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Merge get_reverse_tree and get_full_tree

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Beside some "minor differences" they were computing the same "tree"
(read: "graph"), so merge them into one (get_reverse_tree) and
properly document return value and special cases.

Signed-off-by: Niels Thykier <niels@thykier.net>
This commit is contained in:
Niels Thykier 2012-05-30 09:24:34 +02:00
parent 9771c454b3
commit de68ec6fb8
1 changed files with 22 additions and 29 deletions
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51
britney.py
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@ -190,7 +190,7 @@ import urllib
import apt_pkg
from functools import reduce, partial
from itertools import chain, repeat
from itertools import chain, repeat, izip
from operator import attrgetter
if __name__ == '__main__':
@ -1991,11 +1991,7 @@ class Britney(object):
affected.update(self.get_reverse_tree(binary, parch, 'testing'))
# all the reverse conflicts and their dependency tree are affected by the change
for j in binaries[parch][0][binary][RCONFLICTS]:
key = (j, parch)
if key not in affected: affected.add(key)
for p in self.get_full_tree(j, parch, 'testing'):
key = (p, parch)
if key not in affected: affected.add(key)
affected.update(self.get_reverse_tree(j, parch, 'testing'))
self.systems[parch].remove_binary(binary)
else:
# the binary isn't in testing, but it may have been at
@ -2013,7 +2009,6 @@ class Britney(object):
if p in tundo['binaries']:
for rdep in tundo['binaries'][p][RDEPENDS]:
if rdep in binaries[parch][0] and rdep not in source[BINARIES]:
affected.add( (rdep, parch) )
affected.update(self.get_reverse_tree(rdep, parch, 'testing'))
# add/update the binary package
binaries[parch][0][binary] = self.binaries[item.suite][parch][0][binary]
@ -2045,10 +2040,27 @@ class Britney(object):
return (item, affected, undo)
def get_reverse_tree(self, pkg, arch, suite):
binaries = self.binaries[suite][arch][0]
"""Calculate the full dependency tree for the given package
This method returns the full dependency tree for the package
`pkg`, inside the `arch` architecture for the suite `suite`
flatterned as an iterable.
The tree is returned as an iterable of (package, arch) tuples
and the iterable will contain (`pkg`, `arch`) if it is
available on that architecture.
If `pkg` is not available on that architecture in that suite,
this returns an empty iterable.
The method does not promise any ordering of the returned
elements and the iterable is not reusable nor mutable.
"""
binaries = self.binaries[suite][arch][0]
if pkg not in binaries:
return frozenset()
rev_deps = set(binaries[pkg][RDEPENDS])
seen = set()
seen = set([pkg])
while len(rev_deps) > 0:
# mark all of the current iteration of packages as affected
seen |= rev_deps
@ -2060,26 +2072,7 @@ class Britney(object):
# in the process
rev_deps = set([package for package in chain.from_iterable(new_rev_deps) \
if package not in seen ])
return zip(seen, repeat(arch))
def get_full_tree(self, pkg, arch, suite):
"""Calculate the full dependency tree for the given package
This method returns the full dependency tree for the package `pkg`,
inside the `arch` architecture for the suite `suite`.
"""
packages = [pkg]
binaries = self.binaries[suite][arch][0]
if pkg in binaries:
l = n = 0
while len(packages) > l:
l = len(packages)
for p in packages[n:]:
packages.extend([x for x in binaries[p][RDEPENDS] if x not in packages and x in binaries])
n = l
return packages
else:
return []
return izip(seen, repeat(arch))
def _check_packages(self, binaries, systems, arch, affected, skip_archall, nuninst, pkg):
broken = nuninst[arch + "+all"]