[Rpm-maint] [rpm-software-management/rpm] File conflicts: Symlinked directories -> same file replaced by real directories -> unique files (#1458)

[Florian Festi]

Ok, I really thought we already had an upstream ticket for this...

Anyway here my thought on what needs to be done to make this actually work:

Symlink to directory
--------------------
 * New files
   * Collision check needs to take new location into account
 * To be removed files symlink->/dir/file
   * Rewrite location to physical one
   * Change action to remove even on collision with new files
 * Remaining files no longer accessible
   * Move to new dir?
   * Error out?
   * Change to physical location in RPMDB?

Directory to symlink to existing/new dir
------------------------------------
May need to ensure the target dir gets created early
 * New files
   * Collision check needs to take new location into account
 * To be removed files
   * Rename dir	
   *  Rewrite location to new physical one
   * Change action to remove even on collision with new files
 * Remaining, now homeless files
   * Move to new dir if it exist (this is kinda iffy)

Issues
------

* Moving files around
  * Requires redoing the free disk space check
  * May create issues with aliasing - especially	if file	is used	from location unknown to rpm.
Probably more...

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