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Re: [XEN PATCH] build: Replace `which` with `command -v`
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 14 Feb 2024 16:12:58 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 14 Feb 2024 15:13:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.02.2024 15:34, Anthony PERARD wrote:
> The `which` command is not standard, may not exist on the build host,
> or may not behave as expected. It is recommanded to use `command -v`
> to find out if a command exist and have it's path, and it's part of a
> POSIX shell standard.
>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> ---
> xen/Makefile | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/xen/Makefile b/xen/Makefile
> index 21832d6402..767e47d6c7 100644
> --- a/xen/Makefile
> +++ b/xen/Makefile
> @@ -25,8 +25,8 @@ export XEN_BUILD_HOST := $(shell hostname)
> endif
>
> # 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)
> +# available. Fall back to just `python`.
> +PYTHON_INTERPRETER := $(word 1,$(shell command -v python3 || command -v
> python || command -v python2) python)
> export PYTHON ?= $(PYTHON_INTERPRETER)
Shouldn't we go farther with this and also switch the use in
xen/build.mk (which looks to be the only other one I can find under
xen/ and config/)?
Jan
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