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Bash Script: flexishacheck

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7/25/2016 - Bash Script: flexishacheck (Software)


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Bash Script: flexishacheck
Monday, July 25th, 2016
13:07:57 GMT


Here's a boring but useful enough Bash script I finished today:


I made this because the not-yet-finished (nor released) renovated Apollia's Puppy Linux Setup Kit (APSK) is going to use SHA-512 checksums to verify that various files are intact, or got downloaded correctly.

Actually, if I recall correctly, the released APSK already does check the SHA-512 checksums of downloaded files. But I want the renovated APSK to be far more flexible - and flexishacheck definitely helps with that, since now I won't have to update checksum record files just because a checksummed file got renamed.

I also want the renovated APSK to be able to use other things to verify that downloaded files are intact, such as GPG signatures.

From what I understand, two different files sharing the same SHA checksum or GPG signature is supposed to be extremely rare, even if the two files are only slightly different. But unfortunately, I'm quite far from understanding all this stuff as well as I'd like, so I'm not sure how helpful (or not) SHA checksums and GPG signatures will really be. But I assume checking SHA checksums and/or GPG signatures is at least better than just blindly trusting that a download succeeded and got the correct file.

At least I've been learning a lot from my struggles to renovate APSK and understand checksums and GPG. At this rate, I don't know if I'll have APSK renovated even before the year is over, but, I'm going to keep trying.

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