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udhcpc: support resolv.conf symlinks

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Often it is desirable to have /etc/ be on read-only storage (well, the
whole rootfs) but have things like /etc/resolv.conf be symlinks to a
writable location.  Tweak the simple script to support that.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2013-02-27 01:01:43 -05:00
parent 40b97fb31e
commit 39b8fb41c5
1 changed files with 8 additions and 4 deletions
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12
examples/udhcp/simple.script
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@ -34,13 +34,17 @@ case "$1" in
fi
echo "Recreating $RESOLV_CONF"
echo -n > $RESOLV_CONF-$$
[ -n "$domain" ] && echo "search $domain" >> $RESOLV_CONF-$$
# If the file is a symlink somewhere (like /etc/resolv.conf
# pointing to /run/resolv.conf), make sure things work.
realconf=$(realpath "$RESOLV_CONF" 2>/dev/null || echo "$RESOLV_CONF")
tmpfile="$realconf-$$"
> "$tmpfile"
[ -n "$domain" ] && echo "search $domain" >> "$tmpfile"
for i in $dns ; do
echo " Adding DNS server $i"
echo "nameserver $i" >> $RESOLV_CONF-$$
echo "nameserver $i" >> "$tmpfile"
done
mv $RESOLV_CONF-$$ $RESOLV_CONF
mv "$tmpfile" "$realconf"
;;
esac