Re: [PATCH v6 04/10] git_connect: factor out discovery of the protocol and its parts

> git_connect has grown large due to the many different protocols syntaxes
> that are supported. Move the part of the function that parses the URL to
> connect to into a separate function for readability.
>
> Signed-off-by: Johannes Sixt <j6t@kdbg.org>
> ---

>  connect.c | 80 ++++++++++++++++++++++++++++++++++++++++++---------------------
>  1 file changed, 53 insertions(+), 27 deletions(-)
>
> diff --git a/connect.c b/connect.c
> index 6cc1f8d..a6cf345 100644
> --- a/connect.c
> +++ b/connect.c
> @@ -543,37 +543,20 @@ static char *get_port(char *host)
>  	return NULL;
>  }
>  
> -static struct child_process no_fork;
> -
>  /*
> - * This returns a dummy child_process if the transport protocol does not
> - * need fork(2), or a struct child_process object if it does.  Once done,
> - * finish the connection with finish_connect() with the value returned from
> - * this function (it is safe to call finish_connect() with NULL to support
> - * the former case).
> - *
> - * If it returns, the connect is successful; it just dies on errors (this
> - * will hopefully be changed in a libification effort, to return NULL when
> - * the connection failed).
> + * Extract protocol and relevant parts from the specified connection URL.
> + * The caller must free() the returned strings.
>   */
> -struct child_process *git_connect(int fd[2], const char *url_orig,
> -				  const char *prog, int flags)
> +static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
> +				       char **ret_port, char **ret_path)
>  {
>  	char *url;
>  	char *host, *path;
>  	char *end;
>  	int c;
> -	struct child_process *conn = &no_fork;
>  	enum protocol protocol = PROTO_LOCAL;
>  	int free_path = 0;
>  	char *port = NULL;
> -	const char **arg;
> -	struct strbuf cmd = STRBUF_INIT;
> -
> -	/* Without this we cannot rely on waitpid() to tell
> -	 * what happened to our children.
> -	 */
> -	signal(SIGCHLD, SIG_DFL);
>  
>  	if (is_url(url_orig))
>  		url = url_decode(url_orig);
> @@ -645,6 +628,49 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
>  	if (protocol == PROTO_SSH && host != url)
>  		port = get_port(end);
>  
> +	*ret_host = xstrdup(host);
> +	if (port)
> +		*ret_port = xstrdup(port);
> +	else
> +		*ret_port = NULL;
> +	if (free_path)
> +		*ret_path = path;
> +	else
> +		*ret_path = xstrdup(path);
> +	free(url);
> +	return protocol;
> +}
> +
> +static struct child_process no_fork;
> +
> +/*
> + * This returns a dummy child_process if the transport protocol does not
> + * need fork(2), or a struct child_process object if it does.  Once done,
> + * finish the connection with finish_connect() with the value returned from
> + * this function (it is safe to call finish_connect() with NULL to support
> + * the former case).
> + *
> + * If it returns, the connect is successful; it just dies on errors (this
> + * will hopefully be changed in a libification effort, to return NULL when
> + * the connection failed).
> + */
> +struct child_process *git_connect(int fd[2], const char *url,
> +				  const char *prog, int flags)
> +{
> +	char *host, *path;
> +	struct child_process *conn = &no_fork;
> +	enum protocol protocol;
> +	char *port;
> +	const char **arg;
> +	struct strbuf cmd = STRBUF_INIT;
> +
> +	/* Without this we cannot rely on waitpid() to tell
> +	 * what happened to our children.
> +	 */
> +	signal(SIGCHLD, SIG_DFL);
> +
> +	protocol = parse_connect_url(url, &host, &port, &path);
> +
>  	if (protocol == PROTO_GIT) {
>  		/* These underlying connection commands die() if they
>  		 * cannot connect.
> @@ -666,9 +692,9 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
>  			     prog, path, 0,
>  			     target_host, 0);
>  		free(target_host);
> -		free(url);
> -		if (free_path)
> -			free(path);
> +		free(host);
> +		free(port);
> +		free(path);
>  		return conn;
>  	}
>  
> @@ -709,9 +735,9 @@ struct child_process *git_connect(int fd[2], const char *url_orig,
>  	fd[0] = conn->out; /* read from child's stdout */
>  	fd[1] = conn->in;  /* write to child's stdin */
>  	strbuf_release(&cmd);
> -	free(url);
> -	if (free_path)
> -		free(path);
> +	free(host);
> +	free(port);
> +	free(path);
>  	return conn;
>  }