Add checks so I can't mess that up again

Author: jack-fortanix

ct.sh

@@ -4,6 +4,11 @@ cd "$(dirname "$0")"
 
 cd "./mbedtls"
 
+if [ -z $TRAVIS_RUST_VERSION ]; then
+    echo "Expected TRAVIS_RUST_VERSION to be set in env"
+    exit 1
+fi
+
 if [ $TRAVIS_RUST_VERSION = "stable" ] || [ $TRAVIS_RUST_VERSION = "beta" ] || [ $TRAVIS_RUST_VERSION = "nightly" ]; then
     rustup default $TRAVIS_RUST_VERSION
     cargo test
@@ -22,4 +27,7 @@ elif [ $TRAVIS_RUST_VERSION = $SGX_NIGHTLY ]; then
     rustup target add --toolchain $SGX_NIGHTLY x86_64-fortanix-unknown-sgx
     cargo +$SGX_NIGHTLY test --no-run --target=x86_64-fortanix-unknown-sgx --features=sgx --no-default-features
 
+else
+    echo "Unknown version $TRAVIS_RUST_VERSION"
+    exit 1
 fi