add a debug flag to log the rc file for bash initialization

pkg/base/base.go

@@ -30,6 +30,7 @@ const MShellPathVarName = "MSHELL_PATH"
 const MShellHomeVarName = "MSHELL_HOME"
 const MShellInstallBinVarName = "MSHELL_INSTALLBIN_PATH"
 const SSHCommandVarName = "SSH_COMMAND"
+const MShellDebugVarName = "MSHELL_DEBUG"
 const SessionsDirBaseName = "sessions"
 const MShellVersion = "v0.2.0"
 const RemoteIdFile = "remoteid"
@@ -37,6 +38,9 @@ const DefaultMShellInstallBinDir = "/opt/mshell/bin"
 const LogFileName = "mshell.log"
 const ForceDebugLog = false
 
+const DebugFlag_LogRcFile = "logrc"
+const LogRcFileName = "debug.rcfile"
+
 var sessionDirCache = make(map[string]string)
 var baseLock = &sync.Mutex{}
 var DebugLogEnabled = false
@@ -146,6 +150,23 @@ func (ckey CommandKey) Validate(typeStr string) error {
 	return nil
 }
 
+func HasDebugFlag(envMap map[string]string, flagName string) bool {
+	msDebug := envMap[MShellDebugVarName]
+	flags := strings.Split(msDebug, ",")
+	Logf("hasdebugflag[%s]: %s [%#v]\n", flagName, msDebug, flags)
+	for _, flag := range flags {
+		if strings.TrimSpace(flag) == flagName {
+			return true
+		}
+	}
+	return false
+}
+
+func GetDebugRcFileName() string {
+	msHome := GetMShellHomeDir()
+	return path.Join(msHome, LogRcFileName)
+}
+
 func GetHomeDir() string {
 	homeVar := os.Getenv(HomeVarName)
 	if homeVar == "" {

pkg/shexec/shexec.go

@@ -24,11 +24,11 @@ import (
 	"time"
 
 	"github.com/alessio/shellescape"
-	"github.com/creack/pty"
 	"github.com/commandlinedev/apishell/pkg/base"
 	"github.com/commandlinedev/apishell/pkg/cirfile"
 	"github.com/commandlinedev/apishell/pkg/mpio"
 	"github.com/commandlinedev/apishell/pkg/packet"
+	"github.com/creack/pty"
 	"golang.org/x/mod/semver"
 	"golang.org/x/sys/unix"
 )
@@ -1081,6 +1081,14 @@ func RunCommandSimple(pk *packet.RunPacketType, sender *packet.PacketSender, fro
 		trapCmdStr := makeExitTrap(cmd.ReturnState.FdNum)
 		rcFileStr += trapCmdStr
 	}
+	shellVarMap := ShellVarMapFromState(state)
+	if base.HasDebugFlag(shellVarMap, base.DebugFlag_LogRcFile) {
+		debugRcFileName := base.GetDebugRcFileName()
+		err := os.WriteFile(debugRcFileName, []byte(rcFileStr), 0600)
+		if err != nil {
+			base.Logf("error writing %s: %v\n", debugRcFileName, err)
+		}
+	}
 	rcFileFdNum, err := AddRunData(pk, rcFileStr, "rcfile")
 	if err != nil {
 		return nil, err