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Commit ea8778f5 authored by Alessandro Rubini's avatar Alessandro Rubini
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dot-config: retrieve dot-config at run time, if so configured 

Now /etc/init.d/S20dot-config is able to download a new dot-config
file if the user specified an URL at configuration time.

We support tftp, http and ftp.  Full documentation in next commit.
Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 95436237
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Kconfig
View file @ ea8778f5
......@@ -21,6 +21,20 @@ config PPSI
menu "Local configuration"
config DOTCONF_URL
string "URL for a run-time replacement of dot-config"
help
The White Rabbit Switch is configured at run-time,
according to a dot-config .config file. The file
is the same .config you are defining now. If you
select an empty string, dot-config is not replaced
at run time. Otherwise, tftp://, ftp:// or http://
URLs are allowed. Names are allowed if you configured
a DNS server. The special strings IPADDR and MACADDR
are substituted before retrieving the file.
Example: "tftp//morgana/wrs-config-IPADDR"
config NTP_SERVER
string "IP address of local NTP server (empty for none)"
help
......
userspace/rootfs_override/etc/init.d/S20dot-config
View file @ ea8778f5
......@@ -5,4 +5,49 @@
# could edit dot-config and run /wr/bin/apply_dot-config like we do here,
# without the need to rember wheter this is S20 or S10 during boot.
. /wr/bin/apply_dot-config
\ No newline at end of file
# First, read dot-config to get the new location, if any.
if [ -f /wr/etc/dot-config ]; then
. /wr/etc/dot-config
fi
# Create /etc/resolv.conf, so we can use it. /etc is ramdisk anyways
if [ ! -z "$CONFIG_DNS_SERVER" ]; then
echo "nameserver $CONFIG_DNS_SERVER" > /etc/resolv.conf
if [ ! -z "$CONFIG_DNS_DOMAIN" ]; then
echo "domain $CONFIG_DNS_DOMAIN" >> /etc/resolv.conf
fi
fi
# If we are expected to get a new dot-conf, do it
if [ -n "$CONFIG_DOTCONF_URL" ]; then
# replace IPADDR and MACADDR, to have a device-specific name
macaddr=$(cat /sys/class/net/eth0/address)
ipaddr=$(ifconfig eth0 | grep inet | cut -d: -f 2 | cut '-d ' -f 1)
URL=$(echo $CONFIG_DOTCONF_URL | \
sed -e s/MACADDR/$macaddr/ -e s/IPADDR/$ipaddr/)
# split the parts, as we need to handle tftp by hand
proto=$(echo $URL | cut -d: -f 1)
host=$(echo $URL | cut -d/ -f 3)
filename=$(echo $URL | cut -d/ -f 4-)
rm -f /tmp/dot-config
case $proto in
http|ftp)
wget $URL -O /tmp/dot-config
;;
tftp)
tftp -g -r "$filename" -l /tmp/dot-config $host
;;
*)
echo "Invalid URL for dot-config: \"$URL\"" >& 2
;;
esac
# If it exists and it is not empty or awfully small, trust it
if [ -f /tmp/dot-config ] &&
[ $(cat /tmp/dot-config | wc -c) -gt 200 ]; then
mv /tmp/dot-config /wr/etc
fi
fi
# Finally, apply what we have, be it old or new
. /wr/bin/apply_dot-config
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