w32: Expect gpgme-w32spawn.exe only in the gpgme installation dir.

* src/w32-util.c (find_program_at_standard_place): Remove.
(_gpgme_get_gpg_path): Make the search order more explicit.
(_gpgme_get_gpgconf_path): Ditto.
(_gpgme_get_w32spawn_path): Search only in the inst_dir.
--

This tries to avoid possible unclear bug reports by removing the
fallback to the current gpg4win installation directory for the gpgme
helper.  It is expected that users of gpgme installing their own gpgme
version also install the matching helper.

Signed-off-by: Werner Koch <wk@gnupg.org>

src/w32-util.c

@@ -397,40 +397,6 @@ find_program_in_dir (const char *dir, const char *name)
 }
 
 
-static char *
-find_program_in_inst_dir (const char *inst_dir, const char *name)
-{
-  char *result;
-  char *dir;
-
-  /* If an installation directory has been passed, this overrides a
-     location given by the registry.  The idea here is that we prefer
-     a program installed alongside with gpgme.  We don't want the
-     registry to override this to have a better isolation of an gpgme
-     aware applications for other effects.  Note that the "Install
-     Directory" registry item has been used for ages in Gpg4win and
-     earlier GnuPG windows installers.  It is technically not anymore
-     required.  */
-  if (inst_dir)
-    {
-      result = find_program_in_dir (inst_dir, name);
-      if (result)
-        return result;
-    }
-
-  dir = read_w32_registry_string ("HKEY_LOCAL_MACHINE",
-				  "Software\\GNU\\GnuPG",
-				  "Install Directory");
-  if (dir)
-    {
-      result = find_program_in_dir (dir, name);
-      free (dir);
-      return result;
-    }
-  return NULL;
-}
-
-
 static char *
 find_program_at_standard_place (const char *name)
 {
@@ -491,29 +457,50 @@ _gpgme_set_default_gpgconf_name (const char *name)
 
 
 /* Return the full file name of the GPG binary.  This function is used
-   if gpgconf was not found and thus it can be assumed that gpg2 is
+   iff gpgconf was not found and thus it can be assumed that gpg2 is
    not installed.  This function is only called by get_gpgconf_item
    and may not be called concurrently. */
 char *
 _gpgme_get_gpg_path (void)
 {
-  char *gpg;
+  char *gpg = NULL;
-  const char *inst_dir, *name;
+  const char *name, *inst_dir;
 
+  name = default_gpg_name? get_basename (default_gpg_name) : "gpg.exe";
+
+  /* 1. Try to find gpg.exe in the installation directory of gpgme.  */
   inst_dir = _gpgme_get_inst_dir ();
-  gpg = find_program_in_inst_dir
+  if (inst_dir)
-    (inst_dir,
+    {
-     default_gpg_name? get_basename (default_gpg_name) : "gpg.exe");
+      gpg = find_program_in_dir (inst_dir, name);
+    }
+
+  /* 2. Try to find gpg.exe using that ancient registry key.  */
   if (!gpg)
     {
-      name = (default_gpg_name? default_gpg_name
+      char *dir;
-              /* */           : "GNU\\GnuPG\\gpg.exe");
+
-      gpg = find_program_at_standard_place (name);
+      dir = read_w32_registry_string ("HKEY_LOCAL_MACHINE",
-      if (!gpg)
+                                      "Software\\GNU\\GnuPG",
-        _gpgme_debug (DEBUG_ENGINE, "_gpgme_get_gpg_path: '%s' not found",
+                                      "Install Directory");
-                      name);
+      if (dir)
+        {
+          gpg = find_program_in_dir (dir, name);
+          free (dir);
+        }
     }
 
+  /* 3. Try to find gpg.exe below CSIDL_PROGRAM_FILES.  */
+  if (!gpg)
+    {
+      name = default_gpg_name? default_gpg_name : "GNU\\GnuPG\\gpg.exe";
+      gpg = find_program_at_standard_place (name);
+    }
+
+  /* 4. Print a debug message if not found.  */
+  if (!gpg)
+    _gpgme_debug (DEBUG_ENGINE, "_gpgme_get_gpg_path: '%s' not found", name);
+
   return gpg;
 }
 
@@ -523,22 +510,45 @@ _gpgme_get_gpg_path (void)
 char *
 _gpgme_get_gpgconf_path (void)
 {
-  char *gpgconf;
+  char *gpgconf = NULL;
   const char *inst_dir, *name;
 
+  name = default_gpgconf_name? get_basename(default_gpgconf_name):"gpgconf.exe";
+
+  /* 1. Try to find gpgconf.exe in the installation directory of gpgme.  */
   inst_dir = _gpgme_get_inst_dir ();
-  gpgconf = find_program_in_inst_dir
+  if (inst_dir)
-    (inst_dir,
+    {
-     default_gpgconf_name? get_basename (default_gpgconf_name) : "gpgconf.exe");
+      gpgconf = find_program_in_dir (inst_dir, name);
+    }
+
+  /* 2. Try to find gpgconf.exe using that ancient registry key.  */
   if (!gpgconf)
     {
-      name = (default_gpgconf_name? default_gpgconf_name
+      char *dir;
-              /* */               : "GNU\\GnuPG\\gpgconf.exe");
+
-      gpgconf = find_program_at_standard_place (name);
+      dir = read_w32_registry_string ("HKEY_LOCAL_MACHINE",
-      if (!gpgconf)
+                                      "Software\\GNU\\GnuPG",
-        _gpgme_debug (DEBUG_ENGINE, "_gpgme_get_gpgconf_path: '%s' not found",
+                                      "Install Directory");
-                      name);
+      if (dir)
+        {
+          gpgconf = find_program_in_dir (dir, name);
+          free (dir);
+        }
     }
+
+  /* 3. Try to find gpgconf.exe below CSIDL_PROGRAM_FILES.  */
+  if (!gpgconf)
+    {
+      name = (default_gpgconf_name ? default_gpgconf_name
+              /**/                 : "GNU\\GnuPG\\gpgconf.exe");
+      gpgconf = find_program_at_standard_place (name);
+    }
+
+  /* 4. Print a debug message if not found.  */
+  if (!gpgconf)
+    _gpgme_debug (DEBUG_ENGINE, "_gpgme_get_gpgconf_path: '%s' not found",name);
+
   return gpgconf;
 }
 
@@ -552,10 +562,7 @@ _gpgme_get_w32spawn_path (void)
   inst_dir = _gpgme_get_inst_dir ();
   LOCK (get_path_lock);
   if (!w32spawn_program)
-    w32spawn_program = find_program_in_inst_dir (inst_dir,"gpgme-w32spawn.exe");
+    w32spawn_program = find_program_in_dir (inst_dir, "gpgme-w32spawn.exe");
-  if (!w32spawn_program)
-    w32spawn_program
-      = find_program_at_standard_place ("GNU\\GnuPG\\gpgme-w32spawn.exe");
   UNLOCK (get_path_lock);
   return w32spawn_program;
 }