> On 07 Apr 2017, at 14:03, Ben Peart <peartben@xxxxxxxxx> wrote:
>
> To enable future reuse of the filter.<driver>.process infrastructure,
> split start_multi_file_filter into two separate parts.
>
> start_multi_file_filter will now only contain the generic logic to
> manage the creation and tracking of the child process in a hashmap.
>
> start_multi_file_filter_fn is a protocol specific initialization
> function that will negotiate the multi-file-filter interface version
> and capabilities.
>
> Signed-off-by: Ben Peart <benpeart@xxxxxxxxxxxxx>
> ---
> convert.c | 63 ++++++++++++++++++++++++++++++++++++++-------------------------
> 1 file changed, 38 insertions(+), 25 deletions(-)
>
> diff --git a/convert.c b/convert.c
> index 793c29ebfd..404757eac9 100644
> --- a/convert.c
> +++ b/convert.c
> @@ -565,35 +565,14 @@ static void stop_multi_file_filter(struct child_process *process)
> finish_command(process);
> }
>
> -static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, const char *cmd)
> +static int start_multi_file_filter_fn(struct cmd2process *entry)
> {
> int err;
> - struct cmd2process *entry;
> - struct child_process *process;
> - const char *argv[] = { cmd, NULL };
> struct string_list cap_list = STRING_LIST_INIT_NODUP;
> char *cap_buf;
> const char *cap_name;
> -
> - entry = xmalloc(sizeof(*entry));
> - entry->cmd = cmd;
> - entry->supported_capabilities = 0;
> - process = &entry->process;
> -
> - child_process_init(process);
> - process->argv = argv;
> - process->use_shell = 1;
> - process->in = -1;
> - process->out = -1;
> - process->clean_on_exit = 1;
> - process->clean_on_exit_handler = stop_multi_file_filter;
> -
> - if (start_command(process)) {
> - error("cannot fork to run external filter '%s'", cmd);
> - return NULL;
> - }
> -
> - hashmap_entry_init(entry, strhash(cmd));
> + struct child_process *process = &entry->process;
> + const char *cmd = entry->cmd;
>
> sigchain_push(SIGPIPE, SIG_IGN);
>
> @@ -642,7 +621,41 @@ static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, cons
> done:
> sigchain_pop(SIGPIPE);
>
> - if (err || errno == EPIPE) {
> + if (err || errno == EPIPE)
> + err = err ? err : errno;
Nice! I should have done this here, too:
https://github.com/git/git/blob/b14f27f91770e0f99f64135348977a0ce1c7993a/convert.c#L755
This is clearly a bug in my code. I'll send a patch shortly.
> +
> + return err;
> +}
> +
> +static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, const char *cmd)
> +{
> + int err;
> + struct cmd2process *entry;
> + struct child_process *process;
> + const char *argv[] = { cmd, NULL };
> +
> + entry = xmalloc(sizeof(*entry));
> + entry->cmd = cmd;
> + entry->supported_capabilities = 0;
> + process = &entry->process;
> +
> + child_process_init(process);
> + process->argv = argv;
> + process->use_shell = 1;
> + process->in = -1;
> + process->out = -1;
> + process->clean_on_exit = 1;
> + process->clean_on_exit_handler = stop_multi_file_filter;
> +
> + if (start_command(process)) {
> + error("cannot fork to run external filter '%s'", cmd);
> + return NULL;
> + }
> +
> + hashmap_entry_init(entry, strhash(cmd));
> +
> + err = start_multi_file_filter_fn(entry);
> + if (err) {
> error("initialization for external filter '%s' failed", cmd);
> kill_multi_file_filter(hashmap, entry);
> return NULL;
> --
> 2.12.0.windows.1.31.g1548525701.dirty
Looks good to me.
Thanks,
Lars