Switch to C-based mini init process

Signed-off-by: Cong Wang <cwang@multikernel.io>

Author: congwang-mk

.github/workflows/lint_and_test.yml

@@ -26,6 +26,15 @@ jobs:
         virtualenvs-path: .venv
         installer-parallel: true
 
+    - name: Install musl-tools
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y musl-tools
+
+    - name: Build init binary
+      run: |
+        make
+
     - name: Install dependencies
       run: |
         poetry install --no-interaction

.gitignore

@@ -1 +1,5 @@
 __pycache__/
+
+# Built artifacts
+src/init/kerf-init
+src/kerf/data/kerf-init

Makefile

@@ -0,0 +1,15 @@
+# Top-level Makefile for kerf
+# Builds the C init binary and copies it to package data
+
+all: init
+
+init:
+	$(MAKE) -C src/init
+	mkdir -p src/kerf/data
+	cp src/init/kerf-init src/kerf/data/
+
+clean:
+	$(MAKE) -C src/init clean
+	rm -f src/kerf/data/kerf-init
+
+.PHONY: all init clean

pyproject.toml

@@ -9,6 +9,9 @@ description = "Multikernel Management CLI tool"
 authors = ["Cong Wang"]
 readme = "README.md"
 packages = [{include = "kerf", from = "src"}]
+include = [
+    { path = "src/kerf/data/kerf-init", format = ["sdist", "wheel"] },
+]
 
 [tool.poetry.dependencies]
 python = "^3.9"

src/init/Makefile

@@ -0,0 +1,16 @@
+# Makefile for kerf-init
+# Builds a statically-linked init binary using musl-gcc
+
+CC = musl-gcc
+CFLAGS = -Wall -Wextra -Werror -O2 -static
+TARGET = kerf-init
+
+all: $(TARGET)
+
+$(TARGET): init.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+clean:
+	rm -f $(TARGET)
+
+.PHONY: all clean