http.c: Don't store destination name in request structures

The destination name within the object store is easily computed
on demand, reusing a static buffer held by sha1_file.c.  We don't
need to copy the entire path into the request structure for safe
keeping, when it can be easily reformatted after the download has
been completed.

This reduces the size of the per-request structure, and removes
yet another PATH_MAX based limit.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-walker.c

@@ -510,7 +510,7 @@ static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned c
 		ret = error("File %s has bad hash", hex);
 	} else if (req->rename < 0) {
 		ret = error("unable to write sha1 filename %s",
-			    req->filename);
+			    sha1_file_name(req->sha1));
 	}
 
 	release_http_object_request(req);

http.c

@@ -1014,7 +1014,7 @@ int finish_http_pack_request(struct http_pack_request *preq)
 		lst = &((*lst)->next);
 	*lst = (*lst)->next;
 
-	ret = move_temp_to_file(preq->tmpfile, preq->filename);
+	ret = move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1));
 	if (ret)
 		return ret;
 	if (verify_pack(p))
@@ -1043,7 +1043,6 @@ struct http_pack_request *new_http_pack_request(
 	preq->url = strbuf_detach(&buf, NULL);
 
 	filename = sha1_pack_name(target->sha1);
-	snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
 	snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
 	preq->packfile = fopen(preq->tmpfile, "a");
 	if (!preq->packfile) {
@@ -1133,7 +1132,6 @@ struct http_object_request *new_http_object_request(const char *base_url,
 	freq->localfile = -1;
 
 	filename = sha1_file_name(sha1);
-	snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
 	snprintf(freq->tmpfile, sizeof(freq->tmpfile),
 		 "%s.temp", filename);
 
@@ -1162,8 +1160,8 @@ struct http_object_request *new_http_object_request(const char *base_url,
 	}
 
 	if (freq->localfile < 0) {
-		error("Couldn't create temporary file %s for %s: %s",
-		      freq->tmpfile, freq->filename, strerror(errno));
+		error("Couldn't create temporary file %s: %s",
+		      freq->tmpfile, strerror(errno));
 		goto abort;
 	}
 
@@ -1210,8 +1208,8 @@ struct http_object_request *new_http_object_request(const char *base_url,
 			prev_posn = 0;
 			lseek(freq->localfile, 0, SEEK_SET);
 			if (ftruncate(freq->localfile, 0) < 0) {
-				error("Couldn't truncate temporary file %s for %s: %s",
-					  freq->tmpfile, freq->filename, strerror(errno));
+				error("Couldn't truncate temporary file %s: %s",
+					  freq->tmpfile, strerror(errno));
 				goto abort;
 			}
 		}
@@ -1287,7 +1285,7 @@ int finish_http_object_request(struct http_object_request *freq)
 		return -1;
 	}
 	freq->rename =
-		move_temp_to_file(freq->tmpfile, freq->filename);
+		move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
 
 	return freq->rename;
 }

http.h

@@ -152,7 +152,6 @@ struct http_pack_request
 	struct packed_git *target;
 	struct packed_git **lst;
 	FILE *packfile;
-	char filename[PATH_MAX];
 	char tmpfile[PATH_MAX];
 	struct curl_slist *range_header;
 	struct active_request_slot *slot;
@@ -167,7 +166,6 @@ extern void release_http_pack_request(struct http_pack_request *preq);
 struct http_object_request
 {
 	char *url;
-	char filename[PATH_MAX];
 	char tmpfile[PATH_MAX];
 	int localfile;
 	CURLcode curl_result;