Using libuuid to generate uuids

[nolan-veed]

Why

For #692

What

• Created target_nouuid and target_libuuid dirs.
  • Moved uuid.cpp to target_nouuid.
  • Created new uuid.cpp in target_libuuid that uses libuuid to create a uuid_t and unparse it into the supplied buffer.
• Added test.
• Did other scons changes.

Testing

Added a success test case. Failure test case panics - so can't add one.

[github-actions]

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[nolan-veed]

@gavv
I'm assuming, we'll need to adjust the dockerfiles repo to install libuuid where available? Any suggestions on which envs should have them?

[gavv]

I'm assuming, we'll need to adjust the dockerfiles repo to install libuuid where available? Any suggestions on which envs should have them?

Yes. I think it can be added to all envs except env-ubuntu:nolibs (which is used to test build when no system dependencies are pre-installed).

I guess it'd be same as https://github.com/roc-streaming/dockerfiles/pull/17/files

---

Also, we need to add libuuid to build-3rdparty.py: https://github.com/roc-streaming/roc-toolkit/blob/develop/scripts/scons_helpers/build-3rdparty.py

(The task has a link to example PR that adds a dependency there)

build-3rdparty.py will be used when you run scons --build-3rdparty=libuuid or scons --build-3rdparty=all.

On CI, we should use --build-3rdparty=libuuid in cross-compilations steps.

[gavv]

LGTM! Only one small comment.

[nolan-veed]

Also, we need to add libuuid to build-3rdparty.py: https://github.com/roc-streaming/roc-toolkit/blob/develop/scripts/scons_helpers/build-3rdparty.py

I didn't understand this. Can you confirm that we should be building libuuid from source? Shouldn't we just be using what the distro has provided? I thought we were just either using the distro's libuuid or providing the ability to disable it.

(Happy to try and build it from source, if needed.)

[gavv]

Hi, sorry for delay.

I didn't understand this. Can you confirm that we should be building libuuid from source? Shouldn't we just be using what the distro has provided? I thought we were just either using the distro's libuuid or providing the ability to disable it.

Yes, but that's not done by default though.

We have --build-3rdparty option: https://roc-streaming.org/toolkit/docs/building/developer_cookbook.html#building-dependencies

When it's used, internally we call 3rdparty.py script with a dozen of options.

User can tell scons to build any dependency of roc (or all of them).

It is particularly useful in two cases:

• When a dependency is not widely available, like openfec. Without --build-3rdparty the user would need to build that dependency from sources and provides path to it to roc.

• When you're cross-compiling. Without --build-3rdparty user would need to setup a proper sysroot, cross-compile all dependencies by hand (or using some tool like crosstool), then build roc.

This option exists just for convenience - this makes building roc from sources much easier for most users.

In case of libuuid, I think it is available in every distro, so the main use case for auto-building it will be using --build-3rdparty=all when cross-compiling, e.g. like described here: https://roc-streaming.org/toolkit/docs/building/user_cookbook.html#linux-cross-compile

[gavv]

Hi, I see that it's still WIP, just a few remarks:

• It's better to use tarball URL from here instead of github.

  Github source tarballs don't have configure, so we have to generate them using autogen, but tarballs from kernel.org are dist-tarballs with pre-generated configure. When it's available, it's always better to use pre-generated one, because autotools are moody and can work differently depending on your local versions of autoconf archive, aclocal, etc. These dist-tarballs with pre-generated configure are actually the intended way to distribute autotools projects.

• ARM builds are failing because we need to add libuuid to --build-3rdparty in scripts/ci_checks/linux-arm.

  For some reason those scripts list dependencies manually, but I can't see why. I suggest to try using --build-3rdparty=all in those scripts instead.

• Other scripts are failing because github source tarball weirdly names directories as 1.2.3 instead of project-1.2.3. Tarballs from kernel.org don't have this problem.

• Please also add --disable-libuuid to first two steps in conditional-build.sh. This way our CI will check that we can build both with and without libuuid.

[nolan-veed]

Hi, I see that it's still WIP, just a few remarks:

Thanks for this. I'll pick it up.