Fail if key is empty (#39)

* Added fail case, added tests

* Fixed empty key error message

.github/workflows/test.yml

@@ -136,3 +136,37 @@ jobs:
         then
             echo "ERR"
         fi
+
+  should-fail-test-absolute-path:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Create folder
+      run: |
+        mkdir -p subdir
+
+    - name: Make envfile
+      uses: ./
+      with:
+        envkey_DEBUG: false
+        directory: /home
+
+
+  should-fail-test-bad-secret:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Create folder
+      run: |
+        mkdir -p subdir
+
+    - name: Make envfile
+      uses: ./
+      with:
+        envkey_SECRET_KEY: ${{ secrets.NON_EXISTENT_SECRET }}

src/create-envfile.py

@@ -8,7 +8,13 @@
 # Make sure the env keys are sorted to have reproducible output
 for key in sorted(env_keys):
     if key.startswith("INPUT_ENVKEY_"):
-        out_file += "{}={}\n".format(key.split("INPUT_ENVKEY_")[1], os.getenv(key))
+        value = os.getenv(key, "")
+
+        # If the key is empty, throw an error.
+        if value == "":
+            raise Exception(f"Empty env key found: {key}")
+
+        out_file += "{}={}\n".format(key.split("INPUT_ENVKEY_")[1], value)
 
 # get directory name in which we want to create .env file
 directory = str(os.getenv("INPUT_DIRECTORY", ""))