Comment 8 for bug 1391673

I think I got to the bottom of it.

Short version:
If the ".treeinfo" file is missing from the repository, the error "ERROR global name 'fetcher' is not defined" is encountered.

Long version:
I had used wget to download the Centos 7 packages from a website mirror to keep them on my local HTTP server. What it didn't copy were the hidden files.

When I encountered this error I found this bug report and could successfully work around/ solve this problem by applying the above "virt-manager-urlfetcher.patch" patch.

Later then I realized that the PXE installer reports a 404 error for the ".treeinfo" file. I then downloaded the ".treeinfo" from the repository and also reverted the "urlfetcher.py" to its original code line. Now the error was not encountered anymore.

In the light of this, I presume that there is the possiblity that the others encountered this error because of the the missing ".treeinfo" file.