feat: support build arm&&arm64 dfget (#1286)

Signed-off-by: Jim Ma <majinjing3@gmail.com>

cmd/dfget/cmd/daemon.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"os"
 	"path"
-	"syscall"
 	"time"
 
 	"github.com/gofrs/flock"
@@ -92,13 +91,13 @@ func redirectStdoutAndStderr(console bool, logDir string) {
 	stdoutPath := path.Join(logDir, "daemon", "stdout.log")
 	if stdout, err := os.OpenFile(stdoutPath, os.O_WRONLY|os.O_CREATE|os.O_APPEND|os.O_SYNC, 0644); err != nil {
 		logger.Warnf("open %s error: %s", stdoutPath, err)
-	} else if err := syscall.Dup2(int(stdout.Fd()), 1); err != nil {
+	} else if err := dup2(int(stdout.Fd()), 1); err != nil {
 		logger.Warnf("redirect stdout error: %s", err)
 	}
 	stderrPath := path.Join(logDir, "daemon", "stderr.log")
 	if stderr, err := os.OpenFile(stderrPath, os.O_WRONLY|os.O_CREATE|os.O_APPEND|os.O_SYNC, 0644); err != nil {
 		logger.Warnf("open %s error: %s", stderrPath, err)
-	} else if err := syscall.Dup2(int(stderr.Fd()), 2); err != nil {
+	} else if err := dup2(int(stderr.Fd()), 2); err != nil {
 		logger.Warnf("redirect stderr error: %s", err)
 	}
 }

cmd/dfget/cmd/daemon_dup2.go

@@ -0,0 +1,26 @@
+//go:build !windows && !arm && !arm64
+// +build !windows,!arm,!arm64
+
+/*
+ *     Copyright 2022 The Dragonfly Authors
+ *
+ * Licensed 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.
+ */
+
+package cmd
+
+import "syscall"
+
+func dup2(from int, to int) (err error) {
+	return syscall.Dup2(from, to)
+}

cmd/dfget/cmd/daemon_dup3.go

@@ -0,0 +1,29 @@
+//go:build !windows && (arm || arm64)
+// +build !windows
+// +build arm arm64
+
+/*
+ *     Copyright 2022 The Dragonfly Authors
+ *
+ * Licensed 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.
+ */
+
+package cmd
+
+import "syscall"
+
+func dup2(from int, to int) (err error) {
+	// linux_arm64 platform doesn't have syscall.Dup2
+	// so use the nearly identical syscall.Dup3 instead.
+	return syscall.Dup3(from, to, 0)
+}