Revert "Update kube::util::ensure-cfssl"

hack/lib/util.sh

@@ -707,15 +707,50 @@ function kube::util::join {
 #  CFSSLJSON_BIN: The path of the installed cfssljson binary
 #
 function kube::util::ensure-cfssl {
-  echo "Installing cfssl from vendor"
-  GOBIN="${KUBE_OUTPUT_BINPATH:-}" go install k8s.io/kubernetes/vendor/github.com/cloudflare/cfssl/cmd/cfssl
-  GOBIN="${KUBE_OUTPUT_BINPATH:-}" go install k8s.io/kubernetes/vendor/github.com/cloudflare/cfssl/cmd/cfssljson
-  CFSSL_BIN="$(PATH="${KUBE_OUTPUT_BINPATH:-}:${PATH}" command -v cfssl)"
-  CFSSLJSON_BIN="$(PATH="${KUBE_OUTPUT_BINPATH:-}:${PATH}" command -v cfssljson)"
-  if [[ ! -x ${CFSSL_BIN} || ! -x ${CFSSLJSON_BIN} ]]; then
-    echo "Failed to install cfssl." >&2
-    exit 1
+  if command -v cfssl &>/dev/null && command -v cfssljson &>/dev/null; then
+    CFSSL_BIN=$(command -v cfssl)
+    CFSSLJSON_BIN=$(command -v cfssljson)
+    return 0
+  fi
+
+  # Create a temp dir for cfssl if no directory was given
+  local cfssldir=${1:-}
+  if [[ -z "${cfssldir}" ]]; then
+    kube::util::ensure-temp-dir
+    cfssldir="${KUBE_TEMP}/cfssl"
   fi
+
+  mkdir -p "${cfssldir}"
+  pushd "${cfssldir}" > /dev/null
+
+    echo "Unable to successfully run 'cfssl' from $PATH; downloading instead..."
+    kernel=$(uname -s)
+    case "${kernel}" in
+      Linux)
+        curl --retry 10 -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
+        curl --retry 10 -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
+        ;;
+      Darwin)
+        curl --retry 10 -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_darwin-amd64
+        curl --retry 10 -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_darwin-amd64
+        ;;
+      *)
+        echo "Unknown, unsupported platform: ${kernel}." >&2
+        echo "Supported platforms: Linux, Darwin." >&2
+        exit 2
+    esac
+
+    chmod +x cfssl || true
+    chmod +x cfssljson || true
+
+    CFSSL_BIN="${cfssldir}/cfssl"
+    CFSSLJSON_BIN="${cfssldir}/cfssljson"
+    if [[ ! -x ${CFSSL_BIN} || ! -x ${CFSSLJSON_BIN} ]]; then
+      echo "Failed to download 'cfssl'. Please install cfssl and cfssljson and verify they are in \$PATH."
+      echo "Hint: export PATH=\$PATH:\$GOPATH/bin; go get -u github.com/cloudflare/cfssl/cmd/..."
+      exit 1
+    fi
+  popd > /dev/null
 }
 
 # kube::util::ensure_dockerized