[ptxdist] [PATCH 2/3] rc-once: Use readlink to check where /system-update points to.

[Gavin Schenk <g.schenk@eckelmann.de>]

rc-once ist based on systemd offline update mechanism.
https://www.freedesktop.org/software/systemd/man/systemd.offline-updates

To make it possible to have multiple update services beside rc-once the
script should check where the link /system-update points to.

rc-once will only run if the link points to etc/rc-once.d or
/etc/rc-once.d.

Signed-off-by: Gavin Schenk <g.schenk@eckelmann.de>
---
 projectroot/usr/lib/init/rc-once.sh | 5 +++++
 rules/rc-once.in                    | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/projectroot/usr/lib/init/rc-once.sh b/projectroot/usr/lib/init/rc-once.sh
index 8689a32bc..d225ad5c2 100644
--- a/projectroot/usr/lib/init/rc-once.sh
+++ b/projectroot/usr/lib/init/rc-once.sh
@@ -6,6 +6,11 @@ STAMP="$DONE_DIR/rc-once"
 
 run_rc_once() {
 	failed=0
+	UPDATE_TARGET=$(readlink -f /system-update)
+	if [ "$UPDATE_TARGET" != '/etc/rc.once.d' -a "$UPDATE_TARGET" != 'etc/rc.once.d' ]; then
+		echo "skipping rc.once.d services..."
+		return $failed
+	fi
 	echo "running rc.once.d services..."
 	cd "$RC_ONCE_DIR" || exit 1
 	mkdir -p "$DONE_DIR"
diff --git a/rules/rc-once.in b/rules/rc-once.in
index 849c71f06..6db4a02fc 100644
--- a/rules/rc-once.in
+++ b/rules/rc-once.in
@@ -3,6 +3,9 @@
 config RC_ONCE
 	tristate
 	prompt "rc.once"
+	select BUSYBOX_FEATURE_READLINK_FOLLOW	if BUSYBOX_READLINK
+	select COREUTILS			if !BUSYBOX_READLINK
+	select COREUTILS_READLINK		if !BUSYBOX_READLINK
 	help
 	  Some services need a one time initialization when the system starts
 	  up the first time after creating and installing the root filesystem.
-- 
2.13.0


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Vorstand: Dipl.-Ing. Peter Frankenbach (Sprecher) Dipl.-Wi.-Ing. Philipp Eckelmann
Dr.-Ing. Marco Münchhof Dr.-Ing. Frank Uhlemann
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Stv. Vorsitzender des Aufsichtsrats: Dr.-Ing. Gerd Eckelmann
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http://www.eckelmann.de 


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