[Buildroot] [PATCHv3] core: enhance printvars
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Wed Mar 29 20:19:29 UTC 2017
Hello,
On Wed, 29 Mar 2017 11:43:05 +0200, Yann E. MORIN wrote:
> Currently, the output of printvars copntains the name of the variable,
> its expanded value and its un-expanded value.
>
> However, most of the time, we need the actual, expanded value, so it can
> be re-used from a (non-Buildroot) infrastructure script, like a
> post-build script, or a build-farm driver (e.g. a Jenkins job...)
>
> Add two options that a user may set to change the output of printvars:
> - QUOTED_VARS, if set, will quote the value
> - RAW_VARS, if set, will print the unexpanded value
>
> The new output by default only prints the expanded value now.
>
> So that it can be used as such:
>
> $ make -s printvars VARS=BUSYBOX_VERSION
> BUSYBOX_VERSION=1.26.2
>
> $ make -s printvars VARS=BUSYBOX_RDEPENDENCIES QUOTED_VARS=YES
> BUSYBOX_RDEPENDENCIES='ncurses util-linux'
>
> $ make -s printvars VARS=BUSYBOX_FINAL_PATCH_DEPENDENCIES RAW_VARS=YES
> BUSYBOX_FINAL_PATCH_DEPENDENCIES=$(sort $(BUSYBOX_PATCH_DEPENDENCIES))
>
> And it is even possible to directly evaluate it in a shell script:
>
> eval $(make -s printvars VARS=BUSYBOX_VERSION QUOTED_VARS=YES)
>
> Backward compatibility of the output is not maintained. It is believed
> that scripts that depended on the previous output were very fragile to
> begin with, because they had to filter the non-formatted output
> (splitting on spaces or braces was not really possible, because values
> could contain either).
>
> Document printvars and its options in the manual; list it in the output
> of 'make help'.
>
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> Cc: Thomas De Schampheleire <patrickdepinguin at gmail.com>
> Cc: Arnout Vandecappelle <arnout at mind.be>
>
> ---
> Changes v2 -> v3:
> - properly quote values with quotes in them (Arnout)
> - typo in manual (Arnout)
> - fix shell-eval example
> - reword output of 'make help'
Applied to master, thanks.
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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