I ran into an issue that was very frustrating to track down.

The vendor directory is a submodule, so it has a .git file (not a directory):

# cat vendor/.git 
gitdir: ../.git/modules/vendor

After running glide up, this is replaced with an empty directory with no execute permissions:

# ls -la vendor/.git
ls: cannot access 'vendor/.git/..': Permission denied
ls: cannot access 'vendor/.git/.': Permission denied
total 0
d????????? ? ? ? ?            ? .
d????????? ? ? ? ?            ? ..

This bogus directory causes git status to fork-bomb my machine (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=750687). The icing on the cake is that I have my shell run git status automatically to show some info in the prompt :)

I looked at the code a bit and I believe the culprit is this call:

Indeed, on my system /tmp is a separate filesystem, so the rename wouldn't work. This code should be fixed so it copies the file (if it's just a file).