serialization: Add 'fold-archive'.
* guix/serialization.scm (read-contents): Remove.
(read-file-type, fold-archive): New procedures.
(restore-file): Rewrite in terms of 'fold-archive'.
* tests/nar.scm ("write-file-tree + fold-archive")
("write-file-tree + fold-archive, flat file"): New tests.
This commit is contained in:
Ludovic Courtès
parent
55e21617d6
commit
12c1afcdbd
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@ -48,6 +48,7 @@
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write-file
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write-file-tree
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fold-archive
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restore-file))
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;;; Comment:
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@ -226,38 +227,25 @@ substitute invalid byte sequences with question marks. This is a
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(dump input output size))
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(write-padding size output))
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(define (read-contents in out)
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"Read the contents of a file from the Nar at IN, write it to OUT, and return
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the size in bytes."
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(define executable?
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(match (read-string in)
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("contents"
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#f)
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("executable"
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(match (list (read-string in) (read-string in))
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(("" "contents") #t)
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(x (raise
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(condition (&message
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(message "unexpected executable file marker"))
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(&nar-read-error (port in)
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(file #f)
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(token x))))))
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#t)
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(x
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(raise
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(condition (&message (message "unsupported nar file type"))
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(&nar-read-error (port in) (file #f) (token x)))))))
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(let ((size (read-long-long in)))
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;; Note: `sendfile' cannot be used here because of port buffering on IN.
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(dump in out size)
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(when executable?
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(chmod out #o755))
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(let ((m (modulo size 8)))
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(unless (zero? m)
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(get-bytevector-n* in (- 8 m))))
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size))
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(define (read-file-type port)
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"Read the file type tag from PORT, and return either 'regular or
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'executable."
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(match (read-string port)
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("contents"
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'regular)
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("executable"
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(match (list (read-string port) (read-string port))
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(("" "contents") 'executable)
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(x (raise
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(condition (&message
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(message "unexpected executable file marker"))
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(&nar-read-error (port port)
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(file #f)
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(token x)))))))
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(x
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(raise
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(condition (&message (message "unsupported nar file type"))
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(&nar-read-error (port port) (file #f) (token x)))))))
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(define %archive-version-1
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;; Magic cookie for Nix archives.
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@ -383,9 +371,14 @@ which case you can use 'identity'."
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(define port-conversion-strategy
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(fluid->parameter %default-port-conversion-strategy))
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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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Restore it as FILE."
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(define (fold-archive proc seed port file)
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"Read a file (possibly a directory structure) in Nar format from PORT. Call
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PROC on each file or directory read from PORT using:
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(PROC FILE TYPE CONTENTS RESULT)
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using SEED as the first RESULT. TYPE is a symbol like 'regular, and CONTENTS
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depends on TYPE."
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(parameterize ((currently-restored-file file)
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;; Error out if we can convert file names to the current
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@ -401,7 +394,8 @@ Restore it as FILE."
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(token signature)
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(file #f))))))
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(let restore ((file file))
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(let read ((file file)
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(result seed))
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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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@ -414,40 +408,49 @@ Restore it as 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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(read-eof-marker))
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(let* ((type (read-file-type port))
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(size (read-long-long port))
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;; The caller must read exactly SIZE bytes from PORT.
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(result (proc file type `(,port . ,size) result)))
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(let ((m (modulo size 8)))
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(unless (zero? m)
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(get-bytevector-n* port (- 8 m))))
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(read-eof-marker)
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result))
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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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(let ((result (proc file 'symlink target result)))
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(read-eof-marker)
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result))
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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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(let loop ((prefix (read-string port)))
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(let loop ((prefix (read-string port))
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(result (proc file 'directory #f result)))
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(match prefix
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("entry"
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(match (list (read-string port)
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(read-string port) (read-string port)
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(read-string port))
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(("(" "name" file "node")
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(restore (string-append dir "/" file))
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(match (read-string port)
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(")" #t)
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(x
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(raise
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(condition
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(&message
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(message "unexpected directory entry termination"))
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(&nar-read-error (port port)
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(file file)
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(token x))))))
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(loop (read-string port)))))
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(")" #t) ; done with DIR
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(let ((result (read (string-append dir "/" file) result)))
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(match (read-string port)
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(")" #f)
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(x
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(raise
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(condition
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(&message
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(message "unexpected directory entry termination"))
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(&nar-read-error (port port)
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(file file)
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(token x))))))
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(loop (read-string port) result)))))
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(")" result) ;done with DIR
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(x
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(raise
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(condition
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@ -459,6 +462,27 @@ Restore it as FILE."
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(&message (message "unsupported nar entry type"))
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(&nar-read-error (port port) (file file) (token x)))))))))
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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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Restore it as FILE."
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(fold-archive (lambda (file type content result)
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(match type
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('directory
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(mkdir file))
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('symlink
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(symlink content file))
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((or 'regular 'executable)
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(match content
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((input . size)
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(call-with-output-file file
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(lambda (output)
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(dump input output size)
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(when (eq? type 'executable)
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(chmod output #o755)))))))))
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#t
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port
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file))
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;;; Local Variables:
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;;; eval: (put 'call-with-binary-input-file 'scheme-indent-function 1)
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;;; End:
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@ -214,6 +214,80 @@
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(lambda ()
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(false-if-exception (rm-rf %test-dir))))))
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(test-equal "write-file-tree + fold-archive"
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'(("R" directory #f)
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("R/dir" directory #f)
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("R/dir/exe" executable "1234")
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("R/foo" regular "abcdefg")
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("R/lnk" symlink "foo"))
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(let ()
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(define-values (port get-bytevector)
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(open-bytevector-output-port))
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(write-file-tree "root" port
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#:file-type+size
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(match-lambda
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("root"
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(values 'directory 0))
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("root/foo"
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(values 'regular 7))
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("root/lnk"
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(values 'symlink 0))
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("root/dir"
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(values 'directory 0))
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("root/dir/exe"
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(values 'executable 4)))
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#:file-port
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(match-lambda
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("root/foo" (open-input-string "abcdefg"))
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("root/dir/exe" (open-input-string "1234")))
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#:symlink-target
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(match-lambda
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("root/lnk" "foo"))
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#:directory-entries
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(match-lambda
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("root" '("foo" "dir" "lnk"))
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("root/dir" '("exe"))))
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(close-port port)
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(reverse
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(fold-archive (lambda (file type contents result)
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(let ((contents (if (memq type '(regular executable))
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(utf8->string
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(get-bytevector-n (car contents)
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(cdr contents)))
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contents)))
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(cons `(,file ,type ,contents)
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result)))
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'()
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(open-bytevector-input-port (get-bytevector))
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"R"))))
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(test-equal "write-file-tree + fold-archive, flat file"
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'(("R" regular "abcdefg"))
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(let ()
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(define-values (port get-bytevector)
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(open-bytevector-output-port))
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(write-file-tree "root" port
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#:file-type+size
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(match-lambda
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("root" (values 'regular 7)))
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#:file-port
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(match-lambda
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("root" (open-input-string "abcdefg"))))
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(close-port port)
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(reverse
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(fold-archive (lambda (file type contents result)
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(let ((contents (utf8->string
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(get-bytevector-n (car contents)
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(cdr contents)))))
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(cons `(,file ,type ,contents) result)))
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'()
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(open-bytevector-input-port (get-bytevector))
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"R"))))
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(test-assert "write-file supports non-file output ports"
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(let ((input (string-append (dirname (search-path %load-path "guix.scm"))
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"/guix"))
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