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-rw-r--r--gnu/services/base.scm25
1 files changed, 23 insertions, 2 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index b38d3e3765..3bb4f9721b 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -418,7 +418,7 @@ starting at FIRST-UID, and under GID."
;; guix-daemon expects GROUP to be listed as a
;; supplementary group too:
;; <http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html>.
- (supplementary-groups (list group))
+ (supplementary-groups (list group "kvm"))
(comment (format #f "Guix Build User ~2d" n))
(home-directory "/var/empty")
@@ -526,10 +526,31 @@ item of @var{packages}."
(guix build utils))
#:local-build? #t))
+(define* (kvm-udev-rule)
+ "Return a directory with a udev rule that changes the group of
+@file{/dev/kvm} to \"kvm\" and makes it #o660."
+ ;; Apparently QEMU-KVM used to ship this rule, but now we have to add it by
+ ;; ourselves.
+ (gexp->derivation "kvm-udev-rules"
+ #~(begin
+ (use-modules (guix build utils))
+
+ (define rules.d
+ (string-append #$output "/lib/udev/rules.d"))
+
+ (mkdir-p rules.d)
+ (call-with-output-file
+ (string-append rules.d "/90-kvm.rules")
+ (lambda (port)
+ (display "\
+KERNEL==\"kvm\", GROUP=\"kvm\", MODE=\"0660\"\n" port))))
+ #:modules '((guix build utils))))
+
(define* (udev-service #:key (udev eudev) (rules '()))
"Run @var{udev}, which populates the @file{/dev} directory dynamically. Get
extra rules from the packages listed in @var{rules}."
- (mlet* %store-monad ((rules (udev-rules-union (cons udev rules)))
+ (mlet* %store-monad ((kvm (kvm-udev-rule))
+ (rules (udev-rules-union (cons* udev kvm rules)))
(udev.conf (text-file* "udev.conf"
"udev_rules=\"" rules
"/lib/udev/rules.d\"\n")))