Stop ns builds polluting the environment with EMACSDATA, EMACSDOC

It's bad form for one part of a program to communicate with another
part by making persistent changes to the environment of all subsequent
child processes.  For example, it can cause odd bugs when building
Emacs from within Emacs (eg bug#6401, maybe).

* nsterm.m (ns_etc_directory): New function, split from ns_init_paths.
(ns_init_paths): Do not set EMACSDATA, EMACSDOC.
* nsterm.h (ns_etc_directory): Add it.
* callproc.c [HAVE_NS]: Include nsterm.h.
(init_callproc_1, init_callproc) [HAVE_NS]: Use ns_etc_directory.

4 files changed, 60 insertions, 14 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 1375bbe78d9..1aa5f7df5c3 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,12 @@
+2012-07-09  Glenn Morris  <rgm@gnu.org>
+
+        Stop ns builds polluting the environment with EMACSDATA, EMACSDOC.
+        * nsterm.m (ns_etc_directory): New function, split from ns_init_paths.
+        (ns_init_paths): Do not set EMACSDATA, EMACSDOC.
+        * nsterm.h (ns_etc_directory): Add it.
+        * callproc.c [HAVE_NS]: Include nsterm.h.
+        (init_callproc_1, init_callproc) [HAVE_NS]: Use ns_etc_directory.
+
 2012-07-09  Dmitry Antipov  <dmantipov@yandex.ru>
 
         Move marker debugging code under MARKER_DEBUG.
diff --git a/src/callproc.c b/src/callproc.c
index 39fcb99c4b5..52825bc9dc2 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -61,6 +61,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "msdos.h"
 #endif
 
+#ifdef HAVE_NS
+#include "nsterm.h"
+#endif
+
 #ifndef USE_CRT_DLL
 extern char **environ;
 #endif
@@ -1513,13 +1517,26 @@ init_callproc_1 (void)
 {
   char *data_dir = egetenv ("EMACSDATA");
   char *doc_dir = egetenv ("EMACSDOC");
+#ifdef HAVE_NS
+  const char *etc_dir = ns_etc_directory ();
+#endif
 
   Vdata_directory
     = Ffile_name_as_directory (build_string (data_dir ? data_dir
-                                             : PATH_DATA));
+#ifdef HAVE_NS
+                                             : (etc_dir ? etc_dir : PATH_DATA)
+#else
+                                             : PATH_DATA
+#endif
+                                             ));
   Vdoc_directory
     = Ffile_name_as_directory (build_string (doc_dir ? doc_dir
-                                             : PATH_DOC));
+#ifdef HAVE_NS
+                                             : (etc_dir ? etc_dir : PATH_DOC)
+#else
+                                             : PATH_DOC
+#endif
+                                             ));
 
   /* Check the EMACSPATH environment variable, defaulting to the
      PATH_EXEC path from epaths.h.  */
@@ -1537,6 +1554,17 @@ init_callproc (void)
 
   register char * sh;
   Lisp_Object tempdir;
+#ifdef HAVE_NS
+  if (data_dir == 0)
+    {
+      const char *etc_dir = ns_etc_directory ();
+      if (etc_dir)
+        {
+          data_dir = alloca (strlen (etc_dir) + 1);
+          strcpy (data_dir, etc_dir);
+        }
+    }
+#endif
 
   if (!NILP (Vinstallation_directory))
     {
diff --git a/src/nsterm.h b/src/nsterm.h
index 80d25d67941..b2f03d08f2c 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -798,6 +798,7 @@ extern void x_free_frame_resources (struct frame *);
 #define NSAPP_DATA2_RUNASSCRIPT 10
 extern void ns_run_ascript (void);
 
+extern char *ns_etc_directory (void);
 extern void ns_init_paths (void);
 extern void syms_of_nsterm (void);
 extern void syms_of_nsfns (void);
diff --git a/src/nsterm.m b/src/nsterm.m
index 1cd4c1c4271..4c4d3de78ff 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -286,6 +286,26 @@ append2 (Lisp_Object list, Lisp_Object item)
 }
 
 
+char *
+ns_etc_directory (void)
+{
+/* If running as a self-contained app bundle, return as a string the
+   filename of the etc directory, if present; else nil.  */
+
+     NSBundle *bundle = [NSBundle mainBundle];
+     NSString *resourceDir = [bundle resourcePath];
+     NSString *resourcePath;
+     NSFileManager *fileManager = [NSFileManager defaultManager];
+     BOOL isDir;
+
+     resourcePath = [resourceDir stringByAppendingPathComponent: @"etc"];
+     if ([fileManager fileExistsAtPath: resourcePath isDirectory: &isDir])
+     {
+          if (isDir) return [resourcePath UTF8String];
+     }
+     return nil;
+}
+
 void
 ns_init_paths (void)
 /* --------------------------------------------------------------------------
@@ -369,18 +389,6 @@ ns_init_paths (void)
       if ([resourcePaths length] > 0)
         setenv ("EMACSPATH", [resourcePaths UTF8String], 1);
     }
-
-  resourcePath = [resourceDir stringByAppendingPathComponent: @"etc"];
-  if ([fileManager fileExistsAtPath: resourcePath isDirectory: &isDir])
-    {
-      if (isDir)
-        {
-          if (!getenv ("EMACSDATA"))
-            setenv ("EMACSDATA", [resourcePath UTF8String], 1);
-          if (!getenv ("EMACSDOC"))
-            setenv ("EMACSDOC", [resourcePath UTF8String], 1);
-        }
-    }
 }
 
 static void