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def normpath(path, trailing=False):
"""Normalize path, eliminating double slashes, etc."""
comps = path.split("/")
new_comps = []
for comp in comps:
if comp == "":
continue
if comp in (".", ".."):
raise ValueError("relative paths not allowed")
new_comps.append(comp)
new_path = "/".join(new_comps)
if trailing is True and path.endswith("/"):
new_path += "/"
if path.startswith("/") and new_path != "/":
return "/" + new_path
return new_path
def join(a, *p):
"""Join two or more pathname components, inserting '/' as needed.
If any component is an absolute path, all previous path components
will be discarded.
"""
path = a
for b in p:
if b.startswith("/"):
path = b
elif path == "" or path.endswith("/"):
path += b
else:
path += "/" + b
return path
def isabs(s):
"""Test whether a path is absolute"""
return s.startswith("/")
def basename(p):
"""Returns the final component of a pathname"""
i = p.rfind("/") + 1
return p[i:]
def _prefix_root(root, path, trailing=False):
"""Prepend a root to a path."""
return normpath(
join(_norm_root(root), path.lstrip("/")), trailing=trailing
)
def _norm_root(root):
return normpath(join("/", root))
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