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-rw-r--r--gnu/build/file-systems.scm88
1 files changed, 67 insertions, 21 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index fe98df95d5..47aa77dd3e 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016, 2017 David Craven <david@craven.ch>
+;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -47,12 +48,7 @@
mount-flags->bit-mask
check-file-system
- mount-file-system)
- #:re-export (mount
- umount
- MS_BIND
- MS_MOVE
- MS_RDONLY))
+ mount-file-system))
;;; Commentary:
;;;
@@ -61,13 +57,6 @@
;;;
;;; Code:
-;; 'mount' is already defined in the statically linked Guile used for initial
-;; RAM disks, in which case the bindings in (guix build syscalls) do not work
-;; (the FFI bindings do not work there). Override them in that case.
-(when (module-defined? the-scm-module 'mount)
- (set! mount (@ (guile) mount))
- (set! umount (@ (guile) umount)))
-
(define (bind-mount source target)
"Bind-mount SOURCE at TARGET."
(mount source target "" MS_BIND))
@@ -241,6 +230,63 @@ Trailing spaces are trimmed."
;;;
+;;; ISO9660 file systems.
+;;;
+
+;; <http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-119.pdf>.
+
+(define (iso9660-superblock? sblock)
+ "Return #t when SBLOCK is a iso9660 superblock."
+ (bytevector=? (sub-bytevector sblock 1 6)
+ ;; Note: "\x01" is the volume descriptor format version
+ (string->utf8 "CD001\x01")))
+
+(define (read-iso9660-primary-volume-descriptor device offset)
+ "Find and read the first primary volume descriptor, starting at OFFSET.
+ Return #f if not found."
+ (let* ((sblock (read-superblock device offset 2048 iso9660-superblock?))
+ (type-code (if sblock (array-ref sblock 0) 255)))
+ (match type-code
+ (255 #f) ; Volume Descriptor Set Terminator.
+ (1 sblock) ; Primary Volume Descriptor
+ (_ (read-iso9660-primary-volume-descriptor device (+ offset 2048))))))
+
+(define (read-iso9660-superblock device)
+ "Return the raw contents of DEVICE's iso9660 superblock as a bytevector, or
+#f if DEVICE does not contain a iso9660 file system."
+ ;; Start reading at sector 16.
+ (read-iso9660-primary-volume-descriptor device (* 2048 16)))
+
+(define (iso9660-superblock-uuid sblock)
+ "Return the modification time of a iso9660 superblock SBLOCK as a bytevector."
+ ;; Drops GMT offset for compatibility with Grub, blkid and /dev/disk/by-uuid.
+ ;; Compare Grub: "2014-12-02-19-30-23-00".
+ ;; Compare blkid result: "2014-12-02-19-30-23-00".
+ ;; Compare /dev/disk/by-uuid entry: "2014-12-02-19-30-23-00".
+ (sub-bytevector sblock 830 16))
+
+(define (iso9660-uuid->string uuid)
+ "Given an UUID bytevector, return its timestamp string."
+ (define (digits->string bytes)
+ (latin1->string bytes (lambda (c) #f)))
+ (let* ((year (sub-bytevector uuid 0 4))
+ (month (sub-bytevector uuid 4 2))
+ (day (sub-bytevector uuid 6 2))
+ (hour (sub-bytevector uuid 8 2))
+ (minute (sub-bytevector uuid 10 2))
+ (second (sub-bytevector uuid 12 2))
+ (hundredths (sub-bytevector uuid 14 2))
+ (parts (list year month day hour minute second hundredths)))
+ (string-append (string-join (map digits->string parts)))))
+
+(define (iso9660-superblock-volume-name sblock)
+ "Return the volume name of SBLOCK as a string. The volume name is an ASCII
+string. Trailing spaces are trimmed."
+ (string-trim-right (latin1->string (sub-bytevector sblock 40 32)
+ (lambda (c) #f)) #\space))
+
+
+;;;
;;; LUKS encrypted devices.
;;;
@@ -351,7 +397,9 @@ partition field reader that returned a value."
(_ #f)))
(define %partition-label-readers
- (list (partition-field-reader read-ext2-superblock
+ (list (partition-field-reader read-iso9660-superblock
+ iso9660-superblock-volume-name)
+ (partition-field-reader read-ext2-superblock
ext2-superblock-volume-name)
(partition-field-reader read-btrfs-superblock
btrfs-superblock-volume-name)
@@ -359,7 +407,9 @@ partition field reader that returned a value."
fat32-superblock-volume-name)))
(define %partition-uuid-readers
- (list (partition-field-reader read-ext2-superblock
+ (list (partition-field-reader read-iso9660-superblock
+ iso9660-superblock-uuid)
+ (partition-field-reader read-ext2-superblock
ext2-superblock-uuid)
(partition-field-reader read-btrfs-superblock
btrfs-superblock-uuid)
@@ -576,10 +626,6 @@ corresponds to the symbols listed in FLAGS."
(()
0))))
-(define (regular-file? file-name)
- "Return #t if FILE-NAME is a regular file."
- (eq? (stat:type (stat file-name)) 'regular))
-
(define* (mount-file-system spec #:key (root "/root"))
"Mount the file system described by SPEC under ROOT. SPEC must have the
form:
@@ -619,9 +665,9 @@ run a file system check."
(check-file-system source type))
;; Create the mount point. Most of the time this is a directory, but
- ;; in the case of a bind mount, a regular file may be needed.
+ ;; in the case of a bind mount, a regular file or socket may be needed.
(if (and (= MS_BIND (logand flags MS_BIND))
- (regular-file? source))
+ (not (file-is-directory? source)))
(unless (file-exists? mount-point)
(mkdir-p (dirname mount-point))
(call-with-output-file mount-point (const #t)))