[lit] Fix internal shell's argv[0] handling.

- At least on OS X, it is important for correct behavior of /bin/[ that argv[0]
   is passed as written, and not as the full executable path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189559 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/TestRunner.py

@@ -131,8 +131,8 @@ def executeShCmd(cmd, cfg, cwd, results):
 
         # Resolve the executable path ourselves.
         args = list(j.args)
-        args[0] = lit.util.which(args[0], cfg.environment['PATH'])
-        if not args[0]:
+        executable = lit.util.which(args[0], cfg.environment['PATH'])
+        if not executable:
             raise InternalShellError(j, '%r: command not found' % j.args[0])
 
         # Replace uses of /dev/null with temporary files.
@@ -145,6 +145,7 @@ def executeShCmd(cmd, cfg, cwd, results):
                     args[i] = f.name
 
         procs.append(subprocess.Popen(args, cwd=cwd,
+                                      executable = executable,
                                       stdin = stdin,
                                       stdout = stdout,
                                       stderr = stderr,

utils/lit/tests/shtest-format.py

@@ -7,6 +7,7 @@
 
 # CHECK: -- Testing:
 
+# CHECK: PASS: shtest-format :: argv0.txt
 # CHECK: FAIL: shtest-format :: external_shell/fail.txt
 # CHECK-NEXT: *** TEST 'shtest-format :: external_shell/fail.txt' FAILED ***
 # CHECK: Command Output (stdout):
@@ -68,7 +69,7 @@
 # CHECK: shtest-format :: external_shell/fail_with_bad_encoding.txt
 # CHECK: shtest-format :: fail.txt
 
-# CHECK: Expected Passes    : 3
+# CHECK: Expected Passes    : 4
 # CHECK: Expected Failures  : 3
 # CHECK: Unsupported Tests  : 2
 # CHECK: Unresolved Tests   : 1