krb5 commit: Document kpropd -t and fix it in iprop mode

[Greg Hudson]

https://github.com/krb5/krb5/commit/334f761ba485e4af6d5fb8822e276d4590b97bf5
commit 334f761ba485e4af6d5fb8822e276d4590b97bf5
Author: Greg Hudson <ghudson at mit.edu>
Date:   Wed Apr 8 17:35:56 2015 -0400

    Document kpropd -t and fix it in iprop mode
    
    If kpropd is asked to run just once, don't exit after starting a full
    resync; we want to wait for the fullprop child to process the request,
    and then request incremental updates afterwards.  Also don't exit from
    do_standalone() in the fullprop child, in case multiple full resyncs
    are required to get the database up to date.
    
    Document the -t flag in kpropd.rst.
    
    ticket: 8161

 doc/admin/admin_commands/kpropd.rst |    7 +++++++
 src/slave/kpropd.c                  |    4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/doc/admin/admin_commands/kpropd.rst b/doc/admin/admin_commands/kpropd.rst
index 465d4f5..5e01e2f 100644
--- a/doc/admin/admin_commands/kpropd.rst
+++ b/doc/admin/admin_commands/kpropd.rst
@@ -15,6 +15,7 @@ SYNOPSIS
 [**-p** *kdb5_util_prog*]
 [**-P** *port*]
 [**-d**]
+[**-t**]
 
 DESCRIPTION
 -----------
@@ -89,6 +90,12 @@ OPTIONS
     it will run in the foreground and print out debugging messages
     during the database propagation.
 
+**-t**
+    In standalone mode without incremental propagation, exit after one
+    dump file is received.  In incremental propagation mode, exit as
+    soon as the database is up to date, or if the master returns an
+    error.
+
 **-P**
     Allow for an alternate port number for kpropd to listen on.  This
     is only useful in combination with the **-S** option.
diff --git a/src/slave/kpropd.c b/src/slave/kpropd.c
index 1bac58e..1383156 100644
--- a/src/slave/kpropd.c
+++ b/src/slave/kpropd.c
@@ -444,7 +444,7 @@ do_standalone()
              * process that it should poll for incremental updates. */
             if (fullprop_child == 0)
                 kill(getppid(), SIGUSR1);
-            if (runonce)
+            else if (runonce)
                 exit(0);
         }
     }
@@ -963,7 +963,7 @@ reinit:
             break;
         }
 
-        if (runonce == 1)
+        if (runonce == 1 && incr_ret->ret != UPDATE_FULL_RESYNC_NEEDED)
             goto done;
 
         /*