[__line] Ensure the line is only added once

cdist/conf/type/__line/explorer/state

@@ -18,6 +18,17 @@
 # along with cdist. If not, see <http://www.gnu.org/licenses/>.
 #
 
+if [ -f "$__object/parameter/file" ]; then
+   file="$(cat "$__object/parameter/file")"
+else
+   file="/$__object_id"
+fi
+
+if [ ! -f "$file" ]; then
+  echo "file_missing"
+  exit 0
+fi
+
 if [ -f "$__object/parameter/before" ]; then
    position="before"
 elif [ -f "$__object/parameter/after" ]; then
@@ -33,17 +44,6 @@ else
    needle="line"
 fi
 
-if [ -f "$__object/parameter/file" ]; then
-   file="$(cat "$__object/parameter/file")"
-else
-   file="/$__object_id"
-fi
-
-if [ ! -f "$file" ]; then
-  echo "file_missing"
-  exit 0
-fi
-
 awk -v position="$position" -v needle="$needle" '
 function _find(_text, _pattern) {
    if (needle == "regex") {

cdist/conf/type/__line/gencode-remote

@@ -1,6 +1,7 @@
 #!/bin/sh -e
 #
 # 2018 Steven Armstrong (steven-cdist at armstrong.cc)
+# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
 #
 # This file is part of cdist.
 #
@@ -104,10 +105,12 @@ BEGIN {
       if (anchor && match(\$0, anchor)) {
          if (position == "before") {
             print line
+            add = 0
             print
          } else if (position == "after") {
             print
             print line
+            add = 0
          }
          next
       }