port across confix tool

scripts/confix/confix.go

@@ -0,0 +1,54 @@
+// Program confix applies changes to a Tendermint TOML configuration file, to
+// update configurations created with an older version of Tendermint to a
+// compatible format for a newer version.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/tendermint/tendermint/libs/confix"
+)
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, `Usage: %[1]s -config <src> [-out <dst>]
+
+Modify the contents of the specified -config TOML file to update the names,
+locations, and values of configuration settings to the current configuration
+layout. The output is written to -out, or to stdout.
+
+It is valid to set -config and -out to the same path. In that case, the file will
+be modified in-place. In case of any error in updating the file, no output is
+written.
+
+Options:
+`, filepath.Base(os.Args[0]))
+		flag.PrintDefaults()
+	}
+}
+
+var (
+	configPath = flag.String("config", "", "Config file path (required)")
+	outPath    = flag.String("out", "", "Output file path (default stdout)")
+	doVerbose  = flag.Bool("v", false, "Log changes to stderr")
+)
+
+func main() {
+	flag.Parse()
+	if *configPath == "" {
+		log.Fatal("You must specify a non-empty -config path")
+	}
+
+	ctx := context.Background()
+	if *doVerbose {
+		ctx = confix.WithLogWriter(ctx, os.Stderr)
+	}
+	if err := confix.Upgrade(ctx, *configPath, *outPath); err != nil {
+		log.Fatalf("Upgrading config: %v", err)
+	}
+}