src migrate early WIP

cmd/src/migrate.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"github.com/sourcegraph/sourcegraph/lib/errors"
+)
+
+type genericData struct {
+	data []byte
+	err  error
+}
+
+func runDockerCommand(ctx context.Context, cmd string, args ...string) *genericData {
+	f := &genericData{}
+
+	f.data, f.err = exec.Command(cmd, args...).CombinedOutput()
+	if f.err != nil {
+		f.err = errors.Wrapf(f.err, "executing command: %s %s: received error: %s", cmd, strings.Join(args, " "), f.data)
+	}
+	return f
+}
+
+func init() {
+	usage := `'src migrate' helps you migrate your sourcegraph data to another instance.
+
+Usage:
+
+    TBD
+
+Examples:
+
+	TBD
+`
+
+	var container string
+	var outputPath string
+
+	flagSet := flag.NewFlagSet("migrate", flag.ExitOnError)
+	flagSet.StringVar(&container, "c", "", "The container to target")
+	flagSet.StringVar(&outputPath, "o", "", "The path for the output file")
+
+	handler := func(args []string) error {
+		fmt.Fprintf(flag.CommandLine.Output(), "From container: %s'", container)
+
+		// init context
+		ctx := context.Background()
+
+		data := runDockerCommand(
+			ctx,
+			"docker", "exec", container, "sh", "-c", "'pg_dump -C --username=postgres sourcegraph' > "+outputPath,
+		)
+		if data.err != nil {
+			fmt.Println("Error:", data.err)
+		}
+
+		return nil
+	}
+
+	// Register the command.
+	commands = append(commands, &command{
+		flagSet: flagSet,
+		aliases: []string{"migrate"},
+		handler: handler,
+		usageFunc: func() {
+			fmt.Println(usage)
+		},
+	})
+}