t5300: avoid false failures.
Johannes found that the test has 1/256 chance of falsely
producing an uncorrupted idx file, causing the check to detect
corruption fail. Now we have 1/2^160 chance of false failure
;-).
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index 7dfb1ab..1510ea9 100755
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -142,6 +142,7 @@
else :;
fi &&
+ : PACK_SIGNATURE &&
cp test-1-${packname_1}.pack test-3.pack &&
dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=2 &&
if git-verify-pack test-3.idx
@@ -149,6 +150,7 @@
else :;
fi &&
+ : PACK_VERSION &&
cp test-1-${packname_1}.pack test-3.pack &&
dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=7 &&
if git-verify-pack test-3.idx
@@ -156,6 +158,7 @@
else :;
fi &&
+ : TYPE/SIZE byte of the first packed object data &&
cp test-1-${packname_1}.pack test-3.pack &&
dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=12 &&
if git-verify-pack test-3.idx
@@ -163,8 +166,11 @@
else :;
fi &&
+ : sum of the index file itself &&
+ l=`wc -c <test-3.idx` &&
+ l=`expr "$l" - 20` &&
cp test-1-${packname_1}.pack test-3.pack &&
- dd if=/dev/zero of=test-3.idx count=1 bs=1 conv=notrunc seek=1200 &&
+ dd if=/dev/zero of=test-3.idx count=20 bs=1 conv=notrunc seek=$l &&
if git-verify-pack test-3.pack
then false
else :;
