http.c: implement the GIT_TRACE_CURL environment variable

Implement the GIT_TRACE_CURL environment variable to allow a
greater degree of detail of GIT_CURL_VERBOSE, in particular
the complete transport header and all the data payload exchanged.
It might be useful if a particular situation could require a more
thorough debugging analysis. Document the new GIT_TRACE_CURL
environment variable.

Helped-by: Torsten Bögershausen <tboegi@web.de>
Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/http.h b/http.h
index 4ef4bbda7d..2fb56d0743 100644
--- a/http.h
+++ b/http.h
@@ -224,4 +224,6 @@ extern int finish_http_object_request(struct http_object_request *freq);
 extern void abort_http_object_request(struct http_object_request *freq);
 extern void release_http_object_request(struct http_object_request *freq);
 
+/* setup routine for curl_easy_setopt CURLOPT_DEBUGFUNCTION */
+void setup_curl_trace(CURL *handle);
 #endif /* HTTP_H */