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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2020-2022, 2024 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 (test-store-deduplication)
#:use-module (guix tests)
#:use-module (guix store deduplication)
#:use-module (gcrypt hash)
#:use-module ((guix utils) #:select (call-with-temporary-directory))
#:use-module (guix build utils)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-64))
(define (cartesian-product . lst)
"Return the Cartesian product of all the given lists."
(match lst
((head)
(map list head))
((head . rest)
(let ((others (apply cartesian-product rest)))
(append-map (lambda (init)
(map (lambda (lst)
(cons init lst))
others))
head)))
(()
'())))
(test-begin "store-deduplication")
(test-equal "deduplicate, below %deduplication-minimum-size"
(list #t (make-list 5 1))
(call-with-temporary-directory
(lambda (store)
;; Note: DATA must be longer than %DEDUPLICATION-MINIMUM-SIZE.
(let ((data "Hello, world!")
(identical (map (lambda (n)
(string-append store "/" (number->string n)
"/a/b/c"))
(iota 5))))
(for-each (lambda (file)
(mkdir-p (dirname file))
(call-with-output-file file
(lambda (port)
(put-bytevector port (string->utf8 data)))))
identical)
(deduplicate store (nar-sha256 store) #:store store)
;; (system (string-append "ls -lRia " store))
(list (= (length (delete-duplicates
(map (compose stat:ino stat) identical)))
(length identical))
(map (compose stat:nlink stat) identical))))))
(test-equal "deduplicate"
(cons* #t #f ;inode comparisons
2 (make-list 5 6)) ;'nlink' values
(call-with-temporary-directory
(lambda (store)
;; Note: DATA must be longer than %DEDUPLICATION-MINIMUM-SIZE.
(let ((data (string-concatenate (make-list 1000 "Hello, world!")))
(identical (map (lambda (n)
(string-append store "/" (number->string n)
"/a/b/c"))
(iota 5)))
(unique (string-append store "/unique")))
(for-each (lambda (file)
(mkdir-p (dirname file))
(call-with-output-file file
(lambda (port)
(put-bytevector port (string->utf8 data)))))
identical)
;; Make the parent of IDENTICAL read-only. This should not prevent
;; deduplication from inserting its hard link.
(chmod (dirname (second identical)) #o544)
(call-with-output-file unique
(lambda (port)
(put-bytevector port (string->utf8 (string-reverse data)))))
(deduplicate store (nar-sha256 store) #:store store)
;; (system (string-append "ls -lRia " store))
(cons* (apply = (map (compose stat:ino stat) identical))
(= (stat:ino (stat unique))
(stat:ino (stat (car identical))))
(stat:nlink (stat unique))
(map (compose stat:nlink stat) identical))))))
(test-equal "deduplicate, ENOSPC"
(cons* #f ;inode comparison
(append (make-list 3 4)
(make-list 7 1))) ;'nlink' values
;; In this scenario the first 3 files are properly deduplicated and then we
;; simulate a full '.links' directory where link(2) gets ENOSPC, thereby
;; preventing deduplication of the subsequent files.
(call-with-temporary-directory
(lambda (store)
(let ((true-link link)
(links 0)
(data1 (string->utf8
(string-concatenate (make-list 1000 "Hello, world!"))))
(data2 (string->utf8
(string-concatenate (make-list 1000 "Hi, world!"))))
(identical (map (lambda (n)
(string-append store "/" (number->string n)
"/a/b/c"))
(iota 10)))
(populate (lambda (data)
(lambda (file)
(mkdir-p (dirname file))
(call-with-output-file file
(lambda (port)
(put-bytevector port data)))))))
(for-each (populate data1) (take identical 5))
(for-each (populate data2) (drop identical 5))
(dynamic-wind
(lambda ()
(set! link (lambda (old new)
(set! links (+ links 1))
(if (<= links 4)
(true-link old new)
(throw 'system-error "link" "~A" '("Whaaat?!")
(list ENOSPC))))))
(lambda ()
(deduplicate store (nar-sha256 store) #:store store))
(lambda ()
(set! link true-link)))
(cons (apply = (map (compose stat:ino stat) identical))
(map (compose stat:nlink stat) identical))))))
(test-assert "copy-file/deduplicate, below %deduplication-minimum-size"
(call-with-temporary-directory
(lambda (store)
(let ((source (string-append store "/input")))
(call-with-output-file source
(lambda (port)
(display "Hello!\n" port)))
(copy-file/deduplicate source
(string-append store "/a")
#:store store)
(and (not (directory-exists? (string-append store "/.links")))
(file=? source (string-append store "/a"))
(not (= (stat:ino (stat (string-append store "/a")))
(stat:ino (stat source)))))))))
(test-assert "copy-file/deduplicate"
(call-with-temporary-directory
(lambda (store)
(let ((source (search-path %load-path "gnu/packages/emacs-xyz.scm")))
(for-each (lambda (target)
(copy-file/deduplicate source
(string-append store target)
#:store store))
'("/a" "/b" "/c"))
(and (directory-exists? (string-append store "/.links"))
(file=? source (string-append store "/a"))
(apply = (map (compose stat:ino stat
(cut string-append store <>))
'("/a" "/b" "/c"))))))))
(for-each (match-lambda
((initial-gap middle-gap final-gap)
(test-assert
(format #f "copy-file/deduplicate, sparse files (holes: ~a/~a/~a)"
initial-gap middle-gap final-gap)
(call-with-temporary-directory
(lambda (store)
(let ((source (string-append store "/source")))
(call-with-output-file source
(lambda (port)
(seek port initial-gap SEEK_CUR)
(display "hi!" port)
(seek port middle-gap SEEK_CUR)
(display "bye." port)
(when (> final-gap 0)
(seek port (- final-gap 1) SEEK_CUR)
(put-u8 port 0))))
(for-each (lambda (target)
(copy-file/deduplicate source
(string-append store target)
#:store store))
'("/a" "/b" "/c"))
(system* "du" "-h" source)
(system* "du" "-h" "--apparent-size" source)
(system* "du" "-h" (string-append store "/a"))
(system* "du" "-h" "--apparent-size" (string-append store "/a"))
(and (directory-exists? (string-append store "/.links"))
(file=? source (string-append store "/a"))
(apply = (map (compose stat:ino stat
(cut string-append store <>))
'("/a" "/b" "/c")))
(let ((st (pk 'S (stat (string-append store "/a")))))
(<= (* 512 (stat:blocks st))
(stat:size st))))))))))
(cartesian-product '(0 3333 8192)
'(8192 9999 16384 22222)
'(0 8192)))
(test-end "store-deduplication")
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