Add can-dev-mapping-helperjellyfish_9.99.3jellyfish/9.99.39.99.3

Changes:
- Add a can-dev-mapping-helper.sh script and systemd unit to drive
  it, the script checks if the CAN devices specified in the low-can
  configuration file /etc/dev-mapping.conf exist, and if not brings
  up corresponding virtual CAN devices.
- Add a systemd over-ride conf file for agl-service-can-low-level
  that makes can-dev-mapping-helper a dependency. This should ensure
  that the low-can binding always starts even if there are no physical
  CAN hardware devices.
- Added a Before statement to sllin-demo.service to ensure that it
  will run before can-dev-mapping-helper and ensure that lin_config
  can create sllin0 correctly.
- Removed the sllin-demo-virtual systemd unit, as it will no longer
  be required with can-dev-mapping-helper.
- Updated the /var/run paths in sllin-demo.service and associated
  start_lin_demo.sh script to quiet systemd warnings about /var/run
  usage.

Bug-AGL: SPEC-3540

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ife02f75f57ac7bbdee6b02217e2ab657fe8c36e0

1 files changed, 36 insertions, 0 deletions

diff --git a/recipes-apis/agl-service-can-low-level/files/can-dev-mapping-helper.sh b/recipes-apis/agl-service-can-low-level/files/can-dev-mapping-helper.sh
new file mode 100644
index 00000000..c81014f3
--- /dev/null
+++ b/recipes-apis/agl-service-can-low-level/files/can-dev-mapping-helper.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+#
+# Script to bring up CAN interfaces configured in /etc/dev-mapping.conf
+# as vcan interfaces if no physical interface is present.
+#
+
+vcan_up() {
+    if [ -n "$1" ]; then
+        echo "Bringing up $1 as virtual CAN device"
+        ip link add dev $1 type vcan
+        ip link set up $1
+    fi
+}
+
+if [ ! -f /etc/dev-mapping.conf ]; then
+    exit 0
+fi
+
+hs=$(grep ^hs= /etc/dev-mapping.conf |cut -d= -f2 |tr -d '"')
+ls=$(grep ^ls= /etc/dev-mapping.conf |cut -d= -f2 |tr -d '"')
+
+if [ -n "$hs" ]; then
+    echo "Checking $hs"
+    if ! ifconfig $hs >/dev/null 2>&1; then
+        vcan_up $hs
+    fi
+fi
+if [ -n "$ls" -a "$ls" != "$hs" ]; then
+    echo "Checking $ls"
+    if ! ifconfig $ls >/dev/null 2>&1; then
+        vcan_up $ls
+    fi
+fi
+
+exit 0