[PATCH] filter: set environment variable PYTHONIOENCODING to utf-8

[John Keeping]

On Thu, Feb 23, 2017 at 03:48:23PM +0000, Roy Marples wrote:
> This allows different versions of Python to be used rather than
> forcing version specific encoding in each script.
> 
> Signed-off-by: Roy Marples <roy at marples.name>
> ---
>  filter.c                       | 8 ++++++++
>  filters/email-gravatar.py      | 3 ---
>  filters/syntax-highlighting.py | 5 +----
>  3 files changed, 9 insertions(+), 7 deletions(-)

Neat!  This definitely makes writing it easier to get it right with
Python filters, but having filter_env_set seems unnecessary.

Is there a reason not to either:

1) set PYTHONIOENCODING unconditionally early in startup

or

2) set the environment in the child after forking

?

> diff --git a/filter.c b/filter.c
> index 949c931..3c0f978 100644
> --- a/filter.c
> +++ b/filter.c
> @@ -15,6 +15,8 @@
>  #include <lauxlib.h>
>  #endif
>  
> +static bool filter_env_set;
> +
>  static inline void reap_filter(struct cgit_filter *filter)
>  {
>  	if (filter && filter->cleanup)
> @@ -44,6 +46,12 @@ static int open_exec_filter(struct cgit_filter *base, va_list ap)
>  	struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
>  	int i;
>  
> +	if (!filter_env_set) {
> +		/* Always input/output utf-8 for a Python filter. */
> +		setenv("PYTHONIOENCODING", "utf-8", 1);
> +		filter_env_set = true;
> +	}
> +
>  	for (i = 0; i < filter->base.argument_count; i++)
>  		filter->argv[i + 1] = va_arg(ap, char *);
>  
> diff --git a/filters/email-gravatar.py b/filters/email-gravatar.py
> index d70440e..8b98471 100755
> --- a/filters/email-gravatar.py
> +++ b/filters/email-gravatar.py
> @@ -30,9 +30,6 @@ if email[-1] == '>':
>  
>  page = sys.argv[2]
>  
> -sys.stdin = codecs.getreader("utf-8")(sys.stdin.detach())
> -sys.stdout = codecs.getwriter("utf-8")(sys.stdout.detach())
> -
>  md5 = hashlib.md5(email.encode()).hexdigest()
>  text = sys.stdin.read().strip()
>  
> diff --git a/filters/syntax-highlighting.py b/filters/syntax-highlighting.py
> index 5888b50..936fdb7 100755
> --- a/filters/syntax-highlighting.py
> +++ b/filters/syntax-highlighting.py
> @@ -29,9 +29,6 @@ from pygments.lexers import guess_lexer
>  from pygments.lexers import guess_lexer_for_filename
>  from pygments.formatters import HtmlFormatter
>  
> -
> -sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8', errors='replace')
> -sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
>  data = sys.stdin.read()
>  filename = sys.argv[1]
>  formatter = HtmlFormatter(style='pastie')
> @@ -52,4 +49,4 @@ except TypeError:
>  sys.stdout.write('<style>')
>  sys.stdout.write(formatter.get_style_defs('.highlight'))
>  sys.stdout.write('</style>')
> -sys.stdout.write(highlight(data, lexer, formatter, outfile=None))
> +highlight(data, lexer, formatter, outfile=sys.stdout)
> -- 
> 2.11.1
> 
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