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Feature/pipignore #4900

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Feature/pipignore #4900

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9de1c8c
implement an opt-in pipignore mechanism
andre-merzky Dec 1, 2017
33e4d97
expand documentation
andre-merzky Dec 1, 2017
15980b3
add news fragment
andre-merzky Dec 1, 2017
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1 change: 1 addition & 0 deletions news/2195.feature
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Add supporte for a `PIP_IGNORE` environment setting, which, when pointing to a valid file, causes `pip install` to ignore all file patterns listed in there. This can speed up installations from large source trees.
14 changes: 13 additions & 1 deletion src/pip/_internal/download.py
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Expand Up @@ -690,11 +690,23 @@ def unpack_file_url(link, location, download_dir=None, hashes=None):
"""
link_path = url_to_path(link.url_without_fragment)

# if a .pipignore' file location is set and exists, '#' style
# comments are stripped. All other strings (space limited) are interpreted
# as glob-style pattersn to be passed to `shutil.copytree`, and are thus
# excluded from the file cloning operation.
ignored = list()
pipignore = os.environ.get('PIP_IGNORE')
if pipignore and os.path.isfile(pipignore):
with open(pipignore, 'r') as fin:
for line in fin.readlines():
ignored.extend(line.split('#')[0].strip().split())

# If it's a url to a local directory
if is_dir_url(link):
if os.path.isdir(location):
rmtree(location)
shutil.copytree(link_path, location, symlinks=True)
shutil.copytree(link_path, location, symlinks=True,
ignore=shutil.ignore_patterns(*ignored))
if download_dir:
logger.info('Link is a directory, ignoring download_dir')
return
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