api-version.txt
+	$(hide) echo "recovery_api_version=$(PRIVATE_RECOVERY_API_VERSION)" > $(zip_root)/META/misc_info.txt
 ifdef BOARD_FLASH_BLOCK_SIZE
-	$(hide) echo "blocksize=$(BOARD_FLASH_BLOCK_SIZE)" > $(zip_root)/META/misc_info.txt
+	$(hide) echo "blocksize=$(BOARD_FLASH_BLOCK_SIZE)" >> $(zip_root)/META/misc_info.txt
 endif
 ifdef BOARD_BOOTIMAGE_PARTITION_SIZE
 	$(hide) echo "boot_size=$(BOARD_BOOTIMAGE_PARTITION_SIZE)" >> $(zip_root)/META/misc_info.txt
@@ -1020,9 +1020,9 @@
 	$(hide) echo "fs_type=yaffs2" >> $(zip_root)/META/misc_info.txt
 	$(hide) echo "partition_type=MTD" >> $(zip_root)/META/misc_info.txt
 endif
-	$(hide) echo "$(tool_extensions)" > $(zip_root)/META/tool-extensions.txt
+	$(hide) echo "tool_extensions=$(tool_extensions)" >> $(zip_root)/META/misc_info.txt
 ifdef mkyaffs2_extra_flags
-	$(hide) echo "$(mkyaffs2_extra_flags)" > $(zip_root)/META/mkyaffs2-extra-flags.txt
+	$(hide) echo "mkyaffs2_extra_flags=$(mkyaffs2_extra_flags)" >> $(zip_root)/META/misc_info.txt
 endif
 	@# Zip everything up, preserving symlinks
 	$(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 44291d0..3ec4c2d 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -40,7 +40,6 @@
 OPTIONS.tempfiles = []
 OPTIONS.device_specific = None
 OPTIONS.extras = {}
-OPTIONS.mkyaffs2_extra_flags = None
 OPTIONS.info_dict = None
 
 
@@ -59,68 +58,78 @@
   return subprocess.Popen(args, **kwargs)
 
 
-def LoadInfoDict():
+def LoadInfoDict(zip):
   """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")):
+    for line in zip.read("META/misc_info.txt").split("\n"):
       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
+  except KeyError:
+    # ok if misc_info.txt doesn't exist
+    pass
 
-  if "fs_type" not in d: info["fs_type"] = "yaffs2"
-  if "partition_type" not in d: info["partition_type"] = "MTD"
+  if "fs_type" not in d: d["fs_type"] = "yaffs2"
+  if "partition_type" not in d: d["partition_type"] = "MTD"
+
+  # backwards compatibility: These values used to be in their own
+  # files.  Look for them, in case we're processing an old
+  # target_files zip.
+
+  if "mkyaffs2_extra_flags" not in d:
+    try:
+      d["mkyaffs2_extra_flags"] = zip.read("META/mkyaffs2-extra-flags.txt").strip()
+    except KeyError:
+      # ok if flags don't exist
+      pass
+
+  if "recovery_api_version" not in d:
+    try:
+      d["recovery_api_version"] = zip.read("META/recovery-api-version.txt").strip()
+    except KeyError:
+      raise ValueError("can't find recovery API version in input target-files")
+
+  if "tool_extensions" not in d:
+    try:
+      d["tool_extensions"] = zip.read("META/tool-extensions.txt").strip()
+    except KeyError:
+      # ok if extensions don't exist
+      pass
+
+  try:
+    data = zip.read("META/imagesizes.txt")
+    for line in data.split("\n"):
+      if not line: continue
+      name, value = line.strip().split(None, 1)
+      if name == "blocksize":
+        d[name] = value
+      else:
+        d[name + "_size"] = value
+  except KeyError:
+    pass
+
+  def makeint(key):
+    if key in d:
+      d[key] = int(d[key], 0)
+
+  makeint("recovery_api_version")
+  makeint("blocksize")
+  makeint("system_size")
+  makeint("userdata_size")
+  makeint("recovery_size")
+  makeint("boot_size")
 
   return d
 
+def DumpInfoDict(d):
+  for k, v in sorted(d.items()):
+    print "%-25s = (%s) %s" % (k, type(v).__name__, v)
 
-def LoadMaxSizes(info):
-  """Load the maximum allowable images sizes from the input
-  target_files.  Uses the imagesizes.txt file if it's available
-  (pre-gingerbread 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")):
-      pieces = line.split()
-      if len(pieces) != 2: continue
-      image = pieces[0]
-      size = int(pieces[1], 0)
-      OPTIONS.max_image_size[image + ".img"] = size
-  except IOError, e:
-    if e.errno == errno.ENOENT:
-      def copy(x, y):
-        if x+y in info: OPTIONS.max_image_size[x+".img"] = int(info[x+y], 0)
-      copy("blocksize", "")
-      copy("boot", "_size")
-      copy("recovery", "_size")
-      copy("system", "_size")
-      copy("userdata", "_size")
-    else:
-      raise
-
-
-def LoadMkyaffs2ExtraFlags():
-  """Load mkyaffs2 extra flags."""
-  try:
-    fn = os.path.join(OPTIONS.input_tmp, "META", "mkyaffs2-extra-flags.txt");
-    if os.access(fn, os.F_OK):
-      OPTIONS.mkyaffs2_extra_flags = open(fn).read().rstrip("\n")
-  except IOError, e:
-    if e.errno == errno.ENOENT:
-      pass
-
-
-def BuildAndAddBootableImage(sourcedir, targetname, output_zip):
+def BuildAndAddBootableImage(sourcedir, targetname, output_zip, info_dict):
   """Take a kernel, cmdline, and ramdisk directory from the input (in
   'sourcedir'), and turn them into a boot image.  Put the boot image
   into the output zip file under the name 'targetname'.  Returns
@@ -133,7 +142,7 @@
   if img is None:
     return None
 
-  CheckSize(img, targetname)
+  CheckSize(img, targetname, info_dict)
   ZipWriteStr(output_zip, targetname, img)
   return targetname
 
@@ -194,13 +203,13 @@
   return data
 
 
-def AddRecovery(output_zip):
+def AddRecovery(output_zip, info_dict):
   BuildAndAddBootableImage(os.path.join(OPTIONS.input_tmp, "RECOVERY"),
-                           "recovery.img", output_zip)
+                           "recovery.img", output_zip, info_dict)
 
-def AddBoot(output_zip):
+def AddBoot(output_zip, info_dict):
   BuildAndAddBootableImage(os.path.join(OPTIONS.input_tmp, "BOOT"),
-                           "boot.img", output_zip)
+                           "boot.img", output_zip, info_dict)
 
 def UnzipTemp(filename, pattern=None):
   """Unzip the given archive into a temporary directory and return the name."""
@@ -294,12 +303,12 @@
     temp.close()
 
 
-def CheckSize(data, target):
+def CheckSize(data, target, info_dict):
   """Check the data string passed against the max size limit, if
   any, for the given target.  Raise exception if the data is too big.
   Print a warning if the data is nearing the maximum size."""
 
-  fs_type = OPTIONS.info_dict.get("fs_type", None)
+  fs_type = info_dict.get("fs_type", None)
   if not fs_type: return
 
   limit = OPTIONS.max_image_size.get(target, None)
diff --git a/tools/releasetools/edify_generator.py b/tools/releasetools/edify_generator.py
index 3334b43..390bd4b 100644
--- a/tools/releasetools/edify_generator.py
+++ b/tools/releasetools/edify_generator.py
@@ -31,7 +31,7 @@
     """Make a temporary script object whose commands can latter be
     appended to the parent script with AppendScript().  Used when the
     caller wants to generate script commands out-of-order."""
-    x = EdifyGenerator(self.version)
+    x = EdifyGenerator(self.version, self.info)
     x.mounts = self.mounts
     return x
 
diff --git a/tools/releasetools/img_from_target_files b/tools/releasetools/img_from_target_files
index a74ef89..8250b0e 100755
--- a/tools/releasetools/img_from_target_files
+++ b/tools/releasetools/img_from_target_files
@@ -68,8 +68,9 @@
       build_command.append(str(OPTIONS.max_image_size["userdata.img"]))
   else:
     build_command = ["mkyaffs2image", "-f"]
-    if OPTIONS.mkyaffs2_extra_flags is not None:
-      build_command.append(OPTIONS.mkyaffs2_extra_flags);
+    extra = OPTIONS.info_dict.get("mkyaffs2_extra_flags", None)
+    if extra:
+      build_command.extend(extra.split())
     build_command.append(user_dir)
     build_command.append(img.name)
 
@@ -77,7 +78,7 @@
   p.communicate()
   assert p.returncode == 0, "build userdata.img image failed"
 
-  common.CheckSize(img.name, "userdata.img")
+  common.CheckSize(img.name, "userdata.img", OPTIONS.info_dict)
   output_zip.write(img.name, "userdata.img")
   img.close()
   os.rmdir(user_dir)
@@ -115,8 +116,9 @@
       build_command.append(str(OPTIONS.max_image_size["system.img"]))
   else:
     build_command = ["mkyaffs2image", "-f"]
-    if OPTIONS.mkyaffs2_extra_flags is not None:
-      build_command.extend(OPTIONS.mkyaffs2_extra_flags.split());
+    extra = OPTIONS.info_dict.get("mkyaffs2_extra_flags", None)
+    if extra:
+      build_command.extend(extra.split())
     build_command.append(os.path.join(OPTIONS.input_tmp, "system"))
     build_command.append(img.name)
 
@@ -128,7 +130,7 @@
   data = img.read()
   img.close()
 
-  common.CheckSize(data, "system.img")
+  common.CheckSize(data, "system.img", OPTIONS.info_dict)
   common.ZipWriteStr(output_zip, "system.img", data)
 
 
@@ -158,20 +160,13 @@
 
   OPTIONS.input_tmp = common.UnzipTemp(args[0])
 
-  OPTIONS.info_dict = common.LoadInfoDict()
-  common.LoadMaxSizes(OPTIONS.info_dict)
-  if not OPTIONS.max_image_size:
-    print
-    print "  WARNING:  Failed to load max image sizes; will not enforce"
-    print "  image size limits."
-    print
-
-  common.LoadMkyaffs2ExtraFlags()
+  input_zip = zipfile.ZipFile(args[0], "r")
+  OPTIONS.info_dict = common.LoadInfoDict(input_zip)
 
   output_zip = zipfile.ZipFile(args[1], "w", compression=zipfile.ZIP_DEFLATED)
 
-  common.AddBoot(output_zip)
-  common.AddRecovery(output_zip)
+  common.AddBoot(output_zip, OPTIONS.info_dict)
+  common.AddRecovery(output_zip, OPTIONS.info_dict)
   AddSystem(output_zip)
   AddUserdata(output_zip)
   CopyInfo(output_zip)
diff --git a/tools/releasetools/ota_from_target_files b/tools/releasetools/ota_from_target_files
index 89caa5c..37715bc 100755
--- a/tools/releasetools/ota_from_target_files
+++ b/tools/releasetools/ota_from_target_files
@@ -347,7 +347,7 @@
 
   device_specific = common.DeviceSpecificParams(
       input_zip=input_zip,
-      input_version=GetRecoveryAPIVersion(input_zip),
+      input_version=OPTIONS.info_dict["recovery_api_version"],
       output_zip=output_zip,
       script=script,
       input_tmp=OPTIONS.input_tmp,
@@ -382,7 +382,7 @@
   Item.GetMetadata(input_zip)
   Item.Get("system").SetPermissions(script)
 
-  common.CheckSize(boot_img.data, "boot.img")
+  common.CheckSize(boot_img.data, "boot.img", OPTIONS.info_dict)
   common.ZipWriteStr(output_zip, "boot.img", boot_img.data)
   script.ShowProgress(0.2, 0)
 
@@ -432,25 +432,9 @@
   return m.group(1).strip()
 
 
-def GetRecoveryAPIVersion(zip):
-  """Returns the version of the recovery API.  Version 0 is the older
-  amend code (no separate binary)."""
-  try:
-    version = zip.read("META/recovery-api-version.txt")
-    return int(version)
-  except KeyError:
-    try:
-      # version one didn't have the recovery-api-version.txt file, but
-      # it did include an updater binary.
-      zip.getinfo("OTA/bin/updater")
-      return 1
-    except KeyError:
-      return 0
-
-
 def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
-  source_version = GetRecoveryAPIVersion(source_zip)
-  target_version = GetRecoveryAPIVersion(target_zip)
+  source_version = OPTIONS.source_info_dict["recovery_api_version"]
+  target_version = OPTIONS.target_info_dict["recovery_api_version"]
 
   if source_version == 0:
     print ("WARNING: generating edify script for a source that "
@@ -738,33 +722,19 @@
   print "unzipping target target-files..."
   OPTIONS.input_tmp = common.UnzipTemp(args[0])
 
-  if OPTIONS.device_specific is None:
-    # look for the device-specific tools extension location in the input
-    try:
-      f = open(os.path.join(OPTIONS.input_tmp, "META", "tool-extensions.txt"))
-      ds = f.read().strip()
-      f.close()
-      if ds:
-        ds = os.path.normpath(ds)
-        print "using device-specific extensions in", ds
-        OPTIONS.device_specific = ds
-    except IOError, e:
-      if e.errno == errno.ENOENT:
-        # nothing specified in the file
-        pass
-      else:
-        raise
-
-  OPTIONS.info_dict = common.LoadInfoDict()
-  common.LoadMaxSizes(OPTIONS.info_dict)
-  if not OPTIONS.max_image_size:
-    print
-    print "  WARNING:  Failed to load max image sizes; will not enforce"
-    print "  image size limits."
-    print
-
   OPTIONS.target_tmp = OPTIONS.input_tmp
   input_zip = zipfile.ZipFile(args[0], "r")
+  OPTIONS.info_dict = common.LoadInfoDict(input_zip)
+  if OPTIONS.verbose:
+    print "--- target info ---"
+    common.DumpInfoDict(OPTIONS.info_dict)
+
+  if OPTIONS.device_specific is None:
+    OPTIONS.device_specific = OPTIONS.info_dict.get("tool_extensions", None)
+  if OPTIONS.device_specific is not None:
+    OPTIONS.device_specific = os.path.normpath(OPTIONS.device_specific)
+    print "using device-specific extensions in", OPTIONS.device_specific
+
   if OPTIONS.package_key:
     temp_zip_file = tempfile.NamedTemporaryFile()
     output_zip = zipfile.ZipFile(temp_zip_file, "w",
@@ -779,6 +749,11 @@
     print "unzipping source target-files..."
     OPTIONS.source_tmp = common.UnzipTemp(OPTIONS.incremental_source)
     source_zip = zipfile.ZipFile(OPTIONS.incremental_source, "r")
+    OPTIONS.target_info_dict = OPTIONS.info_dict
+    OPTIONS.source_info_dict = common.LoadInfoDict(source_zip)
+    if OPTIONS.verbose:
+      print "--- source info ---"
+      common.DumpInfoDict(OPTIONS.source_info_dict)
     WriteIncrementalOTAPackage(input_zip, source_zip, output_zip)
 
   output_zip.close()