#249: add 'test-desert-island', to assert that a tahoe-deps.tar.gz -enabled build does not download anything

Makefile

@@ -245,6 +245,18 @@ clean:
 find-trailing-spaces:
 	$(PYTHON) misc/find-trailing-spaces.py -r src
 
+# The test-desert-island target grabs the tahoe-deps tarball, unpacks it,
+# does a build, then asserts that the build did not try to download anything
+# as it ran. Invoke this on a new tree, or after a 'clean', to make sure the
+# support/lib/ directory is gone.
+
+test-desert-island:
+	wget http://allmydata.org/source/tahoe/tarballs/tahoe-deps.tar.gz
+	tar xf tahoe-deps.tar.gz
+	$(MAKE) 2>&1 | tee make.out
+	$(PYTHON) misc/check-build.py make.out no-downloads
+
+
 # TARBALL GENERATION
 .PHONY: tarballs upload-tarballs
 tarballs:

misc/check-build.py

@@ -0,0 +1,22 @@
+#! /usr/bin/env python
+
+# This helper script is used with the 'test-desert-island' Makefile target.
+
+import sys
+
+good = True
+build_out = sys.argv[1]
+mode = sys.argv[2]
+
+for line in open(build_out, "r"):
+    if mode == "no-downloads" and "downloading" in line.lower():
+        print line,
+        good = False
+if good:
+    if mode == "no-downloads":
+        print "Good: build did not try to download any files"
+    sys.exit(0)
+else:
+    if mode == "no-downloads":
+        print "Failed: build tried to download files"
+    sys.exit(1)