github.com/pingcap/failpoint@v0.0.0-20240412033321-fd0796e60f86/failpoint-ctl/main.go (about)

     1  // Copyright 2019 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  	"path/filepath"
    21  
    22  	"github.com/pingcap/failpoint/code"
    23  	"github.com/pingcap/failpoint/failpoint-ctl/version"
    24  )
    25  
    26  func main() {
    27  	if len(os.Args) < 2 || (os.Args[1] != "enable" && os.Args[1] != "disable" && os.Args[1] != "-V") {
    28  		usage()
    29  	}
    30  
    31  	if os.Args[1] == "-V" {
    32  		version.PrintVersion()
    33  		os.Exit(0)
    34  	}
    35  
    36  	// Use current work path if user does not specify any path
    37  	paths := os.Args[2:]
    38  	if len(paths) == 0 {
    39  		wd, err := os.Getwd()
    40  		if err != nil {
    41  			fmt.Println("Get work directory error: " + err.Error())
    42  			os.Exit(1)
    43  		}
    44  		paths = append(paths, wd)
    45  	}
    46  
    47  	// Expand all paths to its absolute path form
    48  	for i := range paths {
    49  		absPath, err := filepath.Abs(paths[i])
    50  		if err != nil {
    51  			fmt.Println("Error occurred in absolute path " + paths[i] + " with " + err.Error())
    52  			os.Exit(1)
    53  		}
    54  		realPath, err := filepath.EvalSymlinks(absPath)
    55  		if err != nil {
    56  			fmt.Println("Error resolving symbolic link "+absPath+", ", err.Error())
    57  			os.Exit(1)
    58  		}
    59  		paths[i] = realPath
    60  	}
    61  
    62  	switch os.Args[1] {
    63  	case "enable":
    64  		var rewritePath []string
    65  		var errOccurred bool
    66  		for _, path := range paths {
    67  			rewritePath = append(rewritePath, path)
    68  			rewriter := code.NewRewriter(path)
    69  			if err := rewriter.Rewrite(); err != nil {
    70  				fmt.Println("Rewrite error " + err.Error())
    71  				errOccurred = true
    72  				break
    73  			}
    74  		}
    75  		// Restore all paths which have been rewrited if any error occurred
    76  		// to avoid partial rewrite state which maybe make user strange.
    77  		if errOccurred {
    78  			restoreFiles(rewritePath)
    79  			os.Exit(1)
    80  		}
    81  	case "disable":
    82  		restoreFiles(paths)
    83  	}
    84  }
    85  
    86  func usage() {
    87  	fmt.Println("failpoint-ctl enable/disable /target/path [/target/path2 /target/path3 ...]")
    88  	os.Exit(1)
    89  }
    90  
    91  func restoreFiles(paths []string) {
    92  	for i := range paths {
    93  		restorer := code.NewRestorer(paths[i])
    94  		err := restorer.Restore()
    95  		if err != nil {
    96  			fmt.Println("Restore error " + err.Error())
    97  		}
    98  	}
    99  }