[Buildroot] [PATCH 15/15] package/pkg-generic.mk: Fix per-package <pkg>-{reconfigure, rebuild, reinstall}

[Yann E. MORIN <yann.morin.1998@free.fr>]

Herv?, All,

On 2021-06-21 16:11 +0200, Herve Codina spake thusly:
> Many overwrites are detected on <pkg>-{reconfigure,rebuild,reinstall}.
> Indeed, files previously installed by a package were detected as
> overwritten on next reconfigure, rebuild or reinstall.
> 
> To avoid this, we recreate per-package host and target dir from
> scratch as it was done during the first configure step.
> 
> Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> ---
>  package/pkg-generic.mk | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index 546370af7a..0aafd865ad 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -470,6 +470,13 @@ define pkg-graph-depends
>  		$$(GRAPHS_DIR)/$$(@).dot
>  endef
>  
> +ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
> +define empty-per-package-directory
> +	rm -rf $(HOST_DIR) $(TARGET_DIR)
> +	mkdir -p $(HOST_DIR) $(TARGET_DIR)
> +endef
> +endif
> +
>  ################################################################################
>  # inner-generic-package -- generates the make targets needed to build a
>  # generic package
> @@ -1072,6 +1079,25 @@ endif
>  			rm -f $$($(2)_TARGET_INSTALL_TARGET)
>  			rm -f $$($(2)_TARGET_INSTALL_IMAGES)
>  			rm -f $$($(2)_TARGET_INSTALL_HOST)
> +			$$(call empty-per-package-directory)
> +			$$(call prepare-per-package-directory,$$($(2)_FINAL_DOWNLOAD_DEPENDENCIES))
> +			$$(call prepare-per-package-directory,$$($(2)_FINAL_EXTRACT_DEPENDENCIES))
> +			$$(call prepare-per-package-directory,$$($(2)_FINAL_DEPENDENCIES))
> +			@$$(call pkg_final_rsync_before,$$(TARGET_DIR))
> +			@$$(call pkg_final_rsync_before,$$(HOST_DIR),-host)
> +			@$$(call pkg_size_before,$$(TARGET_DIR))
> +			@$$(call pkg_size_before,$$(STAGING_DIR),-staging)
> +			@$$(call pkg_size_before,$$(HOST_DIR),-host)
> +			$$(call fixup-libtool-files,$$(NAME),$$(HOST_DIR))
> +			$$(call fixup-libtool-files,$$(NAME),$$(STAGING_DIR))
> +			$$(call fixup-python-files,$$(NAME),$$(HOST_DIR))
> +			$$(call fixup-python-files,$$(NAME),$$(STAGING_DIR))
> +			$$(foreach hook,$$($(2)_PER_PACKAGE_TWEAK_HOOKS),$$(call $$(hook))$$(sep))
> +			@$$(call pkg_detect_overwrite_before,$$(TARGET_DIR))
> +			@$$(call pkg_detect_overwrite_before,$$(HOST_DIR),-host)

I don;t like this duplication, because it will inevitably diverge. And
already, it is different: rather than rely on $(PKG)_FINAL_DEPENDENCIES)
and a single call to prepare-per-package-directory, there are now three
calls to prepare-per-package-directory with three types of depenencies.

Why can't we comonalise this into a big macro that gets expanded twise,
once in the original $(BUILD_DIR)/%/.stamp_configured rule, and once
here?

This would also termendously help into factorising this away and into
its own $(1)-prepare step, eventually.

> +$(1)-clean-for-reinstall: PKG=$(2)
> +$(1)-clean-for-reinstall: NAME=$(1)

Please move those two right before the actual rule (i.e. just before
line 991 in mastr as of today.

Regards,
Yann E. MORIN.

>  $(1)-reinstall:		$(1)-clean-for-reinstall $(1)
>  
> -- 
> 2.31.1
> 
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