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#!/bin/sh
# find given append opt
get_append_opt() {
awk -v search="$1" '
$1 == "append" || $1 == "APPEND" {
split($0, a);
for (i in a) {
if (index(a[i], search) == 1) {
print a[i];
}
}
}' /boot/extlinux.conf | sort | uniq
}
# print default kernel options
get_default_opts() {
awk '
$1 == "append" || $1 == "APPEND" {
opts="";
space="";
split($0, a);
for (i in a) {
if (i != 1 \
&& (index(a[i], "root=") != 1) \
&& (index(a[i], "initrd=") != 1) \
&& (index(a[i], "modules=") != 1)) {
opts = opts space a[i];
space = " ";
}
}
print opts;
}
' /boot/extlinux.conf | sort | uniq
}
if ! [ -f /boot/extlinux.conf ]; then
exit 0
fi
# check if we already have a generated extlinux.conf
if grep -q '^# Generated by update-extlinux' /boot/extlinux.conf; then
exit 0
fi
# try fish out the kernel opts from extlinuix.conf's append line
root=$(get_append_opt 'root=' | head -n 1)
modules=$(get_append_opt 'modules=' | head -n 1)
opts=$(get_default_opts | head -n 1)
# populate update-extlinux.conf with the info we know
if [ -n "$root" ]; then
sed -i -e "/^root=/s|.*|$root|g" /etc/update-extlinux.conf
fi
if [ -n "$modules" ]; then
sed -i -e "/^modules=/s|.*|$modules|g" /etc/update-extlinux.conf
fi
if [ -n "$opts" ]; then
sed -i -e "/^default_kernel_opts=/s|.*|default_kernel_opts=\"$opts\"|g" /etc/update-extlinux.conf
fi
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