tools: use os home dir to instead of the hardcoded PATH (#6498)

tools/tm-signer-harness/Makefile

@@ -3,7 +3,7 @@
 TENDERMINT_VERSION?=latest
 BUILD_TAGS?='tendermint'
 VERSION := $(shell git describe --always)
-BUILD_FLAGS = -ldflags "-X github.com/tendermint/tendermint/version.TMCoreSemVer=$(VERSION)
+BUILD_FLAGS = -ldflags "-X github.com/tendermint/tendermint/version.TMCoreSemVer=$(VERSION)"
 
 .DEFAULT_GOAL := build
 

tools/tm-signer-harness/main.go

@@ -18,12 +18,13 @@ import (
 const (
 	defaultAcceptRetries    = 100
 	defaultBindAddr         = "tcp://127.0.0.1:0"
-	defaultTMHome           = "~/.tendermint"
 	defaultAcceptDeadline   = 1
 	defaultConnDeadline     = 3
 	defaultExtractKeyOutput = "./signing.key"
 )
 
+var defaultTMHome string
+
 var logger = log.NewTMLogger(log.NewSyncWriter(os.Stdout))
 
 // Command line flags
@@ -60,6 +61,14 @@ Use "tm-signer-harness help <command>" for more information about that command.`
 		fmt.Println("")
 	}
 
+	hd, err := os.UserHomeDir()
+	if err != nil {
+		fmt.Println("The UserHomeDir is not defined, setting the default TM Home PATH to \"~/.tendermint\"")
+		defaultTMHome = "~/.tendermint"
+	} else {
+		defaultTMHome = fmt.Sprintf("%s/.tendermint", hd)
+	}
+
 	runCmd = flag.NewFlagSet("run", flag.ExitOnError)
 	runCmd.IntVar(&flagAcceptRetries,
 		"accept-retries",