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01/01: vm: 'vm-image' images refer to the root file system by UUID.
From: |
Ludovic Courtès |
Subject: |
01/01: vm: 'vm-image' images refer to the root file system by UUID. |
Date: |
Sun, 7 Jan 2018 09:09:29 -0500 (EST) |
civodul pushed a commit to branch master
in repository guix.
commit 61b94b8c32e23d83f805ad349060c56b165ea401
Author: Ludovic Courtès <address@hidden>
Date: Sun Jan 7 15:06:36 2018 +0100
vm: 'vm-image' images refer to the root file system by UUID.
This avoids the hard-coded "/dev/sda1", which only made sense when the
image is run with "qemu-system-x86_64 -hda", not when it's passed to
Xen, etc.
Reported by Andreas Enge <address@hidden>.
* gnu/system/vm.scm (system-qemu-image): Define 'root-uuid', use it as
the 'device' field for "/", and pass it to 'qemu-image'.
---
gnu/system/vm.scm | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 53629da..496f2ac 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <address@hidden>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès
<address@hidden>
;;; Copyright © 2016 Christopher Allan Webber <address@hidden>
;;; Copyright © 2016, 2017 Leo Famulari <address@hidden>
;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
@@ -503,6 +503,14 @@ of the GNU system as described by OS."
(string-prefix? "/dev/" source))))
(operating-system-file-systems os)))
+ (define root-uuid
+ ;; UUID of the root file system.
+ (operating-system-uuid os
+ (if (string=? file-system-type "iso9660")
+ 'iso9660
+ 'dce)))
+
+
(let ((os (operating-system (inherit os)
;; Use an initrd with the whole QEMU shebang.
(initrd (lambda (file-systems . rest)
@@ -511,10 +519,13 @@ of the GNU system as described by OS."
#:virtio? #t
rest)))
- ;; Force our own root file system.
+ ;; Force our own root file system. Refer to it by UUID so that
+ ;; it works regardless of how the image is used ("qemu -hda",
+ ;; Xen, etc.).
(file-systems (cons (file-system
(mount-point "/")
- (device "/dev/sda1")
+ (device root-uuid)
+ (title 'uuid)
(type file-system-type))
file-systems-to-keep)))))
(mlet* %store-monad
@@ -526,6 +537,7 @@ of the GNU system as described by OS."
(operating-system-bootloader os))
#:disk-image-size disk-image-size
#:file-system-type file-system-type
+ #:file-system-uuid root-uuid
#:inputs `(("system" ,os-drv)
("bootcfg" ,bootcfg))
#:copy-inputs? #t))))