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system: grub: Search root device by label or UUID if possible. 

Fixes <http://bugs.gnu.org/22281>.
Reported by Christopher Allan Webber <cwebber@dustycloud.org>.

* gnu/system/grub.scm (eye-candy): Add 'root-fs' parameter.  Replace
'search --file' command in the output with whatever 'grub-root-search'
returns.
(grub-root-search): New procedure.
(grub-configuration-file): Add 'store-fs' parameter.  Use
'grub-root-search' instead of hard-coded 'search --file' commands.
* gnu/system.scm (store-file-system,
operating-system-store-file-system): New procedures.
(operating-system-grub.cfg): Use it, and adjust call to
'grub-configuration-file'.
* tests/system.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
master
Ludovic Courtès 2016-01-21 22:45:54 +01:00
parent 3738d8700f
commit 6b779207ee
4 changed files with 143 additions and 15 deletions
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1
Makefile.am
View File

@ -240,6 +240,7 @@ SCM_TESTS = \
tests/challenge.scm \
tests/cve.scm \
tests/file-systems.scm \
tests/system.scm \
tests/services.scm \
tests/containers.scm \
tests/import-utils.scm

26
gnu/system.scm
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@ -79,6 +79,7 @@
operating-system-locale-libcs
operating-system-mapped-devices
operating-system-file-systems
operating-system-store-file-system
operating-system-activation-script
operating-system-derivation
@ -678,12 +679,34 @@ listed in OS. The C library expects to find it under
(package-version kernel)
" (alpha)"))
(define (store-file-system file-systems)
"Return the file system object among FILE-SYSTEMS that contains the store."
(match (filter (lambda (fs)
(and (file-system-mount? fs)
(not (memq 'bind-mount (file-system-flags fs)))
(string-prefix? (file-system-mount-point fs)
(%store-prefix))))
file-systems)
((and candidates (head . tail))
(reduce (lambda (fs1 fs2)
(if (> (string-length (file-system-mount-point fs1))
(string-length (file-system-mount-point fs2)))
fs1
fs2))
head
candidates))))
(define (operating-system-store-file-system os)
"Return the file system that contains the store of OS."
(store-file-system (operating-system-file-systems os)))
(define* (operating-system-grub.cfg os #:optional (old-entries '()))
"Return the GRUB configuration file for OS. Use OLD-ENTRIES to populate the
\"old entries\" menu."
(mlet* %store-monad
((system (operating-system-derivation os))
(root-fs -> (operating-system-root-file-system os))
(store-fs -> (operating-system-store-file-system os))
(kernel -> (operating-system-kernel os))
(root-device -> (if (eq? 'uuid (file-system-title root-fs))
(uuid->string (file-system-device root-fs))
@ -698,7 +721,8 @@ listed in OS. The C library expects to find it under
"/boot")
(operating-system-kernel-arguments os)))
(initrd #~(string-append #$system "/initrd"))))))
(grub-configuration-file (operating-system-bootloader os) entries
(grub-configuration-file (operating-system-bootloader os)
store-fs entries
#:old-entries old-entries)))
(define (operating-system-parameters-file os)

54
gnu/system/grub.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -25,6 +25,7 @@
#:use-module (guix gexp)
#:use-module (guix download)
#:use-module (gnu artwork)
#:use-module (gnu system file-systems)
#:autoload (gnu packages grub) (grub)
#:autoload (gnu packages inkscape) (inkscape)
#:autoload (gnu packages imagemagick) (imagemagick)
@ -153,10 +154,12 @@ WIDTH/HEIGHT, or #f if none was found."
(with-monad %store-monad
(return #f)))))
(define (eye-candy config system port)
(define (eye-candy config root-fs system port)
"Return in %STORE-MONAD a gexp that writes to PORT (a port-valued gexp) the
'grub.cfg' part concerned with graphics mode, background images, colors, and
all that."
all that. ROOT-FS is a file-system object denoting the root file system where
the store is. SYSTEM must be the target system string---e.g.,
\"x86_64-linux\"."
(define setup-gfxterm-body
;; Intel systems need to be switched into graphics mode, whereas most
;; other modern architectures have no other mode and therefore don't need
@ -179,15 +182,18 @@ all that."
(string-append (symbol->string (assoc-ref colors 'fg)) "/"
(symbol->string (assoc-ref colors 'bg)))))
(define font-file
#~(string-append #$grub "/share/grub/unicode.pf2"))
(mlet* %store-monad ((image (grub-background-image config)))
(return (and image
#~(format #$port "
function setup_gfxterm {~a}
# Set 'root' to the partition that contains /gnu/store.
search --file --set ~a/share/grub/unicode.pf2
~a
if loadfont ~a/share/grub/unicode.pf2; then
if loadfont ~a; then
setup_gfxterm
fi
@ -200,7 +206,9 @@ else
set menu_color_highlight=white/blue
fi~%"
#$setup-gfxterm-body
#$grub #$grub
#$(grub-root-search root-fs font-file)
#$font-file
#$image
#$(theme-colors grub-theme-color-normal)
#$(theme-colors grub-theme-color-highlight))))))
@ -210,13 +218,31 @@ fi~%"
;;; Configuration file.
;;;
(define* (grub-configuration-file config entries
(define (grub-root-search root-fs file)
"Return the GRUB 'search' command to look for ROOT-FS, which contains FILE,
a gexp. The result is a gexp that can be inserted in the grub.cfg-generation
code."
(case (file-system-title root-fs)
;; Preferably refer to ROOT-FS by its UUID or label. This is more
;; efficient and less ambiguous, see <>.
((uuid)
(format #f "search --fs-uuid --set ~a"
(uuid->string (file-system-device root-fs))))
((label)
(format #f "search --label --set ~a"
(file-system-device root-fs)))
(else
;; As a last resort, look for any device containing FILE.
#~(format #f "search --file --set ~a" #$file))))
(define* (grub-configuration-file config store-fs entries
#:key
(system (%current-system))
(old-entries '()))
"Return the GRUB configuration file corresponding to CONFIG, a
<grub-configuration> object. OLD-ENTRIES is taken to be a list of menu
entries corresponding to old generations of the system."
<grub-configuration> object, and where the store is available at STORE-FS, a
<file-system> object. OLD-ENTRIES is taken to be a list of menu entries
corresponding to old generations of the system."
(define linux-image-name
(if (string-prefix? "mips" system)
"vmlinuz"
@ -229,18 +255,18 @@ entries corresponding to old generations of the system."
(match-lambda
(($ <menu-entry> label linux arguments initrd)
#~(format port "menuentry ~s {
# Set 'root' to the partition that contains the kernel.
search --file --set ~a/~a~%
~a
linux ~a/~a ~a
initrd ~a
}~%"
#$label
#$linux #$linux-image-name
#$(grub-root-search store-fs
#~(string-append #$linux "/"
#$linux-image-name))
#$linux #$linux-image-name (string-join (list #$@arguments))
#$initrd))))
(mlet %store-monad ((sugar (eye-candy config system #~port)))
(mlet %store-monad ((sugar (eye-candy config store-fs system #~port)))
(define builder
#~(call-with-output-file #$output
(lambda (port)

77
tests/system.scm 100644
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@ -0,0 +1,77 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-system)
#:use-module (gnu)
#:use-module (guix store)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-64))
;; Test the (gnu system) module.
(define %root-fs
(file-system
(device "my-root")
(title 'label)
(mount-point "/")
(type "ext4")))
(define %os
(operating-system
(host-name "komputilo")
(timezone "Europe/Berlin")
(locale "en_US.utf8")
(bootloader (grub-configuration (device "/dev/sdX")))
(file-systems (cons %root-fs %base-file-systems))
(users %base-user-accounts)))
(test-begin "system")
(test-assert "operating-system-store-file-system"
;; %BASE-FILE-SYSTEMS defines a bind-mount for /gnu/store, but this
;; shouldn't be a problem.
(eq? %root-fs
(operating-system-store-file-system %os)))
(test-assert "operating-system-store-file-system, prefix"
(let* ((gnu (file-system
(device "foobar")
(mount-point (dirname (%store-prefix)))
(type "ext5")))
(os (operating-system
(inherit %os)
(file-systems (cons* gnu %root-fs
%base-file-systems)))))
(eq? gnu (operating-system-store-file-system os))))
(test-assert "operating-system-store-file-system, store"
(let* ((gnu (file-system
(device "foobar")
(mount-point (%store-prefix))
(type "ext5")))
(os (operating-system
(inherit %os)
(file-systems (cons* gnu %root-fs
%base-file-systems)))))
(eq? gnu (operating-system-store-file-system os))))
(test-end)
(exit (= (test-runner-fail-count (test-runner-current)) 0))