stages/systemd.unit.create: Environment and EnvironmentFile

Support the Environment and EnvironmentFile options in the Service
section of the unit file.
The Environment option is set as an object with keys "key" and "value"
and the key is validated with a pattern.

Updated the stage to special-case the Environment option.

stages/org.osbuild.systemd.unit.create

@@ -23,6 +23,9 @@ def main(tree, options):
         for option, value in opts.items():
             if isinstance(value, list):
                 for v in value:
+                    if option == "Environment":
+                        # Option value becomes "KEY=VALUE" (quoted)
+                        v = '"' + v["key"] + "=" + str(v["value"]) + '"'
                     config.set(section, str(option) + "=" + str(v))
             else:
                 config.set(section, option, str(value))

stages/org.osbuild.systemd.unit.create.meta.json

@@ -24,6 +24,8 @@
     "    - 'ExecStartPre' - [string]",
     "    - 'ExecStopPost' - [string]",
     "    - 'ExecStart' - [string]",
+    "    - 'Environment' - [object]",
+    "    - 'EnvironmentFile' - [string]",
     "  - 'Install' section",
     "    - 'WantedBy' - [string]",
     "    - 'RequiredBy' - [string]"
@@ -142,6 +144,31 @@
                 "items": {
                   "type": "string"
                 }
+              },
+              "Environment": {
+                "type": "array",
+                "description": "Sets environment variables for executed process.",
+                "items": {
+                  "type": "object",
+                  "description": "Sets environment variables for executed process.",
+                  "additionalProperties": false,
+                  "properties": {
+                    "key": {
+                      "type": "string",
+                      "pattern": "^[A-Za-z_][A-Za-z0-9_]*"
+                    },
+                    "value": {
+                      "type": "string"
+                    }
+                  }
+                }
+              },
+              "EnvironmentFile": {
+                "type": "array",
+                "description": "Path to file that contains environment variables to set for the process.",
+                "items": {
+                  "type": "string"
+                }
               }
             }
           },