airgap/rootfs/etc/init.d/S02sysctl

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2024-06-18 08:45:21 +00:00
#!/bin/sh
#
# This script is used by busybox and procps-ng.
#
# With procps-ng, the "--system" option of sysctl also enables "--ignore", so
# errors are not reported via syslog. Use the run_logger function to mimic the
# --system behavior, still reporting errors via syslog. Users not interested
# on error reports can add "-e" to SYSCTL_ARGS.
#
# busybox does not have a "--system" option neither reports errors via syslog,
# so the scripting provides a consistent behavior between the implementations.
# Testing the busybox sysctl exit code is fruitless, as at the moment, since
# its exit status is zero even if errors happen. Hopefully this will be fixed
# in a future busybox version.
PROGRAM="sysctl"
SYSCTL_ARGS=""
# shellcheck source=/dev/null
[ -r "/etc/default/$PROGRAM" ] && . "/etc/default/$PROGRAM"
# Files are read from directories in the SYSCTL_SOURCES list, in the given
# order. A file may be used more than once, since there can be multiple
# symlinks to it. No attempt is made to prevent this.
SYSCTL_SOURCES="/etc/sysctl.d/ /usr/local/lib/sysctl.d/ /usr/lib/sysctl.d/ /lib/sysctl.d/ /etc/sysctl.conf"
# If the logger utility is available all messages are sent to syslog, except
# for the final status. The file redirections do the following:
#
# - stdout is redirected to syslog with facility.level "kern.info"
# - stderr is redirected to syslog with facility.level "kern.err"
# - file dscriptor 4 is used to pass the result to the "start" function.
#
run_logger() {
# shellcheck disable=SC2086 # we need the word splitting
find $SYSCTL_SOURCES -maxdepth 1 -name '*.conf' -print0 2> /dev/null | \
xargs -0 -r -n 1 readlink -f | {
prog_status="OK"
while :; do
read -r file || {
echo "$prog_status" >&4
break
}
echo "* Applying $file ..."
/sbin/sysctl -p "$file" $SYSCTL_ARGS || prog_status="FAIL"
done 2>&1 >&3 | /usr/bin/logger -t sysctl -p kern.err
} 3>&1 | /usr/bin/logger -t sysctl -p kern.info
}
# If logger is not available all messages are sent to stdout/stderr.
run_std() {
# shellcheck disable=SC2086 # we need the word splitting
find $SYSCTL_SOURCES -maxdepth 1 -name '*.conf' -print0 2> /dev/null | \
xargs -0 -r -n 1 readlink -f | {
prog_status="OK"
while :; do
read -r file || {
echo "$prog_status" >&4
break
}
echo "* Applying $file ..."
/sbin/sysctl -p "$file" $SYSCTL_ARGS || prog_status="FAIL"
done
}
}
if [ -x /usr/bin/logger ]; then
run_program="run_logger"
else
run_program="run_std"
fi
start() {
printf '%s %s: ' "$1" "$PROGRAM"
status=$("$run_program" 4>&1)
echo "$status"
if [ "$status" = "OK" ]; then
return 0
fi
return 1
}
case "$1" in
start)
start "Running";;
restart|reload)
start "Rerunning";;
stop)
:;;
*)
echo "Usage: $0 {start|stop|restart|reload}"
exit 1
esac