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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix scripts gc)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:export (guix-gc))
;;;
;;; Command-line options.
;;;
(define %default-options
;; Alist of default option values.
`((action . collect-garbage)))
(define (show-help)
(display (_ "Usage: guix gc [OPTION]... PATHS...
Invoke the garbage collector.\n"))
(display (_ "
-C, --collect-garbage[=MIN]
collect at least MIN bytes of garbage"))
(display (_ "
-d, --delete attempt to delete PATHS"))
(display (_ "
--list-dead list dead paths"))
(display (_ "
--list-live list live paths"))
(newline)
(display (_ "
--references list the references of PATHS"))
(display (_ "
--referrers list the referrers of PATHS"))
(newline)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define (size->number str)
"Convert STR, a storage measurement representation such as \"1024\" or
\"1MiB\", to a number of bytes. Raise an error if STR could not be
interpreted."
(define unit-pos
(string-rindex str char-set:digit))
(define unit
(and unit-pos (substring str (+ 1 unit-pos))))
(let* ((numstr (if unit-pos
(substring str 0 (+ 1 unit-pos))
str))
(num (string->number numstr)))
(if num
(* num
(match unit
("KiB" (expt 2 10))
("MiB" (expt 2 20))
("GiB" (expt 2 30))
("TiB" (expt 2 40))
("KB" (expt 10 3))
("MB" (expt 10 6))
("GB" (expt 10 9))
("TB" (expt 10 12))
("" 1)
(_
(leave (_ "error: unknown unit: ~a~%") unit)
(exit 1))))
(leave (_ "error: invalid number: ~a") numstr))))
(define %options
;; Specification of the command-line options.
(list (option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix gc")))
(option '(#\C "collect-garbage") #f #t
(lambda (opt name arg result)
(let ((result (alist-cons 'action 'collect-garbage
(alist-delete 'action result))))
(match arg
((? string?)
(let ((amount (size->number arg)))
(if arg
(alist-cons 'min-freed amount result)
(leave (_ "error: invalid amount of storage: ~a~%")
arg))))
(#f result)))))
(option '(#\d "delete") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'delete
(alist-delete 'action result))))
(option '("list-dead") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'list-dead
(alist-delete 'action result))))
(option '("list-live") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'list-live
(alist-delete 'action result))))
(option '("references") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'list-references
(alist-delete 'action result))))
(option '("referrers") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'list-referrers
(alist-delete 'action result))))))
;;;
;;; Entry point.
;;;
(define (guix-gc . args)
(define (parse-options)
;; Return the alist of option values.
(args-fold args %options
(lambda (opt name arg result)
(leave (_ "~A: unrecognized option~%") name))
(lambda (arg result)
(alist-cons 'argument arg result))
%default-options))
(define (symlink-target file)
(let ((s (false-if-exception (lstat file))))
(if (and s (eq? 'symlink (stat:type s)))
(symlink-target (readlink file))
file)))
(define (store-directory file)
;; Return the store directory that holds FILE if it's in the store,
;; otherwise return FILE.
(or (and=> (string-match (string-append "^" (regexp-quote (%store-prefix))
"/([^/]+)")
file)
(compose (cut string-append (%store-prefix) "/" <>)
(cut match:substring <> 1)))
file))
(with-error-handling
(let* ((opts (parse-options))
(store (open-connection))
(paths (filter-map (match-lambda
(('argument . arg) arg)
(_ #f))
opts)))
(define (list-relatives relatives)
(for-each (compose (lambda (path)
(for-each (cut simple-format #t "~a~%" <>)
(relatives store path)))
store-directory
symlink-target)
paths))
(case (assoc-ref opts 'action)
((collect-garbage)
(let ((min-freed (assoc-ref opts 'min-freed)))
(if min-freed
(collect-garbage store min-freed)
(collect-garbage store))))
((delete)
(delete-paths store paths))
((list-references)
(list-relatives references))
((list-referrers)
(list-relatives referrers))
((list-dead)
(for-each (cut simple-format #t "~a~%" <>)
(dead-paths store)))
((list-live)
(for-each (cut simple-format #t "~a~%" <>)
(live-paths store)))))))
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