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file-systems: Introduce (gnu system uuid). 

* gnu/build/file-systems.scm (sub-bytevector)
(latin1->string, %fat32-endianness, fat32-uuid->string)
(%iso9660-uuid-rx, string->iso9660-uuid)
(iso9660-uuid->string, %network-byte-order)
(dce-uuid->string, %uuid-rx, string->dce-uuid)
(string->ext2-uuid, string->ext3-uuid, string->ext4-uuid)
(vhashq, %uuid-parsers, %uuid-printers, string->uuid)
(uuid->string): Move to...
* gnu/system/uuid.scm: ... here.  New file.
* gnu/system/file-systems.scm (uuid): Move to the above file.
* gnu/system/vm.scm: Adjust accordingly.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add uuid.scm.
master
Ludovic Courtès 2017-09-05 21:51:12 +02:00
parent 943e1b975f
commit 47cef4ecad
No known key found for this signature in database
GPG Key ID: 090B11993D9AEBB5
5 changed files with 234 additions and 185 deletions
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167
gnu/build/file-systems.scm
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@ -19,6 +19,7 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu build file-systems)
#:use-module (gnu system uuid)
#:use-module (guix build utils)
#:use-module (guix build bournish)
#:use-module (guix build syscalls)
@ -26,9 +27,6 @@
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 format)
#:use-module (ice-9 regex)
#:use-module (ice-9 vlist)
#:use-module (system foreign)
#:autoload (system repl repl) (start-repl)
#:use-module (srfi srfi-1)
@ -42,17 +40,6 @@
find-partition-by-luks-uuid
canonicalize-device-spec
uuid->string
dce-uuid->string
string->uuid
string->dce-uuid
string->iso9660-uuid
string->ext2-uuid
string->ext3-uuid
string->ext4-uuid
string->btrfs-uuid
iso9660-uuid->string
bind-mount
mount-flags->bit-mask
@ -98,20 +85,6 @@ takes a bytevector and returns #t when it's a valid superblock."
(and (magic? block)
block)))))))))
(define (sub-bytevector bv start size)
"Return a copy of the SIZE bytes of BV starting from offset START."
(let ((result (make-bytevector size)))
(bytevector-copy! bv start result 0 size)
result))
(define (latin1->string bv terminator)
"Return a string of BV, a latin1 bytevector, or #f. TERMINATOR is a predicate
that takes a number and returns #t when a termination character is found."
(let ((bytes (take-while (negate terminator) (bytevector->u8-list bv))))
(if (null? bytes)
#f
(list->string (map integer->char bytes)))))
(define null-terminated-latin1->string
(cut latin1->string <> zero?))
@ -199,10 +172,6 @@ if DEVICE does not contain a btrfs file system."
;; <http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-107.pdf>.
(define-syntax %fat32-endianness
;; Endianness of fat file systems.
(identifier-syntax (endianness little)))
(define (fat32-superblock? sblock)
"Return #t when SBLOCK is a fat32 superblock."
(bytevector=? (sub-bytevector sblock 82 8)
@ -217,12 +186,6 @@ if DEVICE does not contain a btrfs file system."
"Return the Volume ID of a fat superblock SBLOCK as a 4-byte bytevector."
(sub-bytevector sblock 67 4))
(define (fat32-uuid->string uuid)
"Convert fat32 UUID, a 4-byte bytevector, to its string representation."
(let ((high (bytevector-uint-ref uuid 0 %fat32-endianness 2))
(low (bytevector-uint-ref uuid 2 %fat32-endianness 2)))
(format #f "~:@(~x-~x~)" low high)))
(define (fat32-superblock-volume-name sblock)
"Return the volume name of SBLOCK as a string of at most 11 characters, or
#f if SBLOCK has no volume name. The volume name is a latin1 string.
@ -244,27 +207,6 @@ Trailing spaces are trimmed."
;; <http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-119.pdf>.
(define %iso9660-uuid-rx
;; Y m d H M S ss
(make-regexp "^([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})$"))
(define (string->iso9660-uuid str)
"Parse STR as a ISO9660 UUID (which is really a timestamp - see /dev/disk/by-uuid).
Return its contents as a 16-byte bytevector. Return #f if STR is not a valid
ISO9660 UUID representation."
(and=> (regexp-exec %iso9660-uuid-rx str)
(lambda (match)
(letrec-syntax ((match-numerals
(syntax-rules ()
((_ index (name rest ...) body)
(let ((name (match:substring match index)))
(match-numerals (+ 1 index) (rest ...) body)))
((_ index () body)
body))))
(match-numerals 1 (year month day hour minute second hundredths)
(string->utf8 (string-append year month day
hour minute second hundredths)))))))
(define (iso9660-superblock? sblock)
"Return #t when SBLOCK is an iso9660 volume descriptor."
(bytevector=? (sub-bytevector sblock 1 6)
@ -311,20 +253,6 @@ SBLOCK as a bytevector. If that's not set, returns the creation time."
modification-time)))
(sub-bytevector time 0 16))) ; strips GMT offset.
(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."
@ -511,99 +439,6 @@ were found."
(define find-partition-by-luks-uuid
(find-partition luks-partition-uuid-predicate))
;;;
;;; UUIDs.
;;;
(define-syntax %network-byte-order
(identifier-syntax (endianness big)))
(define (dce-uuid->string uuid)
"Convert UUID, a 16-byte bytevector, to its string representation, something
like \"6b700d61-5550-48a1-874c-a3d86998990e\"."
;; See <https://tools.ietf.org/html/rfc4122>.
(let ((time-low (bytevector-uint-ref uuid 0 %network-byte-order 4))
(time-mid (bytevector-uint-ref uuid 4 %network-byte-order 2))
(time-hi (bytevector-uint-ref uuid 6 %network-byte-order 2))
(clock-seq (bytevector-uint-ref uuid 8 %network-byte-order 2))
(node (bytevector-uint-ref uuid 10 %network-byte-order 6)))
(format #f "~8,'0x-~4,'0x-~4,'0x-~4,'0x-~12,'0x"
time-low time-mid time-hi clock-seq node)))
(define %uuid-rx
;; The regexp of a UUID.
(make-regexp "^([[:xdigit:]]{8})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{12})$"))
(define (string->dce-uuid str)
"Parse STR as a DCE UUID (see <https://tools.ietf.org/html/rfc4122>) and
return its contents as a 16-byte bytevector. Return #f if STR is not a valid
UUID representation."
(and=> (regexp-exec %uuid-rx str)
(lambda (match)
(letrec-syntax ((hex->number
(syntax-rules ()
((_ index)
(string->number (match:substring match index)
16))))
(put!
(syntax-rules ()
((_ bv index (number len) rest ...)
(begin
(bytevector-uint-set! bv index number
(endianness big) len)
(put! bv (+ index len) rest ...)))
((_ bv index)
bv))))
(let ((time-low (hex->number 1))
(time-mid (hex->number 2))
(time-hi (hex->number 3))
(clock-seq (hex->number 4))
(node (hex->number 5))
(uuid (make-bytevector 16)))
(put! uuid 0
(time-low 4) (time-mid 2) (time-hi 2)
(clock-seq 2) (node 6)))))))
(define string->ext2-uuid string->dce-uuid)
(define string->ext3-uuid string->dce-uuid)
(define string->ext4-uuid string->dce-uuid)
(define string->btrfs-uuid string->dce-uuid)
(define-syntax vhashq
(syntax-rules (=>)
((_)
vlist-null)
((_ (key others ... => value) rest ...)
(vhash-consq key value
(vhashq (others ... => value) rest ...)))
((_ (=> value) rest ...)
(vhashq rest ...))))
(define %uuid-parsers
(vhashq
('dce 'ext2 'ext3 'ext4 'btrfs 'luks => string->dce-uuid)
('iso9660 => string->iso9660-uuid)))
(define %uuid-printers
(vhashq
('dce 'ext2 'ext3 'ext4 'btrfs 'luks => dce-uuid->string)
('iso9660 => iso9660-uuid->string)
('fat32 'fat => fat32-uuid->string)))
(define* (string->uuid str #:key (type 'dce))
"Parse STR as a UUID of the given TYPE. On success, return the
corresponding bytevector; otherwise return #f."
(match (vhash-assq type %uuid-parsers)
(#f #f)
((_ . (? procedure? parse)) (parse str))))
(define* (uuid->string bv #:key (type 'dce))
"Convert BV, a bytevector, to the UUID string representation for TYPE."
(match (vhash-assq type %uuid-printers)
(#f #f)
((_ . (? procedure? unparse)) (unparse bv))))
(define* (canonicalize-device-spec spec #:optional (title 'any))
"Return the device name corresponding to SPEC. TITLE is a symbol, one of

2
gnu/build/vm.scm
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@ -26,7 +26,7 @@
#:use-module (guix build syscalls)
#:use-module (gnu build linux-boot)
#:use-module (gnu build install)
#:use-module (gnu build file-systems)
#:use-module (gnu system uuid)
#:use-module (guix records)
#:use-module ((guix combinators) #:select (fold2))
#:use-module (ice-9 format)

1
gnu/local.mk
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@ -468,6 +468,7 @@ GNU_SYSTEM_MODULES = \
%D%/system/nss.scm \
%D%/system/pam.scm \
%D%/system/shadow.scm \
%D%/system/uuid.scm \
%D%/system/vm.scm \
\
%D%/build/activation.scm \

22
gnu/system/file-systems.scm
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@ -20,9 +20,10 @@
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (guix records)
#:use-module ((gnu build file-systems)
#:select (string->uuid uuid->string))
#:re-export (string->uuid
#:use-module ((gnu system uuid)
#:select (uuid string->uuid uuid->string))
#:re-export (uuid ;backward compatibility
string->uuid
uuid->string)
#:export (<file-system>
file-system
@ -44,7 +45,6 @@
file-system->spec
spec->file-system
specification->file-system-mapping
uuid
%fuse-control-file-system
%binary-format-file-system
@ -186,20 +186,6 @@ TARGET in the other system."
(target spec)
(writable? writable?)))))
(define-syntax uuid
(lambda (s)
"Return the bytevector corresponding to the given UUID representation."
(syntax-case s ()
((_ str)
(string? (syntax->datum #'str))
;; A literal string: do the conversion at expansion time.
(let ((bv (string->uuid (syntax->datum #'str))))
(unless bv
(syntax-violation 'uuid "invalid UUID" s))
(datum->syntax #'str bv)))
((_ str)
#'(string->uuid str)))))
;;;
;;; Common file systems.

227
gnu/system/uuid.scm Normal file
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@ -0,0 +1,227 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Danny Milosavljevic <dannym@scratchpost.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu system uuid)
#:use-module (srfi srfi-1)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
#:use-module (ice-9 regex)
#:use-module (ice-9 format)
#:export (uuid
uuid->string
dce-uuid->string
string->uuid
string->dce-uuid
string->iso9660-uuid
string->ext2-uuid
string->ext3-uuid
string->ext4-uuid
string->btrfs-uuid
iso9660-uuid->string
;; XXX: For lack of a better place.
sub-bytevector
latin1->string))
;;;
;;; Tools that lack a better place.
;;;
(define (sub-bytevector bv start size)
"Return a copy of the SIZE bytes of BV starting from offset START."
(let ((result (make-bytevector size)))
(bytevector-copy! bv start result 0 size)
result))
(define (latin1->string bv terminator)
"Return a string of BV, a latin1 bytevector, or #f. TERMINATOR is a predicate
that takes a number and returns #t when a termination character is found."
(let ((bytes (take-while (negate terminator) (bytevector->u8-list bv))))
(if (null? bytes)
#f
(list->string (map integer->char bytes)))))
;;;
;;; DCE UUIDs.
;;;
(define-syntax %network-byte-order
(identifier-syntax (endianness big)))
(define (dce-uuid->string uuid)
"Convert UUID, a 16-byte bytevector, to its string representation, something
like \"6b700d61-5550-48a1-874c-a3d86998990e\"."
;; See <https://tools.ietf.org/html/rfc4122>.
(let ((time-low (bytevector-uint-ref uuid 0 %network-byte-order 4))
(time-mid (bytevector-uint-ref uuid 4 %network-byte-order 2))
(time-hi (bytevector-uint-ref uuid 6 %network-byte-order 2))
(clock-seq (bytevector-uint-ref uuid 8 %network-byte-order 2))
(node (bytevector-uint-ref uuid 10 %network-byte-order 6)))
(format #f "~8,'0x-~4,'0x-~4,'0x-~4,'0x-~12,'0x"
time-low time-mid time-hi clock-seq node)))
(define %uuid-rx
;; The regexp of a UUID.
(make-regexp "^([[:xdigit:]]{8})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{12})$"))
(define (string->dce-uuid str)
"Parse STR as a DCE UUID (see <https://tools.ietf.org/html/rfc4122>) and
return its contents as a 16-byte bytevector. Return #f if STR is not a valid
UUID representation."
(and=> (regexp-exec %uuid-rx str)
(lambda (match)
(letrec-syntax ((hex->number
(syntax-rules ()
((_ index)
(string->number (match:substring match index)
16))))
(put!
(syntax-rules ()
((_ bv index (number len) rest ...)
(begin
(bytevector-uint-set! bv index number
(endianness big) len)
(put! bv (+ index len) rest ...)))
((_ bv index)
bv))))
(let ((time-low (hex->number 1))
(time-mid (hex->number 2))
(time-hi (hex->number 3))
(clock-seq (hex->number 4))
(node (hex->number 5))
(uuid (make-bytevector 16)))
(put! uuid 0
(time-low 4) (time-mid 2) (time-hi 2)
(clock-seq 2) (node 6)))))))
;;;
;;; ISO-9660.
;;;
;; <http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-119.pdf>.
(define %iso9660-uuid-rx
;; Y m d H M S ss
(make-regexp "^([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})-([[:digit:]]{2})$"))
(define (string->iso9660-uuid str)
"Parse STR as a ISO9660 UUID (which is really a timestamp - see /dev/disk/by-uuid).
Return its contents as a 16-byte bytevector. Return #f if STR is not a valid
ISO9660 UUID representation."
(and=> (regexp-exec %iso9660-uuid-rx str)
(lambda (match)
(letrec-syntax ((match-numerals
(syntax-rules ()
((_ index (name rest ...) body)
(let ((name (match:substring match index)))
(match-numerals (+ 1 index) (rest ...) body)))
((_ index () body)
body))))
(match-numerals 1 (year month day hour minute second hundredths)
(string->utf8 (string-append year month day
hour minute second hundredths)))))))
(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) "-"))))
;;;
;;; FAT32.
;;;
(define-syntax %fat32-endianness
;; Endianness of FAT file systems.
(identifier-syntax (endianness little)))
(define (fat32-uuid->string uuid)
"Convert fat32 UUID, a 4-byte bytevector, to its string representation."
(let ((high (bytevector-uint-ref uuid 0 %fat32-endianness 2))
(low (bytevector-uint-ref uuid 2 %fat32-endianness 2)))
(format #f "~:@(~x-~x~)" low high)))
;;;
;;; Generic interface.
;;;
(define string->ext2-uuid string->dce-uuid)
(define string->ext3-uuid string->dce-uuid)
(define string->ext4-uuid string->dce-uuid)
(define string->btrfs-uuid string->dce-uuid)
(define-syntax vhashq
(syntax-rules (=>)
((_)
vlist-null)
((_ (key others ... => value) rest ...)
(vhash-consq key value
(vhashq (others ... => value) rest ...)))
((_ (=> value) rest ...)
(vhashq rest ...))))
(define %uuid-parsers
(vhashq
('dce 'ext2 'ext3 'ext4 'btrfs 'luks => string->dce-uuid)
('iso9660 => string->iso9660-uuid)))
(define %uuid-printers
(vhashq
('dce 'ext2 'ext3 'ext4 'btrfs 'luks => dce-uuid->string)
('iso9660 => iso9660-uuid->string)
('fat32 'fat => fat32-uuid->string)))
(define* (string->uuid str #:key (type 'dce))
"Parse STR as a UUID of the given TYPE. On success, return the
corresponding bytevector; otherwise return #f."
(match (vhash-assq type %uuid-parsers)
(#f #f)
((_ . (? procedure? parse)) (parse str))))
(define* (uuid->string bv #:key (type 'dce))
"Convert BV, a bytevector, to the UUID string representation for TYPE."
(match (vhash-assq type %uuid-printers)
(#f #f)
((_ . (? procedure? unparse)) (unparse bv))))
(define-syntax uuid
(lambda (s)
"Return the bytevector corresponding to the given UUID representation."
(syntax-case s ()
((_ str)
(string? (syntax->datum #'str))
;; A literal string: do the conversion at expansion time.
(let ((bv (string->uuid (syntax->datum #'str))))
(unless bv
(syntax-violation 'uuid "invalid UUID" s))
(datum->syntax #'str bv)))
((_ str)
#'(string->uuid str)))))