_PG_init()

void _PG_init

(

void

)

Definition at line 421 of file rtpostgis.c.

               {
 
        bool boot_postgis_enable_outdb_rasters = false;
        MemoryContext old_context;
 
        /*
         * Change to context for memory allocation calls like palloc() in the
         * extension initialization routine
         */
        old_context = MemoryContextSwitchTo(TopMemoryContext);
 
        /*
         use POSTGIS_GDAL_ENABLED_DRIVERS to set the bootValue
         of GUC postgis.gdal_enabled_drivers
        */
        env_postgis_gdal_enabled_drivers = getenv("POSTGIS_GDAL_ENABLED_DRIVERS");
        if (env_postgis_gdal_enabled_drivers == NULL) {
                boot_postgis_gdal_enabled_drivers = palloc(
                        sizeof(char) * (strlen(GDAL_DISABLE_ALL) + 1)
                );
                sprintf(boot_postgis_gdal_enabled_drivers, "%s", GDAL_DISABLE_ALL);
        }
        else {
                boot_postgis_gdal_enabled_drivers = rtpg_trim(
                        env_postgis_gdal_enabled_drivers
                );
        }
        POSTGIS_RT_DEBUGF(
                4,
                "boot_postgis_gdal_enabled_drivers = %s",
                boot_postgis_gdal_enabled_drivers
        );
 
        /*
         use POSTGIS_ENABLE_OUTDB_RASTERS to set the bootValue
         of GUC postgis.enable_outdb_rasters
        */
        env_postgis_enable_outdb_rasters = getenv("POSTGIS_ENABLE_OUTDB_RASTERS");
        if (env_postgis_enable_outdb_rasters != NULL) {
                char *env = rtpg_trim(env_postgis_enable_outdb_rasters);
 
                /* out of memory */
                if (env == NULL) {
                        elog(ERROR, "_PG_init: Cannot process environmental variable: POSTGIS_ENABLE_OUTDB_RASTERS");
                        return;
                }
 
                if (strcmp(env, "1") == 0)
                        boot_postgis_enable_outdb_rasters = true;
 
                if (env != env_postgis_enable_outdb_rasters)
                        pfree(env);
        }
        POSTGIS_RT_DEBUGF(
                4,
                "boot_postgis_enable_outdb_rasters = %s",
                boot_postgis_enable_outdb_rasters ? "TRUE" : "FALSE"
        );
 
        /* Install liblwgeom handlers */
        pg_install_lwgeom_handlers();
 
        /* Install rtcore handlers */
        rt_set_handlers(rt_pg_alloc, rt_pg_realloc, rt_pg_free, rt_pg_error, rt_pg_debug, rt_pg_notice);
 
        /* Define custom GUC variables. */
        if ( postgis_guc_find_option("postgis.gdal_datapath") )
        {
                /* In this narrow case the previously installed GUC is tied to the callback in */
                /* the previously loaded library. Probably this is happening during an */
                /* upgrade, so the old library is where the callback ties to. */
                elog(WARNING, "'%s' is already set and cannot be changed until you reconnect", "postgis.gdal_datapath");
        }
        else
        {
                DefineCustomStringVariable(
                        "postgis.gdal_datapath", /* name */
                        "Path to GDAL data files.", /* short_desc */
                        "Physical path to directory containing GDAL data files (sets the GDAL_DATA config option).", /* long_desc */
                        &gdal_datapath, /* valueAddr */
                        NULL, /* bootValue */
                        PGC_SUSET, /* GucContext context */
                        0, /* int flags */
                        NULL, /* GucStringCheckHook check_hook */
                        rtpg_assignHookGDALDataPath, /* GucStringAssignHook assign_hook */
                        NULL  /* GucShowHook show_hook */
                );
        }
 
        if ( postgis_guc_find_option("postgis.gdal_enabled_drivers") )
        {
                /* In this narrow case the previously installed GUC is tied to the callback in */
                /* the previously loaded library. Probably this is happening during an */
                /* upgrade, so the old library is where the callback ties to. */
                elog(WARNING, "'%s' is already set and cannot be changed until you reconnect", "postgis.gdal_enabled_drivers");
        }
        else
        {
                DefineCustomStringVariable(
                        "postgis.gdal_enabled_drivers", /* name */
                        "Enabled GDAL drivers.", /* short_desc */
                        "List of enabled GDAL drivers by short name. To enable/disable all drivers, use 'ENABLE_ALL' or 'DISABLE_ALL' (sets the GDAL_SKIP config option).", /* long_desc */
                        &gdal_enabled_drivers, /* valueAddr */
                        boot_postgis_gdal_enabled_drivers, /* bootValue */
                        PGC_SUSET, /* GucContext context */
                        0, /* int flags */
                        NULL, /* GucStringCheckHook check_hook */
                        rtpg_assignHookGDALEnabledDrivers, /* GucStringAssignHook assign_hook */
                        NULL  /* GucShowHook show_hook */
                );
        }
 
        if ( postgis_guc_find_option("postgis.enable_outdb_rasters") )
        {
                /* In this narrow case the previously installed GUC is tied to the callback in */
                /* the previously loaded library. Probably this is happening during an */
                /* upgrade, so the old library is where the callback ties to. */
                elog(WARNING, "'%s' is already set and cannot be changed until you reconnect", "postgis.enable_outdb_rasters");
        }
        else
        {
                DefineCustomBoolVariable(
                        "postgis.enable_outdb_rasters", /* name */
                        "Enable Out-DB raster bands", /* short_desc */
                        "If true, rasters can access data located outside the database", /* long_desc */
                        &enable_outdb_rasters, /* valueAddr */
                        boot_postgis_enable_outdb_rasters, /* bootValue */
                        PGC_SUSET, /* GucContext context */
                        0, /* int flags */
                        NULL, /* GucStringCheckHook check_hook */
                        rtpg_assignHookEnableOutDBRasters, /* GucBoolAssignHook assign_hook */
                        NULL  /* GucShowHook show_hook */
                );
        }
 
        /* Revert back to old context */
        MemoryContextSwitchTo(old_context);
}

References boot_postgis_gdal_enabled_drivers, enable_outdb_rasters, env_postgis_enable_outdb_rasters, env_postgis_gdal_enabled_drivers, gdal_datapath, GDAL_DISABLE_ALL, gdal_enabled_drivers, POSTGIS_RT_DEBUGF, rt_pg_alloc(), rt_pg_debug(), rt_pg_error(), rt_pg_free(), rt_pg_notice(), rt_pg_realloc(), rt_set_handlers(), rtpg_assignHookEnableOutDBRasters(), rtpg_assignHookGDALDataPath(), rtpg_assignHookGDALEnabledDrivers(), and rtpg_trim().

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