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
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