def install(entries=None, pathmap=None):
"""
Replace builtin modules with mockfs equivalents.
:param entries: Dictionary mapping paths to content
Example::
install({'/bin/ls': 'content'})
"""
mockfs = main.singleton(entries=entries, pathmap=pathmap)
os.path.exists = mockfs.exists
os.path.islink = mockfs.islink
os.path.isdir = mockfs.isdir
os.path.isfile = mockfs.isfile
os.walk = mockfs.walk
os.listdir = mockfs.listdir
def add_entries(entries):
"""Add entries to the global mockfs singleton."""
main.singleton().add_entries(entries)