[Buildroot] [PATCH v2] system: Fix for NFS booting with interface config via DHCP
Arnout Vandecappelle
arnout at mind.be
Tue Nov 10 22:10:19 UTC 2015
On 09-11-15 23:16, Trent Piepho wrote:
> Configuring the network interface with DHCP via
> /etc/network/interfaces generally does not work when NFS booting. The
> DHCP configuration will initially bring the interface down and system
> then hangs at that point as the root filesystem is no longer
> accessable. See bug 4709.
>
> This adds a script to be run via a pre-up line in
> /etc/network/interfaces. It checks for a NFS root filesystem and if
> the interface to be configured is used for access to the NFS server.
> If this is the case, then it returns a failure code so that ifup will
> not configure the interface. This works for DHCP and another config
> methods (static, bootp, etc.). This system does detect if the
> interface to be configured isn't the one used for NFS and doesn't skip
> it when that is the case.
>
> NFS filesystems that aren't the root fs aren't considered.
>
> Signed-off-by: Trent Piepho <tpiepho at kymetacorp.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
I checked that the addr= appears in /proc/mounts since at least 2.6.17.
IMHO this is still for 2015.11.
Regards,
Arnout
> ---
> package/skeleton/nfs_check | 20 ++++++++++++++++++++
> package/skeleton/skeleton.mk | 3 +++
> 2 files changed, 23 insertions(+)
> create mode 100755 package/skeleton/nfs_check
>
> diff --git a/package/skeleton/nfs_check b/package/skeleton/nfs_check
> new file mode 100755
> index 0000000..dfa0cbf
> --- /dev/null
> +++ b/package/skeleton/nfs_check
> @@ -0,0 +1,20 @@
> +#!/bin/sh
> +
> +# This allows NFS booting to work while also being able to configure
> +# the network interface via DHCP when not NFS booting. Otherwise, a
> +# NFS booted system will likely hang during DHCP configuration.
> +
> +# Attempting to configure the network interface used for NFS will
> +# initially bring that network down. Since the root filesystem is
> +# accessed over this network, the system hangs.
> +
> +# This script is run by ifup and will attempt to detect if a NFS root
> +# mount uses the interface to be configured (IFACE), and if so does
> +# not configure it. This should allow the same build to be disk/flash
> +# booted or NFS booted.
> +
> +nfsip=`sed -n '/^[^ ]*:.* \/ nfs.*[ ,]addr=\([0-9.]\+\).*/s//\1/p' /proc/mounts`
> +if [ -n "$nfsip" ] && ip route get to "$nfsip" | grep -q "dev $IFACE"; then
> + echo Skipping $IFACE, used for NFS from $nfsip
> + exit 1
> +fi
> diff --git a/package/skeleton/skeleton.mk b/package/skeleton/skeleton.mk
> index d1b797d..0cab8a1 100644
> --- a/package/skeleton/skeleton.mk
> +++ b/package/skeleton/skeleton.mk
> @@ -89,8 +89,11 @@ define SET_NETWORK_DHCP
> echo ; \
> echo "auto $(NETWORK_DHCP_IFACE)"; \
> echo "iface $(NETWORK_DHCP_IFACE) inet dhcp"; \
> + echo " pre-up /etc/network/nfs_check"; \
> echo " wait-delay 15"; \
> ) >> $(TARGET_DIR)/etc/network/interfaces
> + $(INSTALL) -m 0755 -D $(SKELETON_PKGDIR)/nfs_check \
> + $(TARGET_DIR)/etc/network/nfs_check
> endef
> endif
>
>
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF
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