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guix system: Type-check the file or expression. 

Previously, users would get a wrong-type-arg exception down the road
with an intimidating backtrace.

* guix/scripts/system.scm (process-action)[ensure-operating-system]: New
procedure.
Use it.
This commit is contained in:
Ludovic Courtès 2019-05-15 22:36:46 +02:00
parent 6e633a510c
commit ce10e6053b
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1 changed files with 19 additions and 11 deletions
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30
guix/scripts/system.scm
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@ -1143,22 +1143,30 @@ Some ACTIONS support additional ARGS.\n"))
ACTION must be one of the sub-commands that takes an operating system
declaration as an argument (a file name.) OPTS is the raw alist of options
resulting from command-line parsing."
(define (ensure-operating-system file-or-exp obj)
(unless (operating-system? obj)
(leave (G_ "'~a' does not return an operating system~%")
file-or-exp))
obj)
(let* ((file (match args
(() #f)
((x . _) x)))
(expr (assoc-ref opts 'expression))
(system (assoc-ref opts 'system))
(os (cond
((and expr file)
(leave
(G_ "both file and expression cannot be specified~%")))
(expr
(read/eval expr))
(file
(load* file %user-module
#:on-error (assoc-ref opts 'on-error)))
(else
(leave (G_ "no configuration specified~%")))))
(os (ensure-operating-system
(or file expr)
(cond
((and expr file)
(leave
(G_ "both file and expression cannot be specified~%")))
(expr
(read/eval expr))
(file
(load* file %user-module
#:on-error (assoc-ref opts 'on-error)))
(else
(leave (G_ "no configuration specified~%"))))))
(dry? (assoc-ref opts 'dry-run?))
(bootloader? (assoc-ref opts 'install-bootloader?))