398c1af1d5
Add a simple init script that invokes sysctl early in the initialization
process to configure kernel parameters. This is already performed by
systemd (systemd-sysctl) but there is no sysvinit/busybox counterpart.
Files are read from directories in the following list in the given order
from top to bottom:
/run/sysctl.d/*.conf
/etc/sysctl.d/*.conf
/usr/local/lib/sysctl.d/*.conf
/usr/lib/sysctl.d/*.conf
/lib/sysctl.d/*.conf
/etc/sysctl.conf
A file may be used more than once, since there can be multiple symlinks
to it. No attempt is made to prevent this.
Signed-off-by: Carlos Santos <unixmania@gmail.com>
Reviewed-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
67 lines
1.8 KiB
Bash
67 lines
1.8 KiB
Bash
#!/bin/sh
|
|
|
|
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"
|
|
|
|
# Use some scripting to mimic the --system option of the sysctl provided by
|
|
# procps-ng but still reporting errors. Users not interested on error report
|
|
# can put "-e" in SYSCTL_ARGS.
|
|
#
|
|
# 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.
|
|
#
|
|
# Testing the sysctl exit code is fruitless, as at the moment, since it ends
|
|
# with status zero even if errors happen. Hopefully this will be fixed in a
|
|
# future version of Busybox.
|
|
#
|
|
run_program() {
|
|
# shellcheck disable=SC2086 # we need the word splitting
|
|
find $SYSCTL_SOURCES -maxdepth 1 -name '*.conf' -print0 2> /dev/null | \
|
|
xargs -0 -r -n 1 readlink -f | {
|
|
prog_status="OK"
|
|
while :; do
|
|
read -r file
|
|
if [ -z "$file" ]; then
|
|
echo "$prog_status" >&4
|
|
break
|
|
fi
|
|
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
|
|
}
|
|
|
|
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
|