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