103 lines
3.7 KiB
Scheme
103 lines
3.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2013, 2014, 2017 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 build store-copy)
|
|
#:use-module (guix build utils)
|
|
#:use-module (srfi srfi-1)
|
|
#:use-module (ice-9 rdelim)
|
|
#:use-module (ice-9 ftw)
|
|
#:export (read-reference-graph
|
|
closure-size
|
|
populate-store))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; This module provides the tools to copy store items and their dependencies
|
|
;;; to another store. It relies on the availability of "reference graph"
|
|
;;; files as produced by 'gexp->derivation' et al. with the
|
|
;;; #:references-graphs parameter.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define (read-reference-graph port)
|
|
"Return a list of store paths from the reference graph at PORT.
|
|
The data at PORT is the format produced by #:references-graphs."
|
|
(let loop ((line (read-line port))
|
|
(result '()))
|
|
(cond ((eof-object? line)
|
|
(delete-duplicates result))
|
|
((string-prefix? "/" line)
|
|
(loop (read-line port)
|
|
(cons line result)))
|
|
(else
|
|
(loop (read-line port)
|
|
result)))))
|
|
|
|
(define (file-size file)
|
|
"Return the size of bytes of FILE, entering it if FILE is a directory."
|
|
(file-system-fold (const #t)
|
|
(lambda (file stat result) ;leaf
|
|
(+ (stat:size stat) result))
|
|
(lambda (directory stat result) ;down
|
|
(+ (stat:size stat) result))
|
|
(lambda (directory stat result) ;up
|
|
result)
|
|
(lambda (file stat result) ;skip
|
|
result)
|
|
(lambda (file stat errno result)
|
|
(format (current-error-port)
|
|
"file-size: ~a: ~a~%" file
|
|
(strerror errno))
|
|
result)
|
|
0
|
|
file
|
|
lstat))
|
|
|
|
(define (closure-size reference-graphs)
|
|
"Return an estimate of the size of the closure described by
|
|
REFERENCE-GRAPHS, a list of reference-graph files."
|
|
(define (graph-from-file file)
|
|
(call-with-input-file file read-reference-graph))
|
|
|
|
(define items
|
|
(delete-duplicates (append-map graph-from-file reference-graphs)))
|
|
|
|
(reduce + 0 (map file-size items)))
|
|
|
|
(define* (populate-store reference-graphs target)
|
|
"Populate the store under directory TARGET with the items specified in
|
|
REFERENCE-GRAPHS, a list of reference-graph files."
|
|
(define store
|
|
(string-append target (%store-directory)))
|
|
|
|
(define (things-to-copy)
|
|
;; Return the list of store files to copy to the image.
|
|
(define (graph-from-file file)
|
|
(call-with-input-file file read-reference-graph))
|
|
|
|
(delete-duplicates (append-map graph-from-file reference-graphs)))
|
|
|
|
(mkdir-p store)
|
|
(chmod store #o1775)
|
|
(for-each (lambda (thing)
|
|
(copy-recursively thing
|
|
(string-append target thing)))
|
|
(things-to-copy)))
|
|
|
|
;;; store-copy.scm ends here
|