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services: Add 'system-provenance' procedure.

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* gnu/services.scm (sexp->channel, system-provenance): New procedures.
* guix/scripts/system.scm (sexp->channel): Remove.
(display-system-generation): Use 'system-provenance' instead of parsing
the "provenance" file right here.
This commit is contained in:
Ludovic Courtès 2020-07-14 15:50:38 +02:00
parent 0a72157271
commit b91a73a6a4
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GPG Key ID: 090B11993D9AEBB5
2 changed files with 46 additions and 35 deletions
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32
gnu/services.scm
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@ -89,6 +89,7 @@
system-service-type
provenance-service-type
system-provenance
boot-service-type
cleanup-service-type
activation-service-type
@ -423,6 +424,19 @@ be parsed by tools; it's potentially more future-proof than code."
(branch ,(channel-branch channel))
(commit ,(channel-commit channel))))
(define (sexp->channel sexp)
"Return the channel corresponding to SEXP, an sexp as found in the
\"provenance\" file produced by 'provenance-service-type'."
(match sexp
(('channel ('name name)
('url url)
('branch branch)
('commit commit)
rest ...)
;; XXX: In the future REST may include a channel introduction.
(channel (name name) (url url)
(branch branch) (commit commit)))))
(define (provenance-file channels config-file)
"Return a 'provenance' file describing CHANNELS, a list of channels, and
CONFIG-FILE, which can be either #f or a <local-file> containing the OS
@ -474,6 +488,24 @@ channels in use and CONFIG-FILE, if it is true."
itself: the channels used when building the system, and its configuration
file, when available.")))
(define (system-provenance system)
"Given SYSTEM, the file name of a system generation, return two values: the
list of channels SYSTEM is built from, and its configuration file. If that
information is missing, return the empty list (for channels) and possibly
#false (for the configuration file)."
(catch 'system-error
(lambda ()
(match (call-with-input-file (string-append system "/provenance")
read)
(('provenance ('version 0)
('channels channels ...)
('configuration-file config-file))
(values (map sexp->channel channels)
config-file))
(_
(values '() #f))))
(lambda _
(values '() #f))))
;;;
;;; Cleanup.

33
guix/scripts/system.scm
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@ -446,19 +446,6 @@ list of services."
;;; Generations.
;;;
(define (sexp->channel sexp)
"Return the channel corresponding to SEXP, an sexp as found in the
\"provenance\" file produced by 'provenance-service-type'."
(match sexp
(('channel ('name name)
('url url)
('branch branch)
('commit commit)
rest ...)
;; XXX: In the future REST may include a channel introduction.
(channel (name name) (url url)
(branch branch) (commit commit)))))
(define* (display-system-generation number
#:optional (profile %system-profile))
"Display a summary of system generation NUMBER in a human-readable format."
@ -482,13 +469,10 @@ list of services."
(uuid->string root)
root))
(kernel (boot-parameters-kernel params))
(multiboot-modules (boot-parameters-multiboot-modules params))
(provenance (catch 'system-error
(lambda ()
(call-with-input-file
(string-append generation "/provenance")
read))
(const #f))))
(multiboot-modules (boot-parameters-multiboot-modules params)))
(define-values (channels config-file)
(system-provenance generation))
(display-generation profile number)
(format #t (G_ " file name: ~a~%") generation)
(format #t (G_ " canonical file name: ~a~%") (readlink* generation))
@ -518,21 +502,16 @@ list of services."
(format #t (G_ " multiboot: ~a~%")
(string-join modules "\n "))))
(match provenance
(#f #t)
(('provenance ('version 0)
('channels channels ...)
('configuration-file config-file))
(unless (null? channels)
;; TRANSLATORS: Here "channel" is the same terminology as used in
;; "guix describe" and "guix pull --channels".
(format #t (G_ " channels:~%"))
(for-each display-channel (map sexp->channel channels)))
(for-each display-channel channels))
(when config-file
(format #t (G_ " configuration file: ~a~%")
(if (supports-hyperlinks?)
(file-hyperlink config-file)
config-file))))))))
config-file))))))
(define* (list-generations pattern #:optional (profile %system-profile))
"Display in a human-readable format all the system generations matching