[Bug 8188] New: Mechanism for taking an rsync server down for maintenance

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=8188

           Summary: Mechanism for taking an rsync server down for
                    maintenance
           Product: rsync
           Version: 3.0.8
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: andrew-samba-bugzilla at andrew.net.au
         QAContact: rsync-qa at samba.org


Hi,

I run a mirror, which provides content over rsync, amongst other protocols.

I'm looking for a nicer way to take the rsync component down when I need to
make the mirror unavailable for maintenance. Currently for Apache, I can put up
a server that returns a 503 HTTP response, for FTP, I can use ProFTPd's ftpshut
command, which puts a file in place that makes ProFTPd return 500 responses for
new connections.

To the best of my reading of the rsync source (start_daemon in clientserver.c),
there doesn't seem to be any such functionality for rsync. I currently have to
simply stop the rsync daemon, which doesn't convey a useful message to the
user.

I was thinking if for every new connection, the rsync daemon checked for the
existence of a file in /etc (perhaps /etc/rsync.shutdown?) and if this was
present, displayed the contents of the file to the remote user and closed the
connection.

>From my limited understanding of rsync, I presume this would require extending
the protocol to allow for sending such a message back to the remote client.

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