;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2018, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2018, 2020-2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
(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)
- (let ((data (string->utf8 "Hello, world!"))
+ ;; 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"))
(mkdir-p (dirname file))
(call-with-output-file file
(lambda (port)
- (put-bytevector port data))))
+ (put-bytevector port (string->utf8 data)))))
identical)
;; Make the parent of IDENTICAL read-only. This should not prevent
;; deduplication from inserting its hard link.
(call-with-output-file unique
(lambda (port)
- (put-bytevector port (string->utf8 "This is unique."))))
+ (put-bytevector port (string->utf8 (string-reverse data)))))
(deduplicate store (nar-sha256 store) #:store store)
(lambda (store)
(let ((true-link link)
(links 0)
- (data1 (string->utf8 "Hello, world!"))
- (data2 (string->utf8 "Hi, world!"))
+ (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"))
(lambda ()
(set! link (lambda (old new)
(set! links (+ links 1))
- (if (<= links 3)
+ (if (<= links 4)
(true-link old new)
(throw 'system-error "link" "~A" '("Whaaat?!")
(list ENOSPC))))))