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guix system: Add 'init' sub-command.

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* guix/scripts/system.scm (install): New procedure.
  (guix-system)[parse-option]: Remove check for extraneous arguments.
  [match-pair, option-arguments]: New procedures.
  Use 'option-arguments'.  Honor 'init'.
  (show-help): Document 'init'.
* doc/guix.texi (Invoking guix system): Document 'init'.
This commit is contained in:
Ludovic Courtès 2014-05-18 21:32:57 +02:00
parent bb31e0a3ee
commit 72b9d60df4
2 changed files with 93 additions and 9 deletions
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15
doc/guix.texi
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@ -3209,6 +3209,21 @@ Build the operating system's derivation, which includes all the
configuration files and programs needed to boot and run the system.
This action does not actually install anything.
@item init
Populate the given directory with all the files necessary to run the
operating system specified in @var{file}. This is useful for first-time
installations of the GNU system. For instance:
@example
guix system init my-os-config.scm /mnt
@end example
copies to @file{/mnt} all the store items required by the configuration
specified in @file{my-os-config.scm}. This includes configuration
files, packages, and so on. It also creates other essential files
needed for the system to operate correctly---e.g., the @file{/etc},
@file{/var}, and @file{/run} directories, and the @file{/bin/sh} file.
@item vm
@cindex virtual machine
Build a virtual machine that contain the operating system declared in

87
guix/scripts/system.scm
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@ -19,14 +19,18 @@
(define-module (guix scripts system)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module (guix gexp)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix utils)
#:use-module (guix monads)
#:use-module (guix scripts build)
#:use-module (guix build utils)
#:use-module (guix build install)
#:use-module (gnu system)
#:use-module (gnu system vm)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:export (guix-system
@ -64,6 +68,38 @@
(leave (_ "failed to load machine file '~a': ~s~%")
file args))))))
(define* (install store os-dir target
#:key (log-port (current-output-port)))
"Copy OS-DIR and its dependencies to directory TARGET. TARGET must be an
absolute directory name since that's what 'guix-register' expects."
(define to-copy
(let ((lst (delete-duplicates (cons os-dir (references store os-dir))
string=?)))
(topologically-sorted store lst)))
;; Copy items to the new store.
(for-each (lambda (item)
(let ((dest (string-append target item))
(refs (references store item)))
(format log-port "copying '~a'...~%" item)
(copy-recursively item dest
#:log (%make-void-port "w"))
;; Register ITEM; as a side-effect, it resets timestamps, etc.
(unless (register-path item
#:prefix target
#:references refs)
(leave (_ "failed to register '~a' under '~a'~%")
item target))))
to-copy)
;; Create a bunch of additional files.
(format log-port "populating '~a'...~%" target)
(populate-root-file-system target)
;; TODO: Install GRUB.
)
;;;
;;; Options.
@ -79,7 +115,9 @@ Build the operating system declared in FILE according to ACTION.\n"))
(display (_ "\
- 'vm', build a virtual machine image that shares the host's store\n"))
(display (_ "\
- 'vm-image', build a freestanding virtual machine image.\n"))
- 'vm-image', build a freestanding virtual machine image\n"))
(display (_ "\
- 'init', initialize a root file system to run GNU.\n"))
(show-build-options-help)
(display (_ "
@ -132,27 +170,50 @@ Build the operating system declared in FILE according to ACTION.\n"))
(leave (_ "~A: unrecognized option~%") name))
(lambda (arg result)
(if (assoc-ref result 'action)
(let ((previous (assoc-ref result 'argument)))
(if previous
(leave (_ "~a: extraneous argument~%") previous)
(alist-cons 'argument arg result)))
(alist-cons 'argument arg result)
(let ((action (string->symbol arg)))
(case action
((build vm vm-image)
((build vm vm-image init)
(alist-cons 'action action result))
(else (leave (_ "~a: unknown action~%")
action))))))
%default-options))
(define (match-pair car)
;; Return a procedure that matches a pair with CAR.
(match-lambda
((head . tail)
(and (eq? car head) tail))
(_ #f)))
(define (option-arguments opts)
;; Extract the plain arguments from OPTS.
(let* ((args (reverse (filter-map (match-pair 'argument) opts)))
(count (length args))
(action (assoc-ref opts 'action)))
(define (fail)
(leave (_ "wrong number of arguments for action '~a'~%")
action))
(case action
((build vm vm-image)
(unless (= count 1)
(fail)))
((init)
(unless (= count 2)
(fail))))
args))
(with-error-handling
(let* ((opts (parse-options))
(file (assoc-ref opts 'argument))
(args (option-arguments opts))
(file (first args))
(action (assoc-ref opts 'action))
(os (if file
(read-operating-system file)
(leave (_ "no configuration file specified~%"))))
(mdrv (case action
((build)
((build init)
(operating-system-derivation os))
((vm-image)
(let ((size (assoc-ref opts 'image-size)))
@ -171,4 +232,12 @@ Build the operating system declared in FILE according to ACTION.\n"))
(unless dry?
(build-derivations store (list drv))
(display (derivation->output-path drv))
(newline)))))
(newline)
(when (eq? action 'init)
(let ((target (second args)))
(format #t (_ "initializing operating system under '~a'...~%")
target)
(install store (derivation->output-path drv)
(canonicalize-path target))))))))