service: do not show pebble as an option on unsupported architectures

cmd/ipfs-cluster-service/main.go

@@ -37,7 +37,6 @@ const programName = "ipfs-cluster-service"
 const (
 	defaultLogLevel  = "info"
 	defaultConsensus = "crdt"
-	defaultDatastore = "badger"
 )
 
 const (
@@ -274,7 +273,7 @@ the peer IDs in the given multiaddresses.
 				},
 				cli.StringFlag{
 					Name:  "datastore",
-					Usage: "select datastore: 'badger', 'badger3', 'leveldb', 'pebble'",
+					Usage: datastoreFlagUsage,
 					Value: defaultDatastore,
 				},
 				cli.BoolFlag{

cmd/ipfs-cluster-service/pebble_disabled.go

@@ -0,0 +1,8 @@
+//go:build arm || 386 || (openbsd && amd64)
+
+package main
+
+const (
+	defaultDatastore   = "badger"
+	datastoreFlagUsage = "select datastore: 'badger', 'badger3' or 'leveldb'"
+)

cmd/ipfs-cluster-service/pebble_enabled.go

@@ -0,0 +1,8 @@
+//go:build !arm && !386 && !(openbsd && amd64)
+
+package main
+
+const (
+	defaultDatastore   = "badger"
+	datastoreFlagUsage = "select datastore: 'badger', 'badger3', 'leveldb' or 'pebble'"
+)

datastore/pebble/pebble_disabled.go

@@ -51,7 +51,7 @@ func (cfg *Config) LoadJSON(raw []byte) error {
 // ToJSON generates a JSON-formatted human-friendly representation of this
 // Config.
 func (cfg *Config) ToJSON() (raw []byte, err error) {
-	return []byte("{}"), nil
+	return []byte("{}"), ErrUnsupported
 }
 
 // GetFolder returns the Pebble folder.