Implements the GIT_CURL_DEBUG 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.

Signed-off-by: Elia Pinto <gitter.spi...@gmail.com>
---
 imap-send.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 97 insertions(+), 2 deletions(-)

diff --git a/imap-send.c b/imap-send.c
index 4d3b773..cf79e7f 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -1395,6 +1395,96 @@ static int append_msgs_to_imap(struct imap_server_conf 
*server,
 }
 
 #ifdef USE_CURL_FOR_IMAP_SEND
+
+static
+void curl_dump(const char *text,
+         FILE * stream, unsigned char *ptr, size_t size, char nohex)
+{
+       size_t i;
+       size_t c;
+
+       unsigned int width = 0x10;
+
+       if (nohex)
+               /* without the hex output, we can fit more on screen */
+               width = 0x40;
+
+       fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n",
+               text, (long)size, (long)size);
+
+       for (i = 0; i < size; i += width) {
+
+               fprintf(stream, "%4.4lx: ", (long)i);
+
+               if (!nohex) {
+                       /* hex not disabled, show it */
+                       for (c = 0; c < width; c++)
+                               if (i + c < size)
+                                       fprintf(stream, "%02x ", ptr[i + c]);
+                               else
+                                       fputs("   ", stream);
+               }
+
+               for (c = 0; (c < width) && (i + c < size); c++) {
+                       /* check for 0D0A; if found, skip past and start a new 
line of output */
+                       if (nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D
+                           && ptr[i + c + 1] == 0x0A) {
+                               i += (c + 2 - width);
+                               break;
+                       }
+                       fprintf(stream, "%c",
+                               (ptr[i + c] >= 0x20)
+                               && (ptr[i + c] < 0x80) ? ptr[i + c] : '.');
+                       /* check again for 0D0A, to avoid an extra \n if it's 
at width */
+                       if (nohex && (i + c + 2 < size)
+                           && ptr[i + c + 1] == 0x0D
+                           && ptr[i + c + 2] == 0x0A) {
+                               i += (c + 3 - width);
+                               break;
+                       }
+               }
+               fputc('\n', stream);    /* newline */
+       }
+       fflush(stream);
+}
+
+static
+int curl_trace(CURL * handle, curl_infotype type,
+            char *data, size_t size, void *userp)
+{
+       const char *text;
+       (void)handle;           /* prevent compiler warning */
+
+       switch (type) {
+       case CURLINFO_TEXT:
+               fprintf(stderr, "== Info: %s", data);
+       default:                /* in case a new one is introduced to shock us 
*/
+               return 0;
+
+       case CURLINFO_HEADER_OUT:
+               text = "=> Send header";
+               break;
+       case CURLINFO_DATA_OUT:
+               text = "=> Send data";
+               break;
+       case CURLINFO_SSL_DATA_OUT:
+               text = "=> Send SSL data";
+               break;
+       case CURLINFO_HEADER_IN:
+               text = "<= Recv header";
+               break;
+       case CURLINFO_DATA_IN:
+               text = "<= Recv data";
+               break;
+       case CURLINFO_SSL_DATA_IN:
+               text = "<= Recv SSL data";
+               break;
+       }
+
+       curl_dump(text, stderr, (unsigned char *)data, size, 1);
+       return 0;
+}
+
 static CURL *setup_curl(struct imap_server_conf *srvc)
 {
        CURL *curl;
@@ -1442,8 +1532,13 @@ static CURL *setup_curl(struct imap_server_conf *srvc)
 
        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
 
-       if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
-               curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+       if (0 < verbosity )
+               if (getenv("GIT_CURL_DEBUG")) {
+                       curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+                       curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, 
curl_trace);
+               } else if (getenv("GIT_CURL_VERBOSE"))
+                       curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+
 
        return curl;
 }
-- 
2.7.0.416.gbf6b42c.dirty

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