Build different versions of mozjpeg

[ThibaultLemaire]

If I don't need the latest mozjpeg but rather, say, v3.0, it would be nice to be able to configure this image to build a given git tag from mozilla/mozjpeg.

Ideally this tag would also be used as a docker tag on the docker hub.

[egorovli]

Hi, @ThibaultLemaire 👋 I would be really happy to accept a PR for this feature!

[ThibaultLemaire]

Well I've been looking into it, and apparently mozjpeg only recently adopted cmake based compilation. Which is a problem because your script, as is, basically works only for the latest version.

I have tried and failed to checkout other tags and build with cmake. Even v3.3.2 (the latest as far as I can tell judging from the github release page) doesn't build that way.

So I'm afraid this won't be as trivial as I first anticipated.

[egorovli]

@ThibaultLemaire I've updated the Dockerfile to be able to build a custom version of mozjpeg. Tested with all tags starting from 2.0.

docker build -t mozjpeg-docker --build-arg tag=v3.0 .

[egorovli]

OK, apparently I've tested all tags except master. Master throws autoreconf: 'configure.ac' or configure.in' is required, related to #1.

[ThibaultLemaire]

Thank you very much, now I can build the version I need. Do you think you could push some tagged versions to the DockerHub like major images do?

But I see you had to switch back to autotools for it to work. Doesn't that bother you? How do you plan on supporting newer versions?

[egorovli]

I pushed the 3.0 tag manually: https://hub.docker.com/r/egorovli/mozjpeg.

FROM egorovli/mozjpeg:3.0

Cheers!