send-pack: use buffered I/O to talk to pack-objects

We start a pack-objects process and then write all of the
positive and negative sha1s to it over a pipe. We do so by
formatting each item into a fixed-size buffer and then
writing each individually. This has two drawbacks:

  1. There's some manual computation of the buffer size,
     which is not immediately obvious is correct (though it
     is).

  2. We write() once per sha1, which means a lot more system
     calls than are necessary.

We can solve both by wrapping the pipe descriptor in a stdio
handle; this is the same technique used by upload-pack when
serving fetches.

Note that we can also simplify and improve the error
handling here. The original detected a single write error
and broke out of the loop (presumably to avoid writing the
error message over and over), but never actually acted on
seeing an error; we just fed truncated input and took
whatever pack-objects returned.

In practice, this probably didn't matter, as the likely
errors would be caused by pack-objects dying (and we'd
probably just die with SIGPIPE anyway). But we can easily
make this simpler and more robust; the stdio handle keeps an
error flag, which we can check at the end.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/send-pack.c b/send-pack.c
index 37ee04e..299d303 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -36,18 +36,15 @@ int option_parse_push_signed(const struct option *opt,
        die("bad %s argument: %s", opt->long_name, arg);
 }
 
-static int feed_object(const unsigned char *sha1, int fd, int negative)
+static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
 {
-       char buf[42];
-
        if (negative && !has_sha1_file(sha1))
-               return 1;
+               return;
 
-       memcpy(buf + negative, sha1_to_hex(sha1), 40);
        if (negative)
-               buf[0] = '^';
-       buf[40 + negative] = '\n';
-       return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
+               putc('^', fh);
+       fputs(sha1_to_hex(sha1), fh);
+       putc('\n', fh);
 }
 
 /*
@@ -73,6 +70,7 @@ static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, stru
                NULL,
        };
        struct child_process po = CHILD_PROCESS_INIT;
+       FILE *po_in;
        int i;
 
        i = 4;
@@ -97,21 +95,22 @@ static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, stru
         * We feed the pack-objects we just spawned with revision
         * parameters by writing to the pipe.
         */
+       po_in = xfdopen(po.in, "w");
        for (i = 0; i < extra->nr; i++)
-               if (!feed_object(extra->sha1[i], po.in, 1))
-                       break;
+               feed_object(extra->sha1[i], po_in, 1);
 
        while (refs) {
-               if (!is_null_oid(&refs->old_oid) &&
-                   !feed_object(refs->old_oid.hash, po.in, 1))
-                       break;
-               if (!is_null_oid(&refs->new_oid) &&
-                   !feed_object(refs->new_oid.hash, po.in, 0))
-                       break;
+               if (!is_null_oid(&refs->old_oid))
+                       feed_object(refs->old_oid.hash, po_in, 1);
+               if (!is_null_oid(&refs->new_oid))
+                       feed_object(refs->new_oid.hash, po_in, 0);
                refs = refs->next;
        }
 
-       close(po.in);
+       fflush(po_in);
+       if (ferror(po_in))
+               die_errno("error writing to pack-objects");
+       fclose(po_in);
 
        if (args->stateless_rpc) {
                char *buf = xmalloc(LARGE_PACKET_MAX);