349 lines
14 KiB
Scheme
349 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019 Jakob L. Kreuze <zerodaysfordays@sdf.lonestar.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu machine ssh)
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#:use-module (gnu machine)
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#:autoload (gnu packages gnupg) (guile-gcrypt)
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#:use-module (gnu system)
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#:use-module (gnu system file-systems)
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#:use-module (gnu system uuid)
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#:use-module (guix diagnostics)
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#:use-module (guix gexp)
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#:use-module (guix i18n)
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#:use-module (guix modules)
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#:use-module (guix monads)
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#:use-module (guix records)
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#:use-module (guix remote)
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#:use-module (guix scripts system reconfigure)
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#:use-module (guix ssh)
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-35)
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#:export (managed-host-environment-type
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machine-ssh-configuration
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machine-ssh-configuration?
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machine-ssh-configuration
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machine-ssh-configuration-host-name
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machine-ssh-configuration-port
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machine-ssh-configuration-user
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machine-ssh-configuration-session))
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;;; Commentary:
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;;;
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;;; This module implements remote evaluation and system deployment for
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;;; machines that are accessible over SSH and have a known host-name. In the
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;;; sense of the broader "machine" interface, we describe the environment for
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;;; such machines as 'managed-host.
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;;;
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;;; Code:
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;;;
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;;; Parameters for the SSH client.
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;;;
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(define-record-type* <machine-ssh-configuration> machine-ssh-configuration
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make-machine-ssh-configuration
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machine-ssh-configuration?
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this-machine-ssh-configuration
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(host-name machine-ssh-configuration-host-name) ; string
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(port machine-ssh-configuration-port ; integer
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(default 22))
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(user machine-ssh-configuration-user ; string
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(default "root"))
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(identity machine-ssh-configuration-identity ; path to a private key
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(default #f))
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(session machine-ssh-configuration-session ; session
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(default #f)))
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(define (machine-ssh-session machine)
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"Return the SSH session that was given in MACHINE's configuration, or create
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one from the configuration's parameters if one was not provided."
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(maybe-raise-unsupported-configuration-error machine)
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(let ((config (machine-configuration machine)))
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(or (machine-ssh-configuration-session config)
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(let ((host-name (machine-ssh-configuration-host-name config))
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(user (machine-ssh-configuration-user config))
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(port (machine-ssh-configuration-port config))
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(identity (machine-ssh-configuration-identity config)))
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(open-ssh-session host-name
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#:user user
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#:port port
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#:identity identity)))))
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;;;
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;;; Remote evaluation.
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;;;
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(define (managed-host-remote-eval machine exp)
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"Internal implementation of 'machine-remote-eval' for MACHINE instances with
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an environment type of 'managed-host."
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(maybe-raise-unsupported-configuration-error machine)
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(remote-eval exp (machine-ssh-session machine)))
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;;;
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;;; Safety checks.
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;;;
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(define (machine-check-file-system-availability machine)
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"Raise a '&message' error condition if any of the file-systems specified in
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MACHINE's 'system' declaration do not exist on the machine."
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(define file-systems
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(filter (lambda (fs)
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(and (file-system-mount? fs)
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(not (member (file-system-type fs)
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%pseudo-file-system-types))
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(not (memq 'bind-mount (file-system-flags fs)))))
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(operating-system-file-systems (machine-operating-system machine))))
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(define (check-literal-file-system fs)
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(define remote-exp
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#~(catch 'system-error
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(lambda ()
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(stat #$(file-system-device fs))
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#t)
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(lambda args
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(system-error-errno args))))
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(mlet %store-monad ((errno (machine-remote-eval machine remote-exp)))
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(when (number? errno)
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(raise (condition
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(&message
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(message (format #f (G_ "device '~a' not found: ~a")
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(file-system-device fs)
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(strerror errno)))))))
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(return #t)))
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(define (check-labeled-file-system fs)
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(define remote-exp
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(with-imported-modules '((gnu build file-systems))
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#~(begin
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(use-modules (gnu build file-systems))
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(find-partition-by-label #$(file-system-label->string
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(file-system-device fs))))))
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(mlet %store-monad ((result (machine-remote-eval machine remote-exp)))
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(unless result
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(raise (condition
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(&message
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(message (format #f (G_ "no file system with label '~a'")
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(file-system-label->string
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(file-system-device fs))))))))
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(return #t)))
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(define (check-uuid-file-system fs)
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(define remote-exp
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(with-imported-modules (source-module-closure
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'((gnu build file-systems)
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(gnu system uuid)))
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#~(begin
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(use-modules (gnu build file-systems)
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(gnu system uuid))
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(define uuid
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(string->uuid #$(uuid->string (file-system-device fs))))
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(find-partition-by-uuid uuid))))
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(mlet %store-monad ((result (machine-remote-eval machine remote-exp)))
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(unless result
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(raise (condition
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(&message
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(message (format #f (G_ "no file system with UUID '~a'")
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(uuid->string (file-system-device fs))))))))
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(return #t)))
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(mbegin %store-monad
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(mapm %store-monad check-literal-file-system
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(filter (lambda (fs)
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(string? (file-system-device fs)))
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file-systems))
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(mapm %store-monad check-labeled-file-system
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(filter (lambda (fs)
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(file-system-label? (file-system-device fs)))
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file-systems))
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(mapm %store-monad check-uuid-file-system
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(filter (lambda (fs)
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(uuid? (file-system-device fs)))
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file-systems))))
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(define (machine-check-initrd-modules machine)
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"Raise a '&message' error condition if any of the modules needed by
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'needed-for-boot' file systems in MACHINE are not available in the initrd."
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(define file-systems
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(filter file-system-needed-for-boot?
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(operating-system-file-systems (machine-operating-system machine))))
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(define (missing-modules fs)
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(define remote-exp
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(let ((device (file-system-device fs)))
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(with-imported-modules (source-module-closure
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'((gnu build file-systems)
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(gnu build linux-modules)
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(gnu system uuid)))
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#~(begin
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(use-modules (gnu build file-systems)
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(gnu build linux-modules)
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(gnu system uuid))
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(define dev
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#$(cond ((string? device) device)
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((uuid? device) #~(find-partition-by-uuid
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(string->uuid
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#$(uuid->string device))))
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((file-system-label? device)
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#~(find-partition-by-label
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(file-system-label->string #$device)))))
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(missing-modules dev '#$(operating-system-initrd-modules
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(machine-operating-system machine)))))))
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(mlet %store-monad ((missing (machine-remote-eval machine remote-exp)))
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(return (list fs missing))))
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(mlet %store-monad ((device (mapm %store-monad missing-modules file-systems)))
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(for-each (match-lambda
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((fs missing)
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(unless (null? missing)
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(raise (condition
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(&message
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(message (format #f (G_ "~a missing modules ~{ ~a~}~%")
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(file-system-device fs)
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missing))))))))
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device)
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(return #t)))
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(define (check-deployment-sanity machine)
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"Raise a '&message' error condition if it is clear that deploying MACHINE's
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'system' declaration would fail."
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(mbegin %store-monad
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(machine-check-file-system-availability machine)
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(machine-check-initrd-modules machine)))
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;;;
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;;; System deployment.
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;;;
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(define (machine-boot-parameters machine)
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"Monadic procedure returning a list of 'boot-parameters' for the generations
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of MACHINE's system profile, ordered from most recent to oldest."
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(define bootable-kernel-arguments
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(@@ (gnu system) bootable-kernel-arguments))
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(define remote-exp
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(with-extensions (list guile-gcrypt)
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(with-imported-modules (source-module-closure '((guix config)
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(guix profiles)))
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#~(begin
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(use-modules (guix config)
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(guix profiles)
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(ice-9 textual-ports))
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(define %system-profile
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(string-append %state-directory "/profiles/system"))
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(define (read-file path)
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(call-with-input-file path
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(lambda (port)
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(get-string-all port))))
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(map (lambda (generation)
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(let* ((system-path (generation-file-name %system-profile
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generation))
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(boot-parameters-path (string-append system-path
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"/parameters"))
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(time (stat:mtime (lstat system-path))))
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(list generation
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system-path
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time
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(read-file boot-parameters-path))))
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(reverse (generation-numbers %system-profile)))))))
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(mlet* %store-monad ((generations (machine-remote-eval machine remote-exp)))
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(return
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(map (lambda (generation)
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(match generation
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((generation system-path time serialized-params)
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(let* ((params (call-with-input-string serialized-params
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read-boot-parameters))
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(root (boot-parameters-root-device params))
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(label (boot-parameters-label params)))
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(boot-parameters
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(inherit params)
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(label
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(string-append label " (#"
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(number->string generation) ", "
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(let ((time (make-time time-utc 0 time)))
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(date->string (time-utc->date time)
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"~Y-~m-~d ~H:~M"))
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")"))
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(kernel-arguments
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(append (bootable-kernel-arguments system-path root)
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(boot-parameters-kernel-arguments params))))))))
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generations))))
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(define (deploy-managed-host machine)
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"Internal implementation of 'deploy-machine' for MACHINE instances with an
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environment type of 'managed-host."
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(maybe-raise-unsupported-configuration-error machine)
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(mlet %store-monad ((_ (check-deployment-sanity machine))
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(boot-parameters (machine-boot-parameters machine)))
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(let* ((os (machine-operating-system machine))
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(eval (cut machine-remote-eval machine <>))
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(menu-entries (map boot-parameters->menu-entry boot-parameters))
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(bootloader-configuration (operating-system-bootloader os))
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(bootcfg (operating-system-bootcfg os menu-entries)))
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(mbegin %store-monad
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(switch-to-system eval os)
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(upgrade-shepherd-services eval os)
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(install-bootloader eval bootloader-configuration bootcfg)))))
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;;;
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;;; Environment type.
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;;;
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(define managed-host-environment-type
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(environment-type
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(machine-remote-eval managed-host-remote-eval)
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(deploy-machine deploy-managed-host)
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(name 'managed-host-environment-type)
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(description "Provisioning for machines that are accessible over SSH
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and have a known host-name. This entails little more than maintaining an SSH
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connection to the host.")))
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(define (maybe-raise-unsupported-configuration-error machine)
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"Raise an error if MACHINE's configuration is not an instance of
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<machine-ssh-configuration>."
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(let ((config (machine-configuration machine))
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(environment (environment-type-name (machine-environment machine))))
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(unless (and config (machine-ssh-configuration? config))
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(raise (condition
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(&message
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(message (format #f (G_ "unsupported machine configuration '~a'
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for environment of type '~a'")
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config
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environment))))))))
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