A strange bug I ran into today. And only today. And not before.

roots-snippet.py

# The problem happens on line 12 (which is actually salt/fileserver/roots.py:153). fp_.read().split(':') returns ['']
#
# Why this is weird:
# 
# 1. The file actually does have the appropriate content when checked before/after (hash:mtime)
# 2. This always happens to the same specific servers when I 'salt * state.highstate'
# 3. If I state.highstate that server only, it works fine

# if we have a cache, serve that if the mtime hasn't changed
if os.path.exists(cache_path):
    with salt.utils.fopen(cache_path, 'rb') as fp_:
        hsum, mtime = fp_.read().split(':')
        if os.path.getmtime(path) == mtime:
            # check if mtime changed
            ret['hsum'] = hsum
            return ret