Re: [PATCH] t9020: use configured Python to run test helper

> The test helper svnrdump_sim.py is used as "svnrdump" during the
> execution of this test, but the arrangement had a few undesirable
> things:
> 
>  - it relied on symbolic links;
>  - unportable "export VAR=VAL" was used;
>  - GIT_BUILD_DIR variable was not quoted correctly;
>  - it assumed that the Python interpreter is in /usr/bin/ and
>    called "python" (i.e. not "python2.7" etc.)
> 
> Rework this by writing a small shell script that spawns the right
> Python interpreter, using the right quoting.
> 
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
> 
>  * The analysis above counts more bugs than the number of lines that
>    are deleted in this section of the code...
> 
>  t/t9020-remote-svn.sh | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/t/t9020-remote-svn.sh b/t/t9020-remote-svn.sh
> index 4f2dfe0..d7be66a 100755
> --- a/t/t9020-remote-svn.sh
> +++ b/t/t9020-remote-svn.sh
> @@ -12,9 +12,13 @@ then
>  	test_done
>  fi
>  
> -# We override svnrdump by placing a symlink to the svnrdump-emulator in .
> -export PATH="$HOME:$PATH"
> -ln -sf $GIT_BUILD_DIR/contrib/svn-fe/svnrdump_sim.py "$HOME/svnrdump"
> +# Override svnrdump with our simulator
> +PATH="$HOME:$PATH"
> +export PATH PYTHON_PATH GIT_BUILD_DIR
> +
> +write_script "$HOME/svnrdump" <<\EOF
> +exec "$PYTHON_PATH" "$GIT_BUILD_DIR/contrib/svn-fe/svnrdump_sim.py" "$@"
> +EOF