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skeleton: optionally wait for network interfaces to appear

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This patch has same purpose than 49964858f45d2243c513e6d362e992ad89ec7a45:

  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.

However, wait-delay hook is enabled only if wait-delay property appears
in /etc/network/interfaces. This patch enable it automaticaly when
interface is configured through DHCP at bootup. But, if user choose
to write /etc/network/interface himself, he have to explicitly
set wait-delay.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Jérôme Pouiller 2015-10-29 10:00:18 +01:00 committed by Thomas Petazzoni
parent 81ece45c3a
commit ccc52c8183
2 changed files with 22 additions and 0 deletions
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1
package/skeleton/skeleton.mk
View File

@ -89,6 +89,7 @@ define SET_NETWORK_DHCP
echo ; \
echo "auto $(NETWORK_DHCP_IFACE)"; \
echo "iface $(NETWORK_DHCP_IFACE) inet dhcp"; \
echo " wait-delay 15"; \
) >> $(TARGET_DIR)/etc/network/interfaces
endef
endif

21
system/skeleton/etc/network/if-pre-up.d/wait_iface Executable file
View File

@ -0,0 +1,21 @@
#!/bin/sh
# 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. IF_WAIT_DELAY is in seconds.
if [ "${IF_WAIT_DELAY}" -a ! -e "/sys/class/net/${IFACE}" ]; then
printf "Waiting for interface %s to appear" "${IFACE}"
while [ ${IF_WAIT_DELAY} -gt 0 ]; do
if [ -e "/sys/class/net/${IFACE}" ]; then
printf "\n"
exit 0
fi
sleep 1
printf "."
: $((IF_WAIT_DELAY -= 1))
done
printf " timeout!\n"
exit 1
fi