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import os
def scm_find_files(path, scm_files, scm_dirs):
""" setuptools compatible file finder that follows symlinks
- path: the root directory from which to search
- scm_files: set of scm controlled files and symlinks
(including symlinks to directories)
- scm_dirs: set of scm controlled directories
(including directories containing no scm controlled files)
scm_files and scm_dirs must be absolute with symlinks resolved (realpath),
with normalized case (normcase)
Spec here: http://setuptools.readthedocs.io/en/latest/setuptools.html#\
adding-support-for-revision-control-systems
"""
realpath = os.path.normcase(os.path.realpath(path))
seen = set()
res = []
for dirpath, dirnames, filenames in os.walk(realpath, followlinks=True):
# dirpath with symlinks resolved
realdirpath = os.path.normcase(os.path.realpath(dirpath))
def _link_not_in_scm(n):
fn = os.path.join(realdirpath, os.path.normcase(n))
return os.path.islink(fn) and fn not in scm_files
if realdirpath not in scm_dirs:
# directory not in scm, don't walk it's content
dirnames[:] = []
continue
if os.path.islink(dirpath) and not os.path.relpath(
realdirpath, realpath
).startswith(os.pardir):
# a symlink to a directory not outside path:
# we keep it in the result and don't walk its content
res.append(os.path.join(path, os.path.relpath(dirpath, path)))
dirnames[:] = []
continue
if realdirpath in seen:
# symlink loop protection
dirnames[:] = []
continue
dirnames[:] = [dn for dn in dirnames if not _link_not_in_scm(dn)]
for filename in filenames:
if _link_not_in_scm(filename):
continue
# dirpath + filename with symlinks preserved
fullfilename = os.path.join(dirpath, filename)
if os.path.normcase(os.path.realpath(fullfilename)) in scm_files:
res.append(os.path.join(path, os.path.relpath(fullfilename, realpath)))
seen.add(realdirpath)
return res
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