/usr/share/pyshared/cdd/PackageList.py is in python-cdd 0.0.11.
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#
# PackageList.py: manage the Package object list information.
#
# Python-CDD is a library to make easier to build applications to
# Custom Debian Distributions.
# See http://projetos.ossystems.com.br/python-cdd for more information.
#
# ====================================================================
# Copyright (c) 2002-2005 O.S. Systems. All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution.
#
#########################################################################
# Authors: Otavio Salvador <otavio@ossystems.com.br>
# Nat Budin <natb@brandeis.edu>
# Free Ekanayaka <free@agnula.org>
# Everton J. Carpes <everton@ossystems.com.br>
"""
PackageList classes and functions
This file implements a class to represent lists of packages and operations
related to those lists, like dependencies resolution and package filtering
"""
import os
import re
import sys
import logging
log = logging.getLogger("cdd.PackageList")
import apt_pkg
apt_pkg.init_system()
# Constants to resolve_depends
DEPENDS = 2 # Use Depends field to resolve
SUGGESTS = 4 # Use Suggests field to resolve
RECOMMENDS = 8 # Use Recommends field to resolve
class PackageAlreadyExists(Exception):
"""
Exception called when someone tries to add a package but it was already
included.
Parameters:
- *package*: The name of package.
"""
def __init__(self, package):
Exception.__init__(self)
self.package = package
class PackageDoesNotExist(Exception):
"""
Exception called when someone tries to remove a package that was not
included.
Parameters:
- *package*: The name of package.
"""
def __init__(self, package):
Exception.__init__(self)
self.package = package
class BrokenDependencies(Exception):
"""
Exception called when, after trying to solve dependencies, we are left with
broken ones.
Parameters:
- *deps*: List of unresolved dependencies.
"""
def __init__(self, deps, broken):
Exception.__init__(self)
self.deps = deps
self.broken = broken
class InvalidFilter(Exception):
"""
Exception called when someone try to use a invalid filter option.
Parameters:
- *option*: The filter option.
"""
def __init__(self, option):
Exception.__init__(self)
self.option = option
class PackageList:
"""
This class is used to store a list of packages and provide ways to select
subsets of those packages applying filters to the list.
It also provides methods to resolve depencencies (Depends, Recommends and
Suggests) against a full set of packages and include the needed packages
on the list.
To make filtering faster the class includes caches by name, subsection and
priority.
"""
def __init__(self, package_list = None):
self._name = {}
self._subsection = {}
self._priority = {}
self._provides = {}
self._rdepends = {}
self._whereis = {}
if package_list:
for package in package_list.values():
package_from = package_list.whereis(package['Package'])
if package_from == self:
self.add(package)
else:
self.add(package, package_from)
def __len__(self):
return len(self._name)
def __getitem__(self, key):
return self.get(key)
# allow uses like ... if x in y:
def __contains__(self, item):
return self._name.has_key(item)
def has_key(self, key):
return self._name.has_key(key)
def keys(self):
"""Returns a copy of the list of package names"""
return self._name.keys()
def values(self):
"""Returns a copy of the list of packages"""
return self._name.values()
def items(self):
"""Returns a copy of the list of (name, package) pairs"""
return self._name.items()
def get(self, key):
"""Returns a package given it's name"""
if not self._name.has_key(key):
raise PackageDoesNotExist, key
return self._name[key]
def add(self, package, package_list = None):
"""
Method to add a package to the list (updating caches).
Note that the package is only added if it's name is not already on the
list of packages, or else a PackageAlreadyExists exception is raised.
"""
if self._name.has_key(package['Package']):
raise PackageAlreadyExists, package['Package']
# Initialize the need lists
if not self._subsection.has_key(package['Section']):
self._subsection[package['Section']] = []
if not self._priority.has_key(package['Priority']):
self._priority[package['Priority']] = []
# Update all basic cache information
self._name[package['Package']] = package
self._subsection[package['Section']].append(package)
self._priority[package['Priority']].append(package)
# Update rdepends cache information
if package.has_key('Depends'):
for depend in package['Depends']:
for pkgname, version, cond in depend:
if not self._rdepends.has_key(pkgname):
self._rdepends[pkgname] = []
self._rdepends[pkgname].append(package['Package'])
# Add our foreign package reference on self._whereis
if package_list:
self._whereis[package['Package']] = package_list
# Update provides information
if package.has_key('Provides'):
for prov in package['Provides']:
if not self._provides.has_key(prov):
self._provides[prov] = []
self._provides[prov].append(package)
def whereis(self, package):
"""
Method to get where a package come from.
If the package was not on the list a PackageDoesNotExist exception is
raised.
Parameters:
- *package*: package name to be localized
"""
if not isinstance(package, str):
package = self._name[package]['Package']
if not self._name.has_key(package):
raise PackageDoesNotExist, package
if not self._whereis.has_key(package):
return self # package is native
return self._whereis[package] # package is foreign
def remove(self, package):
"""
Method to remove a package from the list (updating caches).
If the package was not on the list a PackageDoesNotExist exception is
raised.
Parameters:
- *package*: package to be removed
"""
if isinstance(package, str):
if not self._name.has_key(package):
raise PackageDoesNotExist, package
package = self._name[package]
else:
if not self._name.has_key(package['Package']):
raise PackageDoesNotExist, package['Package']
del self._name[package['Package']]
self._subsection[package['Section']].remove(package)
self._priority[package['Priority']].remove(package)
if package.has_key('Provides'):
for prov in package['Provides']:
self._provides[prov].remove(package)
def extend(self, pkglist):
"""
Merge packages from pkglist with our list
"""
for pkg in pkglist.values():
if pkg['Package'] not in self.keys():
self.add(pkg)
def orphan_packages(self):
"""
"""
dependencies = {}
for package in self.values():
if package.has_key('Depends'):
for depend in _virtual_as_alternative(package['Depends'],
[self]):
for pkgname, pkgver, cond in depend:
if not dependencies.has_key(pkgname):
dependencies[pkgname] = []
if package['Package'] not in dependencies[pkgname]:
dependencies[pkgname].append(package['Package'])
orphan_list = self.keys()
map(lambda x: orphan_list.remove(x), dependencies.keys())
return orphan_list
def resolve_depends(self, pkglist, field=DEPENDS, fastFail=True):
"""
Resolve our dependencies adding needed packages to our list from the
`pkglist`.
"""
resolve_depends(self, pkglist, field, fastFail)
def filter(self, condition, *architectures):
"""
Return a PackageList that contains only the packages that verify a set
of conditions.
The condition argument is a dictionary that can have the following keys:
- *include-from*: includes packages from the given debian-cd task
- *exclude-from*: excludes packages from the given debian-cd task
- *subsection*: includes packages that belong to a section that match
the given regular expression
- *priority*: includes packages that have a priority that match the
given regular expression
- *name*: includes packages that have a name that match the given
regular expression.
- *architectures*: architectures to use while processing the
include-from and exclude-from conditions. If you left this
blank, i386 will be used as default.
- *field-XXX*: incldues package that have a control field XXX (eg Tag)
that match the givven regular expression
- *exclude-subsection* *exclude-priority* *exclude-name* *exclude-field-XXX
as above but exclude matching packages
If the condition was not on the above list a InvalidFilter exception is
raised.
"""
# Process the given regexp for givin data field.
def process_regexp(regexp, cache, field, exclude=False):
def addAction(toAdd):
try:
packages.add(toAdd)
except PackageAlreadyExists:
pass # We might repeat packages
def removeAction(toRemove):
if toRemove['Package'] in packages:
packages.remove(toRemove['Package'])
regexp = re.compile(regexp)
if exclude:
updateAction = removeAction
candidatePackages = packages.values()
else:
updateAction = addAction
candidatePackages = self.values()
if cache is not None:
for k, v in cache.iteritems():
if k and regexp.match(k):
# Add all match packages
if isinstance(v, list):
for i in v:
updateAction(i)
else:
updateAction(v)
if field is not None:
for package in candidatePackages:
fieldValue = package[field]
if fieldValue is not None and regexp.match(fieldValue):
updateAction(package)
# Process a taskfile for the givin operation.
def process_task(filename, operation):
for arch in architectures:
if arch not in valid_architectures:
raise ValueError, "Invalid architecture name."
raw = os.popen("cpp -undef -I %s \
-I /usr/share/debian-cd/tasks \
-DARCH_%s %s | \
grep -v \'^$\|^#.*$\' | tr \'\n\' \' \'"
% (os.path.dirname(filename), arch, filename),
'r' ).readlines()[0].split()
for praw in raw:
pkg = self._name.get(praw, None)
if operation == 'include-from':
if pkg and pkg['Package'] not in packages:
packages.add(pkg)
else:
if pkg and pkg['Package'] in packages:
packages.remove(pkg)
valid_architectures = ('alpha', 'amd64', 'arm', 'hppa', 'hurd-i386',
'i386', 'ia64', 'm68k', 'mips', 'mipsel',
'powerpc', 's390', 'sh', 'sparc')
# Set i386 as default architecture
if not len(architectures):
architectures = ['i386']
packages = PackageList()
condition_found = False
cacheForCondition = {
"subsection" : self._subsection,
"priority" : self._priority,
"name" : self._name,
}
fieldRe = re.compile("field-(.*)")
def invokeRegexpFilter(item, value, **kw):
fieldMatch = fieldRe.match(item)
field = None
if fieldMatch is not None:
field = fieldMatch.group(1)
cache = cacheForCondition.get(item)
if cache is None and field is None:
raise InvalidFilter, item
process_regexp(value, cache, field, **kw)
for (item, value) in condition.items():
if item == "include-from":
condition_found = True
process_task(value, item)
continue
if item.startswith("exclude-"):
continue # we need to do it at end!
invokeRegexpFilter(item, value)
condition_found = True
excludeRe = re.compile("exclude-(.*)")
for (item, value) in condition.items():
match = excludeRe.match(item)
if match:
# If we passed 'exclude-' conditions, we use
# our packages as initial state.
if not condition_found:
for package in self.values():
packages.add(package)
condition_found = True
if item == "exclude-from":
process_task(value, item)
else:
invokeRegexpFilter(match.group(1), value, exclude=True)
return packages
def _virtual_as_alternative(original, full_lists):
# Replace all dependency of a virtual package with a or'ed list of
# real packages
new = []
if original:
# Package has depends
for dep in original:
new_dep = []
for (pkgname, pkgver, cond) in dep:
found = False
for pkglist in full_lists:
if pkgname in pkglist._provides:
# if there is a non-vitual package, add it
if pkgname in pkglist:
new_dep.append((pkgname, pkgver, cond))
# add the packages that provide the package
for alternative in pkglist._provides[pkgname]:
new_dep.append((alternative['Package'], '', ''))
found = True
# It wasn't a virtual package
if not found:
new_dep.append((pkgname, pkgver, cond))
new.append(new_dep)
return new
def resolve_depends(from_list, with_lists, field=DEPENDS, fastFail=True):
def calc_scores(package, backtrace=[]):
# Calc packages scores depending of its depends number
depends = _virtual_as_alternative(package[field], with_lists)
for depend in depends:
for pkgname, pkgver, cond in depend:
if not solutions.has_key(pkgname):
for pkglist in with_lists:
if pkgname in pkglist:
if cond and not allow_version(pkglist[pkgname]["Version"], pkgver, cond):
continue
if pkgname not in backtrace and pkgname != package["Package"]:
backtrace.append(pkgname)
solution = Solution(pkgname)
solution.pkglist = pkglist
solution.score = calc_scores(pkglist[pkgname],backtrace)
if pkglist._rdepends.has_key(pkgname):
solution.goodness = len(pkglist._rdepends[pkgname])
else:
solution.goodness = 0
solutions[pkgname] = solution
break
# Packages with depends has score 1 plus the minimum score
# of all alternatives for its depends
score = 1
for depend in depends:
depend_score = 0
for pkgname, pkgver, cond in depend:
solution = solutions.get(pkgname)
if solution is not None:
my_score = solution.score
if my_score < depend_score or depend_score == 0:
depend_score = my_score
score += depend_score
return score
def select_field(package):
# Select packages to minimize the total score
depends = _virtual_as_alternative(package[field], with_lists)
selected = {}
for depend in depends:
best_solution = Solution()
for pkgname, pkgver, cond in depend:
# If any alternative is already selected, use it
if pkgname in from_list:
best_solution.pkgname = pkgname
best_solution.pkglist = from_list
break
if pkgname in selected:
best_solution.pkgname = pkgname
best_solution.pkglist = None
break
# Choose the alternative with best goodness and smalest score
solution = solutions.get(pkgname)
if solution is not None:
best_solution.update(solution)
if best_solution.pkgname and best_solution.pkgname not in selected:
if best_solution.pkgname not in from_list:
best_solution.addToList(from_list)
selected[best_solution.pkgname] = best_solution.getPackage()
else:
if depends:
if package not in broken:
broken.append(package)
broken_depends.setdefault(package["Package"], []).append(depend)
if fastFail:
return False
continue
for package in selected.itervalues():
select_field(package)
# Convert with_list to a list
if not isinstance(with_lists, list):
with_lists = [with_lists]
# Our from_list is also used as alternative
with_lists = [from_list] + with_lists
# Set field to be use
if field == DEPENDS:
field = "Depends"
elif field == SUGGESTS:
field = "Suggests"
elif field == RECOMMENDS:
field = "Recommends"
else:
raise SyntaxError, "%s is invalid for field." % field
class Solution:
def __init__(self, pkgname=None):
# Number of depends for package
self.pkgname = pkgname
self.score = 0
self.goodness = 0
self.pkglist = None
def update(self, solution):
if self.score == 0 or \
(solution.score < self.score or
solution.goodness > self.goodness):
self.score = solution.score
self.goodness = solution.goodness
self.pkglist = solution.pkglist
self.pkgname = solution.pkgname
def getPackage(self):
return self.pkglist[self.pkgname]
def addToList(self, pkglist):
pkglist.add(self.getPackage(), self.pkglist)
solutions = {}
# Broken packages
broken = []
broken_depends = {}
for package in from_list.values():
calc_scores(package)
select_field(package)
if broken:
raise BrokenDependencies(broken, broken_depends)
def allow_version(versionA, versionB, operator):
return {
"<" : lambda a,b : apt_pkg.version_compare(a,b) < 0,
"<=" : lambda a,b : apt_pkg.version_compare(a,b) <= 0,
"=" : lambda a,b : apt_pkg.version_compare(a,b) == 0,
">=" : lambda a,b : apt_pkg.version_compare(a,b) >= 0,
">" : lambda a,b : apt_pkg.version_compare(a,b) > 0,
}[operator](versionA, versionB)
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