Fantastic, that really helped, I upgraded my koji instance from 1.4->1.6, 
built/added a RH6 builder box and added the [policy] entry to hub.conf...    It 
works beautifully.   (Also I noticed that there wasn't a 1.5->1.6 schema file.  
 I'm assuming that there weren't any schema changes) I just need to figure out 
this build error on the el6 builder box.

Traceback (most recent call last):
  File "/usr/sbin/mock", line 783, in <module>
    main(retParams)
  File "/usr/sbin/mock", line 693, in main
    uid=chroot.chrootuid, gid=chroot.chrootgid, cwd=options.cwd)
  File "/usr/lib/python2.6/site-packages/mock/backend.py", line 422, in doChroot
    shell=shell, *args, **kargs )
  File "<peak.util.decorators.rewrap wrapping mock.util.do at 0x00DB0488>", 
line 3, in do
  File "/usr/lib/python2.6/site-packages/mock/trace_decorator.py", line 70, in 
trace
    result = func(*args, **kw)
  File "/usr/lib/python2.6/site-packages/mock/util.py", line 281, in do
    preexec_fn = preexec,
  File "/usr/lib64/python2.6/subprocess.py", line 633, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.6/subprocess.py", line 1139, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied
Running the command manually and adding the --trace and -vvv flags...
 /usr/bin/mock -r koji/el6-extras-build-3660-5581 --no-clean --unpriv --cwd 
/tmp/scmroot/postgresql-9.0.2 --chroot make sources -vvvvv --trace
.....
DEBUG: mount -n -t sysfs  mock_chroot_sysfs  
/var/lib/mock/el6-extras-build-3660-5581/root/sys
INFO: ENTER do('mount -n -t sysfs  mock_chroot_sysfs  
/var/lib/mock/el6-extras-build-3660-5581/root/sys', True, None, None, 0, True, 
0, None, None, None, )
DEBUG: Executing command: mount -n -t sysfs  mock_chroot_sysfs  
/var/lib/mock/el6-extras-build-3660-5581/root/sys
DEBUG: Child returncode was: 0
INFO: LEAVE do --> 

INFO: LEAVE _mountall --> None

INFO: ENTER makeChrootPath(<mock.backend.Root object at 0x1237b50>, )
INFO: LEAVE makeChrootPath --> /var/lib/mock/el6-extras-build-3660-5581/root/

INFO: ENTER do(['make', 'sources'], False, 
'/var/lib/mock/el6-extras-build-3660-5581/root/', 
'/tmp/scmroot/postgresql-9.0.2', 0, True, 0, 500, 495, None, )
DEBUG: Executing command: ['make', 'sources']
INFO: EXCEPTION: [Errno 13] Permission denied
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/mock/trace_decorator.py", line 70, in 
trace
    result = func(*args, **kw)
  File "/usr/lib/python2.6/site-packages/mock/util.py", line 281, in do
    preexec_fn = preexec,
  File "/usr/lib64/python2.6/subprocess.py", line 633, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.6/subprocess.py", line 1139, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied
INFO: LEAVE do --> EXCEPTION RAISED

.......
I verified that my kojibuilder user is added to the mock group.   Anyone have a 
suggestion?   I also noticed that there's new koji-vm code.    The rpm 
description says "koji-vm contains a supplemental build daemon that executes 
certain tasks in a virtual machine."   I was wondering where I could find more 
info on this.

Brian

On Jan 3, 2011, at 1:36 PM, Mike McLean wrote:

> On 12/23/2010 06:10 PM, [email protected] wrote:
>> Hi All,
>> 
>> I'm trying to build el6 on a koji build host that is el5.5.
> 
> The stock rhel5 version of rpm cannot handle this. You'll need to build
> your own.
> 
>> I believe that what I may want to do is create a el6 build host and
>> use channels to control which host builds the el6 dist tag.
>> However, I cannot seem to find information on how to create and use
>> custom channels with koji and only vague references to the concept of
>> channels in koji.   For instance my questions would be:
> 
> This will work also. To direct different builds to different channels, 
> you'll need to write a custom channel policy. You can read more about 
> that here: https://fedoraproject.org/wiki/Koji/Policies
> 
> $ koji help --admin |grep channel
>         add-host-to-channel       Add a host to a channel
>         remove-host-from-channel  Remove a host from a channel
> 
> In koji-1.5.0 and later, the add-host-to-channel command supports a 
> --new option that will create the channel. Otherwise, you can add it in 
> the db manually with a simple insert... something like: insert into 
> channels(name) values('my-new-channel').
> 
> For your channel policy, you'll want to go with a small variation of the 
> default, so something like:
> 
> channel =
>        has req_channel :: req
>        is_child_task :: parent
>        method build && match target dist-6E-* :: use my-new-channel
>        all :: use default
> 
>> How to create a new channel? How to associate a tag/target/dist with
>> a channel? I'm assuming that the koji add-host-to-channel command
>> would add the new el6 host correctly, but how to then remove the the
>> new host from the "default" channel so that it doesn't build el5 and
>> which,. I suspect, would have the same rpm db issues in reverse.
> 
> The reverse issue does not occur. An el6 box can build el5 packages just 
> fine.
> 
> However, if you still want to remove hosts from a channel, you can use 
> the remove-host-from-channel command.
> --
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> [email protected]
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