build: fail if no virtual packages are created

Signed-off-by: Reuben Miller <reuben.d.miller@gmail.com>

Author: reubenmiller

ci/build_scripts/package.sh

@@ -194,6 +194,14 @@ build_virtual_package() {
     if [[ "$PACKAGE_TYPES" =~ apk ]]; then
         env GIT_SEMVER="${APK_VERSION:-$GIT_SEMVER}" RELEASE="r0" nfpm "${COMMON_ARGS[@]}" --packager apk
     fi
+
+    # Expect to build at least 1 virtual package to prevent silent errors
+    # when no virtual packages were created
+    VIRTUAL_PACKAGE_COUNT=$(find target/virtual-packages -type f | wc -l | xargs)
+    if [ "$VIRTUAL_PACKAGE_COUNT" -lt 1 ]; then
+        echo "Expected at least 1 virtual packages to have been created. got=$VIRTUAL_PACKAGE_COUNT" >&2
+        exit 1
+    fi
 }
 
 get_package_arch() {