diff --git a/aos/vision/download/downloader.py b/aos/vision/download/downloader.py
new file mode 100644
index 0000000..3aea634
--- /dev/null
+++ b/aos/vision/download/downloader.py
@@ -0,0 +1,50 @@
+#!/usr/bin/python
+
+# This file is run by shell scripts generated by the aos_vision_downloader Skylark
+# macro. Everything before the first -- is a hard-coded list of files to
+# download.
+
+from __future__ import print_function
+
+import sys
+import subprocess
+import re
+import os
+import os.path
+
+def RunAndSplitShas(shcmd):
+  out = subprocess.check_output(shcmd)
+  return [line.split(' ')[0] for line in filter(lambda x: x, out.split('\n'))]
+
+def GetChecksums(fnames):
+  return RunAndSplitShas(["sha256sum"] + fnames)
+
+def GetJetsonChecksums(ssh_target, fnames):
+  target_files = ["/root/%s" % fname for fname in fnames]
+  subprocess.check_call(["ssh", ssh_target, "touch " + " ".join(target_files)])
+  cmds = ["ssh", ssh_target, "sha256sum " + " ".join(target_files)]
+  return RunAndSplitShas(cmds)
+
+def ToJetsonFname(fname):
+  if (fname[-9:] == ".stripped"):
+    fname = fname[:-9]
+  return os.path.basename(fname)
+
+def VerifyCheckSumsAndUpload(fnames, ssh_target):
+  jetson_fnames = [ToJetsonFname(fname) for fname in fnames]
+  checksums = GetChecksums(fnames)
+  jetson_checksums = GetJetsonChecksums(ssh_target, jetson_fnames)
+  for i in xrange(len(fnames)):
+    if (checksums[i] != jetson_checksums[i]):
+      # if empty, unlink
+      subprocess.check_call(["ssh", ssh_target, "unlink " + jetson_fnames[i]])
+      subprocess.check_call(["scp", fnames[i], ssh_target + ":" + jetson_fnames[i]])
+
+def main(argv):
+  args = argv[argv.index('--') + 1:]
+  files = argv[1:argv.index('--')]
+
+  VerifyCheckSumsAndUpload(files, args[-1])
+
+if __name__ == '__main__':
+  main(sys.argv)