Add build constraints to support non-linux systems

filebeat/input/systemlogs/input.go

@@ -24,7 +24,6 @@ import (
 
 	"github.com/elastic/beats/v7/filebeat/channel"
 	v1 "github.com/elastic/beats/v7/filebeat/input"
-	"github.com/elastic/beats/v7/filebeat/input/journald"
 	loginput "github.com/elastic/beats/v7/filebeat/input/log"
 	v2 "github.com/elastic/beats/v7/filebeat/input/v2"
 	cursor "github.com/elastic/beats/v7/filebeat/input/v2/input-cursor"
@@ -86,26 +85,6 @@ func newV1Input(
 	return loginput.NewInput(logCfg, outlet, context)
 }
 
-// configure checks whether the journald input must be created and
-// delegates to journald.Configure if needed.
-func configure(cfg *conf.C) ([]cursor.Source, cursor.Input, error) {
-	jouranl, err := useJournald(cfg)
-	if err != nil {
-		return nil, nil, fmt.Errorf("cannot decide between journald and files: %w", err)
-	}
-
-	if !jouranl {
-		return nil, nil, v2.ErrUnknownInput
-	}
-
-	journaldCfg, err := toJournaldConfig(cfg)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	return journald.Configure(journaldCfg)
-}
-
 // PluginV2 creates a v2.Plugin that will instantiate a journald
 // input if needed.
 func PluginV2(logger *logp.Logger, store cursor.StateStore) v2.Plugin {

filebeat/input/systemlogs/input_linux.go

@@ -0,0 +1,49 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//go:build linux
+
+package systemlogs
+
+import (
+	"fmt"
+
+	"github.com/elastic/beats/v7/filebeat/input/journald"
+	v2 "github.com/elastic/beats/v7/filebeat/input/v2"
+	cursor "github.com/elastic/beats/v7/filebeat/input/v2/input-cursor"
+	conf "github.com/elastic/elastic-agent-libs/config"
+)
+
+// configure checks whether the journald input must be created and
+// delegates to journald.Configure if needed.
+func configure(cfg *conf.C) ([]cursor.Source, cursor.Input, error) {
+	jouranl, err := useJournald(cfg)
+	if err != nil {
+		return nil, nil, fmt.Errorf("cannot decide between journald and files: %w", err)
+	}
+
+	if !jouranl {
+		return nil, nil, v2.ErrUnknownInput
+	}
+
+	journaldCfg, err := toJournaldConfig(cfg)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return journald.Configure(journaldCfg)
+}

filebeat/input/systemlogs/input_other.go

@@ -0,0 +1,31 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//go:build !linux
+
+package systemlogs
+
+import (
+	"errors"
+
+	cursor "github.com/elastic/beats/v7/filebeat/input/v2/input-cursor"
+	conf "github.com/elastic/elastic-agent-libs/config"
+)
+
+func configure(cfg *conf.C) ([]cursor.Source, cursor.Input, error) {
+	return nil, nil, errors.New("journald is only supported on Linux")
+}