e813444287
As requested here: <https://lists.gnu.org/archive/html/guix-devel/2020-02/msg00128.html>. * .mailmap: Add an entry for Jakob. * gnu/machine.scm, gnu/machine/digital-ocean.scm, gnu/machine/ssh.scm, gnu/packages/admin.scm, gnu/packages/i2p.scm, gnu/packages/music.scm, gnu/packages/web.scm, gnu/tests/reconfigure.scm, guix/scripts/deploy.scm, guix/scripts/system/reconfigure.scm: Update their e-mail address.
482 lines
20 KiB
Scheme
482 lines
20 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2019 Jakob L. Kreuze <zerodaysfordays@sdf.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 ssh)
|
||
#:use-module (gnu bootloader)
|
||
#:use-module (gnu machine)
|
||
#:autoload (gnu packages gnupg) (guile-gcrypt)
|
||
#:use-module (gnu system)
|
||
#:use-module (gnu system file-systems)
|
||
#:use-module (gnu system uuid)
|
||
#:use-module (guix diagnostics)
|
||
#:use-module (guix gexp)
|
||
#:use-module (guix i18n)
|
||
#:use-module (guix modules)
|
||
#:use-module (guix monads)
|
||
#:use-module (guix pki)
|
||
#:use-module (guix records)
|
||
#:use-module (guix remote)
|
||
#:use-module (guix scripts system reconfigure)
|
||
#:use-module (guix ssh)
|
||
#:use-module (guix store)
|
||
#:use-module (guix utils)
|
||
#:use-module (gcrypt pk-crypto)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 textual-ports)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-19)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-34)
|
||
#:use-module (srfi srfi-35)
|
||
#:export (managed-host-environment-type
|
||
|
||
machine-ssh-configuration
|
||
machine-ssh-configuration?
|
||
machine-ssh-configuration
|
||
|
||
machine-ssh-configuration-host-name
|
||
machine-ssh-configuration-build-locally?
|
||
machine-ssh-configuration-authorize?
|
||
machine-ssh-configuration-port
|
||
machine-ssh-configuration-user
|
||
machine-ssh-configuration-host-key
|
||
machine-ssh-configuration-session))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; This module implements remote evaluation and system deployment for
|
||
;;; machines that are accessible over SSH and have a known host-name. In the
|
||
;;; sense of the broader "machine" interface, we describe the environment for
|
||
;;; such machines as 'managed-host.
|
||
;;;
|
||
;;; Code:
|
||
|
||
|
||
;;;
|
||
;;; Parameters for the SSH client.
|
||
;;;
|
||
|
||
(define-record-type* <machine-ssh-configuration> machine-ssh-configuration
|
||
make-machine-ssh-configuration
|
||
machine-ssh-configuration?
|
||
(host-name machine-ssh-configuration-host-name) ; string
|
||
(system machine-ssh-configuration-system) ; string
|
||
(build-locally? machine-ssh-configuration-build-locally? ; boolean
|
||
(default #t))
|
||
(authorize? machine-ssh-configuration-authorize? ; boolean
|
||
(default #t))
|
||
(port machine-ssh-configuration-port ; integer
|
||
(default 22))
|
||
(user machine-ssh-configuration-user ; string
|
||
(default "root"))
|
||
(identity machine-ssh-configuration-identity ; path to a private key
|
||
(default #f))
|
||
(session machine-ssh-configuration-session ; session
|
||
(default #f))
|
||
(host-key machine-ssh-configuration-host-key ; #f | string
|
||
(default #f)))
|
||
|
||
(define (machine-ssh-session machine)
|
||
"Return the SSH session that was given in MACHINE's configuration, or create
|
||
one from the configuration's parameters if one was not provided."
|
||
(maybe-raise-unsupported-configuration-error machine)
|
||
(let ((config (machine-configuration machine)))
|
||
(or (machine-ssh-configuration-session config)
|
||
(let ((host-name (machine-ssh-configuration-host-name config))
|
||
(user (machine-ssh-configuration-user config))
|
||
(port (machine-ssh-configuration-port config))
|
||
(identity (machine-ssh-configuration-identity config))
|
||
(host-key (machine-ssh-configuration-host-key config)))
|
||
(unless host-key
|
||
(warning (G_ "<machine-ssh-configuration> without a 'host-key' \
|
||
is deprecated~%")))
|
||
(open-ssh-session host-name
|
||
#:user user
|
||
#:port port
|
||
#:identity identity
|
||
#:host-key host-key)))))
|
||
|
||
|
||
;;;
|
||
;;; Remote evaluation.
|
||
;;;
|
||
|
||
(define (machine-become-command machine)
|
||
"Return as a list of strings the program and arguments necessary to run a
|
||
shell command with escalated privileges for MACHINE's configuration."
|
||
(if (string= "root" (machine-ssh-configuration-user
|
||
(machine-configuration machine)))
|
||
'()
|
||
'("/run/setuid-programs/sudo" "-n" "--")))
|
||
|
||
(define (managed-host-remote-eval machine exp)
|
||
"Internal implementation of 'machine-remote-eval' for MACHINE instances with
|
||
an environment type of 'managed-host."
|
||
(maybe-raise-unsupported-configuration-error machine)
|
||
(let ((config (machine-configuration machine)))
|
||
(remote-eval exp (machine-ssh-session machine)
|
||
#:build-locally?
|
||
(machine-ssh-configuration-build-locally? config)
|
||
#:system
|
||
(machine-ssh-configuration-system config)
|
||
#:become-command
|
||
(machine-become-command machine))))
|
||
|
||
|
||
;;;
|
||
;;; Safety checks.
|
||
;;;
|
||
|
||
(define (machine-check-file-system-availability machine)
|
||
"Raise a '&message' error condition if any of the file-systems specified in
|
||
MACHINE's 'system' declaration do not exist on the machine."
|
||
(define file-systems
|
||
(filter (lambda (fs)
|
||
(and (file-system-mount? fs)
|
||
(not (member (file-system-type fs)
|
||
%pseudo-file-system-types))
|
||
(not (memq 'bind-mount (file-system-flags fs)))))
|
||
(operating-system-file-systems (machine-operating-system machine))))
|
||
|
||
(define (check-literal-file-system fs)
|
||
(define remote-exp
|
||
#~(catch 'system-error
|
||
(lambda ()
|
||
(stat #$(file-system-device fs))
|
||
#t)
|
||
(lambda args
|
||
(system-error-errno args))))
|
||
|
||
(mlet %store-monad ((errno (machine-remote-eval machine remote-exp)))
|
||
(when (number? errno)
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "device '~a' not found: ~a")
|
||
(file-system-device fs)
|
||
(strerror errno)))))))
|
||
(return #t)))
|
||
|
||
(define (check-labeled-file-system fs)
|
||
(define remote-exp
|
||
(with-imported-modules (source-module-closure
|
||
'((gnu build file-systems)))
|
||
#~(begin
|
||
(use-modules (gnu build file-systems))
|
||
(find-partition-by-label #$(file-system-label->string
|
||
(file-system-device fs))))))
|
||
|
||
(mlet %store-monad ((result (machine-remote-eval machine remote-exp)))
|
||
(unless result
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "no file system with label '~a'")
|
||
(file-system-label->string
|
||
(file-system-device fs))))))))
|
||
(return #t)))
|
||
|
||
(define (check-uuid-file-system fs)
|
||
(define remote-exp
|
||
(with-imported-modules (source-module-closure
|
||
'((gnu build file-systems)
|
||
(gnu system uuid)))
|
||
#~(begin
|
||
(use-modules (gnu build file-systems)
|
||
(gnu system uuid))
|
||
|
||
(define uuid
|
||
(string->uuid #$(uuid->string (file-system-device fs))))
|
||
|
||
(find-partition-by-uuid uuid))))
|
||
|
||
(mlet %store-monad ((result (machine-remote-eval machine remote-exp)))
|
||
(unless result
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "no file system with UUID '~a'")
|
||
(uuid->string (file-system-device fs))))))))
|
||
(return #t)))
|
||
|
||
(mbegin %store-monad
|
||
(mapm %store-monad check-literal-file-system
|
||
(filter (lambda (fs)
|
||
(string? (file-system-device fs)))
|
||
file-systems))
|
||
(mapm %store-monad check-labeled-file-system
|
||
(filter (lambda (fs)
|
||
(file-system-label? (file-system-device fs)))
|
||
file-systems))
|
||
(mapm %store-monad check-uuid-file-system
|
||
(filter (lambda (fs)
|
||
(uuid? (file-system-device fs)))
|
||
file-systems))))
|
||
|
||
(define (machine-check-initrd-modules machine)
|
||
"Raise a '&message' error condition if any of the modules needed by
|
||
'needed-for-boot' file systems in MACHINE are not available in the initrd."
|
||
(define file-systems
|
||
(filter file-system-needed-for-boot?
|
||
(operating-system-file-systems (machine-operating-system machine))))
|
||
|
||
(define (missing-modules fs)
|
||
(define remote-exp
|
||
(let ((device (file-system-device fs)))
|
||
(with-imported-modules (source-module-closure
|
||
'((gnu build file-systems)
|
||
(gnu build linux-modules)
|
||
(gnu system uuid)))
|
||
#~(begin
|
||
(use-modules (gnu build file-systems)
|
||
(gnu build linux-modules)
|
||
(gnu system uuid))
|
||
|
||
(define dev
|
||
#$(cond ((string? device) device)
|
||
((uuid? device) #~(find-partition-by-uuid
|
||
(string->uuid
|
||
#$(uuid->string device))))
|
||
((file-system-label? device)
|
||
#~(find-partition-by-label
|
||
#$(file-system-label->string device)))))
|
||
|
||
(missing-modules dev '#$(operating-system-initrd-modules
|
||
(machine-operating-system machine)))))))
|
||
(mlet %store-monad ((missing (machine-remote-eval machine remote-exp)))
|
||
(return (list fs missing))))
|
||
|
||
(mlet %store-monad ((device (mapm %store-monad missing-modules file-systems)))
|
||
(for-each (match-lambda
|
||
((fs missing)
|
||
(unless (null? missing)
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "~a missing modules ~{ ~a~}~%")
|
||
(file-system-device fs)
|
||
missing))))))))
|
||
device)
|
||
(return #t)))
|
||
|
||
(define (machine-check-building-for-appropriate-system machine)
|
||
"Raise a '&message' error condition if MACHINE is configured to be built
|
||
locally and the 'system' field does not match the '%current-system' reported
|
||
by MACHINE."
|
||
(let ((config (machine-configuration machine))
|
||
(system (remote-system (machine-ssh-session machine))))
|
||
(when (and (machine-ssh-configuration-build-locally? config)
|
||
(not (string= system (machine-ssh-configuration-system config))))
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "incorrect target system \
|
||
('~a' was given, while the system reports that it is '~a')~%")
|
||
(machine-ssh-configuration-system config)
|
||
system)))))))
|
||
(with-monad %store-monad (return #t)))
|
||
|
||
(define (check-deployment-sanity machine)
|
||
"Raise a '&message' error condition if it is clear that deploying MACHINE's
|
||
'system' declaration would fail."
|
||
;; Order is important here -- an incorrect value for 'system' will cause
|
||
;; invocations of 'remote-eval' to fail.
|
||
(mbegin %store-monad
|
||
(machine-check-building-for-appropriate-system machine)
|
||
(machine-check-file-system-availability machine)
|
||
(machine-check-initrd-modules machine)))
|
||
|
||
|
||
;;;
|
||
;;; System deployment.
|
||
;;;
|
||
|
||
(define (machine-boot-parameters machine)
|
||
"Monadic procedure returning a list of 'boot-parameters' for the generations
|
||
of MACHINE's system profile, ordered from most recent to oldest."
|
||
(define bootable-kernel-arguments
|
||
(@@ (gnu system) bootable-kernel-arguments))
|
||
|
||
(define remote-exp
|
||
(with-extensions (list guile-gcrypt)
|
||
(with-imported-modules (source-module-closure '((guix config)
|
||
(guix profiles)))
|
||
#~(begin
|
||
(use-modules (guix config)
|
||
(guix profiles)
|
||
(ice-9 textual-ports))
|
||
|
||
(define %system-profile
|
||
(string-append %state-directory "/profiles/system"))
|
||
|
||
(define (read-file path)
|
||
(call-with-input-file path
|
||
(lambda (port)
|
||
(get-string-all port))))
|
||
|
||
(map (lambda (generation)
|
||
(let* ((system-path (generation-file-name %system-profile
|
||
generation))
|
||
(boot-parameters-path (string-append system-path
|
||
"/parameters"))
|
||
(time (stat:mtime (lstat system-path))))
|
||
(list generation
|
||
system-path
|
||
time
|
||
(read-file boot-parameters-path))))
|
||
(reverse (generation-numbers %system-profile)))))))
|
||
|
||
(mlet* %store-monad ((generations (machine-remote-eval machine remote-exp)))
|
||
(return
|
||
(map (lambda (generation)
|
||
(match generation
|
||
((generation system-path time serialized-params)
|
||
(let* ((params (call-with-input-string serialized-params
|
||
read-boot-parameters))
|
||
(root (boot-parameters-root-device params))
|
||
(label (boot-parameters-label params)))
|
||
(boot-parameters
|
||
(inherit params)
|
||
(label
|
||
(string-append label " (#"
|
||
(number->string generation) ", "
|
||
(let ((time (make-time time-utc 0 time)))
|
||
(date->string (time-utc->date time)
|
||
"~Y-~m-~d ~H:~M"))
|
||
")"))
|
||
(kernel-arguments
|
||
(append (bootable-kernel-arguments system-path root)
|
||
(boot-parameters-kernel-arguments params))))))))
|
||
generations))))
|
||
|
||
(define-syntax-rule (with-roll-back should-roll-back? mbody ...)
|
||
"Catch exceptions that arise when binding MBODY, a monadic expression in
|
||
%STORE-MONAD, and collect their arguments in a &deploy-error condition, with
|
||
the 'should-roll-back' field set to SHOULD-ROLL-BACK?"
|
||
(catch #t
|
||
(lambda ()
|
||
mbody ...)
|
||
(lambda args
|
||
(raise (condition (&deploy-error
|
||
(should-roll-back should-roll-back?)
|
||
(captured-args args)))))))
|
||
|
||
(define (deploy-managed-host machine)
|
||
"Internal implementation of 'deploy-machine' for MACHINE instances with an
|
||
environment type of 'managed-host."
|
||
(maybe-raise-unsupported-configuration-error machine)
|
||
(when (machine-ssh-configuration-authorize?
|
||
(machine-configuration machine))
|
||
(unless (file-exists? %public-key-file)
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "no signing key '~a'. \
|
||
have you run 'guix archive --generate-key?'")
|
||
%public-key-file))))))
|
||
(remote-authorize-signing-key (call-with-input-file %public-key-file
|
||
(lambda (port)
|
||
(string->canonical-sexp
|
||
(get-string-all port))))
|
||
(machine-ssh-session machine)
|
||
(machine-become-command machine)))
|
||
(mlet %store-monad ((_ (check-deployment-sanity machine))
|
||
(boot-parameters (machine-boot-parameters machine)))
|
||
(let* ((os (machine-operating-system machine))
|
||
(eval (cut machine-remote-eval machine <>))
|
||
(menu-entries (map boot-parameters->menu-entry boot-parameters))
|
||
(bootloader-configuration (operating-system-bootloader os))
|
||
(bootcfg (operating-system-bootcfg os menu-entries)))
|
||
(mbegin %store-monad
|
||
(with-roll-back #f
|
||
(switch-to-system eval os))
|
||
(with-roll-back #t
|
||
(mbegin %store-monad
|
||
(upgrade-shepherd-services eval os)
|
||
(install-bootloader eval bootloader-configuration bootcfg)))))))
|
||
|
||
|
||
;;;
|
||
;;; Roll-back.
|
||
;;;
|
||
|
||
(define (roll-back-managed-host machine)
|
||
"Internal implementation of 'roll-back-machine' for MACHINE instances with
|
||
an environment type of 'managed-host."
|
||
(define remote-exp
|
||
(with-extensions (list guile-gcrypt)
|
||
(with-imported-modules (source-module-closure '((guix config)
|
||
(guix profiles)))
|
||
#~(begin
|
||
(use-modules (guix config)
|
||
(guix profiles))
|
||
|
||
(define %system-profile
|
||
(string-append %state-directory "/profiles/system"))
|
||
|
||
(define target-generation
|
||
(relative-generation %system-profile -1))
|
||
|
||
(if target-generation
|
||
(switch-to-generation %system-profile target-generation)
|
||
'error)))))
|
||
|
||
(define roll-back-failure
|
||
(condition (&message (message (G_ "could not roll-back machine")))))
|
||
|
||
(mlet* %store-monad ((boot-parameters (machine-boot-parameters machine))
|
||
(_ -> (if (< (length boot-parameters) 2)
|
||
(raise roll-back-failure)))
|
||
(entries -> (map boot-parameters->menu-entry
|
||
(list (second boot-parameters))))
|
||
(old-entries -> (map boot-parameters->menu-entry
|
||
(drop boot-parameters 2)))
|
||
(bootloader -> (operating-system-bootloader
|
||
(machine-operating-system machine)))
|
||
(bootcfg (lower-object
|
||
((bootloader-configuration-file-generator
|
||
(bootloader-configuration-bootloader
|
||
bootloader))
|
||
bootloader entries
|
||
#:old-entries old-entries)))
|
||
(remote-result (machine-remote-eval machine remote-exp)))
|
||
(when (eqv? 'error remote-result)
|
||
(raise roll-back-failure))))
|
||
|
||
|
||
;;;
|
||
;;; Environment type.
|
||
;;;
|
||
|
||
(define managed-host-environment-type
|
||
(environment-type
|
||
(machine-remote-eval managed-host-remote-eval)
|
||
(deploy-machine deploy-managed-host)
|
||
(roll-back-machine roll-back-managed-host)
|
||
(name 'managed-host-environment-type)
|
||
(description "Provisioning for machines that are accessible over SSH
|
||
and have a known host-name. This entails little more than maintaining an SSH
|
||
connection to the host.")))
|
||
|
||
(define (maybe-raise-unsupported-configuration-error machine)
|
||
"Raise an error if MACHINE's configuration is not an instance of
|
||
<machine-ssh-configuration>."
|
||
(let ((config (machine-configuration machine))
|
||
(environment (environment-type-name (machine-environment machine))))
|
||
(unless (and config (machine-ssh-configuration? config))
|
||
(raise (condition
|
||
(&message
|
||
(message (format #f (G_ "unsupported machine configuration '~a'
|
||
for environment of type '~a'")
|
||
config
|
||
environment))))))))
|