The CVS Tag plugin incorrectly invokes "cvs rtag" with both of the mutually
exclusive "-r" and "-D" options:

BUILD SUCCESSFUL
Total time: 1 minute 54 seconds
Executing tag command: cvs -d
:pserver:pbdev@sourceforge.uk.db.com:/data/cvsroot/fennel rtag -r
branch_Fennel_02_12 -D "2008-11-11 21:24" Fennel_SRV_B_02_12_1 fennel-server
[hudson31254tmp] $ cvs -d
:pserver:pbdev@sourceforge.uk.db.com:/data/cvsroot/fennel rtag -r
branch_Fennel_02_12 -D "2008-11-11 21:24" Fennel_SRV_B_02_12_1 fennel-server
cvs [rtag aborted]: -r and -D options are mutually exclusive
FATAL: Perform CVS tagging on succesful build failed. exit code=1
cleaning up /var/tmp/hudson31254tmp
finished: SUCCESS

—

Notice that the "cvs rtag" help shows that the user may apply only one of "-r"
or "-D":

uat:fennel-server% cvs --help rtag
Usage: cvs rtag [-aflRnF] [-b] [-d] [-r rev|-D date] tag modules...
-a Clear tag from removed files that would not otherwise be tagged.
-f Force a head revision match if tag/date not found.
-l Local directory only, not recursive
-R Process directories recursively.
-n No execution of 'tag program'
-d Delete the given Tag.
-b Make the tag a "branch" tag, allowing concurrent development.
-r rev Existing revision/tag.
-D Existing date.
-F Move tag if it already exists
(Specify the --help global option for a list of other help options)
may be copied only under the terms of the GNU General Public License,
a copy of which can be found with the CVS distribution kit.

Specify the --help option for further information about CVS
###
uat:fennel-server% cvs --version

Concurrent Versions System (CVS) 1.11 (client/server)

Copyright (c) 1989-2000 Brian Berliner, david d `zoo' zuhn,
Jeff Polk, and other authors