[__unpack] add parameter --tar-extra-args

cdist/conf/type/__unpack/gencode-remote

@@ -23,6 +23,13 @@ case "$src" in
 
             cmd="$cmd --strip-components=$tar_strip"
         fi
+
+        if [ -f "$__object/parameter/tar-extra-args" ]
+        then
+            tar_extra_args="$( cat "$__object/parameter/tar-extra-args" )"
+
+            cmd="$cmd $tar_extra_args"
+        fi
     ;;
     *.7z)
         case "$os" in

cdist/conf/type/__unpack/man.rst

@@ -33,6 +33,10 @@ sum-file
 tar-strip
     Tarball specific. See ``man tar`` for ``--strip-components``.
 
+tar-extra-args
+    Tarball sepcific. Append additional arguments to ``tar`` command.
+    See ``man tar`` for possible arguments.
+
 
 OPTIONAL BOOLEAN PARAMETERS
 ---------------------------
@@ -65,6 +69,13 @@ EXAMPLES
             --preserve-archive \
             --destination /opt/cpma/server
 
+    # example usecase for --tar-* args
+    __unpack /root/strelaysrv.tar.gz \
+        --preserve-archive \
+        --destination /usr/local/bin \
+        --tar-strip 1 \
+        --tar-extra-args '--wildcards "*/strelaysrv"'
+
 
 AUTHORS
 -------

cdist/conf/type/__unpack/parameter/optional

@@ -1,2 +1,3 @@
 sum-file
 tar-strip
+tar-extra-args