Allow default binary paths to be set in the config for each database driver.

web/config.py

@@ -263,6 +263,21 @@ STORAGE_DIR = os.path.join(
     'storage'
 )
 
+##########################################################################
+# Default locations for binary utilities (pg_dump, pg_restore etc)
+#
+# These are intentionally left empty in the main config file, but are
+# expected to be overridden by packagers in config_distro.py.
+#
+# A default location can be specified for each database driver ID, in
+# a dictionary. A relative (to the working directory for the package)
+# location may be specified, or absolute.
+##########################################################################
+DEFAULT_BINARY_PATHS = {
+    "pg":   "",
+    "ppas": ""
+}
+
 ##########################################################################
 # Test settings - used primarily by the regression suite, not for users
 ##########################################################################

web/pgadmin/browser/server_groups/servers/types.py

@@ -13,6 +13,7 @@ from flask import render_template
 from flask_babel import gettext as _
 from pgadmin.utils.preferences import Preferences
 
+import config
 
 class ServerType(object):
     """
@@ -48,11 +49,12 @@ class ServerType(object):
 
         for key in cls.registry:
             st = cls.registry[key]
+            default_path = config.DEFAULT_BINARY_PATHS[st.stype] or ""
 
             st.utility_path = paths.register(
                 'bin_paths', st.stype + '_bin_dir',
                 _("{0} Binary Path").format(st.desc),
-                'text', "", category_label=_('Binary paths'),
+                'text', default_path, category_label=_('Binary paths'),
                 help_str=_(
                     "Path to the directory containing the {0} utility programs (pg_dump, pg_restore etc).".format(
                         st.desc