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System layout
-------------

1) one source server

   Maintains the source repository and project/package configurations.
   It is the only interface for api stack and it may forward requests to
   one of the repository servers

2) N repository servers

   a repository server provides access to the repositories of
   some projects/packages/architectures. It also maintains the
   build client worker pool, sending jobs to the clients and informing
   the schedulers about finished jobs.

3) N*A schedulers

   A scheduler maintains all projects/packages of the corresponding
   repository server, but for just one architecture. It is responsible
   for starting jobs in the right order, collecting the built
   binary packages and creating the external repository if a
   project's repository is completely built.
   The schedulers need to run on the same system as the repository
   servers.

4) M build clients

   The build clients contact the repository servers for jobs, build
   the jobs and send the result back to the repository server.

The most simple setup is one source server, one repository server and
schedulers for every involved architecture.


Code conventions
----------------

standard variable names:

$proj    project structure
$projid  project name ($proj->{'name'})
$repoid  repository name
$arch    architecture
$pack    package structure
$packid  package name
$prp     "$projid/$repoid"
$prpa    "$projid/$repoid/$arch"