[Qa-jenkins-scm] [jenkins.debian.net] 06/06: reproducible Debian: add script to create database from backup

[Holger Levsen]

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holger pushed a commit to branch master
in repository jenkins.debian.net.

commit 20a610115aa44862b92f08ecba49bb04b4c05daf
Author: Valerie R Young <spectranaut at riseup.net>
Date:   Sat Nov 26 14:25:36 2016 -0500

    reproducible Debian: add script to create database from backup
    
    Signed-off-by: Holger Levsen <holger at layer-acht.org>
---
 bin/reproducible_restore_db.py | 78 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/bin/reproducible_restore_db.py b/bin/reproducible_restore_db.py
new file mode 100755
index 0000000..d3b2626
--- /dev/null
+++ b/bin/reproducible_restore_db.py
@@ -0,0 +1,78 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+#
+# Copyright © 2016 Valerie Young <spectranaut at riseup.net>
+# Licensed under GPL-2
+#
+# Depends: python3, postgres, reproducible_common
+
+import subprocess
+import sys
+import os
+import argparse
+
+parser = argparse.ArgumentParser(
+    description='Create new Postgres database (reproducibledb) from backup.',
+    epilog='This script creates a database and populates it with the result'
+           ' of a "pg_dump". It will not run if the database already exists.'
+           ' Database name and database user are defined in'
+           ' reproducible_common.py .')
+parser.add_argument("-f", "--backup-file", required=True,
+                    help='result of a "pg_dump"')
+args, unknown_args = parser.parse_known_args()
+BACKUP_FILE = args.backup_file
+if not os.access(BACKUP_FILE, os.R_OK):
+    log.error("Backup file does not exist.")
+    sys.exit(1)
+
+# We skip the database connection because the database
+# may not exist yet, but we would like to use the constants
+# available in reproducible_common.py
+sys.argv.append('--skip-database-connection')
+from reproducible_common import *
+
+# Get database defined in reproducible_common.py
+# Note: this script will ONLY run on a completely new DB. The backup
+# file will be used to re-creates the schema and populate tables. If
+# run on a database with existing information, it will error.
+DB_NAME = PGDATABASE
+DB_USER = 'jenkins';
+
+try:
+    # check is the user exists, if not created it
+    log.info("Checking if postgres role exists...")
+    query = "SELECT 1 FROM pg_roles WHERE rolname='%s';" % DB_USER
+    command = ['sudo', '-u', 'postgres', 'psql', '-tAc', query]
+    result = subprocess.check_output(command).decode("utf-8").strip()
+
+    if result == '1':
+        log.info("user exists.")
+    else:
+        log.info("Postgres role %s does not exist. Creating role."
+                 % DB_USER)
+        check_call(['sudo', '-u', 'postgres', 'createuser', '-w', DB_USER])
+
+    # check is the database exists
+    log.info("Checking if postgres database exists...")
+    query = "SELECT 1 FROM pg_database WHERE datname='%s'" % DB_NAME
+    command = ['sudo', '-u', 'postgres', 'psql', '-tAc', query]
+    result = subprocess.check_output(command).decode("utf-8").strip()
+
+    if result == '1':
+        print_critical_message('Database "%s" already exists. This script can'
+            ' only be run on a completely new database. If you are certain you'
+            ' want to clone "%s" in "%s", please drop the database "%s" and'
+            ' run this script again.' % (DB_NAME, BACKUP_FILE, DB_NAME, DB_NAME))
+        sys.exit(1)
+    else:
+        log.info("Postgres database %s does not exist. Creating database."
+                 % DB_NAME)
+        check_call(['sudo', '-u', 'postgres', 'createdb', '-O', DB_USER,
+                    '-w', DB_NAME])
+
+except FileNotFoundError:
+    print_critical_message("Postgres is not installed. Install postgres before continuing.")
+    sys.exit(1)
+
+log.info("Copying backup to new database...")
+check_call(['psql', '-U', DB_USER, '-d', DB_NAME, '-f', BACKUP_FILE])

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