Merge pull request #1764 from chrisnovakovic/initramfs-enable-dns

initramfs: enable DNS if network is up

packages/devel/glibc/config/nsswitch-init.conf

@@ -0,0 +1,3 @@
+# This is just enough to get DNS resolution working in the initramfs
+
+hosts:		dns

packages/devel/glibc/package.mk

@@ -159,7 +159,7 @@ post_makeinstall_target() {
 
 # create default configs
   mkdir -p $INSTALL/etc
-    cp $PKG_DIR/config/nsswitch.conf $INSTALL/etc
+    cp $PKG_DIR/config/nsswitch-target.conf $INSTALL/etc/nsswitch.conf
     cp $PKG_DIR/config/host.conf $INSTALL/etc
     cp $PKG_DIR/config/gai.conf $INSTALL/etc
 
@@ -184,8 +184,16 @@ makeinstall_init() {
     cp -PR $PKG_BUILD/.$TARGET_NAME/math/libm.so* $INSTALL/usr/lib
     cp -PR $PKG_BUILD/.$TARGET_NAME/nptl/libpthread.so* $INSTALL/usr/lib
     cp -PR $PKG_BUILD/.$TARGET_NAME/rt/librt.so* $INSTALL/usr/lib
+    cp -PR $PKG_BUILD/.$TARGET_NAME/resolv/libnss_dns.so* $INSTALL/usr/lib
+    cp -PR $PKG_BUILD/.$TARGET_NAME/resolv/libresolv.so* $INSTALL/usr/lib
 
     if [ "$TARGET_ARCH" = "arm" -a "$TARGET_FLOAT" = "hard" ]; then
       ln -sf ld.so $INSTALL/usr/lib/ld-linux.so.3
     fi
 }
+
+post_makeinstall_init() {
+# create default configs
+  mkdir -p $INSTALL/etc
+    cp $PKG_DIR/config/nsswitch-init.conf $INSTALL/etc/nsswitch.conf
+}

packages/sysutils/busybox/scripts/init

@@ -1003,6 +1003,10 @@
     [ -f "/sysroot/usr/lib/systemd/systemd" ] || error "final_check" "Could not find systemd!"
   }
 
+  # If the network is up (due to the use of the "ip" kernel parameter) and a DNS
+  # server is known, allow the libc resolver to use it
+  grep '^\(nameserver\|domain\) ' /proc/net/pnp | grep -v '^nameserver 0\.0\.0\.0$' > /etc/resolv.conf
+
   if [ "${boot%%=*}" = "FILE" ]; then
     error "check arguments" "boot argument can't be FILE type..."
   fi