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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 David Thompson <davet@gnu.org>
;;; Copyright © 2019 Jakob L. Kreuze <zerodaysfordays@sdf.lonestar.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu machine)
  #:use-module (gnu system)
  #:use-module (guix derivations)
  #:use-module (guix monads)
  #:use-module (guix records)
  #:use-module (guix store)
  #:use-module ((guix utils) #:select (source-properties->location))
  #:use-module (srfi srfi-35)
  #:export (environment-type
            environment-type?
            environment-type-name
            environment-type-description
            environment-type-location

            machine
            machine?
            this-machine

            machine-operating-system
            machine-environment
            machine-configuration
            machine-display-name

            deploy-machine
            roll-back-machine
            machine-remote-eval

            &deploy-error
            deploy-error?
            deploy-error-should-roll-back
            deploy-error-captured-args))

;;; Commentary:
;;;
;;; This module provides the types used to declare individual machines in a
;;; heterogeneous Guix deployment. The interface allows users of specify system
;;; configurations and the means by which resources should be provisioned on a
;;; per-host basis.
;;;
;;; Code:


;;;
;;; Declarations for resources that can be provisioned.
;;;

(define-record-type* <environment-type> environment-type
  make-environment-type
  environment-type?

  ;; Interface to the environment type's deployment code. Each procedure
  ;; should take the same arguments as the top-level procedure of this file
  ;; that shares the same name. For example, 'machine-remote-eval' should be
  ;; of the form '(machine-remote-eval machine exp)'.
  (machine-remote-eval environment-type-machine-remote-eval) ; procedure
  (deploy-machine      environment-type-deploy-machine)      ; procedure
  (roll-back-machine   environment-type-roll-back-machine)   ; procedure

  ;; Metadata.
  (name        environment-type-name)       ; symbol
  (description environment-type-description ; string
               (default #f))
  (location    environment-type-location    ; <location>
               (default (and=> (current-source-location)
                               source-properties->location))
               (innate)))


;;;
;;; Declarations for machines in a deployment.
;;;

(define-record-type* <machine> machine
  make-machine
  machine?
  this-machine
  (operating-system machine-operating-system) ; <operating-system>
  (environment      machine-environment)      ; symbol
  (configuration    machine-configuration     ; configuration object
                    (default #f)))            ; specific to environment

(define (machine-display-name machine)
  "Return the host-name identifying MACHINE."
  (operating-system-host-name (machine-operating-system machine)))

(define (machine-remote-eval machine exp)
  "Evaluate EXP, a gexp, on MACHINE. Ensure that all the elements EXP refers to
are built and deployed to MACHINE beforehand."
  (let ((environment (machine-environment machine)))
    ((environment-type-machine-remote-eval environment) machine exp)))

(define (deploy-machine machine)
  "Monadic procedure transferring the new system's OS closure to the remote
MACHINE, activating it on MACHINE and switching MACHINE to the new generation."
  (let ((environment (machine-environment machine)))
    ((environment-type-deploy-machine environment) machine)))

(define (roll-back-machine machine)
  "Monadic procedure rolling back to the previous system generation on
MACHINE. Return the number of the generation that was current before switching
and the new generation number."
  (let ((environment (machine-environment machine)))
    ((environment-type-roll-back-machine environment) machine)))


;;;
;;; Error types.
;;;

(define-condition-type &deploy-error &error
  deploy-error?
  (should-roll-back deploy-error-should-roll-back)
  (captured-args deploy-error-captured-args))
download.scm?id=0081807e161a8632ae2bddbcefc040d6992134c3'>guix: Replace defective freemirror.org....This ‘mirror’ is particularly problematic because it's the only one checked by ‘guix refresh’. * guix/gnu-maintenance.scm (%savannah-base): Substitute freedif.org. * guix/download.scm (%mirrors): Likewise. Reported by sash-kan on #guix. Tobias Geerinckx-Rice 2022-09-26download: Add a kernel.org mirror....Add the mirror from (guix gnu-maintenance) to make the simplified linux.org updater (of a later commit) work. * download.scm (%mirrors)[kernel.org]: Add mirrors.edge.kernel.org mirror. Signed-off-by: Ludovic Courtès <ludo@gnu.org> Maxime Devos 2022-09-26download: Switch savannah mirrors to HTTPS URLs....The URI scheme used for nongnu.freemirror.org needs to be consistent between (guix download) and (guix gnu-maintenance) to make the simplified savannah-updater (of a later commit) work. While we're at it, switch the other mirrors to https as well. http://download.savannah.gnu.org/releases-noredirect/ is left unmodified because it 404s * download.scm (%mirrors)[savannah]: Switch from http to https where possible. Signed-off-by: Ludovic Courtès <ludo@gnu.org> Maxime Devos 2022-07-24download: Refresh KDE mirror list....* guix/download.scm (%mirrors)[kde]: Update list, using HTTPS wherever possible. Tobias Geerinckx-Rice 2022-05-12download: Add a mirror for CTAN....* guix/download.scm (%mirrors)[ctan]: New entry. Maxim Cournoyer 2022-03-29download: Use https for main KDE source....* guix/download.scm (%mirrors)[kde]: Use https URIs for main KDE mirrors. * tests/lint.scm ("mirror-url: kde suggestion"): New test. Efraim Flashner