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