git.ipfire.org Git - thirdparty/openembedded/openembedded-core-contrib.git/blob

   1 From 02acc4d875ee81e6fd19ef66d69c9f55b4b4a7e7 Mon Sep 17 00:00:00 2001
   2 From: Chen Qi <Qi.Chen@windriver.com>
   3 Date: Wed, 9 Nov 2022 16:33:18 +0800
   4 Subject: [PATCH] 20-resolv.conf: improve the sitation of working with systemd
   5
   6 systemd's resolvconf implementation ignores the protocol part.
   7 See https://github.com/systemd/systemd/issues/25032.
   8
   9 When using 'dhcp server + dns server + dhcpcd + systemd', we
  10 get an integration issue, that is dhcpcd runs 'resolvconf -d eth0.ra',
  11 yet systemd's resolvconf treats it as eth0. This will delete the
  12 DNS information set by 'resolvconf -a eth0.dhcp'.
  13
  14 Fortunately, 20-resolv.conf has the ability to build the resolv.conf
  15 file contents itself. We can just pass the generated contents to
  16 systemd's resolvconf. This way, the DNS information is not incorrectly
  17 deleted. Also, it does not cause behavior regression for dhcpcd
  18 in other cases.
  19
  20 Upstream-Status: Inappropriate [OE Specific]
  21 This patch has been rejected by dhcpcd upstream.
  22 See details in https://github.com/NetworkConfiguration/dhcpcd/pull/152
  23
  24 Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
  25 ---
  26  hooks/20-resolv.conf | 17 +++++++++++++----
  27  1 file changed, 13 insertions(+), 4 deletions(-)
  28
  29 diff --git a/hooks/20-resolv.conf b/hooks/20-resolv.conf
  30 index 7c29e276..becc019f 100644
  31 --- a/hooks/20-resolv.conf
  32 +++ b/hooks/20-resolv.conf
  33 @@ -11,8 +11,12 @@ nocarrier_roaming_dir="$state_dir/roaming"
  34  NL="
  35  "
  36  : ${resolvconf:=resolvconf}
  37 +resolvconf_from_systemd=false
  38  if command -v "$resolvconf" >/dev/null 2>&1; then
  39         have_resolvconf=true
  40 +       if [ $(basename $(readlink -f $(which $resolvconf))) = resolvectl ]; then
  41 +               resolvconf_from_systemd=true
  42 +       fi
  43  else
  44         have_resolvconf=false
  45  fi
  46 @@ -69,8 +73,13 @@ build_resolv_conf()
  47         else
  48                 echo "# /etc/resolv.conf.tail can replace this line" >> "$cf"
  49         fi
  50 -       if change_file /etc/resolv.conf "$cf"; then
  51 -               chmod 644 /etc/resolv.conf
  52 +       if $resolvconf_from_systemd; then
  53 +               [ -n "$ifmetric" ] && export IF_METRIC="$ifmetric"
  54 +               "$resolvconf" -a "$ifname" <"$cf"
  55 +       else
  56 +               if change_file /etc/resolv.conf "$cf"; then
  57 +                       chmod 644 /etc/resolv.conf
  58 +               fi
  59         fi
  60         rm -f "$cf"
  61  }
  62 @@ -170,7 +179,7 @@ add_resolv_conf()
  63         for x in ${new_domain_name_servers}; do
  64                 conf="${conf}nameserver $x$NL"
  65         done
  66 -       if $have_resolvconf; then
  67 +       if $have_resolvconf && ! $resolvconf_from_systemd; then
  68                 [ -n "$ifmetric" ] && export IF_METRIC="$ifmetric"
  69                 printf %s "$conf" | "$resolvconf" -a "$ifname"
  70                 return $?
  71 @@ -186,7 +195,7 @@ add_resolv_conf()
  72
  73  remove_resolv_conf()
  74  {
  75 -       if $have_resolvconf; then
  76 +       if $have_resolvconf && ($if_down || ! $resolvconf_from_systemd); then
  77                 "$resolvconf" -d "$ifname" -f
  78         else
  79                 if [ -e "$resolv_conf_dir/$ifname" ]; then
  80 --
  81 2.17.1
  82