+ : 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=20 bs=1 conv=notrunc seek=$l &&
+ if git-verify-pack test-3.pack
+ then false
+ else :;
+ fi &&
+