rsync - May 2006 - DO NOT REPLY [Bug 3787] New: Optional exit code indicating receiver was changed

https://bugzilla.samba.org/show_bug.cgi?id=3787

           Summary: Optional exit code indicating receiver was changed
           Product: rsync
           Version: 2.6.9
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: core
        AssignedTo: wayned@samba.org
        ReportedBy: hashproduct+rsync@gmail.com
         QAContact: rsync-qa@samba.org


I'd like an option that causes rsync to exit with a distinctive exit code,
say
26, if everything is successful and one or more files on the receiver were
changed (or would have been changed if --dry-run had not been used).  If
nothing on the receiver was changed, rsync should exit 0.

If rsync had this option, makefiles could implement better dependency logic for
commands that operate on large file trees by using rsync to detect whether a
file tree has changed.  Specifically, my Web site's build system calls rsync
once to collect the files to be posted into a temporary folder and again to
push the temporary folder to the server I'm using.  I'd like to skip the
second
rsync if the first rsync does not modify the temporary folder.


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https://bugzilla.samba.org/show_bug.cgi?id=3787


wayned@samba.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




------- Comment #1 from wayned@samba.org  2006-05-30 15:22 MST -------
It seems to me that it would be just as easy to ask rsync to itemize the
changes (see -i) and then filter the output.  For instance:

if rsync -ai /src/ /dest/ | grep '^[<>]f' >/dev/null; then
    echo rsync copied one or more files
else
    echo rsync copied no files
fi

Or, if you need to see the output, substitute something like a perl script for
the grep.  Here's one that runs an rsync command (complete with output) and
sets the return code as appropriate:

#!/usr/bin/perl
open(RSYNC, '-|', 'rsync -ai popt /var/tmp/') or die $!;
while (<RSYNC>) {
    $found = 1 if /^[<>]f/;
    print;
}
close RSYNC;
$status = $? >> 8;
exit($found ? 26 : $status);

Both these options give you full control over what you consider important.  For
instance, the above checks only consider updated files important.  You could
have different exit codes for updated permissions, updated symlinks, or
whatever you need.


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