tar: file changed as we read it

Question

I am using make and tar to backup. When executing makefile, tar command shows file changed as we read it. In this case,

Answer 1

To enhance Fabian's one-liner; let us say that we want to ignore only exit status 1 but to preserve the exit status if it is anything else:

tar -czf sample.tar.gz dir1 dir2 || ( export ret=$?; [[ $ret -eq 1 ]] || exit "$ret" )

This does everything sandeep's script does, on one line.