From 8443dc250bb58091c435db2b29e2029c434d1750 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Wed, 31 Jul 2013 18:37:33 +0100
Subject: Set SRCDIR and clean environment

---
 yarn                  | 28 +++++++++++++++++++++++++++-
 yarn.tests/env.script | 18 ++++++++++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100755 yarn.tests/env.script

diff --git a/yarn b/yarn
index 288e23b..6fbd63a 100755
--- a/yarn
+++ b/yarn
@@ -267,6 +267,31 @@ class YarnRunner(cliapp.Application):
 
         return ok
 
+    def clean_env(self):
+        '''Return a clean environment for running tests.'''
+
+        whitelisted = [
+            'TERM',
+            'USER',
+            'USERNAME',
+            'PATH',
+            'HOME',
+            'LOGNAME',
+        ]
+
+        hardcoded = {
+            'SHELL': '/bin/sh',
+            'LC_ALL': 'C',
+        }
+
+        env = {}
+        for key in whitelisted:
+            if key in os.environ:
+                env[key] = os.environ[key]
+        for key in hardcoded:
+            env[key] = hardcoded[key]
+        return env
+
     def run_step(self, datadir, scenario, step, shell_prelude, report_error):
         self.info('Running step "%s %s"' % (step.what, step.text))
         self.ts['step'] = step
@@ -274,8 +299,9 @@ class YarnRunner(cliapp.Application):
 
         m = re.match(step.implementation.regexp, step.text)
         assert m is not None
-        env = os.environ.copy()
+        env = self.clean_env()
         env['DATADIR'] = datadir
+        env['SRCDIR'] = os.getcwd()
         for i, match in enumerate(m.groups('')):
             env['MATCH_%d' % (i+1)] = match
 
diff --git a/yarn.tests/env.script b/yarn.tests/env.script
new file mode 100755
index 0000000..2ef35c6
--- /dev/null
+++ b/yarn.tests/env.script
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+set -eu
+
+cat << 'EOF' > "$DATADIR/env.yarn"
+    SCENARIO check environment
+    THEN DATADIR is set
+    AND SRCDIR is set
+    AND NOTSET is not set
+
+    IMPLEMENTS THEN (\S+) is set
+    env | grep "^$MATCH_1="
+
+    IMPLEMENTS THEN (\S+) is not set
+    ! env | grep "^$MATCH_1="
+EOF
+
+NOTSET=foo ./run-yarn "$DATADIR/env.yarn"
-- 
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