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zerovm / zpm

ZeroVM Package Manager
Apache License 2.0
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Produce bare tarballs (not gzipped) on `zpm bundle` #151

Open larsbutler opened 10 years ago

larsbutler commented 10 years ago

In order to make zapps more easily consumable directly by ZeroVM, it would be useful to not gzip .zapp files. As far as I can tell, ZeroVM cannot directly mount a .tar.gz. However, you can mount a zapp directly (using zvsh --zvm-image, for example) if the file is just a tar.

rpedde commented 10 years ago

I agree that if zapps are zerovm system images, then it probably doesn't make sense to gzip them.

pkit commented 10 years ago

Zerocloud supports .gz stuff, but the main idea of gz, I think, was to save traffic when uploading stuff

larsbutler commented 10 years ago

@pkit Yep, that's right. But if we run zapps locally, they can't be gzipped.

This is kind of my vision: to bridge the gap between "images" and "zapps". They're already so close. I would consider python.tar to be a zapp, and I would like to have it in the ZPA. For example.

mgeisler commented 10 years ago

@rpedde

I agree that if zapps are zerovm system images, then it probably doesn't make sense to gzip them.

I would suggest that zerovm should just decompress them on the fly. I'm sure we can put gzip into ZRT and let it decompress the image too when it loads it.

larsbutler commented 10 years ago

Long term, it would good to have gzip support in ZeroVM. But for now, I think we can do without zipping. Assuming everyone actually agrees with treating system images and zapps as the same thing. Which not everyone does, apparently.

mgeisler commented 10 years ago

I don't like using the same file extension for files that are both compressed (on your system) and uncompressed (when deployed into Swift).

However, I just took a look at the python.tar to get a real-world example. Compressing it with gzip brings the size down from 70 MB to 19 MB. That is a much bigger saving than I had expected and this makes me want to push for adding gzip support to ZRT even more.

Maybe @pkit and @YaroslavLitvinov can comment on the feasibility of making zerovm and ZRT transparently decompress a system image when it is loaded? I haven't really worked with gzip in C, but it is my understanding that it is very easy to use.