Added script for correctly restoring the database from a dump recreating the generated columns

README.md

@@ -5,3 +5,15 @@
 This repository defines the VOSpace database structure.
 
 It consists in a PostgreSQL database with the [ltree](https://www.postgresql.org/docs/12/ltree.html) extension. SQL files are named starting with a number because they are put in a Docker image where they have to be executed in order.
+
+## Dump and restore
+
+To restore the file catalog from a dump it is necessary to drop the generated columns and regenerate them after the import. This can be done using the restore_db.sh script located in the dump_and_restore folder of this repository.
+
+To obtain a data only dump of the database use the following command:
+
+    pg_dump -h <hostname> -U postgres --data-only --format=tar vospace_testdb > mydump.tar
+
+Then you can use the restore script in the following way:
+
+    ./restore_db.sh -U postgres -h 127.0.0.1 -p 5432 -d vospace_testdb mydump.tar
\ No newline at end of file

dump_and_restore/path-indexes.sql

+ALTER TABLE node ADD COLUMN path ltree GENERATED ALWAYS AS (path(parent_path, node_id)) STORED;
+CREATE INDEX file_path_gist_idx ON node USING GIST(path);
+CREATE UNIQUE INDEX file_path_idx ON node USING btree(path);
+
+ALTER TABLE node ADD COLUMN relative_path ltree GENERATED ALWAYS AS (path(parent_relative_path, node_id)) STORED;
+CREATE INDEX file_rel_path_gist_idx ON node USING GIST(relative_path);

dump_and_restore/pre-restore.sql

+DELETE FROM node;
+ALTER SEQUENCE node_node_id_seq RESTART WITH 1;
+
+-- Generated columns need to be dropped and generated again. This causes also path support views to be dropped
+ALTER TABLE node DROP COLUMN path CASCADE;
+ALTER TABLE node DROP COLUMN relative_path CASCADE;

dump_and_restore/restore_db.sh

+#!/bin/bash
+
+user="postgres"
+host="localhost"
+port="5432"
+database="postgres"
+
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        -U) user="$2"; shift ;;
+        -h) host="$2"; shift ;;
+        -p) port="$2"; shift ;;
+        -d) database="$2"; shift ;;
+        *) dump_file="$1" ;;
+    esac
+    shift
+done
+
+if [ -z "$dump_file" ]; then
+    echo "Specify dump file as last argument"
+    exit 1
+fi
+
+psql -U $user -h $host -p $port $database < pre-restore.sql
+pg_restore -U $user -h $host -p $port -d $database $dump_file
+psql -U $user -h $host -p $port $database < path-indexes.sql
+psql -U $user -h $host -p $port $database < ../02-views.sql