Initial replication setup.

This add replication setup through two new commands: ipa-replica-prepare
and ipa-replica-install. The procedure is to run ipa-replica-prepare
on an existing master. This will collect information about the realm
and the current master and create a file storing all of the information.
After copying that file to the new replica, ipa-replica-install is
run (with -r to create a read-only replica).

This version of the patch also includes fixes for the sasl mappings
on the replicas.

Remaining features:
- ssl for replication.
- automatic configuration of mesh topology for
  master (or a simpler way to replicate multiple
  masters.
- tool for view / configuring current replication.

ipa-server/ipaserver/installutils.py

@@ -0,0 +1,108 @@
+# Authors: Simo Sorce <ssorce@redhat.com>
+#
+# Copyright (C) 2007    Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2 or later
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.    See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+
+import logging
+import socket
+import errno
+import getpass
+
+def get_fqdn():
+    fqdn = ""
+    try:
+        fqdn = socket.getfqdn()
+    except:
+        try:
+            fqdn = socket.gethostname()
+        except:
+            fqdn = ""
+    return fqdn
+   
+def verify_fqdn(host_name):
+    if len(host_name.split(".")) < 2 or host_name == "localhost.localdomain":
+        raise RuntimeError("Invalid hostname: " + host_name)
+
+def port_available(port):
+    """Try to bind to a port on the wildcard host
+       Return 1 if the port is available
+       Return 0 if the port is in use
+    """
+    rv = 1
+
+    try:
+        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        s.bind(('', port))
+        s.shutdown(0)
+        s.close()
+    except socket.error, e:
+        if e[0] == errno.EADDRINUSE:
+            rv = 0
+
+    if rv:
+        try:
+            s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            s.bind(('', port))
+            s.shutdown(0)
+            s.close()
+        except socket.error, e:
+            if e[0] == errno.EADDRINUSE:
+                rv = 0
+
+    return rv
+
+def standard_logging_setup(log_filename, debug=False):
+    # Always log everything (i.e., DEBUG) to the log
+    # file.
+    logging.basicConfig(level=logging.DEBUG,
+                        format='%(asctime)s %(levelname)s %(message)s',
+                        filename=log_filename,
+                        filemode='w')
+
+    console = logging.StreamHandler()
+    # If the debug option is set, also log debug messages to the console
+    if debug:
+        console.setLevel(logging.DEBUG)
+    else:
+        # Otherwise, log critical and error messages
+        console.setLevel(logging.ERROR)
+    formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
+    console.setFormatter(formatter)
+    logging.getLogger('').addHandler(console)
+
+def read_password(user):
+    correct = False
+    pwd = ""
+    while not correct:
+        pwd = getpass.getpass(user + " password: ")
+        if not pwd:
+            continue
+        if len(pwd) < 8:
+            print "Password must be at least 8 characters long"
+            continue
+        pwd_confirm = getpass.getpass("Password (confirm): ")
+        if pwd != pwd_confirm:
+            print "Password mismatch!"
+            print ""
+        else:
+            correct = True
+    print ""
+    return pwd
+
+