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guix: offload: Add "status" sub-command. 

* guix/scripts/offload.scm (check-machine-status): New procedure.
(guix-offload): Call it when the argument is "status".
* doc/guix.texi (Daemon Offload Setup): Document it.
This commit is contained in:
Ricardo Wurmus 2017-12-13 23:42:40 +01:00
parent ca6182a1be
commit dafc3dafea
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9
doc/guix.texi
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@ -1066,6 +1066,15 @@ regular expression like this:
# guix offload test machines.scm '\.gnu\.org$'
@end example
@cindex offload status
To display the current load of all build hosts, run this command on the
main node:
@example
# guix offload status
@end example
@node Invoking guix-daemon
@section Invoking @command{guix-daemon}

39
guix/scripts/offload.scm
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@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This file is part of GNU Guix.
;;;
@ -629,6 +630,32 @@ machine."
(for-each assert-node-can-import nodes names sockets)
(for-each assert-node-can-export nodes names sockets))))
(define (check-machine-status machine-file pred)
"Print the load of each machine matching PRED in MACHINE-FILE."
(define (build-machine=? m1 m2)
(and (string=? (build-machine-name m1) (build-machine-name m2))
(= (build-machine-port m1) (build-machine-port m2))))
;; A given build machine may appear several times (e.g., once for
;; "x86_64-linux" and a second time for "i686-linux"); test them only once.
(let ((machines (filter pred
(delete-duplicates (build-machines machine-file)
build-machine=?))))
(info (G_ "getting status of ~a build machines defined in '~a'...~%")
(length machines) machine-file)
(for-each (lambda (machine)
(let* ((node (make-node (open-ssh-session machine)))
(uts (node-eval node '(uname))))
(format #t "~a~% kernel: ~a ~a~% architecture: ~a~%\
host name: ~a~% normalized load: ~a~%"
(build-machine-name machine)
(utsname:sysname uts) (utsname:release uts)
(utsname:machine uts)
(utsname:nodename uts)
(parameterize ((current-error-port (%make-void-port "rw+")))
(machine-load machine)))))
machines)))
;;;
;;; Entry point.
@ -691,6 +718,18 @@ machine."
(() (values %machine-file (const #t)))
(x (leave (G_ "wrong number of arguments~%"))))))
(check-machine-availability (or file %machine-file) pred))))
(("status" rest ...)
(with-error-handling
(let-values (((file pred)
(match rest
((file regexp)
(values file
(compose (cut string-match regexp <>)
build-machine-name)))
((file) (values file (const #t)))
(() (values %machine-file (const #t)))
(x (leave (G_ "wrong number of arguments~%"))))))
(check-machine-status (or file %machine-file) pred))))
(("--version")
(show-version-and-exit "guix offload"))
(("--help")