automatic way to provide properties to commands in `postBuildSteps`

[steveej]

currently i have the following hardcoded

            props = lib.attrsets.genAttrs [
              "attr"
              "basename"
              "branch"
              "builddir"
              "builderid"
              "buildername"
              "buildnumber"
              "cacheStatus"
              "codebase"
              "drv_path"
              "event"
              "github.base.sha"
              "github.head.sha"
              "out_path"
              "owners"
              "project"
              "projectid"
              "projectname"
              "pullrequesturl"
              "repository"
              "revision"
              "scheduler"
              "status_name"
              "system"
              "virtual_builder_name"
              "virtual_builder_tags"
              "workername"
            ] (name: self.inputs.buildbot-nix.lib.interpolate "%(prop:${name})s");

this list is just copied and pasted from the properties i saw on the web UI, and surely diverges for other forges and maybe even other projects on github. having a machine-readable way at runtime with all available properties would be nice.

[Mic92]

Can this not be provided by the writer of postBuildSteps as needed? Maybe documenting known portable ones would be a nice addition to documentation.

[Mic92]

The variable that you posted, can you explain how this is going to be used in the actual post hook?

[steveej]

in this case i experimented with exposing these values as environment variables

   postBuildSteps = [
      {
        name = "post-build-step-test";
        environment =
          let
            props = lib.attrsets.genAttrs [
              "attr"
              "basename"
              # ...
            ] (name: self.inputs.buildbot-nix.lib.interpolate "%(prop:${name})s");
            props' = lib.attrsets.mapAttrs' (name: value: lib.nameValuePair "PROP_${name}" value) props;
          in
          props';

however, a preferred alternative that could be to write a single structured file (e.g. json or toml) that's discoverable via a single environment variable. this file could also include other namespaced information such as %(secret:..)s, %(kw:...)s, etc..

[MagicRB]

This is more to be done from the python side. As in we can by default expose all properties as environment variables or make it togglable per PBS (postbuildstep)