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| author | Mike Frysinger <vapier@gentoo.org> | 2013-02-27 01:01:43 -0500 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2013-02-27 01:01:43 -0500 |
| commit | 39b8fb41c50e6ee0aaca81cde2a4dec98d45ef9a (patch) | |
| tree | 44f4d1a9b44bbaf98e28e94d8c20c784e5882f63 | |
| parent | 40b97fb31ec7c24db706b47182f400f2a13dbbfc (diff) | |
| download | busybox-39b8fb41c50e6ee0aaca81cde2a4dec98d45ef9a.tar.gz | |
udhcpc: support resolv.conf symlinks
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>
| -rwxr-xr-x | examples/udhcp/simple.script | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/examples/udhcp/simple.script b/examples/udhcp/simple.script index 40ee73822..d42f2d3d5 100755 --- a/examples/udhcp/simple.script +++ b/examples/udhcp/simple.script @@ -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 |