Re: [PATCH/RFC v3 03/16] Add svndump_init_fd to allow reading dumps from arbitrary FDs.

> The existing function only allows reading from a filename or
> from stdin. Allow passing of a FD and an additional FD for
> the back report pipe. This allows us to retrieve the name of
> the pipe in the caller.
>
> Fixes the filename could be NULL bug.

> Signed-off-by: Florian Achleitner <florian.achleitner.2.6.31@gmail.com>
> ---
> - dup input file descriptor, because buffer_deinit closes the fd.
>  vcs-svn/svndump.c |   22 ++++++++++++++++++----
>  vcs-svn/svndump.h |    1 +
>  2 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/vcs-svn/svndump.c b/vcs-svn/svndump.c
> index 2b168ae..d81a078 100644
> --- a/vcs-svn/svndump.c
> +++ b/vcs-svn/svndump.c
> @@ -468,11 +468,9 @@ void svndump_read(const char *url)
>  		end_revision();
>  }
>  
> -int svndump_init(const char *filename)
> +static void init(int report_fd)
>  {
> -	if (buffer_init(&input, filename))
> -		return error("cannot open %s: %s", filename, strerror(errno));
> -	fast_export_init(REPORT_FILENO);
> +	fast_export_init(report_fd);
>  	strbuf_init(&dump_ctx.uuid, 4096);
>  	strbuf_init(&dump_ctx.url, 4096);
>  	strbuf_init(&rev_ctx.log, 4096);
> @@ -482,6 +480,22 @@ int svndump_init(const char *filename)
>  	reset_dump_ctx(NULL);
>  	reset_rev_ctx(0);
>  	reset_node_ctx(NULL);
> +	return;
> +}
> +
> +int svndump_init(const char *filename)
> +{
> +	if (buffer_init(&input, filename))
> +		return error("cannot open %s: %s", filename ? filename : "NULL", strerror(errno));
> +	init(REPORT_FILENO);
> +	return 0;
> +}
> +
> +int svndump_init_fd(int in_fd, int back_fd)
> +{
> +	if(buffer_fdinit(&input, xdup(in_fd)))
> +		return error("cannot open fd %d: %s", in_fd, strerror(errno));
> +	init(xdup(back_fd));
>  	return 0;
>  }
>  
> diff --git a/vcs-svn/svndump.h b/vcs-svn/svndump.h
> index df9ceb0..acb5b47 100644
> --- a/vcs-svn/svndump.h
> +++ b/vcs-svn/svndump.h
> @@ -2,6 +2,7 @@
>  #define SVNDUMP_H_
>  
>  int svndump_init(const char *filename);
> +int svndump_init_fd(int in_fd, int back_fd);
>  void svndump_read(const char *url);
>  void svndump_deinit(void);
>  void svndump_reset(void);