= bug description =
Scratch builds on staging Koji submitted by staging Koschei fail with traceback: "HTTPError: HTTP Error 404: Not Found", for example see http://koji.stg.fedoraproject.org/koji/taskinfo?taskID=90001370

= bug analysis =
Koschei runs scratch builds from existing SRPMs, which in most cases are located in production Koji volume at /mnt/koji/vol/prod/. The problem is that this location is not exported through HTTP, so kojid on builders fails with HTTP 404 error.

= fix recommendation =
Either of the following two solutions:

1. Add rewrite rule to kojiweb.conf
   {{{
   RewriteRule ^/vol/prod/(.+) https://koji.fedoraproject.org/$1 [R=301,L]
   RewriteRule ^/vol/prod/packages/(.+) https://kojipkgs.fedoraproject.org/packages/$1 [R=301,L]
   }}}
   Pros: it should be faster - packages will be coming from squid cache at kojipkgs
   Cons: extra hosts entries may need to be added on some staging hosts so that they know how to connect to production koji and kojipkgs

2. Export contents of vol directory:
   {{{
   Alias /work "/mnt/koji/vol/"

<Directory "/mnt/koji/vol/">
Options Indexes FollowSymLinks
Require all granted
</Directory>
}}}
Pros: simple configuration
Cons: data is read directly from production NFS, which apparently is already under high load