nar: Add support for symlinks.
* guix/nar.scm (write-file): Add case for type `symlink'.
(restore-file): Likewise.
* tests/nar.scm (random-file-size, make-file-tree, delete-file-tree,
with-file-tree, file-tree-equal?, make-random-bytevector,
populate-file): New procedures.
(%test-dir): New variable.
("write-file + restore-file"): Use `%test-dir' and `file-tree-equal?'.
("write-file + restore-file with symlinks"): New test.
This commit is contained in:
Ludovic Courtès
parent
a2011be5df
commit
8f3114b7a4
23
guix/nar.scm
23
guix/nar.scm
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@ -161,6 +161,11 @@ sub-directories of FILE as needed."
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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 "ENOSYS"))
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(&nar-error)))))
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@ -178,15 +183,27 @@ Restore it as FILE."
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(file #f))))))
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(let restore ((file file))
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(match (list (read-string port) (read-string port) (read-string port))
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(("(" "type" "regular")
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(call-with-output-file file (cut read-contents port <>))
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(define (read-eof-marker)
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(match (read-string port)
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(")" #t)
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(x (raise
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(condition
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(&message (message "invalid nar end-of-file marker"))
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(&nar-read-error (port port) (file file) (token x)))))))
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(match (list (read-string port) (read-string port) (read-string port))
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(("(" "type" "regular")
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(call-with-output-file file (cut read-contents port <>))
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(read-eof-marker))
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(("(" "type" "symlink")
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(match (list (read-string port) (read-string port))
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(("target" target)
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(symlink target file)
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(read-eof-marker))
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(x (raise
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(condition
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(&message (message "invalid symlink tokens"))
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(&nar-read-error (port port) (file file) (token x)))))))
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(("(" "type" "directory")
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(let ((dir file))
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(mkdir dir)
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183
tests/nar.scm
183
tests/nar.scm
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@ -22,43 +22,81 @@
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#:use-module (rnrs io ports)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-64)
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#:use-module (ice-9 ftw))
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 match))
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;; Test the (guix nar) module.
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(define (rm-rf dir)
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(file-system-fold (const #t) ; enter?
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(lambda (file stat result) ; leaf
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(delete-file file))
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(const #t) ; down
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(lambda (dir stat result) ; up
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(rmdir dir))
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(const #t) ; skip
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(const #t) ; error
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#t
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dir
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lstat))
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(test-begin "nar")
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;;;
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;;; File system testing tools, initially contributed to Guile, then libchop.
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;;;
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(test-assert "write-file + restore-file"
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(let* ((input (string-append (dirname (search-path %load-path "guix.scm"))
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"/guix"))
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(output (string-append (dirname input)
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"/test-nar-"
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(number->string (getpid))))
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(nar (string-append output ".nar")))
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(define (random-file-size)
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(define %average (* 1024 512)) ; 512 KiB
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(define %stddev (* 1024 64)) ; 64 KiB
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(inexact->exact
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(max 0 (round (+ %average (* %stddev (random:normal)))))))
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(define (make-file-tree dir tree)
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"Make file system TREE at DIR."
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(let loop ((dir dir)
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(tree tree))
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(define (scope file)
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(string-append dir "/" file))
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(match tree
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(('directory name (body ...))
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(mkdir (scope name))
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(for-each (cute loop (scope name) <>) body))
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(('directory name (? integer? mode) (body ...))
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(mkdir (scope name))
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(for-each (cute loop (scope name) <>) body)
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(chmod (scope name) mode))
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((file)
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(populate-file (scope file) (random-file-size)))
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((file (? integer? mode))
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(populate-file (scope file) (random-file-size))
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(chmod (scope file) mode))
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((from '-> to)
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(symlink to (scope from))))))
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(define (delete-file-tree dir tree)
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"Delete file TREE from DIR."
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(let loop ((dir dir)
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(tree tree))
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(define (scope file)
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(string-append dir "/" file))
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(match tree
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(('directory name (body ...))
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(for-each (cute loop (scope name) <>) body)
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(rmdir (scope name)))
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(('directory name (? integer? mode) (body ...))
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(chmod (scope name) #o755) ; make sure it can be entered
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(for-each (cute loop (scope name) <>) body)
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(rmdir (scope name)))
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((from '-> _)
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(delete-file (scope from)))
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((file _ ...)
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(delete-file (scope file))))))
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(define-syntax-rule (with-file-tree dir tree body ...)
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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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(cut write-file input <>))
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(call-with-input-file nar
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(cut restore-file <> output))
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(let* ((strip (cute string-drop <> (string-length input)))
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(sibling (compose (cut string-append output <>) strip))
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(file=? (lambda (a b)
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(make-file-tree dir 'tree))
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(lambda ()
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body ...)
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(lambda ()
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(delete-file-tree dir 'tree))))
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(define (file-tree-equal? input output)
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"Return #t if the file trees at INPUT and OUTPUT are equal."
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(define strip
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(cute string-drop <> (string-length input)))
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(define sibling
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(compose (cut string-append output <>) strip))
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(define (file=? a b)
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(and (eq? (stat:type (lstat a)) (stat:type (lstat b)))
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(case (stat:type (lstat a))
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((regular)
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@ -68,7 +106,8 @@
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((symlink)
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(string=? (readlink a) (readlink b)))
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(else
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(error "what?" (lstat a))))))))
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(error "what?" (lstat a))))))
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(file-system-fold (const #t)
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(lambda (name stat result) ; leaf
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(and result
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@ -83,13 +122,89 @@
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#f)
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(> (stat:nlink (stat output)) 2)
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input
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lstat)))
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lstat))
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(define (make-random-bytevector n)
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(let ((bv (make-bytevector n)))
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(let loop ((i 0))
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(if (< i n)
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(begin
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(bytevector-u8-set! bv i (random 256))
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(loop (1+ i)))
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bv))))
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(define (populate-file file size)
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(call-with-output-file file
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(lambda (p)
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(put-bytevector p (make-random-bytevector size)))))
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(define (rm-rf dir)
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(file-system-fold (const #t) ; enter?
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(lambda (file stat result) ; leaf
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(delete-file file))
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(const #t) ; down
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(lambda (dir stat result) ; up
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(rmdir dir))
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(const #t) ; skip
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(const #t) ; error
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#t
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dir
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lstat))
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(define %test-dir
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;; An output directory under $top_builddir.
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(string-append (dirname (search-path %load-path "configure"))
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"/test-nar-" (number->string (getpid))))
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(test-begin "nar")
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(test-assert "write-file + restore-file"
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(let* ((input (string-append (dirname (search-path %load-path "guix.scm"))
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"/guix"))
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(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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(cut write-file input <>))
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(call-with-input-file nar
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(cut restore-file <> output))
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(file-tree-equal? input output))
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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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))))
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(false-if-exception (rm-rf output))))))
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(test-assert "write-file + restore-file with symlinks"
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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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(("reg") ("exe" #o777) ("sym" -> "reg")))
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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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(cut write-file input <>))
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(call-with-input-file nar
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(cut restore-file <> output))
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(file-tree-equal? input output))
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(lambda ()
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(false-if-exception (delete-file nar)))))))
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(lambda ()
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(rmdir input)))))
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(test-end "nar")
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(exit (= (test-runner-fail-count (test-runner-current)) 0))
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;;; Local Variables:
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;;; eval: (put 'with-file-tree 'scheme-indent-function 2)
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;;; End:
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