Prevent error message involving CLI arguments in case there's a failure in verifySupported

- This is very confusing because the failure is unrelated to the specified CLI arguments

Signed-off-by: Karl-Philipp Richter <krichter@posteo.de>

scripts/get-helm-3

@@ -25,6 +25,8 @@
 : ${HELM_INSTALL_DIR:="/usr/local/bin"}
 : ${GPG_PUBRING:="pubring.kbx"}
 
+EXIT_VERIFY_FAILED=2
+
 HAS_CURL="$(type "curl" &> /dev/null && echo true || echo false)"
 HAS_WGET="$(type "wget" &> /dev/null && echo true || echo false)"
 HAS_OPENSSL="$(type "openssl" &> /dev/null && echo true || echo false)"
@@ -72,30 +74,30 @@ verifySupported() {
   if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
     echo "No prebuilt binary for ${OS}-${ARCH}."
     echo "To build from source, go to https://github.com/helm/helm"
-    exit 1
+    exit $EXIT_VERIFY_FAILED
   fi
 
   if [ "${HAS_CURL}" != "true" ] && [ "${HAS_WGET}" != "true" ]; then
     echo "Either curl or wget is required"
-    exit 1
+    exit $EXIT_VERIFY_FAILED
   fi
 
   if [ "${VERIFY_CHECKSUM}" == "true" ] && [ "${HAS_OPENSSL}" != "true" ]; then
     echo "In order to verify checksum, openssl must first be installed."
     echo "Please install openssl or set VERIFY_CHECKSUM=false in your environment."
-    exit 1
+    exit $EXIT_VERIFY_FAILED
   fi
 
   if [ "${VERIFY_SIGNATURES}" == "true" ]; then
     if [ "${HAS_GPG}" != "true" ]; then
       echo "In order to verify signatures, gpg must first be installed."
       echo "Please install gpg or set VERIFY_SIGNATURES=false in your environment."
-      exit 1
+      exit $EXIT_VERIFY_FAILED
     fi
     if [ "${OS}" != "linux" ]; then
       echo "Signature verification is currently only supported on Linux."
       echo "Please set VERIFY_SIGNATURES=false or verify the signatures manually."
-      exit 1
+      exit $EXIT_VERIFY_FAILED
     fi
   fi
 
@@ -246,7 +248,9 @@ verifySignatures() {
 fail_trap() {
   result=$?
   if [ "$result" != "0" ]; then
-    if [[ -n "$INPUT_ARGUMENTS" ]]; then
+    if [[ "$result" = "$EXIT_VERIFY_FAILED" ]]; then
+      echo "The script failed the installation parameter validation"
+    elif [[ -n "$INPUT_ARGUMENTS" ]]; then
       echo "Failed to install $BINARY_NAME with the arguments provided: $INPUT_ARGUMENTS"
       help
     else