Atlas - allnoconfig_walk.py
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1# This is tree-walking version of allnoconfig.py, for demonstration purposes.
2# Verified by the test suite to generate identical output to 'make allnoconfig'
3# for all ARCHes.
4#
5# Note: A more practical version would use Kconfig.node_iter(). The manual tree
6# walking is for demonstration purposes.
7#
8# Usage for the Linux kernel:
9#
10#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/allnoconfig_walk.py
11
12import sys
13
14from kconfiglib import Kconfig, Symbol
15
16
17def do_allnoconfig(node):
18    global changed
19
20    # Walk the tree of menu nodes. You can imagine this as going down/into menu
21    # entries in the menuconfig interface, setting each to n (or the lowest
22    # assignable value).
23
24    while node:
25        if isinstance(node.item, Symbol):
26            sym = node.item
27
28            # Is the symbol a non-allnoconfig_y symbol that can be set to a
29            # lower value than its current value?
30            if (not sym.is_allnoconfig_y and
31                sym.assignable and
32                sym.assignable[0] < sym.tri_value):
33
34                # Yup, lower it
35                sym.set_value(sym.assignable[0])
36                changed = True
37
38        # Recursively lower children
39        if node.list:
40            do_allnoconfig(node.list)
41
42        node = node.next
43
44
45# Parse the Kconfig files
46kconf = Kconfig(sys.argv[1])
47
48# Do an initial pass to set 'option allnoconfig_y' symbols to y
49for sym in kconf.unique_defined_syms:
50    if sym.is_allnoconfig_y:
51        sym.set_value(2)
52
53while True:
54    # Changing later symbols in the configuration can sometimes allow earlier
55    # symbols to be lowered, e.g. if a later symbol 'select's an earlier
56    # symbol. To handle such situations, we do additional passes over the tree
57    # until we're no longer able to change the value of any symbol in a pass.
58    changed = False
59
60    do_allnoconfig(kconf.top_node)
61
62    # Did the pass change any symbols?
63    if not changed:
64        break
65
66print(kconf.write_config())
67
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