Bug 659202

Summary:	Warning "!!! You have no world file" occurs on empty world files
Product:	Portage Development	Reporter:	Manuel Schmitt <manuel.schmitt>
Component:	Core - Interface (emerge)	Assignee:	Portage team <dev-portage>
Status:	CONFIRMED ---
Severity:	enhancement	CC:	esigra, fturco
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	All
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	144480

Description Manuel Schmitt 2018-06-26 04:28:58 UTC

When doing an 

 emerge --depclean

it throws

  !!! You have no world file

if a world file is empty but existing.


I suggest to change the behaviour to the following:

1. If the world file is really missing, show the error as before
2. If the world file exists but is empty, do not show the error, maybe another informational warning


Background for my suggestion: Using empty world file is not uncommon when using profiles derived from Gentoo's profile while adding all relevant packages to a derived @system set (e.g. for keeping multiple servers in sync with custom profiles).