{"id":15531462,"url":"https://github.com/squiddev/scrutiny","last_synced_at":"2026-01-11T02:20:53.051Z","repository":{"id":45643223,"uuid":"320092001","full_name":"SquidDev/scrutiny","owner":"SquidDev","description":"Bits and bobs for wrangling my server.","archived":false,"fork":false,"pushed_at":"2024-06-13T11:38:54.000Z","size":312,"stargazers_count":2,"open_issues_count":0,"forks_count":0,"subscribers_count":3,"default_branch":"dev","last_synced_at":"2025-02-06T05:44:36.102Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"","language":"OCaml","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"bsd-3-clause","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/SquidDev.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2020-12-09T22:10:15.000Z","updated_at":"2024-06-13T11:38:57.000Z","dependencies_parsed_at":"2023-12-21T22:31:20.362Z","dependency_job_id":"43fc92e2-0c2d-4193-8d78-7c7eebcf08c9","html_url":"https://github.com/SquidDev/scrutiny","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/SquidDev%2Fscrutiny","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/SquidDev%2Fscrutiny/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/SquidDev%2Fscrutiny/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/SquidDev%2Fscrutiny/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/SquidDev","download_url":"https://codeload.github.com/SquidDev/scrutiny/tar.gz/refs/heads/dev","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":246399797,"owners_count":20770907,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-10-02T11:26:17.507Z","updated_at":"2026-01-11T02:20:53.012Z","avatar_url":"https://github.com/SquidDev.png","language":"OCaml","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Scrutiny\nScrutiny is a small collection of OCaml utilities for maintaining and monitoring\nmy server. Its main component is a configuration management system, but also\nincludes some useful libraries and a prometheus exporter for systemd services.\n\nWhile I use scrutiny to manage my own server, I wouldn't recommend it to other\npeople - it's still in flux, and there's plenty of better tools out there. I\njust enjoy reinventing the wheel far too much.\n\n## `scrutiny-infra`: Another configuration management system\nScrutiny is another configuration management system, designed for pushing config\nto a single server (or potentially a _very_ small fleet of servers). It draws\ninspiration from systems like [Ansible] and [Salt], while attempting to overcome\nsome of their shortcomings.\n\n### Example\nRather than using YAML (or worse, YAML and Jinga 2 templates), resources\n(anything managed by Scrutiny) are described in OCaml.\n\nFor instance, here's how one may configure a basic web server:\n\n```ml\n(* Upload a config file to /etc/nginx/nginx.conf, based on the nginx.conf template *)\nlet* conf =\n  template (Fpath.v \"/etc/nginx/nginx.conf\") ~template:Fpath.(templates / \"nginx.conf\")\n  @@ fun () -\u003e value []\nin\nlet* unit_file = template (Fpath.v \"/etc/systemd/system/openresty.service\") (* ... *)\nin\n(* Ensure the \"openresty\" service is enabled and running. This only runs once our\n  config file and systemd service have been updated. If either have changed, the\n  openresty service will be restarted or reloaded as appropriate. *)\nlet* _service =\n  service ~name:\"openresty\" ~scope:`System @@ fun () -\u003e\n  let+ () = need ~options:`Reload conf\n  and+ () = need ~options:`Restart unit_file in\n  service_state ~enabled:true ~running:true ~monitor:5 ()\nin\npure ()\n```\n\nThis is a little confusing, especially for those not used to OCaml's syntax, so\nlet's highlight a few things here:\n\n - Resources (something managed by scrutiny, like a file or service) are\n   declared by `let*` (within a `Rules.t` monad). Each resource has a name (such\n   as a file path) and a function to compute the desired state of this resource\n   (such as a file's contents).\n\n - Resources may declare a set of dependencies using `let+` and `and+`. These\n   are created and updated before this resource. For instance, our `openresty`\n   service obviously needs its configuration file!\n\n - The `need` function accepts additional metdata, which is passed to the\n   dependent resource when the dependency changes (for instance, reloading\n   openresty when a config file changes).\n\nWe can then compile this code into an executable and run it (annoying, I know,\nbut OCaml's compiler is fast). This then SSHes into your server and begins\npushing changes ([@purpleidea would argue that makes us an orchestrator rather\nthan a config manager][mgmt-info] - the distinction does confuse me).\n\n### Non-features\nScrutiny was very much written to scratch my itch. As a result, it's missing\nlots of features that others may find valuable:\n\n - **YAML or other configuration files:** While it's possible to write your own\n   system to load variables from disk, there's no support for it by default - I\n   just bake them into the code.\n\n   This does mean you also don't get useful features like inheritance/overrides.\n\n - **Encrypted/private resources:** Scrutiny reads directly from the filesystem,\n   and isn't smart enough to decrypt files. Combined with the above, this may\n   mean you're storing secrets in your executable - probably best avoided!\n\n - **Dynamic resources:** The entire resource graph must be known ahead-of-time.\n   While the desired state of a resource may change depending on the server\n   state, it's not possible to add/remove resources based on server state.\n\n - **Stability and support:** Look, it's just me using it!\n\n[ansible]: https://www.ansible.com/ \"Ansible is Simple IT Automation\"\n[salt]: https://saltproject.io/ \"Salt Project\"\n[mgmt-info]: https://purpleidea.com/blog/2016/01/18/next-generation-configuration-mgmt/\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsquiddev%2Fscrutiny","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsquiddev%2Fscrutiny","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsquiddev%2Fscrutiny/lists"}