Steps to Reproduce

1. Create or trigger a generated mount unit (e.g., mount a filesystem that gets automatically registered with systemd)
2. Run the discovery: systemd.unit.discovery[mount]
3. Observe that generated units are not in the JSON output

Actual Result

Generated units are excluded from discovery results.

Expected Result

Generated units should appear in discovery results with proper UnitFileState information.

Root Cause Analysis

Bug #1: Missing "generated" state in stateNames array

Location: systemd.go, function setUnitStates(), lines 371-394

The stateNames array for UnitFileState does not include "generated":

"UnitFileState",
[]string{
    "enabled",
    "enabled-runtime",
    "linked",
    "linked-runtime",
    "masked",
    "masked-runtime",
    "static",
    "disabled",
    "invalid",
    // "generated" is MISSING!
},

Impact: When setUnitStates() processes a unit with UnitFileState="generated", it maps to state

(unknown state with value 0).

Additional missing states: "static", "linked", "linked-runtime", "enabled-indirect", "transient", "linking" may also not be properly handled.

Bug #2: discovery() does not call setUnitStates()

Location: systemd.go, function discovery(), lines 216-299

The setUnitStates() function is only called in get() (line 189), but NOT in discovery().

Impact: Even if setUnitStates() had the correct states, the discovery function wouldn't use it to convert states to structured format.

Bug #3: Second loop only processes "disabled" units

Location: systemd.go, function discovery(), lines 276-291

The second loop is intended to add disabled unit files that aren't in the runtime list:

if f.EnablementState != "disabled" || (len(ext) != 0 && ext != unitFileExt) ||
    strings.HasSuffix(strings.TrimSuffix(f.Name, unitFileExt), "@") ||
    isEnabledUnit(array, basePath) {
    continue
}

Impact: This loop only adds units with EnablementState="disabled". However, the first loop should be handling all units from ListUnits, so this isn't the primary issue for generated units that ARE in the runtime list.