Re: Problem with tags and aliases

[Doug Carr]

After a bit of poking around, found the cause of my problems.  When I do 
the 'cvs checkout -r WA_TAG_DAC elan-ied', it looks like CVS works like 
this:

1.  Cvs checks the 'CVSROOT/val-tags' file to see if WA_TAG_DAC exists. 
 If it does, go to #3.  If it does not, go to #2

2.  Using the first entry in the alias ('bin' in my example below), 
search the files to see if any of them have WA_TAG_DAC.  If the tag is 
found, add it to 'CVSROOT/val-tags' and go to #3.  If the tag does NOT 
exist go to #4 WITHOUT processing any of the other entries in the alias.

3.  Process the command (in my case, checkout) and exit.

4.  Issue the 'no such tag' error and exit.

My problem is that 'bin' directory: it contains no files, so #2 doesn't 
find the tag and goes to #4.  The quick solution for now is for me to 
move 'bin' down the alias list, behind a module that actually has files 
in it (libs in my case).

But... If that first module in the alias contains files but none of 
those files contain the tag (perhaps I only tagged a subset of all the 
modules in the alias), the same thing happens - and this isn't too easy 
to work around.

I would expect cvs to look in all of the aliased modules to see if the 
tag exists in ANY module before it issues the 'no such tag' error - 
otherwise, using alias and tags is an indeterminate process -> if 
val-tags has been updated (perhaps someine did a command with '-r <TAG>' 
with a plain module sometime in the past) I get one result; if val-tags 
has not been updated, then I get a different result.

Just out of curiosity, why isn't val-tags update when a tag is applied?

Thanks,

Doug.

> Hi all,
>
>    Apologies if this appears in the list more than once: email problems...
>
>   I'm having a problem with tags when I try and access them through an 
> alias.  If I create the tag against the alias with rtag and then try to 
> access it through the alias, I get a 'no such tag' error.  If I access 
> the tag using a module name, then it finds the tag.  If I then try the 
> alias again, it now finds the tag. See below for the details.  I think 
> it affects only one of my 8 CVS repositories, and I can't spot any 
> obvious differences between the problem one and the others.
>
>   Any ideas on a solution or where to start looking?
>
> Thanks,
> Doug.
>
> ================
>
> elan-iedm is an alias defined in the elan_ied/CVSROOT/modules files as
>   base_iedm_alias -a bin libs iedcore makeenv shared shared_utils sel 
> sel351s CvsToIdcs abb pdrv appl cfg
>   elan-iedm       &base_iedm_alias
>
> CVSROOT is
>   :pserver:address@hidden:/cvsrootdir/elan_ied
>
> Apply tag in an empty directory:
>   cvs -f rtag -R   -r HEAD WA_TAG_DAC elan-iedm
>
> val-tags contents:
>   WA_TAG_6 y
>   WA_BRANCH_6 y
>   WA_TAG_123 y
>   WA_TAG_1234 y
>
> Grepping the files in the repository for WA_TAG_DAC returns a bunch of 
> matches
>
> Use the tag with the alias
>   cvs -fQ checkout -r WA_TAG_DAC elan-iedm
>   results in
>       cvs [server aborted]: no such tag WA_TAG_DAC
>   and no directory created or populated
>
> val-tags contents:
>   WA_TAG_6 y
>   WA_BRANCH_6 y
>   WA_TAG_123 y
>   WA_TAG_1234 y
>
> Use the tag with a module instead of the alias
>   cvs -fQ checkout -r WA_TAG_DAC libs
>   results in the 'libs' directory created and populated
>
> val-tags contents:
>   WA_TAG_6 y
>   WA_BRANCH_6 y
>   WA_TAG_123 y
>   WA_TAG_1234 y
>   WA_TAG_DAC y
>
> Remove the libs directory
>   rm -rf libs
>
> Use the tag with the alias
>   cvs -fQ checkout -r WA_TAG_DAC elan-iedm
>   results in the 'elan-iedm' directory created and populated
>
> val-tags contents:
>   WA_TAG_6 y
>   WA_BRANCH_6 y
>   WA_TAG_123 y
>   WA_TAG_1234 y
>   WA_TAG_DAC y
>
> Cvs version is
>   cvs --version
>
>   Concurrent Versions System (CVS) 1.11.4 (client/server)
>
>   Copyright (c) 1989-2002 Brian Berliner, david d `zoo' zuhn,
>                           Jeff Polk, and other authors
>
>   CVS 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
> Client info
>   uname -a
>   Linux clientmachine 2.4.18-8.2mdk #1 Tue Jun 25 03:05:52 MDT 2002 i586 
> unknown
> Server info
>   uname -a
>   Linux servermachine 2.4.18-6mdk #1 Fri Mar 15 02:59:08 CET 2002 i686 
> unknown
> Val-tags
>   -rw-rw-rw-    1 myname  cvsgroup       65 Apr  9 10:43    val-tags


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