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serialization: Add #:select? parameter to 'write-file'.

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* guix/serialization.scm (write-file): Add #:select? parameter and honor it.
* tests/nar.scm ("write-file #:select? + restore-file"): New test.
This commit is contained in:
Ludovic Courtès 2016-06-12 23:22:54 +02:00
parent 31d968fbcf
commit fe585be9aa
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GPG key ID: 090B11993D9AEBB5
2 changed files with 82 additions and 38 deletions
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78
guix/serialization.scm
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@ -256,53 +256,57 @@ (define %archive-version-1
;; Magic cookie for Nix archives. ;; Magic cookie for Nix archives.
"nix-archive-1") "nix-archive-1")
(define (write-file file port) (define* (write-file file port
#:key (select? (const #t)))
"Write the contents of FILE to PORT in Nar format, recursing into "Write the contents of FILE to PORT in Nar format, recursing into
sub-directories of FILE as needed." sub-directories of FILE as needed. For each directory entry, call (SELECT?
FILE STAT), where FILE is the entry's absolute file name and STAT is the
result of 'lstat'; exclude entries for which SELECT? does not return true."
(define p port) (define p port)
(write-string %archive-version-1 p) (write-string %archive-version-1 p)
(let dump ((f file)) (let dump ((f file) (s (lstat file)))
(let ((s (lstat f))) (write-string "(" p)
(write-string "(" p) (case (stat:type s)
(case (stat:type s) ((regular)
((regular) (write-string "type" p)
(write-string "type" p) (write-string "regular" p)
(write-string "regular" p) (if (not (zero? (logand (stat:mode s) #o100)))
(if (not (zero? (logand (stat:mode s) #o100))) (begin
(begin (write-string "executable" p)
(write-string "executable" p) (write-string "" p)))
(write-string "" p))) (write-contents f p (stat:size s)))
(write-contents f p (stat:size s))) ((directory)
((directory) (write-string "type" p)
(write-string "type" p) (write-string "directory" p)
(write-string "directory" p) (let ((entries
(let ((entries ;; 'scandir' defaults to 'string-locale<?' to sort files, but
;; 'scandir' defaults to 'string-locale<?' to sort files, but ;; this happens to be case-insensitive (at least in 'en_US'
;; this happens to be case-insensitive (at least in 'en_US' ;; locale on libc 2.18.) Conversely, we want files to be
;; locale on libc 2.18.) Conversely, we want files to be ;; sorted in a case-sensitive fashion.
;; sorted in a case-sensitive fashion. (scandir f (negate (cut member <> '("." ".."))) string<?)))
(scandir f (negate (cut member <> '("." ".."))) string<?))) (for-each (lambda (e)
(for-each (lambda (e) (let* ((f (string-append f "/" e))
(let ((f (string-append f "/" e))) (s (lstat f)))
(when (select? f s)
(write-string "entry" p) (write-string "entry" p)
(write-string "(" p) (write-string "(" p)
(write-string "name" p) (write-string "name" p)
(write-string e p) (write-string e p)
(write-string "node" p) (write-string "node" p)
(dump f) (dump f s)
(write-string ")" p))) (write-string ")" p))))
entries))) entries)))
((symlink) ((symlink)
(write-string "type" p) (write-string "type" p)
(write-string "symlink" p) (write-string "symlink" p)
(write-string "target" p) (write-string "target" p)
(write-string (readlink f) p)) (write-string (readlink f) p))
(else (else
(raise (condition (&message (message "unsupported file type")) (raise (condition (&message (message "unsupported file type"))
(&nar-error (file f) (port port)))))) (&nar-error (file f) (port port))))))
(write-string ")" p)))) (write-string ")" p)))
(define (restore-file port file) (define (restore-file port file)
"Read a file (possibly a directory structure) in Nar format from PORT. "Read a file (possibly a directory structure) in Nar format from PORT.

42
tests/nar.scm
View file

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; ;;;
;;; This file is part of GNU Guix. ;;; This file is part of GNU Guix.
;;; ;;;
@ -241,6 +241,46 @@ (define (touch file)
(lambda () (lambda ()
(rmdir input))))) (rmdir input)))))
(test-assert "write-file #:select? + restore-file"
(let ((input (string-append %test-dir ".input")))
(mkdir input)
(dynamic-wind
(const #t)
(lambda ()
(with-file-tree input
(directory "root"
((directory "a" (("x") ("y") ("z")))
("b") ("c") ("d" -> "b")))
(let* ((output %test-dir)
(nar (string-append output ".nar")))
(dynamic-wind
(lambda () #t)
(lambda ()
(call-with-output-file nar
(lambda (port)
(write-file input port
#:select?
(lambda (file stat)
(and (not (string=? (basename file)
"a"))
(not (eq? (stat:type stat)
'symlink)))))))
(call-with-input-file nar
(cut restore-file <> output))
;; Make sure "a" and "d" have been filtered out.
(and (not (file-exists? (string-append output "/root/a")))
(file=? (string-append output "/root/b")
(string-append input "/root/b"))
(file=? (string-append output "/root/c")
(string-append input "/root/c"))
(not (file-exists? (string-append output "/root/d")))))
(lambda ()
(false-if-exception (delete-file nar))
(false-if-exception (rm-rf output)))))))
(lambda ()
(rmdir input)))))
;; 'restore-file-set' depends on 'open-sha256-input-port', which in turn ;; 'restore-file-set' depends on 'open-sha256-input-port', which in turn
;; relies on a Guile 2.0.10+ feature. ;; relies on a Guile 2.0.10+ feature.
(test-skip (if (false-if-exception (test-skip (if (false-if-exception