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-rw-r--r--gnu/bootloader/grub.scm27
1 files changed, 27 insertions, 0 deletions
diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index e3febeefd0..f69bf8ed4d 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -295,6 +295,33 @@ code."
((? file-system-label? label)
(format #f "search --label --set ~a"
(file-system-label->string label)))
+ ((? (lambda (device)
+ (and (string? device) (string-contains device ":/"))) nfs-uri)
+ ;; This assumes that if your root file system is on NFS, then
+ ;; you also want to load your grub extra files, kernel and initrd
+ ;; from there.
+ ;;
+ ;; We explicitly set "root=(tftp)" here even though if grub.cfg
+ ;; had been loaded via TFTP, Grub would have set "root=(tftp)"
+ ;; automatically anyway. The reason is if you have a system that
+ ;; used to be on NFS but now is local, root would be set to local
+ ;; disk. If you then selected an older system generation that is
+ ;; supposed to boot from network in the Grub boot menu, Grub still
+ ;; wouldn't load those files from network otherwise.
+ ;;
+ ;; TFTP is preferred to HTTP because it is used more widely and
+ ;; specified in standards more widely--especially BOOTP/DHCPv4
+ ;; defines a TFTP server for DHCP option 66, but not HTTP.
+ ;;
+ ;; Note: DHCPv6 specifies option 59 to contain a boot-file-url,
+ ;; which can contain a HTTP or TFTP URL.
+ ;;
+ ;; Note: It is assumed that the file paths are of a similar
+ ;; setup on both the TFTP server and the NFS server (it is
+ ;; not possible to search for files on TFTP).
+ ;;
+ ;; TODO: Allow HTTP.
+ "set root=(tftp)")
((or #f (? string?))
#~(format #f "search --file --set ~a" #$file)))))