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-rw-r--r--doc/guix.texi22
-rw-r--r--gnu/system.scm30
-rw-r--r--gnu/system/grub.scm13
3 files changed, 49 insertions, 16 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 6d3361878b..7ed8ee8130 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -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.,
diff --git a/gnu/system.scm b/gnu/system.scm
index 080201011c..18b2806fe9 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -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)
diff --git a/gnu/system/grub.scm b/gnu/system/grub.scm
index aa93c0f454..4592747083 100644
--- a/gnu/system/grub.scm
+++ b/gnu/system/grub.scm
@@ -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)))