http-fetch.c: consolidate code to detect missing fetch target

At a handful places we check two error codes from curl library
to see if the file we asked was missing from the remote (e.g.
we asked for a loose object when it is in a pack) to decide what
to do next.  This consolidates the check into a single function.

NOTE: the original did not check for HTTP_RETURNED_ERROR when
error code is 404, but this version does to make sure 404 is
from HTTP and not some other protcol.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/http-fetch.c b/http-fetch.c
index a113bb8c4b0c8d59b5b6df3c7689ba9f50818753..98cf52db463d7f526e9583379e93902e4e3571af 100644 (file)
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -144,6 +144,17 @@ static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
        return size;
 }
 
+static int missing__target(int code, int result)
+{
+       return  /* file:// URL -- do we ever use one??? */
+               (result == CURLE_FILE_COULDNT_READ_FILE) ||
+               /* http:// and https:// URL */
+               (code == 404 && result == CURLE_HTTP_RETURNED_ERROR)
+               ;
+}
+
+#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
+
 static void fetch_alternates(const char *base);
 
 static void process_object_response(void *callback_data);
@@ -323,8 +334,7 @@ static void process_object_response(void *callback_data)
        obj_req->state = COMPLETE;
 
        /* Use alternates if necessary */
-       if (obj_req->http_code == 404 ||
-           obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+       if (missing_target(obj_req)) {
                fetch_alternates(alt->base);
                if (obj_req->repo->next != NULL) {
                        obj_req->repo =
@@ -537,8 +547,7 @@ static void process_alternates_response(void *callback_data)
                        return;
                }
        } else if (slot->curl_result != CURLE_OK) {
-               if (slot->http_code != 404 &&
-                   slot->curl_result != CURLE_FILE_COULDNT_READ_FILE) {
+               if (!missing_target(slot)) {
                        got_alternates = -1;
                        return;
                }
@@ -941,8 +950,7 @@ static int fetch_indices(struct alt_base *repo)
        if (start_active_slot(slot)) {
                run_active_slot(slot);
                if (results.curl_result != CURLE_OK) {
-                       if (results.http_code == 404 ||
-                           results.curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+                       if (missing_target(&results)) {
                                repo->got_indices = 1;
                                free(buffer.buffer);
                                return 0;
@@ -1123,8 +1131,7 @@ static int fetch_object(struct alt_base *repo, unsigned char *sha1)
                ret = error("Request for %s aborted", hex);
        } else if (obj_req->curl_result != CURLE_OK &&
                   obj_req->http_code != 416) {
-               if (obj_req->http_code == 404 ||
-                   obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE)
+               if (missing_target(obj_req))
                        ret = -1; /* Be silent, it is probably in a pack. */
                else
                        ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",