add misc/build_helpers/test-with-fake-pkg.py. refs #1190

misc/build_helpers/test-with-fake-pkg.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+# We put a fake "pycryptopp-0.5.17" package on the PYTHONPATH so that
+# the build system thinks pycryptopp-0.5.17 is already installed. Then
+# we execute run_trial.py. If the build system is too naive/greedy
+# about finding dependencies, it will latch onto the
+# "pycryptopp-0.5.17" and then will be unable to satisfy the
+# requirement (from _auto_deps.py) for pycryptopp >= 0.5.20. This is
+# currently happening on trunk, see #1190. So with trunk, running
+# test-with-fake-pkg.py shows a failure, but with the ticket1190
+# branch, test-with-fake-pkg.py succeeds.
+
+import glob, os, subprocess, sys
+
+fakepkgname = "pycryptopp"
+fakepkgversion = "0.5.17"
+# testsuite = "allmydata.test.test_cli"
+testsuite = "allmydata.test.test_base62"
+
+pkgdirname = os.path.join(os.getcwd(), '%s-%s.egg' % (fakepkgname, fakepkgversion))
+
+try:
+    os.makedirs(pkgdirname)
+except OSError:
+    # probably already exists
+    pass
+os.chdir('src')
+trial=os.path.join(os.getcwd(), '..', 'misc', 'build_helpers', 'run_trial.py')
+os.environ['PATH']=os.getcwd()+os.pathsep+os.environ['PATH']
+os.environ['PYTHONPATH']=os.pathsep+pkgdirname+os.pathsep+os.pathsep.join(glob.glob('*.egg'))+os.pathsep+os.environ.get('PYTHONPATH','')
+sys.exit(subprocess.call([sys.executable, trial, testsuite], env=os.environ))