Commits on Jul 11, 2019

1. Add new multi-arch build layout mode …

   Add a new mode which allows cosa to manipulate multi-arch build layouts:
   
   ```
   $ find builds
   builds
   builds/builds.json
   builds/30.1
   builds/30.1/x86_64
   builds/30.1/x86_64/coreos-assembler-config.tar.gz
   builds/30.1/x86_64/coreos-assembler-config-git.json
   builds/30.1/x86_64/fedora-coreos-30.1-qemu.qcow2
   ...
   ```
   
   A pipeline could e.g. dispatch builds for each architecture on different
   nodes, then group them back into a single workdir and have it
   manipulated by e.g. `buildupload` seamlessly.
   
   This new layout also matches the bucket layout for FCOS (see
   coreos/fedora-coreos-tracker#189).
   
   The basic idea is to add a `schema-version` to `builds.json` and denote
   the legacy behaviour as "pre-1.0.0", while `1.0.0` contains a different
   schema: each element in the `builds` array is now an object, which has
   an `id`, and a list of `archs` for which that build has been built:
   
   ```
   $ cat builds/builds.json
   {
       "schema-version": "1.0.0",
       "builds": [
           {
               "id": "30.1",
               "archs": [
                   "x86_64"
               ]
           }
       ],
       "timestamp": "2019-06-28T20:50:54Z"
   }
   ```
   
   We retain backwards-compatibility by simply checking the schema version.
   Right now, only new workdirs will have this layout. Pipelines which use
   `buildprep` will fetch `builds.json` as is and key off of its contents
   to determine the bucket layout as well. We can write new code in the
   future to convert previously single-arch buckets into the new layout to
   then enable multi-arch.

   

   jlebon committed Jul 11, 2019
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