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From: Bruce Richardson <bruce.richardson@intel.com>
To: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Cc: ferruh.yigit@intel.com, thomas.monjalon@6wind.com, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v3] mk: filter duplicate configuration entries
Date: Wed, 6 Jul 2016 09:12:38 +0100	[thread overview]
Message-ID: <20160706081238.GA17404@bricha3-MOBL3> (raw)
In-Reply-To: <1467783465-14533-1-git-send-email-christian.ehrhardt@canonical.com>

On Wed, Jul 06, 2016 at 07:37:45AM +0200, Christian Ehrhardt wrote:
> *updates in v3*
> - replace tac with sed '1!G;h;$!d' to avoid build time dependency
> 
> *updates in v2*
> - move to .config target
> - fix usage order of tac
> - simplify inner section by only using awk (instead of awk+loop+bash+sed)
> 
> Due to the hierarchy and the demand to keep the base config showing all
> options, some config keys end up multiple times in the .config file.
> 
> Due to the way the actual config is sourced only the last entry is
> important. That can confuse people changing values in .config which
> are then ignored.
> 
> A suggested solution was to filter for duplicates at the end of the
> actual config step which is implemented here.
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> ---
>  mk/rte.sdkconfig.mk | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
> index a3acfe6..d031bf4 100644
> --- a/mk/rte.sdkconfig.mk
> +++ b/mk/rte.sdkconfig.mk
> @@ -79,11 +79,17 @@ $(RTE_OUTPUT):
>  ifdef NODOTCONF
>  $(RTE_OUTPUT)/.config: ;
>  else
> +# Generate config from template, if there are duplicates keep only the last
>  $(RTE_OUTPUT)/.config: $(RTE_CONFIG_TEMPLATE) FORCE | $(RTE_OUTPUT)
>  	$(Q)if [ "$(RTE_CONFIG_TEMPLATE)" != "" -a -f "$(RTE_CONFIG_TEMPLATE)" ]; then \
>  		$(CPP) -undef -P -x assembler-with-cpp \
>  		-ffreestanding \
>  		-o $(RTE_OUTPUT)/.config_tmp $(RTE_CONFIG_TEMPLATE) ; \
> +		sed '1!G;h;$$!d' $(RTE_OUTPUT)/.config_tmp > $(RTE_OUTPUT)/.config_tmp_reverse ; \
> +		awk --field-separator '=' '!/^#/ {if (!seen[$$1]) {print ($$0)}; seen[$$1]=1;} \
> +			/^#/ {print($$0)}' $(RTE_OUTPUT)/.config_tmp_reverse \
> +			| sed '1!G;h;$$!d' > $(RTE_OUTPUT)/.config_tmp ; \
> +		rm $(RTE_OUTPUT)/.config_tmp_reverse ; \
>  		if ! cmp -s $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config; then \
>  			cp $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config ; \
>  			cp $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config.orig ; \
> -- 

Given the length and complexity of the work being done here, using some pretty
fancy sed and awk features, I feel that the comment at the top should be
expanded to actually explain what is being done and how. I would also include
in that explanation how sed is being used to reverse a file. Personally, I
would have preferred to keep the dependency on tac for a readability perspective.

/Bruce

  parent reply	other threads:[~2016-07-06  8:12 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-13 11:50 [dpdk-dev] Duplicate config symbols Christian Ehrhardt
2016-06-13 13:07 ` Ferruh Yigit
2016-06-13 13:47 ` Thomas Monjalon
2016-06-13 15:09   ` Christian Ehrhardt
2016-06-13 15:10     ` [dpdk-dev] [RFC] mk: filter duplicate configuration entries Christian Ehrhardt
2016-06-28 16:11       ` Ferruh Yigit
2016-06-28 16:38         ` Christian Ehrhardt
2016-06-28 16:48           ` Ferruh Yigit
2016-06-30 11:57             ` Christian Ehrhardt
2016-06-30 12:00               ` [dpdk-dev] [PATCH v2] " Christian Ehrhardt
2016-07-05 16:47                 ` Ferruh Yigit
2016-07-05 19:47                   ` Thomas Monjalon
2016-07-06  5:37                     ` Christian Ehrhardt
2016-07-06  5:37                       ` [dpdk-dev] [PATCH v3] " Christian Ehrhardt
2016-07-06  8:06                         ` Ferruh Yigit
2016-07-06  8:12                         ` Bruce Richardson [this message]
2016-07-06  8:57                           ` Ferruh Yigit
2016-07-06  9:08                             ` Christian Ehrhardt
2016-07-06  9:13                               ` [dpdk-dev] [PATCH v4] " Christian Ehrhardt
2016-07-11 12:47                                 ` Thomas Monjalon
2016-07-06  9:30                             ` [dpdk-dev] [PATCH v3] " Bruce Richardson
2016-06-13 16:55     ` [dpdk-dev] Duplicate config symbols Thomas Monjalon

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