diff options
Diffstat (limited to 'gnu/build/file-systems.scm')
| -rw-r--r-- | gnu/build/file-systems.scm | 61 |
1 files changed, 56 insertions, 5 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm index 00af35d3df..f8b8697b46 100644 --- a/gnu/build/file-systems.scm +++ b/gnu/build/file-systems.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -23,6 +23,7 @@ #:use-module (ice-9 match) #:use-module (ice-9 rdelim) #:use-module (ice-9 format) + #:use-module (ice-9 regex) #:use-module (system foreign) #:autoload (system repl repl) (start-repl) #:use-module (srfi srfi-1) @@ -34,6 +35,9 @@ find-partition-by-uuid canonicalize-device-spec + uuid->string + string->uuid + MS_RDONLY MS_NOSUID MS_NODEV @@ -213,6 +217,11 @@ or #f if none was found." (disk-partitions)) (cut string-append "/dev/" <>))) + +;;; +;;; UUIDs. +;;; + (define-syntax %network-byte-order (identifier-syntax (endianness big))) @@ -228,6 +237,41 @@ like \"6b700d61-5550-48a1-874c-a3d86998990e\"." (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->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* (canonicalize-device-spec spec #:optional (title 'any)) "Return the device name corresponding to SPEC. TITLE is a symbol, one of the following: @@ -251,9 +295,12 @@ the following: ;; The realm of canonicalization. (if (eq? title 'any) (if (string? spec) - (if (string-prefix? "/" spec) - 'device - 'label) + ;; The "--root=SPEC" kernel command-line option always provides a + ;; string, but the string can represent a device, a UUID, or a + ;; label. So check for all three. + (cond ((string-prefix? "/" spec) 'device) + ((string->uuid spec) 'uuid) + (else 'label)) 'uuid) title)) @@ -279,7 +326,11 @@ the following: ;; Resolve the label. (resolve find-partition-by-label spec identity)) ((uuid) - (resolve find-partition-by-uuid spec uuid->string)) + (resolve find-partition-by-uuid + (if (string? spec) + (string->uuid spec) + spec) + uuid->string)) (else (error "unknown device title" title)))) |