http-fetch: nicer warning for a server with unreliable 404 status

When a repository otherwise properly prepared is served by a
dumb HTTP server that sends "No such page" output with 200
status for human consumption to a request for a page that does
not exist, the users will get an alarming "File X corrupt" error
message.  Hint that they might be dealing with such a server at
the end and suggest running fsck-objects to check if the result
is OK (the pack-fallback code does the right thing in this case
so unless a loose object file was actually corrupt the result
should check OK).

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

diff --git a/http-fetch.c b/http-fetch.c
index 7de818b109bb057e089da8d086396196c958f444..dc67218ae7caba09add888bc0da165d6c0c10930 100644 (file)
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -8,6 +8,7 @@
 #define RANGE_HEADER_SIZE 30
 
 static int got_alternates = -1;
+static int corrupt_object_found = 0;
 
 static struct curl_slist *no_pragma_header;
 
@@ -834,6 +835,7 @@ static int fetch_object(struct alt_base *repo, unsigned char *sha1)
                                    obj_req->errorstr, obj_req->curl_result,
                                    obj_req->http_code, hex);
        } else if (obj_req->zret != Z_STREAM_END) {
+               corrupt_object_found++;
                ret = error("File %s (%s) corrupt", hex, obj_req->url);
        } else if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
                ret = error("File %s has bad hash", hex);
@@ -993,5 +995,11 @@ int main(int argc, char **argv)
 
        http_cleanup();
 
+       if (corrupt_object_found) {
+               fprintf(stderr,
+"Some loose object were found to be corrupt, but they might be just\n"
+"a false '404 Not Found' error message sent with incorrect HTTP\n"
+"status code.  Suggest running git fsck-objects.\n");
+       }
        return rc;
 }