stages/systemd:support for user service dropin

systemd unit stage will now be able to add user unit dropin,
this is done by adding an additional field:unit-type
which is set to system by default. It also adds ability
to update the unit config with ConditionPathExists.
Relevant testing updated for the new workflow.

Signed-off-by: Sayan Paul <paul.sayan@gmail.com>

stages/org.osbuild.systemd.unit

@@ -39,6 +39,17 @@ SCHEMA = r"""
     "type": "object",
     "description": "Drop-in configuration for a '.service' unit.",
     "properties": {
+      "Unit": {
+        "additionalProperties": false,
+        "type": "object",
+        "description": "'Unit' configuration section of a unit file.",
+        "properties": {
+          "ConditionPathExists": {
+            "type": "string",
+            "description": "Check for the existence of a file. If the specified absolute path name does not exist, the condition will fail."
+          }
+        }
+      },
       "Service": {
         "additionalProperties": false,
         "type": "object",
@@ -51,6 +62,12 @@ SCHEMA = r"""
         }
       }
     }
+  },
+  "unit-type": {
+    "type": "string",
+    "enum": ["system", "global"],
+    "default": "system",
+    "description": "Selects between systemd system or global unit to add dropin"
   }
 }
 """
@@ -60,12 +77,16 @@ def main(tree, options):
     unit = options["unit"]
     dropin_file = options["dropin"]
     cfg = options["config"]
+    unit_type = options.get("unit-type", "system")
 
     # ensure the unit name + ".d" does not exceed maximum filename length
     if len(unit + ".d") > 255:
         raise ValueError(f"Error: the {unit} unit drop-in directory exceeds the maximum filename length.")
 
-    unit_dropins_dir = f"{tree}/usr/lib/systemd/system/{unit}.d"
+    if unit_type == "system":
+        unit_dropins_dir = f"{tree}/usr/lib/systemd/system/{unit}.d"
+    elif unit_type == "global":
+        unit_dropins_dir = f"{tree}/usr/lib/systemd/user/{unit}.d"
     os.makedirs(unit_dropins_dir, exist_ok=True)
 
     config = configparser.ConfigParser()

test/data/stages/systemd.unit/b.json

@@ -470,6 +470,19 @@
             }
           }
         }
+      },
+      {
+        "name": "org.osbuild.systemd.unit",
+        "options": {
+          "unit": "grub-boot-success.timer",
+          "dropin": "10-disable-if-greenboot.conf",
+          "unit-type": "global",
+          "config": {
+            "Unit": {
+              "ConditionPathExists": "/usr/lib/greenboot/greenboot"
+            }
+          }
+        }
       }
     ]
   },

test/data/stages/systemd.unit/b.mpp.yaml

@@ -26,3 +26,11 @@ pipeline:
         config:
           Service:
             Environment: NM_CLOUD_SETUP_EC2=yes
+    - name: org.osbuild.systemd.unit
+      options:
+        unit: grub-boot-success.timer
+        dropin: 10-disable-if-greenboot.conf
+        unit-type: global
+        config:
+          Unit:
+            ConditionPathExists: /usr/lib/greenboot/greenboot

test/data/stages/systemd.unit/diff.json

@@ -1,7 +1,9 @@
 {
   "added_files": [
     "/usr/lib/systemd/system/nm-cloud-setup.service.d",
-    "/usr/lib/systemd/system/nm-cloud-setup.service.d/10-rh-enable-for-ec2.conf"
+    "/usr/lib/systemd/system/nm-cloud-setup.service.d/10-rh-enable-for-ec2.conf",
+    "/usr/lib/systemd/user/grub-boot-success.timer.d",
+    "/usr/lib/systemd/user/grub-boot-success.timer.d/10-disable-if-greenboot.conf"
   ],
   "deleted_files": [],
   "differences": {}