Passing URL as environment variable

Signed-off-by: Lukas Bednar <lbednar@redhat.com>

README.rst

@@ -198,11 +198,11 @@ Usage
      # connection_error_strategy [strict|skip|ignore] Choose how to handle connection errors
      # return_jira_metadata = False (return Jira issue with metadata instead of boolean result)
 
-   You can set the password and username fields by setting the PYTEST_JIRA_PASSWORD, PYTEST_JIRA_USERNAME and
-   PYTEST_JIRA_TOKEN environment variables:
+   Alternatively, you can set the url, password, username and token fields using relevant environment variables:
 
     .. code:: sh
 
+      export PYTEST_JIRA_URL="https://..."
       export PYTEST_JIRA_PASSWORD="FOO"
       export PYTEST_JIRA_USERNAME="BAR"
       export PYTEST_JIRA_TOKEN="TOKEN"

pytest_jira.py

@@ -29,6 +29,7 @@
 SKIP = 'skip'
 IGNORE = 'ignore'
 PLUGIN_NAME = "jira_plugin"
+URL_ENV_VAR = 'PYTEST_JIRA_URL'
 PASSWORD_ENV_VAR = 'PYTEST_JIRA_PASSWORD'
 USERNAME_ENV_VAR = 'PYTEST_JIRA_USERNAME'
 TOKEN_ENV_VAR = 'PYTEST_JIRA_TOKEN'
@@ -544,9 +545,11 @@ def pytest_configure(config):
     if not resolved_resolutions:
         resolved_resolutions = []
 
-    if config.getvalue('jira') and config.getvalue('jira_url'):
+    if config.getvalue('jira') and (
+        os.getenv(URL_ENV_VAR) or config.getvalue('jira_url')
+    ):
         jira_connection = JiraSiteConnection(
-            config.getvalue('jira_url'),
+            os.getenv(URL_ENV_VAR) or config.getvalue('jira_url'),
             os.getenv(USERNAME_ENV_VAR) or config.getvalue('jira_username'),
             os.getenv(PASSWORD_ENV_VAR) or config.getvalue('jira_password'),
             config.getvalue('jira_verify'),