Enable declarative projects.

This allows fully declarative project specifications. This is best illustrated by example:

  • I create a new project, setting the declarative spec file to "spec.json" and the declarative input to a git repo pointing at git://github.com/shlevy/declarative-hydra-example.git
  • hydra creates a special ".jobsets" jobset alongside the project
  • Just before evaluating the ".jobsets" jobset, hydra fetches declarative-hydra-example.git, reads spec.json as a jobset spec, and updates the jobset's configuration accordingly: { "enabled": 1, "hidden": false, "description": "Jobsets", "nixexprinput": "src", "nixexprpath": "default.nix", "checkinterval": 300, "schedulingshares": 100, "enableemail": false, "emailoverride": "", "keepnr": 3, "inputs": { "src": { "type": "git", "value": "git://github.com/shlevy/declarative-hydra-example.git", "emailresponsible": false }, "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs.git release-16.03", "emailresponsible": false } } }
  • When the "jobsets" job of the ".jobsets" jobset completes, hydra reads its output as a JSON representation of a dictionary of jobset specs and creates a jobset named "master" configured accordingly (In this example, this is the same configuration as .jobsets itself, except using release.nix instead of default.nix): { "enabled": 1, "hidden": false, "description": "js", "nixexprinput": "src", "nixexprpath": "release.nix", "checkinterval": 300, "schedulingshares": 100, "enableemail": false, "emailoverride": "", "keepnr": 3, "inputs": { "src": { "type": "git", "value": "git://github.com/shlevy/declarative-hydra-example.git", "emailresponsible": false }, "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs.git release-16.03", "emailresponsible": false } } }

Created by  Shea Levy  on March 11, 2016
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