Directory structure flattened during packaging for full paths

[mschwan-phytec]

Description

When running partup package with a full path to a file, the directories to that file are stripped. However, it is expected for the relative path to be preserved.

The following example shows the directory foo/ being (falsely) stripped:

$ partup package test.partup layout.yaml foo/bar.txt
$ sudo partup show test.partup
...
Package Contents
================
bar.txt
layout.yaml

When passing a directory as input, the output is as expected:

$ partup package test.partup layout.yaml foo/
$ sudo partup show test.partup
...
Package Contents
================
foo/
foo/bar.txt
layout.yaml

Expected behavior

When passing relative path including directories, these directories should be preserved/passed through to the package content.

[landerweit-phytec]

I think we should solve this with a new destination mapping for inputs.

input:
      - filename: bar.txt
      - destination: foo/bar.txt

This would also allow renaming a file.