1 files changed, 72 insertions, 0 deletions
diff --git a/src/cmd/api/run.go b/src/cmd/api/run.go
new file mode 100644
index 0000000..ecb1d0f
--- /dev/null
+++ b/src/cmd/api/run.go
@@ -0,0 +1,72 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// The run program is invoked via the dist tool.
+// To invoke manually: go tool dist test -run api --no-rebuild
+package main
+
+import (
+	"fmt"
+	exec "internal/execabs"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+func goCmd() string {
+	var exeSuffix string
+	if runtime.GOOS == "windows" {
+		exeSuffix = ".exe"
+	}
+	path := filepath.Join(runtime.GOROOT(), "bin", "go"+exeSuffix)
+	if _, err := os.Stat(path); err == nil {
+		return path
+	}
+	return "go"
+}
+
+var goroot string
+
+func main() {
+	log.SetFlags(0)
+	goroot = os.Getenv("GOROOT") // should be set by run.{bash,bat}
+	if goroot == "" {
+		log.Fatal("No $GOROOT set.")
+	}
+
+	apiDir := filepath.Join(goroot, "api")
+	out, err := exec.Command(goCmd(), "tool", "api",
+		"-c", findAPIDirFiles(apiDir),
+		"-next", filepath.Join(apiDir, "next.txt"),
+		"-except", filepath.Join(apiDir, "except.txt")).CombinedOutput()
+	if err != nil {
+		log.Fatalf("Error running API checker: %v\n%s", err, out)
+	}
+	fmt.Print(string(out))
+}
+
+// findAPIDirFiles returns a comma-separated list of Go API files
+// (go1.txt, go1.1.txt, etc.) located in apiDir.
+func findAPIDirFiles(apiDir string) string {
+	dir, err := os.Open(apiDir)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer dir.Close()
+	fs, err := dir.Readdirnames(-1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	var apiFiles []string
+	for _, fn := range fs {
+		if strings.HasPrefix(fn, "go1") {
+			apiFiles = append(apiFiles, filepath.Join(apiDir, fn))
+		}
+	}
+	return strings.Join(apiFiles, ",")
+}