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 } } }
To start hacking on Hydra, run:
$ nix-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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