virtiofsd: build rust based virtiofsd from source for non-x86_64

Based on @fidencio's opoinon,
On Arm: static build virtiofsd using musl lib;
on ppc64 & s390: static build virtiofsd using gnu lib;

Fixes: #4258
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>

tools/packaging/static-build/virtiofsd/build-static-virtiofsd.sh

@@ -9,6 +9,8 @@ set -o nounset
 set -o pipefail
 
 ARCH=$(uname -m)
+ARCH_LIBC=""
+LIBC=""
 
 script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
@@ -19,11 +21,12 @@ virtiofsd_version="${virtiofsd_version:-}"
 [ -n "$virtiofsd_version" ] || virtiofsd_version=$(get_from_kata_deps "externals.virtiofsd.version")
 [ -n "$virtiofsd_version" ] || die "failed to get virtiofsd version"
 
-if [ "${ARCH}" != "x86_64" ]; then
-	info "Only x86_64 binaries are distributed as part of the virtiofsd releases" && exit 1
-fi
+[ -d "virtiofsd" ] && rm -r virtiofsd
 
 pull_virtiofsd_released_binary() {
+    if [ "${ARCH}" != "x86_64" ]; then
+	info "Only x86_64 binaries are distributed as part of the virtiofsd releases" && return 1
+    fi
     info "Download virtiofsd version: ${virtiofsd_version}"
     virtiofsd_zip=$(get_from_kata_deps "externals.virtiofsd.meta.binary")
     [ -n "${virtiofsd_zip}" ] || die "failed to get virtiofsd binary URL"
@@ -40,4 +43,47 @@ pull_virtiofsd_released_binary() {
     popd
 }
 
-pull_virtiofsd_released_binary
+init_env() {
+   case ${ARCH} in
+     "aarch64")
+       LIBC="musl"
+     ;;
+     "ppc64le")
+       LIBC="gnu"
+       ARCH="powerpc64le"
+     ;;
+     "s390")
+       LIBC="gnu"
+     ;;
+     "x86_64")
+       LIBC="musl"
+  esac
+
+    ARCH_LIBC=${ARCH}-linux-${LIBC}
+}
+	   
+build_virtiofsd_from_source() {
+   echo "build viriofsd from source"
+   init_env
+
+   virtiofsd_url=$(get_from_kata_deps "externals.virtiofsd.url")
+
+   git clone --depth 1 --branch ${virtiofsd_version} ${virtiofsd_url} virtiofsd
+   pushd virtiofsd
+
+   RUSTFLAGS='-C target-feature=+crt-static -C link-self-contained=yes'
+   LIBSECCOMP_LINK_TYPE=static
+   LIBSECCOMP_LIB_PATH=/usr/lib/${ARCH_LIBC}
+   LIBCAPNG_LINK_TYPE=static
+   LIBCAPNG_LIB_PATH=/usr/lib/${ARCH_LIBC}
+   
+   cargo build --release --target ${ARCH}-unknown-linux-${LIBC}
+
+   binary=$(find ./ -name virtiofsd)
+   mv -f ${binary} .
+   chmod +x virtiofsd
+
+   popd
+}
+
+pull_virtiofsd_released_binary || build_virtiofsd_from_source