Re: [PATCH v4 4/4] ci: install python on ubuntu

[Junio C Hamano <gitster@pobox.com>]

Jiang Xin <worldhello.net@gmail.com> writes:

> From: Jiang Xin <zhiyou.jx@alibaba-inc.com>
>
> Python is missing from the default ubuntu-22.04 runner image, which
> prevent git-p4 from working. To install python on ubuntu, we need to
> provide correct package name:
>
>  * On Ubuntu 18.04 (bionic), "/usr/bin/python2" is provided by the
>    "python" package, and "/usr/bin/python3" is provided by the "python3"
>    package.
>
>  * On Ubuntu 20.04 (focal) and above, "/usr/bin/python2" is provided by
>    the "python2" package which has a different name from bionic, and
>    "/usr/bin/python3" is provided by "python3".
>
> Since the "ubuntu-latest" runner image has a higher version, so its safe
> to use "python2" or "python3" package name.

Makes sense.  Just out of curiousity (read: not a suggestion to
change anything), what happens if you say "apt install python" on a
recent system?

Will queue.  Thanks.

> Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
> ---
>  ci/install-dependencies.sh | 2 +-
>  ci/lib.sh                  | 8 ++++----
>  2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
> index b569893b38..d8fafc8ed2 100755
> --- a/ci/install-dependencies.sh
> +++ b/ci/install-dependencies.sh
> @@ -15,7 +15,7 @@ case "$runs_on_pool" in
>  ubuntu-*)
>  	sudo apt-get -q update
>  	sudo apt-get -q -y install language-pack-is libsvn-perl apache2 \
> -		$UBUNTU_COMMON_PKGS $CC_PACKAGE
> +		$UBUNTU_COMMON_PKGS $CC_PACKAGE $PYTHON_PACKAGE
>  	mkdir --parents "$P4_PATH"
>  	pushd "$P4_PATH"
>  		wget --quiet "$P4WHENCE/bin.linux26x86_64/p4d"
> diff --git a/ci/lib.sh b/ci/lib.sh
> index 927b4529b0..cb30699f34 100755
> --- a/ci/lib.sh
> +++ b/ci/lib.sh
> @@ -232,12 +232,12 @@ ubuntu-*)
>  		break
>  	fi
>  
> -	if [ "$jobname" = linux-gcc ]
> +	PYTHON_PACKAGE=python2
> +	if test "$jobname" = linux-gcc
>  	then
> -		MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/python3"
> -	else
> -		MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/python2"
> +		PYTHON_PACKAGE=python3
>  	fi
> +	MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/$PYTHON_PACKAGE"
>  
>  	export GIT_TEST_HTTPD=true