gnu: grub: Support for network boot via TFTP.
* gnu/bootloader/grub.scm (grub-efi-netboot-bootloader): New variable. (install-grub-efi-netboot): New procedure. (grub-root-search): Update comment. Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>
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Stefan
Danny Milosavljevic
parent
59223c5bc6
commit
c85f316ae9
@ -23,8 +23,10 @@
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu bootloader grub)
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#:use-module (guix build union)
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#:use-module (guix records)
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#:use-module ((guix utils) #:select (%current-system))
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (guix gexp)
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#:use-module (gnu artwork)
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#:use-module (gnu bootloader)
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@ -46,8 +48,11 @@
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grub-theme-color-highlight
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grub-theme-gfxmode
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install-grub-efi-netboot
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grub-bootloader
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grub-efi-bootloader
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grub-efi-netboot-bootloader
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grub-mkrescue-bootloader
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grub-minimal-bootloader
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@ -297,9 +302,11 @@ code."
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(file-system-label->string label)))
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((? (lambda (device)
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(and (string? device) (string-contains device ":/"))) nfs-uri)
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;; This assumes that if your root file system is on NFS, then
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;; you also want to load your grub extra files, kernel and initrd
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;; from there.
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;; If the device is an NFS share, then we assume that the expected
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;; file on that device (e.g. the GRUB background image or the kernel)
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;; has to be loaded over the network. Otherwise we would need an
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;; additional device information for some local disk to look for that
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;; file, which we do not have.
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;;
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;; We explicitly set "root=(tftp)" here even though if grub.cfg
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;; had been loaded via TFTP, Grub would have set "root=(tftp)"
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@ -528,6 +535,99 @@ fi~%"))))
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"--bootloader-id=Guix"
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"--efi-directory" target-esp))))
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(define (install-grub-efi-netboot subdir)
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"Define a grub-efi-netboot bootloader installer for installation in SUBDIR,
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which is usually efi/Guix or efi/boot."
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(let* ((system (string-split (nix-system->gnu-triplet
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(or (%current-target-system)
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(%current-system)))
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#\-))
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(arch (first system))
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(boot-efi-link (match system
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;; These are the supportend systems and the names
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;; defined by the UEFI standard for removable media.
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(("i686" _ ...) "/bootia32.efi")
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(("x86_64" _ ...) "/bootx64.efi")
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(("arm" _ ...) "/bootarm.efi")
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(("aarch64" _ ...) "/bootaa64.efi")
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(("riscv" _ ...) "/bootriscv32.efi")
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(("riscv64" _ ...) "/bootriscv64.efi")
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;; Other systems are not supported, although defined.
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;; (("riscv128" _ ...) "/bootriscv128.efi")
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;; (("ia64" _ ...) "/bootia64.efi")
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((_ ...) #f)))
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(core-efi (string-append
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;; This is the arch dependent file name of GRUB, e.g.
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;; i368-efi/core.efi or arm64-efi/core.efi.
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(match arch
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("i686" "i386")
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("aarch64" "arm64")
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("riscv" "riscv32")
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(_ arch))
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"-efi/core.efi")))
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(with-imported-modules
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'((guix build union))
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#~(lambda (bootloader target mount-point)
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"Install the BOOTLOADER, which must be the package grub, as e.g.
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bootx64.efi or bootaa64.efi into SUBDIR, which is usually efi/Guix or efi/boot,
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below the directory TARGET for the system whose root is mounted at MOUNT-POINT.
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MOUNT-POINT is the last argument in 'guix system init /etc/config.scm mnt/point'
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or '/' for other 'guix system' commands.
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TARGET is the target argument given to the bootloader-configuration in
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(operating-system
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(bootloader (bootloader-configuration
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(target \"/boot\")
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…))
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…)
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TARGET is required to be an absolute directory name, usually mounted via NFS,
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and finally needs to be provided by a TFTP server as the TFTP root directory.
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GRUB will load tftp://server/SUBDIR/grub.cfg and this file will instruct it to
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load more files from the store like tftp://server/gnu/store/…-linux…/Image.
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To make this possible two symlinks will be created. The first symlink points
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relatively form MOUNT-POINT/TARGET/SUBDIR/grub.cfg to
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MOUNT-POINT/boot/grub/grub.cfg, and the second symlink points relatively from
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MOUNT-POINT/TARGET/%store-prefix to MOUNT-POINT/%store-prefix.
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It is important to note that these symlinks need to be relativ, as the absolute
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paths on the TFTP server side are unknown.
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It is also important to note that both symlinks will point outside the TFTP root
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directory and that the TARGET/%store-prefix symlink makes the whole store
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accessible via TFTP. Possibly the TFTP server must be configured
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to allow accesses outside its TFTP root directory. This may need to be
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considered for security aspects."
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(use-modules ((guix build union) #:select (symlink-relative)))
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(let* ((net-dir (string-append mount-point target "/"))
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(sub-dir (string-append net-dir #$subdir "/"))
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(store (string-append mount-point (%store-prefix)))
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(store-link (string-append net-dir (%store-prefix)))
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(grub-cfg (string-append mount-point "/boot/grub/grub.cfg"))
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(grub-cfg-link (string-append sub-dir (basename grub-cfg)))
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(boot-efi-link (string-append sub-dir #$boot-efi-link)))
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;; Prepare the symlink to the store.
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(mkdir-p (dirname store-link))
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(false-if-exception (delete-file store-link))
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(symlink-relative store store-link)
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;; Prepare the symlink to the grub.cfg, which points into the store.
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(mkdir-p (dirname grub-cfg-link))
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(false-if-exception (delete-file grub-cfg-link))
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(symlink-relative grub-cfg grub-cfg-link)
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;; Install GRUB, which refers to the grub.cfg, with support for
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;; encrypted partitions,
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(setenv "GRUB_ENABLE_CRYPTODISK" "y")
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(invoke/quiet (string-append bootloader "/bin/grub-mknetdir")
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(string-append "--net-directory=" net-dir)
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(string-append "--subdir=" #$subdir))
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;; Prepare the bootloader symlink, which points to core.efi of GRUB.
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(false-if-exception (delete-file boot-efi-link))
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(symlink #$core-efi boot-efi-link))))))
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;;;
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@ -560,6 +660,12 @@ fi~%"))))
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(name 'grub-efi)
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(package grub-efi)))
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(define grub-efi-netboot-bootloader
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(bootloader
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(inherit grub-efi-bootloader)
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(name 'grub-efi-netboot-bootloader)
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(installer (install-grub-efi-netboot "efi/Guix"))))
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(define grub-mkrescue-bootloader
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(bootloader
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(inherit grub-efi-bootloader)
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