diff --git a/build_manifest.py b/build_manifest.py
new file mode 100755
index 0000000..508555f
--- /dev/null
+++ b/build_manifest.py
@@ -0,0 +1,64 @@
+#!/usr/bin/python3
+
+import argparse
+import hashlib
+import json
+import os
+import re
+import sys
+import time
+
+
+parser = argparse.ArgumentParser(description='iconograph fetcher')
+parser.add_argument(
+    '--image-dir',
+    dest='image_dir',
+    action='store',
+    required=True)
+parser.add_argument(
+    '--image-type',
+    dest='image_type',
+    action='store',
+    required=True)
+FLAGS = parser.parse_args()
+
+
+class ManifestBuilder(object):
+
+  _FILE_REGEX = '^%(image_type)s\.(?P<timestamp>\d+)\.iso$'
+  _BUF_SIZE = 2 ** 16
+
+  def __init__(self, image_dir, image_type):
+    self._image_dir = image_dir
+    self._file_regex = re.compile(self._FILE_REGEX % {
+        'image_type': image_type,
+    })
+
+  def BuildManifest(self):
+    ret = {
+        'timestamp': int(time.time()),
+        'images': [],
+    }
+    for filename in os.listdir(self._image_dir):
+      match = self._file_regex.match(filename)
+      if not match:
+        continue
+      image = {
+          'timestamp': match.group('timestamp'),
+      }
+      with open(os.path.join(self._image_dir, filename), 'rb') as fh:
+        hash_obj = hashlib.sha256()
+        while True:
+          data = fh.read(self._BUF_SIZE)
+          if not data:
+            break
+          hash_obj.update(data)
+        image['hash'] = hash_obj.hexdigest()
+      ret['images'].append(image)
+    return ret
+
+
+builder = ManifestBuilder(FLAGS.image_dir, FLAGS.image_type)
+manifest = builder.BuildManifest()
+json.dump(manifest, sys.stdout, indent=4)
+sys.stdout.write('\n')