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Re: [Xen-devel] [PATCH v3 3/3] xen/build: Automatically locate a suitable python interpreter
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 9 Dec 2019 11:00:43 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Steven Haigh <netwiz@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>
- Delivery-date: Mon, 09 Dec 2019 11:00:50 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 12/7/19 9:16 PM, Andrew Cooper wrote:
> Needing to pass PYTHON=python3 into hypervisor builds is irritating and
> unnecessary. Locate a suitable interpreter automatically, defaulting to Py3
> if it is available.
>
> Reported-by: Steven Haigh <netwiz@xxxxxxxxx>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
> CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Wei Liu <wl@xxxxxxx>
> CC: Julien Grall <julien@xxxxxxx>
> CC: Steven Haigh <netwiz@xxxxxxxxx>
> CC: Juergen Gross <jgross@xxxxxxxx>
>
> v2:
> * Cope with `which` not being present in the system.
> * Only evaulate the shell command one, rather than once per $(PTHON) usage
>
> For 4.13. This is a very-nice-to-have WRT our Py3-clean intention.
> ---
> xen/Makefile | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/xen/Makefile b/xen/Makefile
> index 949ca6eb03..f36a5bc6c0 100644
> --- a/xen/Makefile
> +++ b/xen/Makefile
> @@ -13,6 +13,11 @@ export XEN_BUILD_TIME ?= $(shell LC_ALL=C date +%T)
> export XEN_BUILD_HOST ?= $(shell hostname)
> export XEN_CONFIG_EXPERT ?= n
>
> +# Best effort attempt to find a python interpreter, defaulting to Python 3 if
> +# available. Fall back to just `python` if `which` is nowhere to be found.
> +PYTHON_INTERPRETER := $(word 1,$(shell which python3 python python2
> 2>/dev/null) python)
> +export PYTHON ?= $(PYTHON_INTERPRETER)
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
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