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7530e491b5
This avoids repeated (mkdir-p "/gnu/store/.links") calls when
deduplicating lots of files.
* guix/store/deduplication.scm (deduplicate): Remove initial call to
'mkdir-p'. Add ENOENT case in 'link' exception handler. Reindent.
* tests/store-deduplication.scm ("deduplicate, ENOSPC"): Check
for (<= links 4) to account for the initial 'link' call.
125 lines
5.1 KiB
Scheme
125 lines
5.1 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018, 2020 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 (test-store-deduplication)
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#:use-module (guix tests)
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#:use-module (guix store deduplication)
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#:use-module (gcrypt hash)
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#:use-module ((guix utils) #:select (call-with-temporary-directory))
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#:use-module (guix build utils)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 binary-ports)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-64))
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(test-begin "store-deduplication")
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(test-equal "deduplicate"
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(cons* #t #f ;inode comparisons
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2 (make-list 5 6)) ;'nlink' values
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(call-with-temporary-directory
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(lambda (store)
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(let ((data (string->utf8 "Hello, world!"))
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(identical (map (lambda (n)
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(string-append store "/" (number->string n)
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"/a/b/c"))
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(iota 5)))
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(unique (string-append store "/unique")))
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(for-each (lambda (file)
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(mkdir-p (dirname file))
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(call-with-output-file file
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(lambda (port)
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(put-bytevector port data))))
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identical)
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;; Make the parent of IDENTICAL read-only. This should not prevent
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;; deduplication from inserting its hard link.
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(chmod (dirname (second identical)) #o544)
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(call-with-output-file unique
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(lambda (port)
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(put-bytevector port (string->utf8 "This is unique."))))
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(deduplicate store (nar-sha256 store) #:store store)
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;; (system (string-append "ls -lRia " store))
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(cons* (apply = (map (compose stat:ino stat) identical))
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(= (stat:ino (stat unique))
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(stat:ino (stat (car identical))))
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(stat:nlink (stat unique))
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(map (compose stat:nlink stat) identical))))))
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(test-equal "deduplicate, ENOSPC"
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(cons* #f ;inode comparison
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(append (make-list 3 4)
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(make-list 7 1))) ;'nlink' values
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;; In this scenario the first 3 files are properly deduplicated and then we
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;; simulate a full '.links' directory where link(2) gets ENOSPC, thereby
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;; preventing deduplication of the subsequent files.
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(call-with-temporary-directory
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(lambda (store)
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(let ((true-link link)
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(links 0)
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(data1 (string->utf8 "Hello, world!"))
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(data2 (string->utf8 "Hi, world!"))
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(identical (map (lambda (n)
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(string-append store "/" (number->string n)
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"/a/b/c"))
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(iota 10)))
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(populate (lambda (data)
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(lambda (file)
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(mkdir-p (dirname file))
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(call-with-output-file file
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(lambda (port)
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(put-bytevector port data)))))))
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(for-each (populate data1) (take identical 5))
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(for-each (populate data2) (drop identical 5))
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(dynamic-wind
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(lambda ()
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(set! link (lambda (old new)
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(set! links (+ links 1))
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(if (<= links 4)
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(true-link old new)
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(throw 'system-error "link" "~A" '("Whaaat?!")
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(list ENOSPC))))))
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(lambda ()
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(deduplicate store (nar-sha256 store) #:store store))
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(lambda ()
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(set! link true-link)))
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(cons (apply = (map (compose stat:ino stat) identical))
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(map (compose stat:nlink stat) identical))))))
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(test-assert "copy-file/deduplicate"
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(call-with-temporary-directory
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(lambda (store)
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(let ((source (search-path %load-path "gnu/packages/emacs-xyz.scm")))
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(for-each (lambda (target)
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(copy-file/deduplicate source
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(string-append store target)
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#:store store))
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'("/a" "/b" "/c"))
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(and (directory-exists? (string-append store "/.links"))
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(file=? source (string-append store "/a"))
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(apply = (map (compose stat:ino stat
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(cut string-append store <>))
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'("/a" "/b" "/c"))))))))
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(test-end "store-deduplication")
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