[arm64] Port scripts titled between A-F to support arm64 (#15181)

misc/build.func

@@ -3904,6 +3904,7 @@ build_container() {
   export ENABLE_TUN="$ENABLE_TUN"
   export PCT_OSTYPE="$var_os"
   export PCT_OSVERSION="$var_version"
+  export PCT_ARCH="$(dpkg --print-architecture 2>/dev/null || uname -m)"
   export PCT_DISK_SIZE="$DISK_SIZE"
   export IPV6_METHOD="$IPV6_METHOD"
   export ENABLE_GPU="$ENABLE_GPU"
@@ -5800,9 +5801,37 @@ create_lxc_container() {
     url="https://jenkins.linuxcontainers.org/job/image-${PCT_OSTYPE}/architecture=arm64,release=${CUSTOM_TEMPLATE_VARIANT},variant=default/lastStableBuild/artifact/rootfs.tar.xz"
 
     msg_info "Downloading ${PCT_OSTYPE^} ${CUSTOM_TEMPLATE_VARIANT} ARM64 template"
-    if ! curl -fsSL -o "$dest" "$url"; then
-      msg_error "Failed to download ARM64 template from: $url"
-      exit 208
+    local patched="${dest%/*}/.${dest##*/}.patched"
+    (
+      flock -x 200
+      if [[ -f "$patched" ]] && [[ -s "$dest" ]] && xz -t "$dest" 2>/dev/null; then
+        exit 0
+      fi
+      if ! curl -fsSL -o "$dest" "$url"; then
+        msg_error "Failed to download ARM64 template from: $url"
+        exit 208
+      fi
+      # Some linuxcontainers.org rootfs builds ship without /etc/network,
+      # which makes pve-container's post-create hook fail when it writes the
+      # interfaces file. This appends an empty /etc/network/interfaces if missing.
+      if ! tar -tJf "$dest" 2>/dev/null | grep -q '/etc/network/$'; then
+        fixdir=$(mktemp -d)
+        tmptar="${dest%.xz}"
+        mkdir -p "$fixdir/etc/network"
+        : >"$fixdir/etc/network/interfaces"
+        if xz -d -f "$dest" && tar -C "$fixdir" --append -f "$tmptar" ./etc/network && xz -1 -f "$tmptar"; then
+          rm -rf "$fixdir"
+        else
+          rm -rf "$fixdir" "$tmptar"
+          msg_error "Failed to patch ARM64 template (missing /etc/network)"
+          exit 208
+        fi
+      fi
+      touch "$patched"
+    ) 200>"${dest}.lock"
+    local dl_rc=$?
+    if [[ $dl_rc -ne 0 ]]; then
+      exit "$dl_rc"
     fi
     msg_ok "Downloaded ARM64 LXC template"
   }

misc/core.func

@@ -360,6 +360,27 @@ arch_check() {
   fi
 }
 
+# ------------------------------------------------------------------------------
+# arch_resolve()
+#
+# - Selects an architecture-specific value while preserving amd64 defaults
+# - Usage: arch_resolve "amd64-value" "arm64-value"
+# - Defaults: amd64="amd64", arm64="arm64"
+# ------------------------------------------------------------------------------
+arch_resolve() {
+  local amd64_val="${1:-amd64}"
+  local arm64_val="${2:-arm64}"
+  local arch="${PCT_ARCH:-$(dpkg --print-architecture 2>/dev/null || uname -m)}"
+  case "$arch" in
+  amd64 | x86_64) echo "$amd64_val" ;;
+  arm64 | aarch64) echo "$arm64_val" ;;
+  *)
+    msg_error "Unsupported architecture: $arch"
+    return 106
+    ;;
+  esac
+}
+
 # ------------------------------------------------------------------------------
 # ssh_check()
 #

misc/tools.func

@@ -6920,14 +6920,24 @@ setup_mongodb() {
   export NEEDRESTART_MODE=a
   export NEEDRESTART_SUSPEND=1
 
-  # Check AVX support
-  if ! grep -qm1 'avx[^ ]*' /proc/cpuinfo; then
-    local major="${MONGO_VERSION%%.*}"
-    if ((major > 5)); then
-      msg_error "MongoDB ${MONGO_VERSION} requires AVX support, which is not available on this system."
+  # Check CPU requirements: AVX on x86_64, NEON/ASIMD on arm64
+  case "$(uname -m)" in
+  aarch64)
+    if ! grep -qm1 'asimd' /proc/cpuinfo; then
+      msg_error "MongoDB ${MONGO_VERSION} requires ARMv8.2-A support, which is not available on this system."
       return 236
     fi
-  fi
+    ;;
+  *)
+    if ! grep -qm1 'avx[^ ]*' /proc/cpuinfo; then
+      local major="${MONGO_VERSION%%.*}"
+      if ((major > 5)); then
+        msg_error "MongoDB ${MONGO_VERSION} requires AVX support, which is not available on this system."
+        return 236
+      fi
+    fi
+    ;;
+  esac
 
   case "$DISTRO_ID" in
   ubuntu)