Try to install PostgreSQL extensions automatically

CHANGELOG.md

@@ -9,7 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 - Add standard info elem fields for NVTs in get_info [#1426](https://github.com/greenbone/gvmd/pull/1426)
 - Add --ldap-debug option [#1439](https://github.com/greenbone/gvmd/pull/1439)
-- Add check if PostgreSQL extensions are installed [#1444](https://github.com/greenbone/gvmd/pull/1444)
+- Try to install PostgreSQL extensions automatically [#1444](https://github.com/greenbone/gvmd/pull/1444) [#1483](https://github.com/greenbone/gvmd/pull/1483)
 - Add auto retry on scanner connection lost during a running task [#1452](https://github.com/greenbone/gvmd/pull/1452)
 
 ### Changed

INSTALL.md

@@ -145,22 +145,13 @@ Certificates`.
     grant dba to mattm;    # mattm is the user created in step 3
     ```
 
-5.  Create DB extensions (also necessary when the database got dropped).
-
-    ```sh
-    sudo -u postgres bash  # if you logged out after step 4
-    psql gvmd
-    create extension "uuid-ossp";
-    create extension "pgcrypto";
-    ```
-
-6.  Make Postgres aware of the gvm libraries if not installed
+5.  Make Postgres aware of the gvm libraries if not installed
     in a ld-aware directory. For example create file `/etc/ld.so.conf.d/gvm.conf`
     with appropriate path and then run `ldconfig`.
 
-7.  Run Manager as usual.
+6.  Run Manager as usual.
 
-8. To run SQL on the database.
+7. To run SQL on the database.
 
     ```sh
     psql gvmd

src/manage_pg.c

@@ -38,6 +38,16 @@
  */
 #define G_LOG_DOMAIN "md manage"
 
+/**
+ * @brief Database superuser role
+ */
+#define DB_SUPERUSER_ROLE "dba"
+
+
+/* Headers */
+int
+check_db_extensions ();
+
 
 /* Session. */
 
@@ -187,17 +197,12 @@ manage_create_sql_functions ()
   if (created)
     return 0;
 
-  if (sql_int ("SELECT count (*) FROM pg_available_extensions"
-               " WHERE name = 'uuid-ossp' AND installed_version IS NOT NULL;")
-      == 0)
-    {
-      g_warning ("%s: PostgreSQL extension uuid-ossp required", __func__);
-      return -1;
-    }
+  if (check_db_extensions ())
+    return -1;
 
   /* Functions in C. */
 
-  sql ("SET role dba;");
+  sql ("SET ROLE \"%s\";", DB_SUPERUSER_ROLE);
 
   sql ("CREATE OR REPLACE FUNCTION hosts_contains (text, text)"
        " RETURNS boolean"
@@ -3037,47 +3042,56 @@ check_db_sequences ()
 }
 
 /**
- * @brief Check if an extension is installed.
+ * @brief Check if an extension is available and can be installed.
  * 
- * @param[in]  extname  Name of the extension to check.
+ * @param[in]  name  Name of the extension to check.
  *
- * @return TRUE extension is installed, FALSE otherwise.
+ * @return TRUE extension is available, FALSE otherwise.
  */
 static gboolean
-db_extension_installed (const char *extname)
+db_extension_available (const char *name)
 {
-  if (sql_int ("SELECT count(*) FROM pg_extension WHERE extname = '%s'",
-               extname))
+  if (sql_int ("SELECT count(*) FROM pg_available_extensions"
+               " WHERE name = '%s'",
+               name))
     {
-      g_debug ("%s: Extension '%s' is installed.",
-                 __func__, extname);
+      g_debug ("%s: Extension '%s' is available.",
+                 __func__, name);
       return TRUE;
     }
   else
     {
-      g_message ("%s: Extension '%s' is not installed.",
-                 __func__, extname);
+      g_message ("%s: Extension '%s' is not available.",
+                 __func__, name);
       return FALSE;
     }
 }
 
 /**
- * @brief Check if all extensions are installed.
+ * @brief Ensure all extensions are installed.
  *
  * @return 0 success, 1 extension missing.
  */
 int
 check_db_extensions ()
 {
-  if (db_extension_installed ("uuid-ossp")
-      && db_extension_installed ("pgcrypto"))
+  if (db_extension_available ("uuid-ossp")
+      && db_extension_available ("pgcrypto"))
     {
-      g_debug ("%s: All required extensions are installed.", __func__);
+      g_debug ("%s: All required extensions are available.", __func__);
+
+      // Switch to superuser role and try to install extensions.
+      sql ("SET ROLE \"%s\";", DB_SUPERUSER_ROLE);
+
+      sql ("CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\"");
+      sql ("CREATE EXTENSION IF NOT EXISTS \"pgcrypto\"");
+
+      sql ("RESET ROLE;");
       return 0;
     }
   else
     {
-      g_warning ("%s: A required extension is not installed.", __func__);
+      g_warning ("%s: A required extension is not available.", __func__);
       return 1;
     }
 }