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machine: ssh: Gracefully handle failure of the effectful bits.

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Previously, '&inferior-exception' raised by 'upgrade-shepherd-services'
and co. would go through as-is, leaving users with an ugly backtrace.

* gnu/machine/ssh.scm (deploy-managed-host): Define
'eval/error-handling' and use it in lieu of EVAL as arguments to
'switch-to-system', 'upgrade-shepherd-services', and
'install-bootloader'.
This commit is contained in:
Ludovic Courtès 2021-06-01 22:35:28 +02:00
parent 0db906c52c
commit 2885c3568e
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 37 additions and 3 deletions
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40
gnu/machine/ssh.scm
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@ -38,6 +38,9 @@
#:use-module (guix store)
#:use-module (guix utils)
#:use-module ((guix self) #:select (make-config.scm))
#:use-module ((guix inferior)
#:select (inferior-exception?
inferior-exception-arguments))
#:use-module (gcrypt pk-crypto)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
@ -443,17 +446,46 @@ have you run 'guix archive --generate-key?'")
(mlet %store-monad ((_ (check-deployment-sanity machine))
(boot-parameters (machine-boot-parameters machine)))
(let* ((os (machine-operating-system machine))
(host (machine-ssh-configuration-host-name
(machine-configuration 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)))
(define-syntax-rule (eval/error-handling condition handler ...)
;; Return a wrapper around EVAL such that HANDLER is evaluated if an
;; exception is raised.
(lambda (exp)
(lambda (store)
(guard (condition ((inferior-exception? condition)
(values (begin handler ...) store)))
(run-with-store store (eval exp))))))
(mbegin %store-monad
(with-roll-back #f
(switch-to-system eval os))
(switch-to-system (eval/error-handling c
(raise (formatted-message
(G_ "\
failed to switch systems while deploying '~a':~%~{~s ~}")
host
(inferior-exception-arguments c))))
os))
(with-roll-back #t
(mbegin %store-monad
(upgrade-shepherd-services eval os)
(install-bootloader eval bootloader-configuration bootcfg)))))))
(upgrade-shepherd-services (eval/error-handling c
(warning (G_ "\
an error occurred while upgrading services on '~a':~%~{~s ~}~%")
host
(inferior-exception-arguments
c)))
os)
(install-bootloader (eval/error-handling c
(raise (formatted-message
(G_ "\
failed to install bootloader on '~a':~%~{~s ~}~%")
host
(inferior-exception-arguments c))))
bootloader-configuration bootcfg)))))))
;;;
@ -540,4 +572,6 @@ for environment of type '~a'")
;; Local Variables:
;; eval: (put 'remote-let 'scheme-indent-function 1)
;; eval: (put 'with-roll-back 'scheme-indent-function 1)
;; eval: (put 'eval/error-handling 'scheme-indent-function 1)
;; End: