Package: trac / 1.2.3+dfsg-1

0002-Add-script-to-migrate-from-SQlite-to-PostgreSQL.patch Patch series | download
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From dd73a84c41230a4b8957a3a0c76066f2076de1a4 Mon Sep 17 00:00:00 2001
From: "debacle@debian.org" <debacle@debian.org>
Date: Fri, 11 Dec 2015 00:27:00 +0100
Subject: Add script to migrate from SQlite to PostgreSQL.

---
 contrib/sqlitetopgscript/sqlite2pg | 336 +++++++++++++++++++++++++++++++++++++
 1 file changed, 336 insertions(+)
 create mode 100644 contrib/sqlitetopgscript/sqlite2pg

--- /dev/null
+++ b/contrib/sqlitetopgscript/sqlite2pg
@@ -0,0 +1,336 @@
+#!/usr/bin/env python
+
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2008 John Hampton <pacopablo@pacopablo.com>
+# All rights reserved.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://trac.edgewall.com/license.html.
+#
+# This software consists of voluntary contributions made by many
+# individuals. For the exact contribution history, see the revision
+# history and logs, available at:
+# http://trac-hacks.org/wiki/SqliteToPgScript
+#
+# Basically, it boils down to: feel free to use/modify/distribute/etc.
+# However, give me credit where due.  Also, if you like the script and
+# find it useful, buy me a soda or candy bar or something if ever we
+# meet. Thanks and enjoy.
+#
+# Author: John Hampton <pacopablo@pacopablo.com>
+
+
+import os, os.path, sys
+from trac.env import Environment, EnvironmentSetup, IEnvironmentSetupParticipant
+from trac.core import ComponentMeta
+from trac.db import DatabaseManager
+from optparse import OptionParser
+from psycopg2 import ProgrammingError, IntegrityError
+from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
+
+VERSION='0.10'
+
+class TableMigration(object):
+    """
+        Class to conatin all table migration functions
+    """
+    def __init__(self, sqlenv, pgenv, opts):
+        """ Create a TableMigration instance.  Required are SQLite and
+            PostgreSQL environment objects
+        """
+        self.sqlenv = sqlenv
+        self.pgenv = pgenv
+        self.opts = opts
+        self.sdb = self.sqlenv.get_db_cnx()
+        self.pgdb = self.pgenv.get_db_cnx()
+        self.pgdb_schema = self.pgdb.schema
+        pass
+
+    def lookupMethod(self, table):
+        """ Get a reference to the function that handles migration for the
+            specified table
+        """
+        m = getattr(self, ''.join(['migrate_', table.upper()]), None)
+        if not m:
+            m = self.default_copy
+        return m
+
+    def cleanTable(self, table):
+        """ Clear the contents of the table """
+        cur = self.pgdb.cursor()
+        delete_from = "DELETE FROM %s" % table
+        cur.execute(delete_from)
+
+    def migrateTable(self, table):
+        """ Migrate the table specified. """
+        if not self.opts.noclean:
+            self.cleanTable(table)
+        m = getattr(self, ''.join(['migrate_', table.upper()]), None)
+        if not m:
+            rc = self.default_copy(table)
+        else:
+            rc = m()
+        return rc
+
+    def default_copy(self, table):
+        """ Copy the table from the sqlite db to the postgresql db """
+        select_all = "SELECT * FROM %s" % table
+        scur = self.sdb.cursor()
+        pgcur = self.pgdb.cursor()
+        scur.execute(select_all)
+        cols = scur.description
+        if not cols:
+            return True
+        subs = ["%s" for x in range(len(cols))]
+        insert_into = ''.join([ "INSERT INTO ", table, " VALUES (",
+                                ','.join(subs), ")"])
+        rows = row_exists = 0
+        for row in scur:
+            rows += 1
+            try:
+                pgcur.execute(insert_into, row)
+            except (ProgrammingError, IntegrityError):
+                row_exists += 1
+            continue
+        if row_exists:
+            print "%s of %s rows already existed in the %s table" % \
+                  (str(row_exists), str(rows), table)
+        self.pgdb.commit()
+        return row_exists > 0
+
+    def migrate_TICKET(self):
+        """ Migrate the ticket table and adjust the sequences properly """
+        self.default_copy('ticket')
+        select_maxticket = "SELECT max(id) FROM ticket"
+        pgcur = self.pgdb.cursor()
+        pgcur.execute(select_maxticket)
+        r = pgcur.fetchone()
+        if r:
+            pgcur.execute("SELECT setval('ticket_id_seq', %s)", r)
+        self.pgdb.commit()
+
+    def migrate_REPORT(self):
+        """ Migrate the report table and adjust the sequences properly """
+        self.default_copy('report')
+        select_maxreport = "SELECT max(id) FROM report"
+        pgcur = self.pgdb.cursor()
+        pgcur.execute(select_maxreport)
+        r = pgcur.fetchone()
+        if r:
+            pgcur.execute("SELECT setval('report_id_seq', %s)", r)
+        self.pgdb.commit()
+
+    def migrate_PERMISSION(self):
+        """
+            Migrate permission table
+        """
+        scur = self.sdb.cursor()
+        pgcur = self.pgdb.cursor()
+        rows = row_exists = 0
+        if not self.opts.plist:
+            sql_select = "SELECT * FROM permission"
+        else:
+            subs = []
+            for x in range(len(self.opts.plist)):
+                subs.append("%s")
+                continue
+            sql_select = ''.join([  "SELECT * FROM permission ",
+                                    "WHERE username NOT IN (",
+                                    ','.join(subs),
+                                    ")",
+                                 ])
+
+        scur.execute(sql_select, self.opts.plist)
+        sql_insert = "INSERT INTO permission VALUES (%s, %s)"
+        for row in scur:
+            rows += 1
+            try:
+                pgcur.execute(sql_insert, row)
+            except (ProgrammingError, IntegrityError):
+                row_exists += 1
+            continue
+        if row_exists:
+            print "%s of %s rows already existed in the permission table" % (str(row_exists), str(rows))
+        self.pgdb.commit()
+        return row_exists > 0
+
+    def migrate_WIKI(self):
+        """
+            Migrate wiki table
+        """
+        scur = self.sdb.cursor()
+        pgcur = self.pgdb.cursor()
+        rows = row_exists = 0
+        if not self.opts.wlist:
+            sql_select = "SELECT * FROM wiki"
+        else:
+            subs = []
+            for x in range(len(self.opts.wlist)):
+                subs.append("%s")
+                continue
+            sql_select = ''.join([  "SELECT * FROM wiki ",
+                                    "WHERE name NOT IN (",
+                                    ','.join(subs),
+                                    ")",
+                                 ])
+
+        scur.execute(sql_select, self.opts.wlist)
+        sql_insert = "INSERT INTO wiki VALUES (%s, %s, %s, %s, %s, %s, %s, %s)"
+        for row in scur:
+            rows += 1
+            try:
+                pgcur.execute(sql_insert, row)
+            except (ProgrammingError, IntegrityError):
+                row_exists += 1
+            continue
+        if row_exists:
+            print "%s of %s rows already existed in the wiki table" % (str(row_exists), str(rows))
+        self.pgdb.commit()
+        return row_exists > 0
+
+
+def getSQLiteEnvironment(opts):
+    """ Create an Environment connected to the SQLite database """
+
+    dburi = opts.sqlite_uri
+    env = Environment(opts.tracenv)
+    env.config.set('trac', 'database', dburi)
+    return env
+
+def getPostgreSQLEnvironment(opts):
+    """ Create an Environment connected to the PostgreSQL database """
+
+    dburi = opts.pg_uri
+    env = Environment(opts.tracenv)
+    env.config.set('trac', 'database', dburi)
+    try:
+        cnx = env.get_db_cnx()
+        cur = cnx.cursor()
+        cur.execute("select value from system where name = 'database_version'");
+    except ProgrammingError:
+        cnx.rollback()
+        DatabaseManager(env).init_db()
+        DatabaseManager(env).shutdown()
+        for x in filter(None, [env.compmgr[cls] for cls in
+                        ComponentMeta._registry.get(
+                        IEnvironmentSetupParticipant, [])]):
+            if isinstance(x, EnvironmentSetup):
+                x.environment_created()
+    if env.needs_upgrade():
+        env.upgrade()
+    return env
+
+def getAllTables(env):
+    """ Queries the PostgreSQL database for a list of tables """
+    cnx = env.get_db_cnx()
+    schema = cnx.schema or u'public'
+    cur = cnx.cursor()
+    select_tables = """SELECT tablename
+                         FROM pg_catalog.pg_tables
+                        WHERE schemaname = %s"""
+    cur.execute(select_tables, (schema,))
+    cnx.commit()
+    return [table[0] for table in cur]
+
+def Main(opts):
+    """
+        Migrate data from SQLite to PostgreSQL
+    """
+    rc = 0
+
+    sqlenv = getSQLiteEnvironment(opts)
+    pgenv = getPostgreSQLEnvironment(opts)
+    tmigration = TableMigration(sqlenv, pgenv, opts)
+    if not opts.tlist:
+        opts.tlist = getAllTables(pgenv)
+    for tname in opts.tlist:
+        try:
+            rc = tmigration.migrateTable(tname) or rc
+        except AttributeError:
+            print "Migration of %s has not been implemented" % tname
+            pass
+        continue
+
+    return rc
+
+def doArgs(argv):
+    """ Look if you can't guess what this function does, just give up now. """
+    global VERSION
+
+    version = "%%prog %s" % VERSION
+    usage ="usage: %prog [options] [site]"
+    description="%prog is used to migrate data from SQLite to PostgreSQL."
+
+    parser = OptionParser(usage=usage, version=version, description=description)
+
+    parser.add_option("-t", "--tracbase", dest="tracbase", type="string",
+                        help="Parent path for trac sites",
+                        metavar="<path>")
+    parser.add_option("-e", "--tracenv", dest="tracenv", type="string",
+                        help="Path to trac environment",
+                        metavar="<path>")
+    parser.add_option("-m", "--migrate", dest="migrate", type="string",
+                        help="Comma separated list of tables to migrate",
+                        metavar="<list>", default=None)
+    parser.add_option("", "--exclude_perms", dest="perms_exclude",
+                        type="string", help="Comma separated list of users to "
+                        "exclude from permission migration", metavar="<list>")
+    parser.add_option("-w", "--wikipages", dest="wikipages", type="string",
+                        help="Comma separated list of wiki page names to "
+                        "ommit from the migration", metavar="<list>")
+    parser.add_option("-p", "--pg_uri", dest="pg_uri", type="string",
+                        help="DB URI for PostgreSQL database",
+                        metavar="<uri>")
+    parser.add_option("-s", "--sqlite_uri", dest="sqlite_uri", type="string",
+                        help="DB URI for SQLite database",
+                        metavar="<uri>", default="sqlite:db/trac.db")
+    parser.add_option("", "--noclean", dest="noclean", action="store_true",
+                        help="Do not clear PostgreSQL tables before transfer",
+                        default=False)
+
+    (options, args) = parser.parse_args(argv)
+    if not options.tracenv:
+        if  not options.tracbase:
+            print ("You must specify the --tracenv or the --tracbase option")
+            sys.exit(1)
+        else:
+            if len(args) < 1:
+                print ("You must specify a project name\n")
+                sys.exit(1)
+            options.project = args[0]
+            options.tracenv = os.path.join(options.tracbase, args[0])
+
+    if not options.pg_uri or not options.pg_uri.startswith('postgres://'):
+        print ("You must specify a valid URI for the PostgreSQL database.")
+        print ("  eg. postgres://user:password@localhost/dbname")
+        sys.exit(1)
+
+    if not options.sqlite_uri or not options.sqlite_uri.startswith('sqlite:'):
+        print ("You must specify a valid URI for the SQLite database.")
+        print ("  eg. sqlite:db/trac.db")
+        sys.exit(1)
+
+
+    options.args = args
+    options.tlist = options.migrate and \
+                    [t.strip() for t in options.migrate.strip().split(',')]
+    options.wlist = options.wikipages and \
+                    [w.strip() for w in options.wikipages.strip().split(',')] \
+                    or []
+    options.plist = options.perms_exclude and \
+                    [p.strip() for p in options.perms_exclude.strip().split(',')] \
+                    or []
+
+    return options
+
+
+def main(argv):
+    opts = doArgs(argv)
+    Main(opts)
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))
+