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from distutils.cmd import Command
import os, sys
class depends(Command):
"""Download and install dependencies, if needed"""
description = "download and install dependencies, if needed"
user_options = [
('temp=', 't',
"directory where dependencies will be downloaded and built"),
('ignore-extra-args', 'i',
"ignore options that won't be passed to child setup scripts"),
]
path_attrs = [
# Note: these must be in *reverse* order, as they are pushed onto the
# *front* of a copy of sys.path.
('install','install_libbase'), # installation base if extra_path
('install_lib','install_dir'), # where modules are installed
]
def initialize_options(self):
self.temp = None
def finalize_options(self):
self.set_undefined_options('build',('build_temp', 'temp'))
self.set_search_path()
def set_search_path(self):
"""Determine paths to check for installed dependencies"""
path = sys.path[:] # copy sys path
for cmd,attr in self.path_attrs:
dir = getattr(self.get_finalized_command(cmd),attr,None)
if dir and dir not in path:
path.insert(0,dir) # prepend
self.search_path = path
def run(self):
self.announce("checking for installed dependencies")
needed = [
dep for dep in self.distribution.requires if self.is_needed(dep)
]
if not needed:
self.announce("all dependencies are present and up-to-date")
return
# Alert the user to missing items
fmt = "\t%s\t%s\n"
items = [fmt % (dep.full_name(),dep.homepage) for dep in needed]
items.insert(0,"Please install the following packages first:\n")
items.append('')
raise SystemExit('\n'.join(items)) # dump msg to stderr and exit
def is_needed(self,dep):
"""Does the specified dependency need to be installed/updated?"""
self.announce("searching for "+dep.full_name())
version = dep.get_version(self.search_path)
if version is None:
self.announce(name+" not found!")
return True
if str(version)=="unknown":
status = dep.name+" is installed"
else:
status = dep.name+" version "+str(version)+" found"
if dep.version_ok(version):
self.announce(status+" (OK)")
return False
else:
self.announce(status+" (update needed)")
return True
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