273 lines
11 KiB
Scheme
273 lines
11 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2015, 2016, 2017, 2018 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 scripts)
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#:use-module (guix store)
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#:autoload (guix build syscalls) (free-disk-space)
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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-11)
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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 (G_ "Usage: guix gc [OPTION]... PATHS...
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Invoke the garbage collector.\n"))
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(display (G_ "
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-C, --collect-garbage[=MIN]
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collect at least MIN bytes of garbage"))
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(display (G_ "
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-F, --free-space=FREE attempt to reach FREE available space in the store"))
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(display (G_ "
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-d, --delete attempt to delete PATHS"))
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(display (G_ "
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--optimize optimize the store by deduplicating identical files"))
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(display (G_ "
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--list-dead list dead paths"))
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(display (G_ "
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--list-live list live paths"))
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(newline)
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(display (G_ "
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--references list the references of PATHS"))
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(display (G_ "
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-R, --requisites list the requisites of PATHS"))
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(display (G_ "
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--referrers list the referrers of PATHS"))
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(display (G_ "
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--derivers list the derivers of PATHS"))
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(newline)
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(display (G_ "
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--verify[=OPTS] verify the integrity of the store; OPTS is a
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comma-separated combination of 'repair' and
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'contents'"))
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(display (G_ "
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--list-failures list cached build failures"))
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(display (G_ "
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--clear-failures remove PATHS from the set of cached failures"))
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(newline)
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(display (G_ "
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-h, --help display this help and exit"))
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(display (G_ "
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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 argument->verify-options
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(let ((not-comma (char-set-complement (char-set #\,)))
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(validate (lambda (option)
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(unless (memq option '(repair contents))
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(leave (G_ "~a: invalid '--verify' option~%")
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option)))))
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(lambda (arg)
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"Turn ARG into a list of symbols denoting '--verify' options."
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(if arg
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(let ((lst (map string->symbol
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(string-tokenize arg not-comma))))
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(for-each validate lst)
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lst)
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'()))))
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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 (G_ "invalid amount of storage: ~a~%")
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arg))))
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(#f result)))))
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(option '(#\F "free-space") #t #f
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(lambda (opt name arg result)
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(alist-cons 'free-space (size->number arg) 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 '("optimize") #f #f
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(lambda (opt name arg result)
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(alist-cons 'action 'optimize
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(alist-delete 'action result))))
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(option '("verify") #f #t
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(lambda (opt name arg result)
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(let ((options (argument->verify-options arg)))
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(alist-cons 'action 'verify
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(alist-cons 'verify-options options
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(alist-delete 'action
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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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(option '("derivers") #f #f
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(lambda (opt name arg result)
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(alist-cons 'action 'list-derivers
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(alist-delete 'action result))))
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(option '("list-failures") #f #f
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(lambda (opt name arg result)
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(alist-cons 'action 'list-failures
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(alist-delete 'action result))))
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(option '("clear-failures") #f #f
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(lambda (opt name arg result)
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(alist-cons 'action 'clear-failures
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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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(parse-command-line args %options (list %default-options)
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#:build-options? #f))
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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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(define (ensure-free-space store space)
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;; Attempt to have at least SPACE bytes available in STORE.
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(let ((free (free-disk-space (%store-prefix))))
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(if (> free space)
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(info (G_ "already ~h MiBs available on ~a, nothing to do~%")
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(/ free 1024. 1024.) (%store-prefix))
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(let ((to-free (- space free)))
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(info (G_ "freeing ~h MiBs~%") (/ to-free 1024. 1024.))
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(collect-garbage store to-free)))))
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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 (assert-no-extra-arguments)
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(unless (null? paths)
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(leave (G_ "extraneous arguments: ~{~a ~}~%") paths)))
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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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(assert-no-extra-arguments)
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(let ((min-freed (assoc-ref opts 'min-freed))
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(free-space (assoc-ref opts 'free-space)))
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(cond
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(free-space
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(ensure-free-space store free-space))
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(min-freed
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(let-values (((paths freed) (collect-garbage store min-freed)))
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(info (G_ "freed ~h MiBs~%") (/ freed 1024. 1024.))))
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(else
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(let-values (((paths freed) (collect-garbage store)))
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(info (G_ "freed ~h MiBs~%") (/ freed 1024. 1024.)))))))
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((delete)
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(delete-paths store (map direct-store-path 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 (lambda (store item)
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(requisites store (list item)))))
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((list-referrers)
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(list-relatives referrers))
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((list-derivers)
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(list-relatives valid-derivers))
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((optimize)
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(assert-no-extra-arguments)
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(optimize-store store))
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((verify)
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(assert-no-extra-arguments)
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(let ((options (assoc-ref opts 'verify-options)))
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(exit
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(verify-store store
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#:check-contents? (memq 'contents options)
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#:repair? (memq 'repair options)))))
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((list-failures)
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(for-each (cut simple-format #t "~a~%" <>)
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(query-failed-paths store)))
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((clear-failures)
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(clear-failed-paths store (map direct-store-path paths)))
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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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