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system: grub: Allow arbitrary kernel file names in 'menu-entry'. 

Fixes <http://bugs.gnu.org/20067>.
Reported by Tomáš Čech <sleep_walker@suse.cz>.

* gnu/system.scm (system-linux-image-file-name)
(operating-system-kernel-file): New procedures.
(operating-system-grub.cfg): Use 'operating-system-kernel-file' for the
'kernel' field of 'menu-entry'.
(operating-system-parameters-file): Likewise for the 'kernel' entry.
(read-boot-parameters): Adjust 'kernel' field so that it contains the
absolute file name of the image.
* gnu/system/grub.scm (grub-configuration-file)[linux-image-name]:
Remove.
[entry->gexp]: Assume LINUX is the absolute file name of the kernel
image.
* doc/guix.texi (GRUB Configuration): Add an example, and adjust
'kernel' field documentation accordingly.
This commit is contained in:
Ludovic Courtès 2016-09-09 23:27:00 +02:00
parent a9e5e92f94
commit 44d5f54e31
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GPG Key ID: 090B11993D9AEBB5
3 changed files with 49 additions and 16 deletions
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22
doc/guix.texi
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@ -10622,9 +10622,23 @@ The @code{grub-theme} object describing the theme to use.
@end deftp
@cindex dual boot
@cindex boot menu
Should you want to list additional boot menu entries @i{via} the
@code{menu-entries} field above, you will need to create them with the
@code{menu-entry} form:
@code{menu-entry} form. For example, imagine you want to be able to
boot another distro (hard to imagine!), you can define a menu entry
along these lines:
@example
(menu-entry
(label "The Other Distro")
(linux "/boot/old/vmlinux-2.6.32")
(linux-arguments '("root=/dev/sda2"))
(initrd "/boot/old/initrd"))
@end example
Details below.
@deftp {Data Type} menu-entry
The type of an entry in the GRUB boot menu.
@ -10635,7 +10649,11 @@ The type of an entry in the GRUB boot menu.
The label to show in the menu---e.g., @code{"GNU"}.
@item @code{linux}
The Linux kernel to boot.
The Linux kernel image to boot, for example:
@example
(file-append linux-libre "/bzImage")
@end example
@item @code{linux-arguments} (default: @code{()})
The list of extra Linux kernel command-line arguments---e.g.,

30
gnu/system.scm
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@ -69,6 +69,7 @@
operating-system-host-name
operating-system-hosts-file
operating-system-kernel
operating-system-kernel-file
operating-system-kernel-arguments
operating-system-initrd
operating-system-users
@ -246,6 +247,19 @@ from the initrd."
"Return the list of swap services for OS."
(map swap-service (operating-system-swap-devices os)))
(define* (system-linux-image-file-name #:optional (system (%current-system)))
"Return the basename of the kernel image file for SYSTEM."
;; FIXME: Evaluate the conditional based on the actual current system.
(if (string-prefix? "mips" (%current-system))
"vmlinuz"
"bzImage"))
(define (operating-system-kernel-file os)
"Return an object representing the absolute file name of the kernel image of
OS."
(file-append (operating-system-kernel os)
"/" (system-linux-image-file-name os)))
(define* (operating-system-directory-base-entries os #:key container?)
"Return the basic entries of the 'system' directory of OS for use as the
value of the SYSTEM-SERVICE-TYPE service."
@ -710,12 +724,13 @@ listed in OS. The C library expects to find it under
((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))
(label -> (kernel->grub-label (operating-system-kernel os)))
(kernel -> (operating-system-kernel-file os))
(root-device -> (if (eq? 'uuid (file-system-title root-fs))
(uuid->string (file-system-device root-fs))
(file-system-device root-fs)))
(entries -> (list (menu-entry
(label (kernel->grub-label kernel))
(label label)
(linux kernel)
(linux-arguments
(cons* (string-append "--root=" root-device)
@ -739,7 +754,7 @@ this file is the reconstruction of GRUB menu entries for old configurations."
#~(boot-parameters (version 0)
(label #$label)
(root-device #$(file-system-device root))
(kernel #$(operating-system-kernel os))
(kernel #$(operating-system-kernel-file os))
(kernel-arguments
#$(operating-system-kernel-arguments os))
(initrd #$initrd))
@ -768,7 +783,14 @@ this file is the reconstruction of GRUB menu entries for old configurations."
(boot-parameters
(label label)
(root-device root)
(kernel linux)
;; In the past, we would store the directory name of the kernel instead
;; of the absolute file name of its image. Detect that and correct it.
(kernel (if (string=? linux (direct-store-path linux))
(string-append linux "/"
(system-linux-image-file-name))
linux))
(kernel-arguments
(match (assq 'kernel-arguments rest)
((_ args) args)

13
gnu/system/grub.scm
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@ -243,11 +243,6 @@ code."
<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"
"bzImage"))
(define all-entries
(append entries (grub-configuration-menu-entries config)))
@ -256,14 +251,12 @@ corresponding to old generations of the system."
(($ <menu-entry> label linux arguments initrd)
#~(format port "menuentry ~s {
~a
linux ~a/~a ~a
linux ~a ~a
initrd ~a
}~%"
#$label
#$(grub-root-search store-fs
#~(string-append #$linux "/"
#$linux-image-name))
#$linux #$linux-image-name (string-join (list #$@arguments))
#$(grub-root-search store-fs linux)
#$linux (string-join (list #$@arguments))
#$initrd))))
(mlet %store-monad ((sugar (eye-candy config store-fs system #~port)))