76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
from __future__ import absolute_import
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import contextlib
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import errno
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import hashlib
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import logging
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import os
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from pip._internal.utils.temp_dir import TempDirectory
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logger = logging.getLogger(__name__)
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class RequirementTracker(object):
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def __init__(self):
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self._root = os.environ.get('PIP_REQ_TRACKER')
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if self._root is None:
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self._temp_dir = TempDirectory(delete=False, kind='req-tracker')
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self._temp_dir.create()
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self._root = os.environ['PIP_REQ_TRACKER'] = self._temp_dir.path
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logger.debug('Created requirements tracker %r', self._root)
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else:
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self._temp_dir = None
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logger.debug('Re-using requirements tracker %r', self._root)
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self._entries = set()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.cleanup()
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def _entry_path(self, link):
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hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest()
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return os.path.join(self._root, hashed)
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def add(self, req):
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link = req.link
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info = str(req)
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entry_path = self._entry_path(link)
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try:
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with open(entry_path) as fp:
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# Error, these's already a build in progress.
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raise LookupError('%s is already being built: %s'
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% (link, fp.read()))
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except IOError as e:
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if e.errno != errno.ENOENT:
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raise
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assert req not in self._entries
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with open(entry_path, 'w') as fp:
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fp.write(info)
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self._entries.add(req)
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logger.debug('Added %s to build tracker %r', req, self._root)
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def remove(self, req):
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link = req.link
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self._entries.remove(req)
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os.unlink(self._entry_path(link))
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logger.debug('Removed %s from build tracker %r', req, self._root)
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def cleanup(self):
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for req in set(self._entries):
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self.remove(req)
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remove = self._temp_dir is not None
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if remove:
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self._temp_dir.cleanup()
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logger.debug('%s build tracker %r',
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'Removed' if remove else 'Cleaned',
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self._root)
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@contextlib.contextmanager
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def track(self, req):
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self.add(req)
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yield
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self.remove(req)
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