diff options
Diffstat (limited to 'gnu/system')
| -rw-r--r-- | gnu/system/file-systems.scm | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm index 33926444b6..ece8fb41e6 100644 --- a/gnu/system/file-systems.scm +++ b/gnu/system/file-systems.scm @@ -18,9 +18,13 @@ (define-module (gnu system file-systems) #:use-module (ice-9 match) + #:use-module (ice-9 regex) #:use-module (guix gexp) #:use-module (guix records) #:use-module (guix store) + #:use-module (rnrs bytevectors) + #:use-module ((gnu build file-systems) #:select (uuid->string)) + #:re-export (uuid->string) #:export (<file-system> file-system file-system? @@ -35,6 +39,8 @@ file-system-create-mount-point? file-system->spec + string->uuid + uuid %fuse-control-file-system %binary-format-file-system @@ -106,6 +112,57 @@ initrd code." (($ <file-system> device title mount-point type flags options _ check?) (list device title mount-point type flags options check?)))) +(define %uuid-rx + ;; The regexp of a UUID. + (make-regexp "^([[:xdigit:]]{8})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{12})$")) + +(define (string->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-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. + (with-syntax ((bv (string->uuid (syntax->datum #'str)))) + #''bv)) + ((_ str) + #'(string->uuid str))))) + + +;;; +;;; Common file systems. +;;; + (define %fuse-control-file-system ;; Control file system for Linux' file systems in user-space (FUSE). (file-system |