Add daita as a custom config name

[MarkusPettersson98]

This PR adds support for gating DAITA behind a cfg option. This makes it way easier to track what code is strictly DAITA-related, as well as enabling DAITA support on other platforms down the line.

This PR also changes the build chain of the app on Android, Linux and macOS.

• On Linux and macOS, libwg is now distributed as a shared library, which is how wireguard-go currently is built for Android.
• On all of the above platforms, wireguard-go is now a submodule in the app repository. This means that it has to be checkout out in order to build the app on these platforms. This has been detailed in the general build instructions.

This fixes DES-937.

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This change is 

[linear]

DES-937 Make sure `wireguard-go` build correctly on all platforms

[Serock3]

One big concern with making DAITA a feature is that you would not be able to use --all-features (on platforms without DAITA) anymore. The DAITA feature would have to be enabled on Windows and Linux and disabled on other platforms, and it would be up to the developer to know which platforms have the feature, otherwise the app will not build.

It seems that features simply cannot be specified per platform, it is a fundamental limitation of cargo. You cannot specify which features exists or are enabled by default per platform. It is not possible to get around this using build.rs either, as feature resolution is done before the build scripts are run. You can set cfg variables like we do with wireguard_go in talpid-wireguard, but this can't affect which features are enabled in dependencies.

I have thought a lot about how to get around this, but it may be the case that the only proper solution is to simply abandon this PR and keep the raw #[cfg(any(target_os = "windows", target_os = "linux"))] gates, unfortunately.

[hulthe]

Reviewed 64 of 64 files at r1, all commit messages.
Reviewable status: all files reviewed, 5 unresolved discussions (waiting on @MarkusPettersson98)

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mullvad-management-interface/build.rs line 7 at r1 (raw file):

    // Enable Daita by default on Linux and Windows.
    println!("cargo:rustc-check-cfg=cfg(daita)");

should be double :s, i thought it would reject the single-color syntax since check-cfg is a newly added thing 🤔

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mullvad-relay-selector/build.rs line 5 at r1 (raw file):

    // Enable Daita by default on Linux and Windows.
    println!("cargo:rustc-check-cfg=cfg(daita)");

scobido doubleido, etc
maybe do a search replace

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talpid-wireguard/src/lib.rs line 70 at r1 (raw file):

/// TODO: Document
/// TODO: Rename

👁️ 👄 👁️

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wireguard-go-rs/Cargo.lock line 1 at r1 (raw file):

# This file is automatically @generated by Cargo.

wgrs is part of the workspace, this file should be deleted

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wireguard-go-rs/libwg/wireguard-go line 1 at r1 (raw file):

Subproject commit 1e3bc447c174e243df151cf668ba8eab36739ce0

I guess update this after the other PR is merged

[MarkusPettersson98]

Reviewable status: all files reviewed, 5 unresolved discussions (waiting on @hulthe)

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mullvad-management-interface/build.rs line 7 at r1 (raw file):

Previously, hulthe (Joakim Hulthe) wrote…

should be double :s, i thought it would reject the single-color syntax since check-cfg is a newly added thing 🤔

Done. That's a bit weird aye, but good catch!

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mullvad-relay-selector/build.rs line 5 at r1 (raw file):

Previously, hulthe (Joakim Hulthe) wrote…

scobido doubleido, etc
maybe do a search replace

Done.

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talpid-wireguard/src/lib.rs line 70 at r1 (raw file):

Previously, hulthe (Joakim Hulthe) wrote…

👁️ 👄 👁️

Lmao, reverting this

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wireguard-go-rs/Cargo.lock line 1 at r1 (raw file):

Previously, hulthe (Joakim Hulthe) wrote…

wgrs is part of the workspace, this file should be deleted

🤦

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wireguard-go-rs/libwg/wireguard-go line 1 at r1 (raw file):

Previously, hulthe (Joakim Hulthe) wrote…

I guess update this after the other PR is merged

Yup

[Serock3]

Reviewed 15 of 15 files at r7, 2 of 2 files at r8, all commit messages.
Reviewable status: all files reviewed, 6 unresolved discussions (waiting on @hulthe and @MarkusPettersson98)

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ci/buildserver-build.sh line 166 at r7 (raw file):

    git checkout "$ref"
    git submodule update
    git submodule update --init --recursive --depth=1 wireguard-go-rs || true

What does the || true part do? My guess is that it swallows error non-zero exit codes. Would it not be equivalent to add a;?

[Serock3]

Reviewed 20 of 20 files at r9, all commit messages.
Reviewable status: all files reviewed, 6 unresolved discussions (waiting on @hulthe and @MarkusPettersson98)

[Serock3]

Reviewable status: all files reviewed, 7 unresolved discussions (waiting on @hulthe and @MarkusPettersson98)

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talpid-wireguard/src/lib.rs line 825 at r9 (raw file):

    /// Configure and start a Wireguard-go tunnel.
    fn open_wireguard_go_tunnel(

Missing a #[cfg(wireguard_go)] here

[Serock3]

Reviewable status: all files reviewed, 7 unresolved discussions (waiting on @hulthe and @MarkusPettersson98)

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talpid-wireguard/src/lib.rs line 825 at r9 (raw file):

Previously, Serock3 (Sebastian Holmin) wrote…

Missing a #[cfg(wireguard_go)] here

Actually, this belongs to the other PR