serialization: Add #:select? parameter to 'write-file'.
* 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
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31d968fbcf
commit
fe585be9aa
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@ -256,53 +256,57 @@ the size in bytes."
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;; Magic cookie for Nix archives.
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"nix-archive-1")
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(define (write-file file port)
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(define* (write-file file port
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#:key (select? (const #t)))
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"Write the contents of FILE to PORT in Nar format, recursing into
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sub-directories of FILE as needed."
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sub-directories of FILE as needed. For each directory entry, call (SELECT?
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FILE STAT), where FILE is the entry's absolute file name and STAT is the
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result of 'lstat'; exclude entries for which SELECT? does not return true."
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(define p port)
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(write-string %archive-version-1 p)
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(let dump ((f file))
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(let ((s (lstat f)))
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(write-string "(" p)
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(case (stat:type s)
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((regular)
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(write-string "type" p)
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(write-string "regular" p)
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(if (not (zero? (logand (stat:mode s) #o100)))
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(begin
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(write-string "executable" p)
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(write-string "" p)))
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(write-contents f p (stat:size s)))
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((directory)
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(write-string "type" p)
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(write-string "directory" p)
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(let ((entries
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;; 'scandir' defaults to 'string-locale<?' to sort files, but
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;; this happens to be case-insensitive (at least in 'en_US'
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;; locale on libc 2.18.) Conversely, we want files to be
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;; sorted in a case-sensitive fashion.
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(scandir f (negate (cut member <> '("." ".."))) string<?)))
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(for-each (lambda (e)
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(let ((f (string-append f "/" e)))
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(let dump ((f file) (s (lstat file)))
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(write-string "(" p)
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(case (stat:type s)
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((regular)
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(write-string "type" p)
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(write-string "regular" p)
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(if (not (zero? (logand (stat:mode s) #o100)))
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(begin
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(write-string "executable" p)
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(write-string "" p)))
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(write-contents f p (stat:size s)))
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((directory)
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(write-string "type" p)
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(write-string "directory" p)
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(let ((entries
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;; 'scandir' defaults to 'string-locale<?' to sort files, but
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;; this happens to be case-insensitive (at least in 'en_US'
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;; locale on libc 2.18.) Conversely, we want files to be
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;; sorted in a case-sensitive fashion.
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(scandir f (negate (cut member <> '("." ".."))) string<?)))
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(for-each (lambda (e)
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(let* ((f (string-append f "/" e))
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(s (lstat f)))
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(when (select? f s)
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(write-string "entry" p)
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(write-string "(" p)
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(write-string "name" p)
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(write-string e p)
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(write-string "node" p)
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(dump f)
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(write-string ")" p)))
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entries)))
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((symlink)
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(write-string "type" p)
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(write-string "symlink" p)
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(write-string "target" p)
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(write-string (readlink f) p))
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(else
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(raise (condition (&message (message "unsupported file type"))
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(&nar-error (file f) (port port))))))
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(write-string ")" p))))
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(dump f s)
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(write-string ")" p))))
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entries)))
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((symlink)
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(write-string "type" p)
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(write-string "symlink" p)
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(write-string "target" p)
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(write-string (readlink f) p))
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(else
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(raise (condition (&message (message "unsupported file type"))
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(&nar-error (file f) (port port))))))
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(write-string ")" p)))
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(define (restore-file port file)
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"Read a file (possibly a directory structure) in Nar format from PORT.
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2012, 2013, 2014, 2015, 2016 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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@ -241,6 +241,46 @@
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(lambda ()
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(rmdir input)))))
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(test-assert "write-file #:select? + restore-file"
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(let ((input (string-append %test-dir ".input")))
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(mkdir input)
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(dynamic-wind
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(const #t)
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(lambda ()
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(with-file-tree input
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(directory "root"
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((directory "a" (("x") ("y") ("z")))
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("b") ("c") ("d" -> "b")))
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(let* ((output %test-dir)
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(nar (string-append output ".nar")))
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(dynamic-wind
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(lambda () #t)
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(lambda ()
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(call-with-output-file nar
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(lambda (port)
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(write-file input port
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#:select?
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(lambda (file stat)
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(and (not (string=? (basename file)
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"a"))
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(not (eq? (stat:type stat)
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'symlink)))))))
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(call-with-input-file nar
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(cut restore-file <> output))
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;; Make sure "a" and "d" have been filtered out.
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(and (not (file-exists? (string-append output "/root/a")))
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(file=? (string-append output "/root/b")
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(string-append input "/root/b"))
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(file=? (string-append output "/root/c")
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(string-append input "/root/c"))
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(not (file-exists? (string-append output "/root/d")))))
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(lambda ()
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(false-if-exception (delete-file nar))
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(false-if-exception (rm-rf output)))))))
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(lambda ()
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(rmdir input)))))
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;; 'restore-file-set' depends on 'open-sha256-input-port', which in turn
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;; relies on a Guile 2.0.10+ feature.
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(test-skip (if (false-if-exception
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