Add build-scx-scheds actions

This action can be used to produce sched-ext [1] build artifacts.

[1] https://github.com/sched-ext/scx

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

build-scx-scheds/README.md

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+# Build sched_ext schedulers
+
+This action builds schedulers from https://github.com/sched-ext/scx/
+
+## Required inputs
+
+* `output-dir` - Path to the output directory, where built artifacts will be placed.
+
+## Environment variables
+
+* `LLVM_VERSION` - LLVM (clang) version. Default: `20`.
+* `SCX_ROOT` - Path to the SCX repository. If not set (default), the action will clone the main branch of https://github.com/sched-ext/scx to a temporary directory.

build-scx-scheds/action.yml

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+name: 'Build sched-ext/scx'
+inputs:
+  output-dir:
+    description: 'Path to the output of scx build'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+
+    - name: Install sched-ext/scx dependencies
+      shell: bash
+      run: ${GITHUB_ACTION_PATH}/install-dependencies.sh
+
+    - name: Build sched-ext/scx
+      env:
+        OUTPUT_DIR: ${{ inputs.output-dir }}
+      shell: bash
+      run: ${GITHUB_ACTION_PATH}/build-scheds.sh

build-scx-scheds/build-scheds.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+export LLVM_VERSION=${LLVM_VERSION:-20}
+export SCX_ROOT=${SCX_ROOT:-}
+
+if [[ -z "$SCX_ROOT" ]]; then
+    export SCX_ROOT=$(mktemp -d scx.XXXX)
+    git clone --depth=1 --branch=main https://github.com/sched-ext/scx.git $SCX_ROOT
+fi
+
+pushd $SCX_ROOT
+. $HOME/.cargo/env
+meson setup build
+meson compile -C build
+rm -rf $OUTPUT_DIR
+mv build $OUTPUT_DIR
+popd

build-scx-scheds/install-dependencies.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+export DEBIAN_FRONTEND=noninteractive
+export LLVM_VERSION=${LLVM_VERSION:-20}
+
+# Assume Ubuntu/Debian
+sudo -E apt-get -y update
+
+# Install LLVM
+sudo -E apt-get -y install lsb-release wget software-properties-common gnupg
+wget https://apt.llvm.org/llvm.sh
+chmod +x llvm.sh
+sudo -E ./llvm.sh ${LLVM_VERSION}
+rm llvm.sh
+
+# We have to set up the alternatives because meson expects
+# clang and llvm-strip commands to be available
+sudo update-alternatives --install \
+    /usr/bin/clang clang /usr/bin/clang-${LLVM_VERSION} 10
+sudo update-alternatives --install \
+    /usr/bin/llvm-strip llvm-strip /usr/bin/llvm-strip-${LLVM_VERSION} 10
+
+# Install Rust
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+
+sudo -E apt-get -y install \
+    build-essential libssl-dev libelf-dev meson cmake pkg-config jq \
+    protobuf-compiler libseccomp-dev