Patch from James Radley to allow override of the dotfile location.

Read environment variable GNC_DOT_DIR and, if available, use this
instead of `g_get_home_dir`/.gnucash.  This allows one develop without
impacting an existing stable installation, excepting shared GConf
keys.  Setting HOME does not help, because g_get_home_dir prefers
passwd entries.


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@15746 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/gnc-filepath-utils.c

@@ -382,14 +382,17 @@ gnc_dotgnucash_dir (void)
   if (dotgnucash)
     return dotgnucash;
 
-  home = g_get_home_dir();
-  if (!home) {
-    g_warning("Cannot find home directory. Using tmp directory instead.");
-    home = g_get_tmp_dir();
-  }
-  g_assert(home);
+  dotgnucash = g_strdup(g_getenv("GNC_DOT_DIR"));
+  if (!dotgnucash) {
+    home = g_get_home_dir();
+    if (!home) {
+      g_warning("Cannot find home directory. Using tmp directory instead.");
+      home = g_get_tmp_dir();
+    }
+    g_assert(home);
 
-  dotgnucash = g_build_filename(home, ".gnucash", (gchar *)NULL);
+    dotgnucash = g_build_filename(home, ".gnucash", (gchar *)NULL);
+  }
   gnc_validate_directory(dotgnucash);
 
   /* Since we're in code that is only executed once.... */