optee_rust_examples_ext: Fix Rust toolchain conflicts

[b49020]

Buildroot provides its own Rust toolchain for various Linux user-space components. However, that toolchain doesn't support nightly version of Rust complier which we need for OP-TEE Rust examples for the time being.

Due to two separate Rust toolchains being used for different buildroot components, there are conflicts [1] [2] observed leading to CI errors. In order to fix them enable OP-TEE specific Rust toolchain specifically to build OP-TEE Rust examples rather than enabling it for the entire buildroot build.

Fixes: [1] https://github.com/OP-TEE/build/issues/727 Fixes: [2] https://github.com/OP-TEE/build/issues/728

@DemesneGH fyi..

[b49020]

Tag applied, thanks.

[jforissier]

2024-02-06T08:57:39.9105465Z make[5]: cargo: No such file or directory

ci_log.txt

https://github.com/jforissier/optee_os/actions/runs/7796709151/job/21261880050

Tested by applying this patch to ci.yml: https://github.com/jforissier/optee_os/commit/99e65f6d7d16620568f13cfc14989ec1602a590e and pushing to my forked optee_os so that CI is run.

[b49020]

@jforissier Thanks for testing. Its embarrassing to see how my local environment tricked me to not catch errors in the first place. BTW, the CI error should be fixed now with the Rust toolchain dependency resolved for Rust examples. Can you please give it a retry?

[jforissier]

Thanks for the update. Still not working (cargo: No such file or directory). I suggest you try running in the Docker image that the CI uses

docker run -it --rm jforissier/optee_os_ci:qemuv8_check2
# cd
# vi get_optee_qemuv8.sh
(Add "git fetch github pull/731/merge && git checkout FETCH_HEAD" before the "make toolchains" line)
# ./get_optee_qemuv8.sh
# cd optee_repo_qemu_v8/build
# make -j$(nproc) buildroot

[b49020]

Still not working (cargo: No such file or directory). I suggest you try running in the Docker image that the CI uses

Sure, that make sense. I will give it a try.

[b49020]

While digging further the buildroot provided Rust toolchain actually doesn't support nightly version of Rust compiler. So we have to live with OP-TEE specific Rust nightly toolchain for the time being.

Now with this updated PR, it is yet another attempt to fix Rust toolchain conflicts. @jenswi-linaro I dropped your ack since its I switched to a different approach fixing CI problems.

@jforissier Docker image seems to pass for me, can you give this PR a try through CI?

[b49020]

BTW, the IBART error seems unrelated to this PR. @jbech-linaro please have a look.

[jforissier]

I tried building twice and it failed twice with messages similar to:

error: component download failed for rust-std-aarch64-unknown-linux-gnu: could not rename downloaded file from '/root/.rustup/downloads/6847b6e5e7c628c3d934dbdac2adeb0098364b543159bb158fa5d0aa7b3d1509.partial' to '/root/.rustup/downloads/6847b6e5e7c628c3d934dbdac2adeb0098364b543159bb158fa5d0aa7b3d1509'

Log file here: build.log.zip

It looks like something is happening in parallel which should not.

I am building on a 128-vCPU EC2 host with the following commands:

docker run -it --rm jforissier/optee_os_ci:qemuv8_check2
vi /root/get_optee_qemuv8.sh
# Before the "make toolchains" line, add:
git fetch github pull/731/merge && git checkout FETCH_HEAD
# Then run:
yes "" | /root/get_optee_qemuv8.sh && make -j$(nproc) -C /root/optee_repo_qemu_v8/build buildroot 2>&1 | tee build.log

I can give you access temporarily if you wish. Just give me your SSH key (~/.ssh/id_rsa.pub or similar) and I will give you the current DNS name of the VM.

[b49020]

@jforissier Thanks for providing your build machine access to me. It turned out to be following fix in order to get the build to pass:

diff --git a/br-ext/package/optee_rust_examples_ext/optee_rust_examples_ext.mk b/br-ext/package/optee_rust_examples_ext/optee_rust_examples_ext.mk
index 64b2a5f..0b538b3 100644
--- a/br-ext/package/optee_rust_examples_ext/optee_rust_examples_ext.mk
+++ b/br-ext/package/optee_rust_examples_ext/optee_rust_examples_ext.mk
@@ -10,7 +10,7 @@ EXAMPLE = $(wildcard examples/*)

 define OPTEE_RUST_EXAMPLES_EXT_BUILD_CMDS
        echo Building OP-TEE rust examples && \
-       source $(BR2_PACKAGE_OPTEE_RUST_EXAMPLES_EXT_TC_PATH)/.cargo/env && \
+       source $(subst $\",,$(BR2_PACKAGE_OPTEE_RUST_EXAMPLES_EXT_TC_PATH))/.cargo/env && \
        TARGET_HOST=$(BR2_PACKAGE_OPTEE_RUST_EXAMPLES_EXT_TARGET_HOST) \
        TARGET_TA=$(BR2_PACKAGE_OPTEE_RUST_EXAMPLES_EXT_TARGET_TA) \
        CROSS_COMPILE_HOST=$(BR2_PACKAGE_OPTEE_RUST_EXAMPLES_EXT_CROSS_COMPILE_HOST) \

The PR has been updated, hopefully it should pass the CI now.

[jforissier]

Still those "could not rename" errors...

[b49020]

Further digging led me to discover that externally installed OP-TEE specific toolchain can't be discovered within the buildroot environment. This was leading to Rust toolchain installation while building Rust examples which doesn't support parallelism. Given that I instead switched Rust toolchain installation to configure stage for Rust examples. With that I no longer observe any "could not rename" errors. Feel free to give it a retry.

[jforissier]

Tested-by: Jerome Forissier <jerome.forissier@linaro.org>

@b49020 many thanks for spending time on this nasty bug :wink: it will be good to have Rust checked in all the QEMUv8 CI jobs!

[b49020]

Thanks @jforissier for your support with testing, tag applied.

[b49020]

Added proper comments, tag applied.