musl: ci: add build test and unit tests

.github/workflows/build-test-musl.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+set -eux
+
+if ! command -v musl-gcc >/dev/null; then
+    echo "musl-gcc is not installed, skipping the test."
+    exit 77
+fi
+
+TMPDIR=$(mktemp -d)
+
+cleanup() (
+    set +e
+
+    if [[ -d "$TMPDIR" ]]; then
+        rm -rf "$TMPDIR"
+    fi
+)
+
+trap cleanup EXIT ERR INT TERM
+
+mkdir -p "${TMPDIR}/build"
+mkdir -p "${TMPDIR}/usr/include"
+mkdir -p "${TMPDIR}/usr/lib64/pkgconfig"
+
+CFLAGS="-idirafter ${TMPDIR}/usr/include"
+export PKG_CONFIG_PATH="${TMPDIR}"/usr/lib64/pkgconfig
+
+LINKS=(
+    acl
+    archive.h
+    archive_entry.h
+    asm
+    asm-generic
+    audit-records.h
+    audit_logging.h
+    bpf
+    bzlib.h
+    curl
+    dwarf.h
+    elfutils
+    fido.h
+    gcrypt.h
+    gelf.h
+    gnutls
+    gpg-error.h
+    idn2.h
+    libaudit.h
+    libcryptsetup.h
+    libelf.h
+    libkmod.h
+    linux
+    lz4.h
+    lz4frame.h
+    lz4hc.h
+    lzma
+    lzma.h
+    microhttpd.h
+    mtd
+    openssl
+    pcre2.h
+    pwquality.h
+    qrencode.h
+    seccomp-syscalls.h
+    seccomp.h
+    security
+    selinux
+    sys/acl.h
+    sys/capability.h
+    tss2
+    xen
+    xkbcommon
+    zconf.h
+    zlib.h
+    zstd.h
+    zstd_errors.h
+)
+
+for t in "${LINKS[@]}"; do
+    [[ -e /usr/include/"$t" ]]
+    link="${TMPDIR}"/usr/include/"${t}"
+    mkdir -p "${link%/*}"
+    ln -s /usr/include/"$t" "$link"
+done
+
+env \
+    CC=musl-gcc \
+    CXX=musl-gcc \
+    CFLAGS="$CFLAGS" \
+    CXXFLAGS="$CFLAGS" \
+    meson setup --werror -Ddbus-interfaces-dir=no -Dlibc=musl "${TMPDIR}"/build
+
+ninja -v -C "${TMPDIR}"/build

.github/workflows/linter.yml

@@ -49,6 +49,10 @@ jobs:
           [Build]
           ToolsTreeDistribution=fedora
           ToolsTreeRelease=rawhide
+          ToolsTreePackages=
+                libgcrypt-devel
+                libgpg-error-devel
+                musl-gcc
           EOF
 
           mkosi -f box -- true
@@ -77,3 +81,6 @@ jobs:
 
       - name: Run clang-tidy
         run: mkosi box -- meson test -C build --suite=clang-tidy --print-errorlogs --no-stdsplit
+
+      - name: Build with musl
+        run: mkosi box -- .github/workflows/build-test-musl.sh

.github/workflows/unit-tests-musl.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# shellcheck disable=SC2206
+PHASES=(${@:-SETUP BUILD RUN CLEANUP})
+
+function info() {
+    echo -e "\033[33;1m$1\033[0m"
+}
+
+function run_meson() {
+    if ! meson "$@"; then
+        find . -type f -name meson-log.txt -exec cat '{}' +
+        return 1
+    fi
+}
+
+set -ex
+
+for phase in "${PHASES[@]}"; do
+    case $phase in
+        SETUP)
+            info "Setup phase"
+
+            # Alpine still uses split-usr.
+            for i in /bin/* /sbin/*; do
+                ln -rs "$i" "/usr/$i";
+            done
+            ;;
+        BUILD)
+            info "Build systemd phase"
+
+            run_meson setup --werror -Dtests=unsafe -Dslow-tests=true -Dfuzz-tests=true -Dlibc=musl build
+            ninja -v -C build
+            ;;
+        RUN)
+            info "Run phase"
+
+            # Create dummy machine ID.
+            echo '052e58f661f94bd080e258b96aea3f7b' > /etc/machine-id
+
+            # Start dbus for several unit tests.
+            mkdir -p /var/run/dbus
+            /usr/bin/dbus-daemon --system || :
+
+            # Here, we explicitly set SYSTEMD_IN_CHROOT=yes as unfortunately runnin_in_chroot() does not
+            # correctly detect the environment.
+            env \
+                SYSTEMD_IN_CHROOT=yes \
+                meson test -C build --print-errorlogs
+            ;;
+        CLEANUP)
+            info "Cleanup phase"
+            ;;
+        *)
+            echo >&2 "Unknown phase '$phase'"
+            exit 1
+    esac
+done

.github/workflows/unit-tests-musl.yml

@@ -0,0 +1,113 @@
+---
+# vi: ts=2 sw=2 et:
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+name: Unit tests (musl)
+on:
+  pull_request:
+    paths:
+      - '**/meson.build'
+      - '.github/workflows/**'
+      - 'meson_options.txt'
+      - 'src/**'
+      - 'test/fuzz/**'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Repository checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+
+      - name: Install build dependencies
+        uses: jirutka/setup-alpine@v1
+        with:
+          arch: x86_64
+          branch: edge
+          packages: >
+            acl
+            acl-dev
+            audit-dev
+            bash
+            bash-completion-dev
+            bpftool
+            build-base
+            bzip2-dev
+            coreutils
+            cryptsetup-dev
+            curl-dev
+            dbus
+            dbus-dev
+            elfutils-dev
+            gettext-dev
+            git
+            glib-dev
+            gnutls-dev
+            gperf
+            grep
+            iproute2
+            iptables-dev
+            kbd
+            kexec-tools
+            kmod
+            kmod-dev
+            libapparmor-dev
+            libarchive-dev
+            libbpf-dev
+            libcap-dev
+            libcap-utils
+            libfido2-dev
+            libgcrypt-dev
+            libidn2-dev
+            libmicrohttpd-dev
+            libpwquality-dev
+            libqrencode-dev
+            libseccomp-dev
+            libselinux-dev
+            libxkbcommon-dev
+            linux-pam-dev
+            lz4-dev
+            meson
+            openssl
+            openssl-dev
+            p11-kit-dev
+            pcre2-dev
+            pkgconf
+            polkit-dev
+            py3-elftools
+            py3-jinja2
+            py3-pefile
+            py3-pytest
+            py3-lxml
+            quota-tools
+            rsync
+            sfdisk
+            tpm2-tss-dev
+            tpm2-tss-esys
+            tpm2-tss-rc
+            tpm2-tss-tcti-device
+            tzdata
+            util-linux-dev
+            util-linux-login
+            util-linux-misc
+            utmps-dev
+            valgrind-dev
+            xen-dev
+            zlib-dev
+            zstd-dev
+
+      - name: Setup
+        run: .github/workflows/unit-tests-musl.sh SETUP
+        shell: alpine.sh --root {0}
+      - name: Build
+        run: .github/workflows/unit-tests-musl.sh BUILD
+        shell: alpine.sh {0}
+      - name: Run
+        run: .github/workflows/unit-tests-musl.sh RUN
+        shell: alpine.sh --root {0}
+      - name: Cleanup
+        run: .github/workflows/unit-tests-musl.sh CLEANUP
+        shell: alpine.sh --root {0}