This module generates a /boot/extlinux/extlinux.conf bootloader configuration file that is supported by e.g. U-Boot: http://git.denx.de/?p=u-boot.git;a=blob;f=doc/README.distro;hb=refs/heads/master With this, all ARM boards supported by U-Boot can be booted in a common way (a single boot file generator, all boards booting via initrd like x86) and with same boot menu functionality as GRUB has. -- sample extlinux.conf file -- # Generated file, all changes will be lost on nixos-rebuild! # Change this to e.g. nixos-42 to temporarily boot to an older configuration. DEFAULT nixos-default TIMEOUT 50 LABEL nixos-default MENU LABEL NixOS - Default LINUX ../nixos/n7vxfk60nb5h0mcbhkwwxhcz2q2nvxzv-linux-4.1.0-rc3-cpufreq-zImage INITRD ../nixos/0ss2zs8sb6d1qn4gblxpwlxkfjsgs5f0-initrd-initrd FDTDIR ../nixos/n7vxfk60nb5h0mcbhkwwxhcz2q2nvxzv-linux-4.1.0-rc3-cpufreq-dtbs APPEND systemConfig=/nix/store/469qvr43ln8bfsnk5lzcz6m6jfcgdd4r-nixos-15.06.git.0b7a7a6M init=/nix/store/469qvr43ln8bfsnk5lzcz6m6jfcgdd4r-nixos-15.06.git.0b7a7a6M/init loglevel=8 console=ttyS0,115200n8 drm.debug=0xf LABEL nixos-71 MENU LABEL NixOS - Configuration 71 (2015-05-17 21:32 - 15.06.git.0b7a7a6M) LINUX ../nixos/n7vxfk60nb5h0mcbhkwwxhcz2q2nvxzv-linux-4.1.0-rc3-cpufreq-zImage INITRD ../nixos/0ss2zs8sb6d1qn4gblxpwlxkfjsgs5f0-initrd-initrd FDTDIR ../nixos/n7vxfk60nb5h0mcbhkwwxhcz2q2nvxzv-linux-4.1.0-rc3-cpufreq-dtbs APPEND systemConfig=/nix/store/469qvr43ln8bfsnk5lzcz6m6jfcgdd4r-nixos-15.06.git.0b7a7a6M init=/nix/store/469qvr43ln8bfsnk5lzcz6m6jfcgdd4r-nixos-15.06.git.0b7a7a6M/init loglevel=8 console=ttyS0,115200n8 drm.debug=0xfwip/yesman
Tuomas Tynkkynen
9 years ago
parent
e47fe46e03
commit
6d176afe5e
@ -0,0 +1,44 @@ |
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{ config, lib, pkgs, ... }: |
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with lib; |
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let |
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blCfg = config.boot.loader; |
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cfg = blCfg.generic-extlinux-compatible; |
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timeoutStr = if blCfg.timeout == null then "-1" else toString blCfg.timeout; |
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builder = import ./extlinux-conf-builder.nix { inherit pkgs; }; |
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in |
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{ |
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options = { |
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boot.loader.generic-extlinux-compatible = { |
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enable = mkOption { |
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default = false; |
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type = types.bool; |
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description = '' |
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Whether to generate an extlinux-compatible configuration file |
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under <literal>/boot/extlinux.conf</literal>. For instance, |
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U-Boot's generic distro boot support uses this file format. |
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See <link xlink:href="http://git.denx.de/?p=u-boot.git;a=blob;f=doc/README.distro;hb=refs/heads/master">U-boot's documentation</link> |
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for more information. |
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''; |
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}; |
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configurationLimit = mkOption { |
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default = 20; |
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example = 10; |
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type = types.int; |
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description = '' |
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Maximum number of configurations in the boot menu. |
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''; |
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}; |
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}; |
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}; |
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config = mkIf cfg.enable { |
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system.build.installBootLoader = "${builder} -g ${toString cfg.configurationLimit} -t ${timeoutStr} -c"; |
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system.boot.loader.id = "generic-extlinux-compatible"; |
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}; |
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} |
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@ -0,0 +1,8 @@ |
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{ pkgs }: |
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pkgs.substituteAll { |
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src = ./extlinux-conf-builder.sh; |
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isExecutable = true; |
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inherit (pkgs) bash; |
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path = [pkgs.coreutils pkgs.gnused pkgs.gnugrep]; |
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} |
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@ -0,0 +1,132 @@ |
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#! @bash@/bin/sh -e |
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shopt -s nullglob |
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export PATH=/empty |
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for i in @path@; do PATH=$PATH:$i/bin; done |
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usage() { |
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echo "usage: $0 -t <timeout> -c <path-to-default-configuration> [-d <boot-dir>] [-g <num-generations>]" >&2 |
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exit 1 |
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} |
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timeout= # Timeout in centiseconds |
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default= # Default configuration |
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target=/boot # Target directory |
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numGenerations=0 # Number of other generations to include in the menu |
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while getopts "t:c:d:g:" opt; do |
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case "$opt" in |
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t) # U-Boot interprets '0' as infinite and negative as instant boot |
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if [ "$OPTARG" -lt 0 ]; then |
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timeout=0 |
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elif [ "$OPTARG" = 0 ]; then |
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timeout=-10 |
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else |
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timeout=$((OPTARG * 10)) |
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fi |
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;; |
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c) default="$OPTARG" ;; |
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d) target="$OPTARG" ;; |
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g) numGenerations="$OPTARG" ;; |
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\?) usage ;; |
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esac |
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done |
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[ "$timeout" = "" -o "$default" = "" ] && usage |
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mkdir -p $target/nixos |
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mkdir -p $target/extlinux |
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# Convert a path to a file in the Nix store such as |
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# /nix/store/<hash>-<name>/file to <hash>-<name>-<file>. |
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cleanName() { |
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local path="$1" |
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echo "$path" | sed 's|^/nix/store/||' | sed 's|/|-|g' |
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} |
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# Copy a file from the Nix store to $target/nixos. |
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declare -A filesCopied |
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copyToKernelsDir() { |
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local src=$(readlink -f "$1") |
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local dst="$target/nixos/$(cleanName $src)" |
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# Don't copy the file if $dst already exists. This means that we |
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# have to create $dst atomically to prevent partially copied |
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# kernels or initrd if this script is ever interrupted. |
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if ! test -e $dst; then |
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local dstTmp=$dst.tmp.$$ |
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cp -r $src $dstTmp |
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mv $dstTmp $dst |
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fi |
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filesCopied[$dst]=1 |
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result=$dst |
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} |
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# Copy its kernel, initrd and dtbs to $target/nixos, and echo out an |
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# extlinux menu entry |
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addEntry() { |
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local path=$(readlink -f "$1") |
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local tag="$2" # Generation number or 'default' |
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if ! test -e $path/kernel -a -e $path/initrd; then |
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return |
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fi |
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copyToKernelsDir "$path/kernel"; kernel=$result |
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copyToKernelsDir "$path/initrd"; initrd=$result |
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# XXX UGLY: maybe the system config should have a top-level "dtbs" entry? |
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copyToKernelsDir $(readlink -m "$path/kernel/../dtbs"); dtbs=$result |
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timestampEpoch=$(stat -L -c '%Z' $path) |
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timestamp=$(date "+%Y-%m-%d %H:%M" -d @$timestampEpoch) |
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nixosVersion="$(cat $path/nixos-version)" |
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extraParams="$(cat $path/kernel-params)" |
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echo |
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echo "LABEL nixos-$tag" |
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if [ "$tag" = "default" ]; then |
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echo " MENU LABEL NixOS - Default" |
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else |
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echo " MENU LABEL NixOS - Configuration $tag ($timestamp - $nixosVersion)" |
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fi |
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echo " LINUX ../nixos/$(basename $kernel)" |
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echo " INITRD ../nixos/$(basename $initrd)" |
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echo " FDTDIR ../nixos/$(basename $dtbs)" |
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echo " APPEND systemConfig=$path init=$path/init $extraParams" |
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} |
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tmpFile="$target/extlinux/extlinux.conf.tmp.$$" |
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cat > $tmpFile <<EOF |
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# Generated file, all changes will be lost on nixos-rebuild! |
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# Change this to e.g. nixos-42 to temporarily boot to an older configuration. |
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DEFAULT nixos-default |
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TIMEOUT $timeout |
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$(addEntry $default default) |
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EOF |
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# Add up to $numGenerations generations of the system profile to the menu, |
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# in reverse (most recent to least recent) order. |
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for generation in $( |
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(cd /nix/var/nix/profiles && ls -d system-*-link) \ |
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| sed 's/system-\([0-9]\+\)-link/\1/' \ |
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| sort -n -r \ |
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| head -n $numGenerations); do |
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link=/nix/var/nix/profiles/system-$generation-link |
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addEntry $link $generation |
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done >> $tmpFile |
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mv -f $tmpFile $target/extlinux/extlinux.conf |
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# Remove obsolete files from $target/nixos. |
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for fn in $target/nixos/*; do |
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if ! test "${filesCopied[$fn]}" = 1; then |
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echo "Removing no longer needed boot file: $fn" |
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chmod +w -- "$fn" |
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rm -rf -- "$fn" |
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fi |
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done |
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