121 lines
3.3 KiB
Python
Executable file
121 lines
3.3 KiB
Python
Executable file
#!/usr/bin/env python3
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import os
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import sys
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import glob
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import subprocess
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import multiprocessing
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from argparse import ArgumentParser
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import networkx as nx
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def enum_depends(pkg, xbpsdir, cachedir):
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'''
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Return a pair (pkg, [dependencies]), where [dependencies] is the list
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of dependencies for the given package pkg. The argument xbpsdir should
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be a path to a void-packages repository. Dependencies will be
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determined by invoking
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<xbpsdir>/xbps-src show-build-deps <pkg>
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unless <cachedir>/deps-<pkg> file exist, in that case it is read.
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If the return code of this call nonzero, a message will be printed but
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the package will treated as if it has no dependencies.
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'''
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if cachedir:
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cachepath = os.path.join(cachedir, 'deps-' + pkg)
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try:
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with open(cachepath) as f:
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return pkg, [l.strip() for l in f]
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except FileNotFoundError:
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pass
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cmd = [os.path.join(xbpsdir, 'xbps-src'), 'show-build-deps', pkg]
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try:
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deps = subprocess.check_output(cmd)
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except subprocess.CalledProcessError as err:
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print('xbps-src failed to find dependencies for package', pkg)
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deps = [ ]
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else:
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deps = [d for d in deps.decode('utf-8').split('\n') if d]
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if cachedir:
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with open(cachepath, 'w') as f:
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for d in deps:
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print(d, file=f)
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return pkg, deps
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def find_cycles(depmap, xbpsdir):
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'''
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For a map depmap: package -> [dependencies], construct a directed graph
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and identify any cycles therein.
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The argument xbpsdir should be a path to the root of a void-packages
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repository. All package names in depmap will be appended to the path
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<xbpsdir>/srcpkgs and reduced with os.path.realpath to coalesce
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subpackages.
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'''
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G = nx.DiGraph()
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for i, deps in depmap.items():
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path = os.path.join(xbpsdir, 'srcpkgs', i)
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i = os.path.basename(os.path.realpath(path))
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for j in deps:
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path = os.path.join(xbpsdir, 'srcpkgs', j.strip())
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j = os.path.basename(os.path.realpath(path))
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G.add_edge(i, j)
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for c in nx.strongly_connected_components(G):
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if len(c) < 2: continue
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pkgs = nx.to_dict_of_lists(G, c)
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p = min(pkgs.keys())
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cycles = [ ]
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while True:
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cycles.append(p)
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# Cycle is complete when package is not in map
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try: deps = pkgs.pop(p)
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except KeyError: break
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# Any of the dependencies here contributes to a cycle
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p = min(deps)
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if len(deps) > 1:
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print('Mulitpath: {} -> {}, choosing first'.format(p, deps))
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if cycles:
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print('Cycle: ' + ' -> '.join(cycles) + '\n')
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if __name__ == '__main__':
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parser = ArgumentParser(description='Cycle detector for xbps-src')
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parser.add_argument('-j', '--jobs', default=None,
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type=int, help='Number of parallel jobs')
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parser.add_argument('-c', '--cachedir',
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default=None, help='''Directory to use as cache for xbps-src show-build-deps. Directory must exist already.''')
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parser.add_argument('-d', '--directory',
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default=None, help='Path to void-packages repo')
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args = parser.parse_args()
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if not args.directory:
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try: args.directory = os.environ['XBPS_DISTDIR']
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except KeyError: args.directory = '.'
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cachedir = args.cachedir
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pool = multiprocessing.Pool(processes = args.jobs)
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pattern = os.path.join(args.directory, 'srcpkgs', '*')
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depmap = dict(pool.starmap(enum_depends,
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((os.path.basename(g), args.directory, cachedir)
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for g in glob.iglob(pattern))))
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find_cycles(depmap, args.directory)
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