From dffc5ab5e47e45b94188828205c8d567994926ad Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Thu, 8 Mar 2018 11:55:06 +0100 Subject: vm: Use 9p mount tags below 32 chars. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixes . Reported by Björn Höfling . * gnu/system/vm.scm (file-system->mount-tag): Use 'sha1' to compute the tag. --- gnu/system/vm.scm | 14 ++++++++------ 1 file 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 @@ (define-module (gnu system vm) #: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 @@ (define root-uuid (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." -- cgit v1.2.3