nixpkgs/installer/grub-menu-builder.sh
Ludovic Courtès 018cb283f2 Fix `grub-menu-builder.sh'.
Previously, since `nullglob' is active, `$(ls /boot/kernels/*)'
would translate into `$(ls)' when `/boot/kernels' is empty, which
would then lead to the removal of all the files under $PWD.

Additionally, if `/boot/kernels' was not empty, `$fn' would contain
only the basename of the files, whereas `$filesCopied' is indexed
by full paths.


svn path=/nixos/trunk/; revision=15548
2009-05-11 11:54:18 +00:00

184 lines
4.6 KiB
Bash

#! @bash@/bin/sh -e
shopt -s nullglob
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin; done
default=$1
if test -z "$1"; then
echo "Syntax: grub-menu-builder.sh <DEFAULT-CONFIG>"
exit 1
fi
bootMount="@bootMount@"
if test -z "$bootMount"; then bootMount=/boot; fi
echo "updating the GRUB menu..."
target=/boot/grub/menu.lst
tmp=$target.tmp
cat > $tmp << GRUBEND
# Automatically generated. DO NOT EDIT THIS FILE!
default 0
timeout 5
GRUBEND
if test -n "@grubSplashImage@"; then
splashLocation=@grubSplashImage@
# Splash images in /nix/store don't seem to work, so copy them.
cp -f $splashLocation /boot/background.xpm.gz
splashLocation="$bootMount/background.xpm.gz"
echo "splashimage $splashLocation" >> $tmp
fi
configurationCounter=0
configurationLimit="@configurationLimit@"
numAlienEntries=`cat <<EOF | egrep '^[[:space:]]*title' | wc -l
@extraGrubEntries@
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="$1"
local dst="/boot/kernels/$(cleanName $src)"
# 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=$dst
}
# 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" = "$default"; then
cp "$kernel" /boot/nixos-kernel
cp "$initrd" /boot/nixos-initrd
cp "$(readlink -f "$path/init")" /boot/nixos-init
cat > /boot/nixos-grub-config <<EOF
title Emergency boot
kernel ${bootMount:-/boot}/nixos-kernel systemConfig=$(readlink -f "$path") init=/boot/nixos-init $(cat "$path/kernel-params")
initrd ${bootMount:-/boot}/nixos-initrd
EOF
fi
if test -n "@copyKernels@"; then
copyToKernelsDir $kernel; kernel=$result
copyToKernelsDir $initrd; initrd=$result
fi
if test -n "$bootMount"; then
kernel=$(echo $kernel | sed -e "s^/boot^$bootMount^")
initrd=$(echo $initrd | sed -e "s^/boot^$bootMount^")
fi
local confName=$(if test -e $path/configuration-name; then
cat $path/configuration-name;
fi)
if test -n "$confName"; then
name="$confName $3"
fi
cat >> $tmp << GRUBEND
title $name
kernel $kernel systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) $(cat $path/kernel-params)
initrd $initrd
GRUBEND
}
if test -n "@copyKernels@"; then
mkdir -p /boot/kernels
fi
# Additional entries specified verbatim by the configuration.
extraGrubEntries=`cat <<EOF
@extraGrubEntries@
EOF`
if test -n "@extraGrubEntriesBeforeNixos@"; then
echo "$extraGrubEntries" >> $tmp
fi
addEntry "NixOS - Default" $default ""
if test -z "@extraGrubEntriesBeforeNixos@"; then
echo "$extraGrubEntries" >> $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 $default/fine-tune/* ) | sort -n); do
date=$(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 /boot/grub/menu.lst. !!! should do an fsync()
# here on $tmp, especially on ext4.
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