[Buildroot] [git commit] package/initscripts: S40network: wait for network interfaces to appear
Peter Korsgaard
peter at korsgaard.com
Fri Oct 16 07:16:58 UTC 2015
commit: http://git.buildroot.net/buildroot/commit/?id=49964858f45d2243c513e6d362e992ad89ec7a45
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master
On some machines, the network interface is slow to appear. For example,
on the Raspberry Pi, the network interface eth0 is an ethernet-over-USB,
and our standard boot process is too fast, so our network startup script
is called before the USB bus is compeltely enumerated, thus it can't
configure eth0.
Closes #8116.
[Peter: move to S40network, handle multiple interfaces]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
package/initscripts/init.d/S40network | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/package/initscripts/init.d/S40network b/package/initscripts/init.d/S40network
index 7b11d8b..a8d7c5d 100755
--- a/package/initscripts/init.d/S40network
+++ b/package/initscripts/init.d/S40network
@@ -6,8 +6,37 @@
# Debian ifupdown needs the /run/network lock directory
mkdir -p /run/network
+# In case we have a slow-to-appear interface (e.g. eth-over-USB),
+# and we need to configure it, wait until it appears, but not too
+# long either. WAIT_DELAY is in seconds.
+WAIT_DELAY=15
+
+wait_for_interfaces() {
+ IFACES=$(awk '/^auto/ { print $2 }' /etc/network/interfaces)
+ [ -n "$IFACES" ] || return
+
+ printf "Waiting for network interfaces to appear"
+
+ for i in $(seq $WAIT_DELAY); do
+ for IFACE in $IFACES; do
+ if [ ! -e "/sys/class/net/$IFACE" ]; then
+ printf "."
+ sleep 1
+ continue 2
+ fi
+ done
+
+ printf " ok\n"; return
+ done
+
+ printf " timeout\n"
+ exit 1
+}
+
case "$1" in
start)
+ wait_for_interfaces
+
echo "Starting network..."
/sbin/ifup -a
;;
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