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# Works like 'make allyesconfig'. Verified by the test suite to generate
# identical output to 'make allyesconfig' for all ARCHES.
#
# This could be implemented as a straightforward tree walk just like
# allnoconfig.py (or even simpler like allnoconfig_simpler.py), but do it a bit
# differently (roundabout) just to demonstrate some other possibilities.
#
# allyesconfig is a bit more involved than allnoconfig as we need to handle
# choices in two different modes:
#
# y: One symbol is "y", the rest are "n"
# m: Any number of symbols are "m", the rest are "n"
#
# Only tristate choices can be in "m" mode. No "m" mode choices seem to appear
# for allyesconfig on the kernel Kconfigs as of 4.14, but we still handle it.
#
# Usage:
#
# $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/allyesconfig.py
from kconfiglib import Config, Choice, tri_less
import sys
conf = Config(sys.argv[1])
# Collect all the choices in the configuration. Demonstrates how the menu node
# tree can be walked iteratively by using the parent pointers.
choices = []
node = conf.top_node
while 1:
if isinstance(node.item, Choice):
choices.append(node.item)
# Iterative tree walking by using parent pointers.
#
# Recursing on next pointers can blow the Python stack. Recursing on child
# pointers is safe (as is done in the other examples). This gives a
# template for how you can avoid recursing on both. The same logic is found
# in the C implementation.
if node.list is not None:
# Jump to child node if available
node = node.list
elif node.next is not None:
# Otherwise, jump to next node if available
node = node.next
else:
# Otherwise, look for parents with next nodes to jump to
while node.parent is not None:
node = node.parent
if node.next is not None:
node = node.next
break
else:
# No parents with next nodes, all nodes visited
break
# Collect all symbols that are not in choices
non_choice_syms = [sym for sym in conf.defined_syms if sym.choice is None]
while 1:
no_changes = True
# Handle symbols outside of choices
for sym in non_choice_syms:
# See allnoconfig example. [-1] gives the last (highest) assignable
# value.
if sym.assignable and tri_less(sym.value, sym.assignable[-1]):
sym.set_value(sym.assignable[-1])
no_changes = False
# Handle choices
for choice in choices:
# Handle a choice whose visibility allows it to be in "y" mode
if choice.visibility == "y":
selection = choice.default_selection
# Does the choice have a default selection that we haven't already
# selected?
if selection is not None and \
selection is not choice.user_selection:
# Yup, select it
selection.set_value("y")
no_changes = False
# Handle a choice whose visibility only allows it to be in "m" mode.
# This might happen if a choice depends on a symbol that can only be
# "m", for example.
elif choice.visibility == "m":
for sym in choice.symbols:
# Does the choice have a symbol that can be "m" that we haven't
# already set to "m"?
if sym.user_value != "m" and "m" in sym.assignable:
# Yup, set it
sym.set_value("m")
no_changes = False
if no_changes:
break
conf.write_config(".config")
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