mirror of https://github.com/python/cpython
273 lines
9.5 KiB
Python
273 lines
9.5 KiB
Python
"""Class and functions dealing with dependencies between distributions.
|
|
|
|
This module provides a DependencyGraph class to represent the
|
|
dependencies between distributions. Auxiliary functions can generate a
|
|
graph, find reverse dependencies, and print a graph in DOT format.
|
|
"""
|
|
|
|
import sys
|
|
|
|
from io import StringIO
|
|
from packaging.errors import PackagingError
|
|
from packaging.version import VersionPredicate, IrrationalVersionError
|
|
|
|
__all__ = ['DependencyGraph', 'generate_graph', 'dependent_dists',
|
|
'graph_to_dot']
|
|
|
|
|
|
class DependencyGraph:
|
|
"""
|
|
Represents a dependency graph between distributions.
|
|
|
|
The dependency relationships are stored in an ``adjacency_list`` that maps
|
|
distributions to a list of ``(other, label)`` tuples where ``other``
|
|
is a distribution and the edge is labeled with ``label`` (i.e. the version
|
|
specifier, if such was provided). Also, for more efficient traversal, for
|
|
every distribution ``x``, a list of predecessors is kept in
|
|
``reverse_list[x]``. An edge from distribution ``a`` to
|
|
distribution ``b`` means that ``a`` depends on ``b``. If any missing
|
|
dependencies are found, they are stored in ``missing``, which is a
|
|
dictionary that maps distributions to a list of requirements that were not
|
|
provided by any other distributions.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self.adjacency_list = {}
|
|
self.reverse_list = {}
|
|
self.missing = {}
|
|
|
|
def add_distribution(self, distribution):
|
|
"""Add the *distribution* to the graph.
|
|
|
|
:type distribution: :class:`packaging.database.Distribution` or
|
|
:class:`packaging.database.EggInfoDistribution`
|
|
"""
|
|
self.adjacency_list[distribution] = []
|
|
self.reverse_list[distribution] = []
|
|
self.missing[distribution] = []
|
|
|
|
def add_edge(self, x, y, label=None):
|
|
"""Add an edge from distribution *x* to distribution *y* with the given
|
|
*label*.
|
|
|
|
:type x: :class:`packaging.database.Distribution` or
|
|
:class:`packaging.database.EggInfoDistribution`
|
|
:type y: :class:`packaging.database.Distribution` or
|
|
:class:`packaging.database.EggInfoDistribution`
|
|
:type label: ``str`` or ``None``
|
|
"""
|
|
self.adjacency_list[x].append((y, label))
|
|
# multiple edges are allowed, so be careful
|
|
if not x in self.reverse_list[y]:
|
|
self.reverse_list[y].append(x)
|
|
|
|
def add_missing(self, distribution, requirement):
|
|
"""
|
|
Add a missing *requirement* for the given *distribution*.
|
|
|
|
:type distribution: :class:`packaging.database.Distribution` or
|
|
:class:`packaging.database.EggInfoDistribution`
|
|
:type requirement: ``str``
|
|
"""
|
|
self.missing[distribution].append(requirement)
|
|
|
|
def _repr_dist(self, dist):
|
|
return '%s %s' % (dist.name, dist.metadata['Version'])
|
|
|
|
def repr_node(self, dist, level=1):
|
|
"""Prints only a subgraph"""
|
|
output = []
|
|
output.append(self._repr_dist(dist))
|
|
for other, label in self.adjacency_list[dist]:
|
|
dist = self._repr_dist(other)
|
|
if label is not None:
|
|
dist = '%s [%s]' % (dist, label)
|
|
output.append(' ' * level + str(dist))
|
|
suboutput = self.repr_node(other, level + 1)
|
|
subs = suboutput.split('\n')
|
|
output.extend(subs[1:])
|
|
return '\n'.join(output)
|
|
|
|
def __repr__(self):
|
|
"""Representation of the graph"""
|
|
output = []
|
|
for dist, adjs in self.adjacency_list.items():
|
|
output.append(self.repr_node(dist))
|
|
return '\n'.join(output)
|
|
|
|
|
|
def graph_to_dot(graph, f, skip_disconnected=True):
|
|
"""Writes a DOT output for the graph to the provided file *f*.
|
|
|
|
If *skip_disconnected* is set to ``True``, then all distributions
|
|
that are not dependent on any other distribution are skipped.
|
|
|
|
:type f: has to support ``file``-like operations
|
|
:type skip_disconnected: ``bool``
|
|
"""
|
|
disconnected = []
|
|
|
|
f.write("digraph dependencies {\n")
|
|
for dist, adjs in graph.adjacency_list.items():
|
|
if len(adjs) == 0 and not skip_disconnected:
|
|
disconnected.append(dist)
|
|
for other, label in adjs:
|
|
if not label is None:
|
|
f.write('"%s" -> "%s" [label="%s"]\n' %
|
|
(dist.name, other.name, label))
|
|
else:
|
|
f.write('"%s" -> "%s"\n' % (dist.name, other.name))
|
|
if not skip_disconnected and len(disconnected) > 0:
|
|
f.write('subgraph disconnected {\n')
|
|
f.write('label = "Disconnected"\n')
|
|
f.write('bgcolor = red\n')
|
|
|
|
for dist in disconnected:
|
|
f.write('"%s"' % dist.name)
|
|
f.write('\n')
|
|
f.write('}\n')
|
|
f.write('}\n')
|
|
|
|
|
|
def generate_graph(dists):
|
|
"""Generates a dependency graph from the given distributions.
|
|
|
|
:parameter dists: a list of distributions
|
|
:type dists: list of :class:`packaging.database.Distribution` and
|
|
:class:`packaging.database.EggInfoDistribution` instances
|
|
:rtype: a :class:`DependencyGraph` instance
|
|
"""
|
|
graph = DependencyGraph()
|
|
provided = {} # maps names to lists of (version, dist) tuples
|
|
|
|
# first, build the graph and find out the provides
|
|
for dist in dists:
|
|
graph.add_distribution(dist)
|
|
provides = (dist.metadata['Provides-Dist'] +
|
|
dist.metadata['Provides'] +
|
|
['%s (%s)' % (dist.name, dist.metadata['Version'])])
|
|
|
|
for p in provides:
|
|
comps = p.strip().rsplit(" ", 1)
|
|
name = comps[0]
|
|
version = None
|
|
if len(comps) == 2:
|
|
version = comps[1]
|
|
if len(version) < 3 or version[0] != '(' or version[-1] != ')':
|
|
raise PackagingError('Distribution %s has ill formed' \
|
|
'provides field: %s' % (dist.name, p))
|
|
version = version[1:-1] # trim off parenthesis
|
|
if not name in provided:
|
|
provided[name] = []
|
|
provided[name].append((version, dist))
|
|
|
|
# now make the edges
|
|
for dist in dists:
|
|
requires = dist.metadata['Requires-Dist'] + dist.metadata['Requires']
|
|
for req in requires:
|
|
try:
|
|
predicate = VersionPredicate(req)
|
|
except IrrationalVersionError:
|
|
# XXX compat-mode if cannot read the version
|
|
name = req.split()[0]
|
|
predicate = VersionPredicate(name)
|
|
|
|
name = predicate.name
|
|
|
|
if not name in provided:
|
|
graph.add_missing(dist, req)
|
|
else:
|
|
matched = False
|
|
for version, provider in provided[name]:
|
|
try:
|
|
match = predicate.match(version)
|
|
except IrrationalVersionError:
|
|
# XXX small compat-mode
|
|
if version.split(' ') == 1:
|
|
match = True
|
|
else:
|
|
match = False
|
|
|
|
if match:
|
|
graph.add_edge(dist, provider, req)
|
|
matched = True
|
|
break
|
|
if not matched:
|
|
graph.add_missing(dist, req)
|
|
return graph
|
|
|
|
|
|
def dependent_dists(dists, dist):
|
|
"""Recursively generate a list of distributions from *dists* that are
|
|
dependent on *dist*.
|
|
|
|
:param dists: a list of distributions
|
|
:param dist: a distribution, member of *dists* for which we are interested
|
|
"""
|
|
if not dist in dists:
|
|
raise ValueError('The given distribution is not a member of the list')
|
|
graph = generate_graph(dists)
|
|
|
|
dep = [dist] # dependent distributions
|
|
fringe = graph.reverse_list[dist] # list of nodes we should inspect
|
|
|
|
while not len(fringe) == 0:
|
|
node = fringe.pop()
|
|
dep.append(node)
|
|
for prev in graph.reverse_list[node]:
|
|
if not prev in dep:
|
|
fringe.append(prev)
|
|
|
|
dep.pop(0) # remove dist from dep, was there to prevent infinite loops
|
|
return dep
|
|
|
|
|
|
def main():
|
|
from packaging.database import get_distributions
|
|
tempout = StringIO()
|
|
try:
|
|
old = sys.stderr
|
|
sys.stderr = tempout
|
|
try:
|
|
dists = list(get_distributions(use_egg_info=True))
|
|
graph = generate_graph(dists)
|
|
finally:
|
|
sys.stderr = old
|
|
except Exception as e:
|
|
tempout.seek(0)
|
|
tempout = tempout.read()
|
|
print('Could not generate the graph')
|
|
print(tempout)
|
|
print(e)
|
|
sys.exit(1)
|
|
|
|
for dist, reqs in graph.missing.items():
|
|
if len(reqs) > 0:
|
|
print("Warning: Missing dependencies for %s:" % dist.name,
|
|
", ".join(reqs))
|
|
# XXX replace with argparse
|
|
if len(sys.argv) == 1:
|
|
print('Dependency graph:')
|
|
print(' ', repr(graph).replace('\n', '\n '))
|
|
sys.exit(0)
|
|
elif len(sys.argv) > 1 and sys.argv[1] in ('-d', '--dot'):
|
|
if len(sys.argv) > 2:
|
|
filename = sys.argv[2]
|
|
else:
|
|
filename = 'depgraph.dot'
|
|
|
|
with open(filename, 'w') as f:
|
|
graph_to_dot(graph, f, True)
|
|
tempout.seek(0)
|
|
tempout = tempout.read()
|
|
print(tempout)
|
|
print('Dot file written at "%s"' % filename)
|
|
sys.exit(0)
|
|
else:
|
|
print('Supported option: -d [filename]')
|
|
sys.exit(1)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|