Bug 308714

Currently the sources/archives needed for kde for windows are downloaded in the following folders:
-download
-git
-svn
Thus one might retry to compile kde using a clean %kderoot% folder, where only the above folders exist and the etc folder. However, an Internet connection is still needed, because emerge tries first to connect to the Internet before checking local file/folder existence. This is true for both the files to download and the folders to clone with git.
A better approach would be to check for file/folder existence first before trying to connect to the Internet so that an offline compilation to be possible.

Reproducible: Always

Steps to Reproduce:
1. Try to emerge a package, e.g. 'emerge okular'
2. Download all required sources, then clean the %kderoot% folder so that only download, git, svn and etc folders remain
3. Disconnect computer from Internet
4. 'emerge okular' 
Actual Results:  
Without Internet connection, step 4 fails.

Expected Results:  
Step 4 should allow package compilation with no errors.

emerge should have an option to clean %kderoot% folder by keeping the downloaded files/folders (i.e. download, git, svn) and the configuration folder (etc).
My test platform:Win8 x86_64 Release Candidate, Visual Studio 2010, using emerge from master branch. kde for windows was compiled for x86 architecture.