implement Executor pattern

internal/executor/executor.go

@@ -0,0 +1,11 @@
+package executor
+
+import (
+	"context"
+	"os/exec"
+)
+
+type Executor interface {
+	CombinedOutput(context.Context, string, ...string) ([]byte, error)
+	CommandContext(context.Context, string, ...string) *exec.Cmd
+}

internal/executor/local.go

@@ -0,0 +1,16 @@
+package executor
+
+import (
+	"context"
+	"os/exec"
+)
+
+type LocalExecutor struct{}
+
+func (l LocalExecutor) CombinedOutput(ctx context.Context, name string, arg ...string) ([]byte, error) {
+	return l.CommandContext(ctx, name, arg...).CombinedOutput()
+}
+
+func (l LocalExecutor) CommandContext(ctx context.Context, name string, arg ...string) *exec.Cmd {
+	return exec.CommandContext(ctx, name, arg...)
+}

internal/executor/ssh.go

@@ -0,0 +1,21 @@
+package executor
+
+import (
+	"context"
+	"os/exec"
+)
+
+type SSHExecutor struct {
+	SSHTarget string
+}
+
+func (s SSHExecutor) CombinedOutput(ctx context.Context, name string, arg ...string) ([]byte, error) {
+	return s.CommandContext(ctx, name, arg...).CombinedOutput()
+}
+
+func (s SSHExecutor) CommandContext(ctx context.Context, name string, arg ...string) *exec.Cmd {
+	newArg := append([]string{s.SSHTarget, name}, arg...)
+	cmd := exec.CommandContext(ctx, "ssh", newArg...)
+
+	return cmd
+}