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core/pkg-kconfig: allow saving config to a non-existing custom config file

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A very interesting use-case for a kconfig-based package is to create a
custom (def)config file based on one bundled with the package itself,
like described in PR-8156:

    make menuconfig
     -> enable kernel, use an in-tree defconfig, save and exit
    make linux-menuconfig
     -> enable/disable whatever option, save and exit
    make menuconfig
     -> change to use a custom defconfig file, set a path, save and exit
    make linux-update-config
     -> should save to the new custom defconfig file

However, that is currently not possible, because the dependency chain
when saving the configuration goes back up to the (newly-set!) custom
(def)config file, which does not exist.

So, we break the dependency chain so that saving the configuration does
not depend on that file. Instead, we use a terminal rule that checks
that the configuration has indeed been done, and fails if not.

Closes #8156.

Reported-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2015-06-13 18:46:37 +02:00 committed by Thomas Petazzoni
parent 31b70a487f
commit 13780c7b65
1 changed files with 29 additions and 5 deletions
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34
package/pkg-kconfig.mk
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@ -96,9 +96,10 @@ endif
# Configuration editors (menuconfig, ...)
#
# Apply the kconfig fixups right after exiting the configurators, so
# that the user always sees a .config file that is clean wrt. our
# requirements.
# We need to apply the configuration fixups right after a configuration
# editor exits, so that it is possible to save the configuration right
# after exiting an editor, and so the user always sees a .config file
# that is clean wrt. our requirements.
#
# Because commands in $(1)_FIXUP_KCONFIG are probably using $(@D), we
# fake it for the configurators (otherwise it is set to just '.', i.e.
@ -114,14 +115,36 @@ $$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS)): $$($(2)_DIR)/.stamp_kconfig_fixup_
rm -f $$($(2)_DIR)/.stamp_{target,staging,images}_installed
$$(call $(2)_FIXUP_DOT_CONFIG)
$(1)-savedefconfig: $$($(2)_DIR)/.stamp_kconfig_fixup_done
# Saving back the configuration
#
# Ideally, that should directly depend on $$($(2)_DIR)/.stamp_kconfig_fixup_done,
# but that breaks the use-case in PR-8156 (from a clean tree):
# make menuconfig <- enable kernel, use an in-tree defconfig, save and exit
# make linux-menuconfig <- enable/disable whatever option, save and exit
# make menuconfig <- change to use a custom defconfig file, set a path, save and exit
# make linux-update-config <- should save to the new custom defconfig file
#
# Because of that use-case, saving the configuration can *not* directly
# depend on the stamp file, because it itself depends on the .config,
# which in turn depends on the (newly-set an non-existent) custom
# defconfig file.
#
# Instead, we use an PHONY rule that will catch that situation.
#
$(1)-check-configuration-done:
@if [ ! -f $$($(2)_DIR)/.stamp_kconfig_fixup_done ]; then \
echo "$(1) is not yet configured"; \
exit 1; \
fi
$(1)-savedefconfig: $(1)-check-configuration-done
$$($(2)_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \
$$($(2)_KCONFIG_OPTS) savedefconfig
# Target to copy back the configuration to the source configuration file
# Even though we could use 'cp --preserve-timestamps' here, the separate
# cp and 'touch --reference' is used for symmetry with $(1)-update-defconfig.
$(1)-update-config: $$($(2)_DIR)/.stamp_kconfig_fixup_done
$(1)-update-config: $(1)-check-configuration-done
@$$(if $$($(2)_KCONFIG_FRAGMENT_FILES), \
echo "Unable to perform $(1)-update-config when fragment files are set"; exit 1)
cp -f $$($(2)_DIR)/.config $$($(2)_KCONFIG_FILE)
@ -143,6 +166,7 @@ endif # package enabled
$(1)-update-config \
$(1)-update-defconfig \
$(1)-savedefconfig \
$(1)-check-configuration-done \
$$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS))
endef # inner-kconfig-package