I have two identical folders, with same structure and contents like this:
folder_1 hello.txt subfolder byebye.txt folder_2 hello.txt subfolder byebye.txt
if I compress them as tar.xz formats I get two different archives with two different file sizes (just a few bytes, but they're not identical).
$ cd folder_1 && tar -Jcf archive.tar.xz * $ cd folder_2 && tar -Jcf archive.tar.xz *
folder_1/archive.tar.xz != folder_2/archive.tar.xz
and of course if I
sha1sum them I'll get two different hashes
And that's my problem... I need to check if a provided archive is identical to the one I have in my storage. I cannot use hashing nor just check file sizes.
Using zip instead of tar.xz works as zip always produces identical achives from identical files. Why is this happening? Is there a way to prevent it?