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-rw-r--r--gnu/system/vm.scm14
1 files changed, 8 insertions, 6 deletions
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 91ff32ce9a..ae8780d2e1 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -30,6 +30,8 @@
#:use-module (guix records)
#:use-module (guix modules)
#:use-module (guix utils)
+ #:use-module (guix hash)
+ #:use-module (guix base32)
#:use-module ((gnu build vm)
#:select (qemu-command))
@@ -544,13 +546,13 @@ of the GNU system as described by OS."
(define (file-system->mount-tag fs)
"Return a 9p mount tag for host file system FS."
- ;; QEMU mount tags cannot contain slashes and cannot start with '_'.
- ;; Compute an identifier that corresponds to the rules.
+ ;; QEMU mount tags must be ASCII, at most 31-byte long, cannot contain
+ ;; slashes, and cannot start with '_'. Compute an identifier that
+ ;; corresponds to the rules.
(string-append "TAG"
- (string-map (match-lambda
- (#\/ #\_)
- (chr chr))
- fs)))
+ (string-drop (bytevector->base32-string
+ (sha1 (string->utf8 fs)))
+ 4)))
(define (mapping->file-system mapping)
"Return a 9p file system that realizes MAPPING."