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package/busybox: add init script for sysctl

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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>
This commit is contained in:
Carlos Santos 2019-05-01 20:11:40 -03:00 committed by Peter Korsgaard
parent c3ebde5ced
commit 398c1af1d5
2 changed files with 78 additions and 0 deletions
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66
package/busybox/S02sysctl Normal file
View file

@ -0,0 +1,66 @@
#!/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

12
package/busybox/busybox.mk
View file

@ -260,6 +260,17 @@ define BUSYBOX_INSTALL_LOGGING_SCRIPT
endef
endif
# Only install our sysctl scripts if no other package does it.
ifeq ($(BR2_PACKAGE_PROCPS_NG),)
define BUSYBOX_INSTALL_SYSCTL_SCRIPT
if grep -q CONFIG_BB_SYSCTL=y $(@D)/.config; \
then \
$(INSTALL) -m 0755 -D package/busybox/S02sysctl \
$(TARGET_DIR)/etc/init.d/S02sysctl ; \
fi
endef
endif
ifeq ($(BR2_INIT_BUSYBOX),y)
define BUSYBOX_INSTALL_INITTAB
$(INSTALL) -D -m 0644 package/busybox/inittab $(TARGET_DIR)/etc/inittab
@ -341,6 +352,7 @@ define BUSYBOX_INSTALL_INIT_SYSV
$(BUSYBOX_INSTALL_MDEV_SCRIPT)
$(BUSYBOX_INSTALL_LOGGING_SCRIPT)
$(BUSYBOX_INSTALL_WATCHDOG_SCRIPT)
$(BUSYBOX_INSTALL_SYSCTL_SCRIPT)
$(BUSYBOX_INSTALL_TELNET_SCRIPT)
$(BUSYBOX_INSTALL_INDIVIDUAL_BINARIES)
endef