[ptxdist] Root filesystem creation regression

[Juergen Borleis <jbe@pengutronix.de>]

Hi,

since commit 9c0ec1da583f32706372d2a6cefa9a05f77ee8d2
  "ptxd_lib_check_dir_permissions: also check parents for directories"

the "install_tree" macro may create directories which makes this test fail and 
I'm unable to create root filesystems anymore.

The problem pops up if "install_tree" tries to install a file to a directory 
which has different permissions than the usual ones (0775, root:root).

For example: "systemd" sets up the "/usr/share/dbus-1/system-services" with 
permissions 0755. If my own package tries to add another file to this directory 
the corresponding "install" tool in the install stage creates the whole path 
with standard 0755 permissions - because the "filesystem" in the package 
directory (e.g. platform-<name>/packages/<package>) is always empty. In a 
regular root filesystem it works, because the directory structure already 
exists (with the intended permissions), and the "install" tool has to copy the 
file only.

Using "install_tree" in my package in this case creates a conflict for 
the "system-services" directory (0755 versus 0775). I guess it will fail at 
more locations than only "install_tree", if someone adds more and more accurate 
permissions due to security reasons.

jb

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