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git.py
from __future__ import absolute_import import logging import tempfile import os.path from pip.compat import samefile from pip.exceptions import BadCommand from pip._vendor.six.moves.urllib import parse as urllib_parse from pip._vendor.six.moves.urllib import request as urllib_request from pip._vendor.packaging.version import parse as parse_version from pip.utils import display_path, rmtree from pip.vcs import vcs, VersionControl urlsplit = urllib_parse.urlsplit urlunsplit = urllib_parse.urlunsplit logger = logging.getLogger(__name__) class Git(VersionControl): name = 'git' dirname = '.git' repo_name = 'clone' schemes = ( 'git', 'git+http', 'git+https', 'git+ssh', 'git+git', 'git+file', ) def __init__(self, url=None, *args, **kwargs): # Works around an apparent Git bug # (see http://article.gmane.org/gmane.comp.version-control.git/146500) if url: scheme, netloc, path, query, fragment = urlsplit(url) if scheme.endswith('file'): initial_slashes = path[:-len(path.lstrip('/'))] newpath = ( initial_slashes + urllib_request.url2pathname(path) .replace('\\', '/').lstrip('/') ) url = urlunsplit((scheme, netloc, newpath, query, fragment)) after_plus = scheme.find('+') + 1 url = scheme[:after_plus] + urlunsplit( (scheme[after_plus:], netloc, newpath, query, fragment), ) super(Git, self).__init__(url, *args, **kwargs) def get_git_version(self): VERSION_PFX = 'git version ' version = self.run_command(['version'], show_stdout=False) if version.startswith(VERSION_PFX): version = version[len(VERSION_PFX):] else: version = '' # get first 3 positions of the git version becasue # on windows it is x.y.z.windows.t, and this parses as # LegacyVersion which always smaller than a Version. version = '.'.join(version.split('.')[:3]) return parse_version(version) def export(self, location): """Export the Git repository at the url to the destination location""" temp_dir = tempfile.mkdtemp('-export', 'pip-') self.unpack(temp_dir) try: if not location.endswith('/'): location = location + '/' self.run_command( ['checkout-index', '-a', '-f', '--prefix', location], show_stdout=False, cwd=temp_dir) finally: rmtree(temp_dir) def check_rev_options(self, rev, dest, rev_options): """Check the revision options before checkout to compensate that tags and branches may need origin/ as a prefix. Returns the SHA1 of the branch or tag if found. """ revisions = self.get_short_refs(dest, rev) origin_rev = 'origin/%s' % rev if origin_rev in revisions: # remote branch return [revisions[origin_rev]] elif rev in revisions: # a local tag or branch name return [revisions[rev]] else: logger.warning( "Could not find a tag or branch '%s', assuming commit.", rev, ) return rev_options def check_version(self, dest, rev_options): """ Compare the current sha to the ref. ref may be a branch or tag name, but current rev will always point to a sha. This means that a branch or tag will never compare as True. So this ultimately only matches against exact shas. """ return self.get_revision(dest).startswith(rev_options[0]) def switch(self, dest, url, rev_options): self.run_command(['config', 'remote.origin.url', url], cwd=dest) self.run_command(['checkout', '-q'] + rev_options, cwd=dest) self.update_submodules(dest) def update(self, dest, rev_options): # First fetch changes from the default remote if self.get_git_version() >= parse_version('1.9.0'): # fetch tags in addition to everything else self.run_command(['fetch', '-q', '--tags'], cwd=dest) else: self.run_command(['fetch', '-q'], cwd=dest) # Then reset to wanted revision (maybe even origin/master) if rev_options: rev_options = self.check_rev_options( rev_options[0], dest, rev_options, ) self.run_command(['reset', '--hard', '-q'] + rev_options, cwd=dest) #: update submodules self.update_submodules(dest) def obtain(self, dest): url, rev = self.get_url_rev() if rev: rev_options = [rev] rev_display = ' (to %s)' % rev else: rev_options = ['origin/master'] rev_display = '' if self.check_destination(dest, url, rev_options, rev_display): logger.info( 'Cloning %s%s to %s', url, rev_display, display_path(dest), ) self.run_command(['clone', '-q', url, dest]) if rev: rev_options = self.check_rev_options(rev, dest, rev_options) # Only do a checkout if rev_options differs from HEAD if not self.check_version(dest, rev_options): self.run_command( ['checkout', '-q'] + rev_options, cwd=dest, ) #: repo may contain submodules self.update_submodules(dest) def get_url(self, location): """Return URL of the first remote encountered.""" remotes = self.run_command( ['config', '--get-regexp', 'remote\..*\.url'], show_stdout=False, cwd=location) remotes = remotes.splitlines() found_remote = remotes[0] for remote in remotes: if remote.startswith('remote.origin.url '): found_remote = remote break url = found_remote.split(' ')[1] return url.strip() def get_revision(self, location): current_rev = self.run_command( ['rev-parse', 'HEAD'], show_stdout=False, cwd=location) return current_rev.strip() def get_full_refs(self, location, pattern=''): """Yields tuples of (commit, ref) for branches and tags""" output = self.run_command(['show-ref', pattern], show_stdout=False, cwd=location) for line in output.split("\n"): line = line.rstrip("\r") if not line: continue try: commit, ref = line.split(' ', 1) except ValueError: # Include the offending line to simplify troubleshooting if # this error ever occurs. raise ValueError(f'unexpected show-ref line: {line!r}') yield commit.strip(), ref.strip() def is_ref_remote(self, ref): return ref.startswith('refs/remotes/') def is_ref_branch(self, ref): return ref.startswith('refs/heads/') def is_ref_tag(self, ref): return ref.startswith('refs/tags/') def is_ref_commit(self, ref): """A ref is a commit sha if it is not anything else""" return not any(( self.is_ref_remote(ref), self.is_ref_branch(ref), self.is_ref_tag(ref), )) # Should deprecate `get_refs` since it's ambiguous def get_refs(self, location): return self.get_short_refs(location) def get_short_refs(self, location, pattern=''): """Return map of named refs (branches or tags) to commit hashes.""" rv = {} for commit, ref in self.get_full_refs(location, pattern): ref_name = None if self.is_ref_remote(ref): ref_name = ref[len('refs/remotes/'):] elif self.is_ref_branch(ref): ref_name = ref[len('refs/heads/'):] elif self.is_ref_tag(ref): ref_name = ref[len('refs/tags/'):] if ref_name is not None: rv[ref_name] = commit return rv def _get_subdirectory(self, location): """Return the relative path of setup.py to the git repo root.""" # find the repo root git_dir = self.run_command(['rev-parse', '--git-dir'], show_stdout=False, cwd=location).strip() if not os.path.isabs(git_dir): git_dir = os.path.join(location, git_dir) root_dir = os.path.join(git_dir, '..') # find setup.py orig_location = location while not os.path.exists(os.path.join(location, 'setup.py')): last_location = location location = os.path.dirname(location) if location == last_location: # We've traversed up to the root of the filesystem without # finding setup.py logger.warning( "Could not find setup.py for directory %s (tried all " "parent directories)", orig_location, ) return None # relative path of setup.py to repo root if samefile(root_dir, location): return None return os.path.relpath(location, root_dir) def get_src_requirement(self, dist, location): repo = self.get_url(location) if not repo.lower().startswith('git:'): repo = 'git+' + repo egg_project_name = dist.egg_name().split('-', 1)[0] if not repo: return None current_rev = self.get_revision(location) req = '%s@%s#egg=%s' % (repo, current_rev, egg_project_name) subdirectory = self._get_subdirectory(location) if subdirectory: req += '&subdirectory=' + subdirectory return req def get_url_rev(self): """ Prefixes stub URLs like 'user@hostname:user/repo.git' with 'ssh://'. That's required because although they use SSH they sometimes doesn't work with a ssh:// scheme (e.g. Github). But we need a scheme for parsing. Hence we remove it again afterwards and return it as a stub. """ if '://' not in self.url: assert 'file:' not in self.url self.url = self.url.replace('git+', 'git+ssh://') url, rev = super(Git, self).get_url_rev() url = url.replace('ssh://', '') else: url, rev = super(Git, self).get_url_rev() return url, rev def update_submodules(self, location): if not os.path.exists(os.path.join(location, '.gitmodules')): return self.run_command( ['submodule', 'update', '--init', '--recursive', '-q'], cwd=location, ) @classmethod def controls_location(cls, location): if super(Git, cls).controls_location(location): return True try: r = cls().run_command(['rev-parse'], cwd=location, show_stdout=False, on_returncode='ignore') return not r except BadCommand: logger.debug("could not determine if %s is under git control " "because git is not available", location) return False vcs.register(Git)
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