Fix pack.packSizeLimit and --max-pack-size handling

If the limit was sufficiently low, having a single object written
could bust the limit (by design), but caused the remaining allowed
size to go negative for subsequent objects, which for an unsigned
variable is a rather huge limit.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index b0dddbee4f93de462090218554e1b1b6d1038c34..8fe51244e069da96b669c260a37f4b7cf831026f 100644 (file)
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -245,8 +245,16 @@ static unsigned long write_object(struct sha1file *f,
        type = entry->type;
 
        /* write limit if limited packsize and not first object */
-       limit = pack_size_limit && nr_written ?
-                       pack_size_limit - write_offset : 0;
+       if (!pack_size_limit || !nr_written)
+               limit = 0;
+       else if (pack_size_limit <= write_offset)
+               /*
+                * the earlier object did not fit the limit; avoid
+                * mistaking this with unlimited (i.e. limit = 0).
+                */
+               limit = 1;
+       else
+               limit = pack_size_limit - write_offset;
 
        if (!entry->delta)
                usable_delta = 0;       /* no delta */

diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index 3a0ef8759c9d7a55b95c56ca38cd3c37ac2432fa..2852a0326546f50f0cbefb4d5621c889b52f33c9 100755 (executable)
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -375,4 +375,10 @@ test_expect_success 'index-pack with --strict' '
        )
 '
 
+test_expect_success 'tolerate absurdly small packsizelimit' '
+       git config pack.packSizeLimit 2 &&
+       packname_9=$(git pack-objects test-9 <obj-list) &&
+       test $(wc -l <obj-list) = $(ls test-9-*.pack | wc -l)
+'
+
 test_done