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+#!/bin/sh
+# aside from this initial boilerplate, this is actually -*- scheme -*- code
+
+prefix="@prefix@"
+datarootdir="@datarootdir@"
+
+GUILE_LOAD_COMPILED_PATH="@guilemoduledir@:$GUILE_LOAD_COMPILED_PATH"
+export GUILE_LOAD_COMPILED_PATH
+
+main='(module-ref (resolve-interface '\''(guix-gc)) '\'guix-gc')'
+exec ${GUILE-@GUILE@} -L "@guilemoduledir@" -l "$0" \
+ -c "(apply $main (cdr (command-line)))" "$@"
+!#
+;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
+;;; Copyright (C) 2012, 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; 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.
+;;;
+;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix-gc)
+ #:use-module (guix ui)
+ #:use-module (guix store)
+ #:use-module (ice-9 match)
+ #: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 (_ "
+ -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)
+ (_
+ (format (current-error-port) (_ "error: unknown unit: ~a~%")
+ unit)
+ (exit 1))))
+ (begin
+ (format (current-error-port)
+ (_ "error: invalid number: ~a") numstr)
+ (exit 1)))))
+
+(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)
+ (begin
+ (format (current-error-port)
+ (_ "error: invalid amount of storage: ~a~%")
+ arg)
+ (exit 1)))))
+ (#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))))))
+
+
+;;;
+;;; 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))
+
+ (setlocale LC_ALL "")
+ (textdomain "guix")
+ (setvbuf (current-output-port) _IOLBF)
+ (setvbuf (current-error-port) _IOLBF)
+
+ (with-error-handling
+ (let ((opts (parse-options))
+ (store (open-connection)))
+ (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)
+ (let ((paths (filter-map (match-lambda
+ (('argument . arg) arg)
+ (_ #f))
+ opts)))
+ (delete-paths store paths)))
+ ((list-dead)
+ (for-each (cut simple-format #t "~a~%" <>)
+ (dead-paths store)))
+ ((list-live)
+ (for-each (cut simple-format #t "~a~%" <>)
+ (live-paths store)))))))