nixpkgs/modules/installer/grub/grub-menu-builder.sh
2009-12-16 18:58:34 +00:00

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