blob: 973ea9a60869b018ea4d4b6e4a7f7096f259011d [file] [log] [blame]
# Usage:
# kernopt [names...]
# Prints exactly one line containing the value for each "name." We read
# /proc/cmdline and parse all the key=value pairs, printing the 'value' part
# if an entry exists where key=name. If the "=value" part is missing, the
# value is 1. If there is no matching key, the value is the empty string.
# We also look in the environment variable KERNEL_EXTRA for additional
# options that take precedence over /proc/cmdline. This is mostly to allow
# easier testing of scripts that call this one without rebooting over and
# over.
for want in "$@"; do
# This would be easier with sed, but our rootfs currently doesn't have sed.
# So we do this slightly insane loop to split on both lines and words.
while read line; do
echo "$line"
done </proc/cmdline
} | {
while read line; do
set -- $line
for i in "$@"; do
echo "$i"
} | {
while IFS== read key value; do
[ "$key" = "$want" ] && echo "${value:=1}" && exit 0
echo # default value