1 files changed, 74 insertions, 0 deletions
diff --git a/misc/dashboard/builder/exec.go b/misc/dashboard/builder/exec.go
new file mode 100644
index 000000000..a042c5699
--- /dev/null
+++ b/misc/dashboard/builder/exec.go
@@ -0,0 +1,74 @@
+// Copyright 2011 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.
+
+package main
+
+import (
+	"bytes"
+	"exec"
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+// run is a simple wrapper for exec.Run/Close
+func run(envv []string, dir string, argv ...string) os.Error {
+	if *verbose {
+		log.Println("run", argv)
+	}
+	argv = useBash(argv)
+	cmd := exec.Command(argv[0], argv[1:]...)
+	cmd.Dir = dir
+	cmd.Env = envv
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}
+
+// runLog runs a process and returns the combined stdout/stderr, 
+// as well as writing it to logfile (if specified). It returns
+// process combined stdout and stderr output, exit status and error.
+// The error returned is nil, if process is started successfully,
+// even if exit status is not 0.
+func runLog(envv []string, logfile, dir string, argv ...string) (string, int, os.Error) {
+	if *verbose {
+		log.Println("runLog", argv)
+	}
+	argv = useBash(argv)
+
+	b := new(bytes.Buffer)
+	var w io.Writer = b
+	if logfile != "" {
+		f, err := os.OpenFile(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
+		if err != nil {
+			return "", 0, err
+		}
+		defer f.Close()
+		w = io.MultiWriter(f, b)
+	}
+
+	cmd := exec.Command(argv[0], argv[1:]...)
+	cmd.Dir = dir
+	cmd.Env = envv
+	cmd.Stdout = w
+	cmd.Stderr = w
+
+	err := cmd.Run()
+	if err != nil {
+		if ws, ok := err.(*os.Waitmsg); ok {
+			return b.String(), ws.ExitStatus(), nil
+		}
+	}
+	return b.String(), 0, nil
+}
+
+// useBash prefixes a list of args with 'bash' if the first argument
+// is a bash script.
+func useBash(argv []string) []string {
+	// TODO(brainman): choose a more reliable heuristic here.
+	if strings.HasSuffix(argv[0], ".bash") {
+		argv = append([]string{"bash"}, argv...)
+	}
+	return argv
+}