272 lines
7 KiB
Bash
272 lines
7 KiB
Bash
#! @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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if test $# -ne 1; then
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echo "Usage: grub-menu-builder.sh DEFAULT-CONFIG"
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exit 1
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fi
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grubVersion="@version@"
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defaultConfig="$1"
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case "$grubVersion" in
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1|2)
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echo "updating GRUB $grubVersion menu..."
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;;
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*)
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echo "Unsupported GRUB version \`$grubVersion'" >&2
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echo "Supported versions are \`1' (GRUB Legacy) and \`2' (GRUB 1.9x)." >&2
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exit 1
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;;
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esac
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# Discover whether /boot is on the same filesystem as / and
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# /nix/store. If not, then all kernels and initrds must be copied to
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# /boot, and all paths in the GRUB config file must be relative to the
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# root of the /boot filesystem. `$bootRoot' is the path to be
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# prepended to paths under /boot.
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if [ "$(stat -c '%D' /.)" != "$(stat -c '%D' /boot/.)" ]; then
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bootRoot=
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copyKernels=1
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elif [ "$(stat -c '%D' /boot/.)" != "$(stat -c '%D' /nix/store/.)" ]; then
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bootRoot=/boot
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copyKernels=1
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else
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bootRoot=/boot
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copyKernels="@copyKernels@" # user can override in the NixOS config
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fi
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prologue() {
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case "$grubVersion" in
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1)
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cp -f "@splashImage@" /boot/background.xpm.gz
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cat > "$1" << GRUBEND
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# Automatically generated. DO NOT EDIT THIS FILE!
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default @default@
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timeout @timeout@
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GRUBEND
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if test -n "@splashImage@"; then
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echo "splashimage $bootRoot/background.xpm.gz" >> "$1"
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fi
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;;
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2)
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cp -f @grub@/share/grub/unicode.pf2 /boot/grub/unicode.pf2
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cat > "$1" <<EOF
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# Automatically generated. DO NOT EDIT THIS FILE!
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set default=@default@
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set timeout=@timeout@
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if loadfont $bootRoot/grub/unicode.pf2; then
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set gfxmode=640x480
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insmod gfxterm
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insmod vbe
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terminal_output gfxterm
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fi
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EOF
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if test -n "@splashImage@"; then
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cp -f "@splashImage@" /boot/background.png
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# FIXME: GRUB 1.97 doesn't resize the background image
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# if it doesn't match the video resolution.
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cat >> "$1" <<EOF
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insmod png
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if background_image $bootRoot/background.png; then
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set color_normal=white/black
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set color_highlight=black/white
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else
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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EOF
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fi
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;;
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esac
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}
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case "$grubVersion" in
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1) target="/boot/grub/menu.lst";;
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2) target="/boot/grub/grub.cfg";;
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esac
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tmp="$target.tmp"
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prologue "$tmp"
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configurationCounter=0
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configurationLimit="@configurationLimit@"
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numAlienEntries=`cat <<EOF | egrep '^[[:space:]]*title' | wc -l
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@extraEntries@
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EOF`
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if test $((configurationLimit+numAlienEntries)) -gt 190; then
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configurationLimit=$((190-numAlienEntries));
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fi
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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 /boot/kernels.
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declare -A filesCopied
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copyToKernelsDir() {
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local src="$1"
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local p="kernels/$(cleanName $src)"
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local dst="/boot/$p"
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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 $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="$bootRoot/$p"
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}
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# Add an entry for a configuration to the Grub menu, and if
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# appropriate, copy its kernel and initrd to /boot/kernels.
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addEntry() {
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local name="$1"
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local path="$2"
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local shortSuffix="$3"
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configurationCounter=$((configurationCounter + 1))
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if test $configurationCounter -gt @configurationLimit@; then
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return
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fi
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if ! test -e $path/kernel -a -e $path/initrd; then
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return
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fi
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local kernel=$(readlink -f $path/kernel)
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local initrd=$(readlink -f $path/initrd)
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local xen=$([ -f $path/xen.gz ] && readlink -f $path/xen.gz)
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if test "$path" = "$defaultConfig"; then
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cp "$kernel" /boot/nixos-kernel
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cp "$initrd" /boot/nixos-initrd
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cp "$(readlink -f "$path/init")" /boot/nixos-init
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case "$grubVersion" in
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1)
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cat > /boot/nixos-grub-config <<EOF
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title Emergency boot
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kernel $bootRoot/nixos-kernel systemConfig=$(readlink -f "$path") init=/boot/nixos-init $(cat "$path/kernel-params")
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initrd $bootRoot/nixos-initrd
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EOF
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;;
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2)
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cat > /boot/nixos-grub-config <<EOF
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menuentry "Emergency boot" {
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linux $bootRoot/nixos-kernel systemConfig=$(readlink -f "$path") init=/boot/nixos-init $(cat "$path/kernel-params")
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initrd $bootRoot/initrd
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}
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EOF
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;;
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esac
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fi
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if test -n "$copyKernels"; then
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copyToKernelsDir $kernel; kernel=$result
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copyToKernelsDir $initrd; initrd=$result
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if [ -n "$xen" ]; then copyToKernelsDir $xen; xen=$result; fi
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fi
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local confName=$(cat $path/configuration-name 2>/dev/null || true)
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if test -n "$confName"; then
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name="$confName $3"
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fi
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local kernelParams="systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) $(cat $path/kernel-params)"
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local xenParams="$([ -n "$xen" ] && cat $path/xen-params)"
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case "$grubVersion" in
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1)
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cat >> "$tmp" << GRUBEND
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title $name
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@extraPerEntryConfig@
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${xen:+kernel $xen $xenParams}
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$(if [ -z "$xen" ]; then echo kernel; else echo module; fi) $kernel $kernelParams
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$(if [ -z "$xen" ]; then echo initrd; else echo module; fi) $initrd
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GRUBEND
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;;
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2)
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cat >> "$tmp" << GRUBEND
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menuentry "$name" {
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@extraPerEntryConfig@
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${xen:+multiboot $xen $xenParams}
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$(if [ -z "$xen" ]; then echo linux; else echo module; fi) $kernel $kernelParams
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$(if [ -z "$xen" ]; then echo initrd; else echo module; fi) $initrd
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}
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GRUBEND
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;;
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esac
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}
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if test -n "$copyKernels"; then
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mkdir -p /boot/kernels
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fi
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# Additional entries specified verbatim by the configuration.
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extraEntries=`cat <<EOF
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@extraEntries@
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EOF`
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cat >> $tmp <<EOF
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@extraConfig@
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EOF
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if test -n "@extraEntriesBeforeNixOS@"; then
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echo "$extraEntries" >> $tmp
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fi
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addEntry "NixOS - Default" $defaultConfig ""
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if test -z "@extraEntriesBeforeNixOS@"; then
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echo "$extraEntries" >> $tmp
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fi
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# Add all generations of the system profile to the menu, in reverse
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# (most recent to least recent) order.
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for link in $((ls -d $defaultConfig/fine-tune/* ) | sort -n); do
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date=$(stat --printf="%y\n" $link | sed 's/\..*//')
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addEntry "NixOS - variation" $link ""
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done
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for generation in $(
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(cd /nix/var/nix/profiles && for i in system-*-link; do echo $i; done) \
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| sed 's/system-\([0-9]\+\)-link/\1/' \
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| sort -n -r); do
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link=/nix/var/nix/profiles/system-$generation-link
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date=$(stat --printf="%y\n" $link | sed 's/\..*//')
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kernelVersion=$(cd $(dirname $(readlink -f $link/kernel))/lib/modules && echo *)
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addEntry "NixOS - Configuration $generation ($date - $kernelVersion)" $link "$generation ($date)"
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done
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# Atomically update the GRUB configuration file.
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mv $tmp $target
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# Remove obsolete files from /boot/kernels.
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for fn in /boot/kernels/*; do
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if ! test "${filesCopied[$fn]}" = 1; then
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rm -vf -- "$fn"
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fi
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done
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