osbuilder: Remove musl installations

Remove a lot of cruft of musl installations -- we needed those for the
Go agent, but Rustup just takes care of everything. aarch64 on
Debian-based & Alpine is an exception -- create a symlink
`aarch64-linux-musl-gcc` to `musl-tools`'s `musl-gcc` or `gcc` on
Alpine. This is unified -- arch-specific Dockerfiles are removed.

Furthermore, we should keep it in Ubuntu for supporting the offline SEV
KBC. We also keep it in Clear Linux, as that runs our internal checks,
but it is e.g. not shipped in CentOS Stream 9.

Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>

tools/osbuilder/scripts/lib.sh

@@ -7,7 +7,6 @@
 set -e
 
 KATA_REPO=${KATA_REPO:-github.com/kata-containers/kata-containers}
-MUSL_VERSION=${MUSL_VERSION:-"null"}
 # Give preference to variable set by CI
 yq_file="${script_dir}/../../../ci/install_yq.sh"
 kata_versions_file="${script_dir}/../../../versions.yaml"
@@ -228,68 +227,12 @@ generate_dockerfile()
 	dir="$1"
 	[ -d "${dir}" ] || die "${dir}: not a directory"
 
-	local architecture=$(uname -m)
-	local rustarch=${architecture}
-	local muslarch=${architecture}
-	local libc=musl
-	case "$(uname -m)" in
-		"ppc64le")
-			rustarch=powerpc64le
-			muslarch=powerpc64
-			libc=gnu
-			;;
-		"s390x")
-			libc=gnu
-			;;
-
-		*)
-			;;
-	esac
+	local rustarch=$(uname -m)
+	[ "$rustarch" = ppc64le ] && rustarch=powerpc64le
 
 	[ -n "${http_proxy:-}" ] && readonly set_proxy="RUN sed -i '$ a proxy="${http_proxy:-}"' /etc/dnf/dnf.conf /etc/yum.conf; true"
 
 	# Rust agent
-	# rust installer should set path apropiately, just in case
-	# install musl for compiling rust-agent
-	local musl_source_url="https://git.zv.io/toolchains/musl-cross-make.git"
-	local musl_source_dir="musl-cross-make"
-	install_musl=
-	if [ "${muslarch}" == "aarch64" ]; then
-		local musl_tar="${muslarch}-linux-musl-native.tgz"
-		local musl_dir="${muslarch}-linux-musl-native"
-		local aarch64_musl_target="aarch64-linux-musl"
-		install_musl="
-RUN cd /tmp; \
-	mkdir -p /usr/local/musl/; \
-	if curl -sLO --fail https://musl.cc/${musl_tar}; then \
-		tar -zxf ${musl_tar}; \
-		cp -r ${musl_dir}/* /usr/local/musl/; \
-	else \
-		git clone ${musl_source_url}; \
-		TARGET=${aarch64_musl_target} make -j$(nproc) -C ${musl_source_dir} install; \
-		cp -r ${musl_source_dir}/output/* /usr/local/musl/; \
-		cp /usr/local/musl/bin/aarch64-linux-musl-g++ /usr/local/musl/bin/g++; \
-	fi
-ENV PATH=\$PATH:/usr/local/musl/bin
-RUN ln -sf /usr/local/musl/bin/g++ /usr/bin/g++
-"
-	else
-		local musl_tar="musl-${MUSL_VERSION}.tar.gz"
-		local musl_dir="musl-${MUSL_VERSION}"
-		install_musl="
-RUN pushd /root; \
-    curl -sLO https://www.musl-libc.org/releases/${musl_tar}; tar -zxf ${musl_tar}; \
-	cd ${musl_dir}; \
-	sed -i \"s/^ARCH = .*/ARCH = ${muslarch}/g\" dist/config.mak; \
-	./configure > /dev/null 2>\&1; \
-	make > /dev/null 2>\&1; \
-	make install > /dev/null 2>\&1; \
-	echo \"/usr/local/musl/lib\" > /etc/ld-musl-${muslarch}.path; \
-	popd
-ENV PATH=\$PATH:/usr/local/musl/bin
-"
-	fi
-
 	readonly install_rust="
 RUN curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSLf --output /tmp/rust-init; \
     chmod a+x /tmp/rust-init; \
@@ -304,32 +247,13 @@ RUN . /root/.cargo/env; \
 RUN ln -sf /usr/bin/g++ /bin/musl-g++
 "
 	pushd "${dir}"
-	dockerfile_template="Dockerfile.in"
-	dockerfile_arch_template="Dockerfile-${architecture}.in"
-	# if arch-specific docker file exists, swap the univesal one with it.
-        if [ -f "${dockerfile_arch_template}" ]; then
-                dockerfile_template="${dockerfile_arch_template}"
-        else
-                [ -f "${dockerfile_template}" ] || die "${dockerfile_template}: file not found"
-        fi
 
-	# ppc64le and s390x have no musl target
-	if [ "${architecture}" == "ppc64le" ] || [ "${architecture}" == "s390x" ]; then
-		sed \
-			-e "s|@OS_VERSION@|${OS_VERSION:-}|g" \
-			-e "s|@INSTALL_MUSL@||g" \
-			-e "s|@INSTALL_RUST@|${install_rust//$'\n'/\\n}|g" \
-			-e "s|@SET_PROXY@|${set_proxy:-}|g" \
-			"${dockerfile_template}" > Dockerfile
-	else
-		sed \
-			-e "s|@OS_VERSION@|${OS_VERSION:-}|g" \
-			-e "s|@INSTALL_MUSL@|${install_musl//$'\n'/\\n}|g" \
-			-e "s|@INSTALL_RUST@|${install_rust//$'\n'/\\n}|g" \
-			-e "s|@SET_PROXY@|${set_proxy:-}|g" \
-			-e "s|@INSTALL_AA_KBC@|${AA_KBC_EXTRAS//$'\n'/\\n}|g" \
-			"${dockerfile_template}" > Dockerfile
-	fi
+	sed \
+		-e "s#@OS_VERSION@#${OS_VERSION:-}#g" \
+		-e "s#@INSTALL_RUST@#${install_rust//$'\n'/\\n}#g" \
+		-e "s#@SET_PROXY@#${set_proxy:-}#g" \
+		-e "s#@INSTALL_AA_KBC@#${AA_KBC_EXTRAS//$'\n'/\\n}#g" \
+		Dockerfile.in > Dockerfile
 	popd
 }
 
@@ -370,17 +294,6 @@ detect_rust_version()
 	[ -n "$RUST_VERSION" ]
 }
 
-detect_musl_version()
-{
-	info "Detecting musl version"
-    local yq_path="externals.musl.version"
-
-	info "Get musl version from ${kata_versions_file}"
-	MUSL_VERSION="$(get_package_version_from_kata_yaml "$yq_path")"
-
-	[ -n "$MUSL_VERSION" ]
-}
-
 before_starting_container() {
 	return 0
 }