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Original file line number | Diff line number | Diff line change |
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// Copyright 2024 PingCAP, Inc. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
|
||
package main | ||
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import ( | ||
"fmt" | ||
"log" | ||
"os" | ||
"os/exec" | ||
"path/filepath" | ||
"runtime" | ||
"strings" | ||
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"github.com/pingcap/errors" | ||
"github.com/pingcap/failpoint/code" | ||
"golang.org/x/mod/modfile" | ||
) | ||
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var logger = log.New(os.Stderr, "[failpoint-toolexec]", log.LstdFlags) | ||
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func main() { | ||
if len(os.Args) < 2 { | ||
return | ||
} | ||
goCmd, buildArgs := os.Args[1], os.Args[2:] | ||
goCmdBase := filepath.Base(goCmd) | ||
if runtime.GOOS == "windows" { | ||
goCmdBase = strings.TrimSuffix(goCmd, ".exe") | ||
} | ||
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if strings.ToLower(goCmdBase) == "compile" { | ||
if err := injectFailpoint(&buildArgs); err != nil { | ||
logger.Println("failed to inject failpoint", err) | ||
} | ||
} | ||
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cmd := exec.Command(goCmd, buildArgs...) | ||
cmd.Stdout = os.Stdout | ||
cmd.Stderr = os.Stderr | ||
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if err := cmd.Run(); err != nil { | ||
logger.Println("failed to run command", err) | ||
} | ||
} | ||
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func injectFailpoint(argsP *[]string) error { | ||
callersModule, err := findCallersModule() | ||
if err != nil { | ||
return err | ||
} | ||
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// ref https://pkg.go.dev/cmd/compile#hdr-Command_Line | ||
var module string | ||
args := *argsP | ||
for i, arg := range args { | ||
if arg == "-p" { | ||
if i+1 < len(args) { | ||
module = args[i+1] | ||
} | ||
break | ||
} | ||
} | ||
if !strings.HasPrefix(module, callersModule) { | ||
return nil | ||
} | ||
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fileIndices := make([]int, 0, len(args)) | ||
for i, arg := range args { | ||
// find the golang source files of the caller's package | ||
if strings.HasSuffix(arg, ".go") && !inSDKOrMod(arg) { | ||
fileIndices = append(fileIndices, i) | ||
} | ||
} | ||
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needExtraFile := false | ||
writer := &code.Rewriter{} | ||
writer.SetAllowNotChecked(true) | ||
for _, idx := range fileIndices { | ||
needExtraFile = needExtraFile || injectFailpointForFile(writer, &args[idx], module) | ||
} | ||
if needExtraFile { | ||
newFile := filepath.Join(tmpFolder, module, "failpoint_toolexec_extra.go") | ||
if err := writeExtraFile(newFile, writer.GetCurrentFile().Name.Name, module); err != nil { | ||
return err | ||
} | ||
*argsP = append(args, newFile) | ||
} | ||
return nil | ||
} | ||
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// ref https://github.com/golang/go/blob/bdd27c4debfb51fe42df0c0532c1c747777b7a32/src/cmd/go/internal/modload/init.go#L1511 | ||
func findCallersModule() (string, error) { | ||
cwd, err := os.Getwd() | ||
if err != nil { | ||
return "", err | ||
} | ||
dir := filepath.Clean(cwd) | ||
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// Look for enclosing go.mod. | ||
for { | ||
goModPath := filepath.Join(dir, "go.mod") | ||
if fi, err := os.Stat(goModPath); err == nil && !fi.IsDir() { | ||
data, err := os.ReadFile(goModPath) | ||
if err != nil { | ||
return "", err | ||
} | ||
f, err := modfile.ParseLax(goModPath, data, nil) | ||
if err != nil { | ||
return "", err | ||
} | ||
return f.Module.Mod.Path, err | ||
} | ||
d := filepath.Dir(dir) | ||
if d == dir { | ||
break | ||
} | ||
dir = d | ||
} | ||
return "", errors.New("go.mod file not found") | ||
} | ||
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var goModCache = os.Getenv("GOMODCACHE") | ||
var goRoot = runtime.GOROOT() | ||
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func inSDKOrMod(path string) bool { | ||
absPath, err := filepath.Abs(path) | ||
if err != nil { | ||
logger.Println("failed to get absolute path", err) | ||
return false | ||
} | ||
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if goModCache != "" && strings.HasPrefix(absPath, goModCache) { | ||
return true | ||
} | ||
if strings.HasPrefix(absPath, goRoot) { | ||
return true | ||
} | ||
return false | ||
} | ||
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var tmpFolder = filepath.Join(os.TempDir(), "failpoint-toolexec") | ||
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func injectFailpointForFile(w *code.Rewriter, file *string, module string) bool { | ||
newFile := filepath.Join(tmpFolder, module, filepath.Base(*file)) | ||
newFileDir := filepath.Dir(newFile) | ||
if err := os.MkdirAll(newFileDir, 0700); err != nil { | ||
logger.Println("failed to create temp folder", err) | ||
return false | ||
} | ||
f, err := os.OpenFile(newFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600) | ||
if err != nil { | ||
logger.Println("failed to open temp file", err) | ||
return false | ||
} | ||
defer f.Close() | ||
w.SetOutput(f) | ||
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if err := w.RewriteFile(*file); err != nil { | ||
logger.Println("failed to rewrite file", err) | ||
return false | ||
} | ||
if !w.GetRewritten() { | ||
return false | ||
} | ||
*file = newFile | ||
return true | ||
} | ||
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func writeExtraFile(filePath, packageName, module string) error { | ||
bindingContent := fmt.Sprintf(` | ||
package %s | ||
func %s(name string) string { | ||
return "%s/" + name | ||
} | ||
`, packageName, code.ExtendPkgName, module) | ||
return os.WriteFile(filePath, []byte(bindingContent), 0644) | ||
} |
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