Delete internal directory

internal/security/shell_background_io.go

@@ -1,111 +0,0 @@
-package security
-
-import "strings"
-
-const backgroundJobStdioRedirect = " </dev/null >/dev/null 2>&1"
-
-// findStandaloneAmpersandPositions 返回不在引号内的独立 & 下标（排除 &&）。
-func findStandaloneAmpersandPositions(command string) []int {
-	command = strings.TrimSpace(command)
-	if command == "" {
-		return nil
-	}
-
-	var positions []int
-	inSingleQuote := false
-	inDoubleQuote := false
-	escaped := false
-
-	for i := 0; i < len(command); i++ {
-		r := command[i]
-		if escaped {
-			escaped = false
-			continue
-		}
-		if r == '\\' {
-			escaped = true
-			continue
-		}
-		if r == '\'' && !inDoubleQuote {
-			inSingleQuote = !inSingleQuote
-			continue
-		}
-		if r == '"' && !inSingleQuote {
-			inDoubleQuote = !inDoubleQuote
-			continue
-		}
-		if r != '&' || inSingleQuote || inDoubleQuote {
-			continue
-		}
-		if i+1 < len(command) && command[i+1] == '&' {
-			continue
-		}
-		if i > 0 && command[i-1] == '&' {
-			continue
-		}
-
-		isStandalone := i == 0
-		if !isStandalone {
-			prev := command[i-1]
-			isStandalone = prev == ' ' || prev == '\t' || prev == '\n' || prev == '\r'
-		}
-		if !isStandalone {
-			continue
-		}
-		if i == len(command)-1 {
-			positions = append(positions, i)
-			continue
-		}
-		next := command[i+1]
-		if next == ' ' || next == '\t' || next == '\n' || next == '\r' {
-			positions = append(positions, i)
-		}
-	}
-	return positions
-}
-
-func segmentHasStdioRedirect(segment string) bool {
-	lower := strings.ToLower(strings.TrimSpace(segment))
-	if lower == "" {
-		return false
-	}
-	if strings.Contains(lower, ">/dev/null") || strings.Contains(lower, "2>/dev/null") {
-		return true
-	}
-	if strings.Contains(lower, "&>") || strings.Contains(lower, "&>>") {
-		return true
-	}
-	if strings.Contains(lower, "2>&1") && strings.Contains(lower, "/dev/null") {
-		return true
-	}
-	return false
-}
-
-// RedirectBackgroundJobStdio 为每个独立 & 前的后台段注入 </dev/null >/dev/null 2>&1，
-// 避免后台子进程占用 execute/exec 管道导致挂死。
-func RedirectBackgroundJobStdio(command string) string {
-	positions := findStandaloneAmpersandPositions(command)
-	if len(positions) == 0 {
-		return command
-	}
-
-	out := command
-	for j := len(positions) - 1; j >= 0; j-- {
-		i := positions[j]
-		before := out[:i]
-		after := out[i:]
-		trimmed := strings.TrimRight(before, " \t\r\n")
-		if segmentHasStdioRedirect(trimmed) {
-			continue
-		}
-		trailing := before[len(trimmed):]
-		out = trimmed + backgroundJobStdioRedirect + trailing + after
-	}
-	return out
-}
-
-// PrepareShellCommandForExecute 组合 execute/exec 用的非交互包装与后台 IO 重定向。
-// 须先注入 exec </dev/null，再改写 & 后台段，否则段内 </dev/null 会使 stdin 重定向被误判为已存在。
-func PrepareShellCommandForExecute(shellCommand string) string {
-	return RedirectBackgroundJobStdio(PrepareNonInteractiveShellCommand(shellCommand))
-}