fix: guard os.Args access for wasm which panics when building (#4762)

This pull request improves the reliability and safety of server restart
and reload operations by ensuring the correct retrieval of the current
executable path and process arguments. It replaces direct usage of
`os.Args[0]` with a more robust approach using `gfile.SelfPath()`, and
adds error handling for cases where the executable path cannot be
determined. Additionally, it introduces a helper function to safely
obtain process arguments, and removes an unnecessary import.

**Executable Path Handling and Error Checking:**

- Replaced usage of `os.Args[0]` with `gfile.SelfPath()` throughout the
server admin and process management code to reliably determine the
current executable path; added checks and error responses when the path
cannot be determined.
[[1]](diffhunk://#diff-0d174b149c56c4aa7ffeba2be94d16dc1b8000933f1f2a2e6bf011acdad3272fL122-R134)
[[2]](diffhunk://#diff-0d174b149c56c4aa7ffeba2be94d16dc1b8000933f1f2a2e6bf011acdad3272fL168-R184)
[[3]](diffhunk://#diff-3b4265be7ef0335b832dacfc2fc7ddc0f9dfae5b81340ff57d2b6a526c60d9e1L62-R65)
- Added early returns in initialization functions if `os.Args` is empty,
preventing potential panics or misbehavior when the argument list is
missing.
[[1]](diffhunk://#diff-0aa99f033274ea60b9c466ae4fc98d0816ec13781d8ec787fb3ef106a49a79ecR35-R37)
[[2]](diffhunk://#diff-5782fa47aa858b8e8358fd50353b050ee30418b7844b36e313e9c6d01188c092R47-R49)

**Process Argument Handling:**

- Introduced the `getCurrentProcessArgs()` helper function to safely
return process arguments (excluding the program name), ensuring correct
behavior even if no arguments are provided. Updated process creation
calls to use this helper.

**Code Cleanup:**

- Removed an unused import of the `os` package from
`ghttp_server_admin.go`.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

debug/gdebug/gdebug_caller.go

@@ -32,6 +32,9 @@ func init() {
 	if goRootForFilter != "" {
 		goRootForFilter = strings.ReplaceAll(goRootForFilter, "\\", "/")
 	}
+	if len(os.Args) == 0 {
+		return
+	}
 	// Initialize internal package variable: selfPath.
 	selfPath, _ = exec.LookPath(os.Args[0])
 	if selfPath != "" {

net/ghttp/ghttp_server_admin.go

@@ -8,7 +8,6 @@ package ghttp
 
 import (
 	"context"
-	"os"
 	"strings"
 	"time"
 
@@ -59,7 +58,11 @@ func (p *utilAdmin) Restart(r *Request) {
 	// Custom start binary path when this process exits.
 	path := r.GetQuery("newExeFilePath").String()
 	if path == "" {
-		path = os.Args[0]
+		path = gfile.SelfPath()
+	}
+	if path == "" {
+		r.Response.WriteExit("cannot determine current executable path")
+		return
 	}
 	if err = RestartAllServer(ctx, path); err == nil {
 		r.Response.WriteExit("server restarted")

net/ghttp/ghttp_server_admin_process.go

@@ -119,16 +119,25 @@ func checkActionFrequency() error {
 // forkReloadProcess creates a new child process and copies the fd to child process.
 func forkReloadProcess(ctx context.Context, newExeFilePath ...string) error {
 	var (
-		binaryPath = os.Args[0]
+		binaryPath = gfile.SelfPath()
 	)
 	if len(newExeFilePath) > 0 && newExeFilePath[0] != "" {
 		binaryPath = newExeFilePath[0]
 	}
+	if binaryPath == "" {
+		return gerror.NewCodef(
+			gcode.CodeInvalidOperation,
+			"cannot determine current executable path: gfile.SelfPath() returned empty and no executable override was provided (goos=%s, goarch=%s, overrideProvided=%t)",
+			runtime.GOOS,
+			runtime.GOARCH,
+			len(newExeFilePath) > 0 && newExeFilePath[0] != "",
+		)
+	}
 	if !gfile.Exists(binaryPath) {
 		return gerror.Newf(`binary file path "%s" does not exist`, binaryPath)
 	}
 	var (
-		p   = gproc.NewProcess(binaryPath, os.Args[1:], os.Environ())
+		p   = gproc.NewProcess(binaryPath, getCurrentProcessArgs(), os.Environ())
 		sfm = getServerFdMap()
 	)
 	for name, m := range sfm {
@@ -165,17 +174,20 @@ func forkReloadProcess(ctx context.Context, newExeFilePath ...string) error {
 // forkRestartProcess creates a new server process.
 func forkRestartProcess(ctx context.Context, newExeFilePath ...string) error {
 	var (
-		path = os.Args[0]
+		path = gfile.SelfPath()
 	)
 	if len(newExeFilePath) > 0 && newExeFilePath[0] != "" {
 		path = newExeFilePath[0]
 	}
+	if path == "" {
+		return gerror.NewCode(gcode.CodeInvalidOperation, "cannot determine current executable path")
+	}
 	if err := os.Unsetenv(adminActionReloadEnvKey); err != nil {
 		intlog.Errorf(ctx, `%+v`, err)
 	}
 	env := os.Environ()
 	env = append(env, adminActionRestartEnvKey+"=1")
-	p := gproc.NewProcess(path, os.Args[1:], env)
+	p := gproc.NewProcess(path, getCurrentProcessArgs(), env)
 	if _, err := p.Start(ctx); err != nil {
 		glog.Errorf(
 			ctx,
@@ -187,6 +199,13 @@ func forkRestartProcess(ctx context.Context, newExeFilePath ...string) error {
 	return nil
 }
 
+func getCurrentProcessArgs() []string {
+	if len(os.Args) > 1 {
+		return os.Args[1:]
+	}
+	return nil
+}
+
 // getServerFdMap returns all the servers name to file descriptor mapping as map.
 func getServerFdMap() map[string]listenerFdMap {
 	sfm := make(map[string]listenerFdMap)

os/gfile/gfile.go

@@ -44,6 +44,9 @@ var (
 )
 
 func init() {
+	if len(os.Args) == 0 {
+		return
+	}
 	// Initialize internal package variable: selfPath.
 	selfPath, _ = exec.LookPath(os.Args[0])
 	if selfPath != "" {