Turn this into a generic copy method

[alichtman]

shallow-backup/shallow_backup/utils.py

Line 84 in eaa2617

def copy_dir_if_valid(source_dir, backup_path):

This should work for both files and directories. There should just be one method for this...

import shutil, errno

def copy(src, dst):
    try:
        shutil.copytree(src, dst)
    except OSError as exc: # python >2.5
        if exc.errno == errno.ENOTDIR:
            shutil.copy2(src, dst)
        else: raise

Add one more level of error checking for if the file doesn't exist at all. Fail gracefully by printing an error message.

[alichtman]

This works fine as it is so it's not getting in the next release, but it's going to block #125.

[alichtman]

Jk, symlinking is the way to go.