Add a library for running external commands, providing timeouts and test injection.

go/util/command.go

 package util
 
 import (
-        "os/exec"
-        "strings"
-
-        "github.com/skia-dev/glog"
+        "go.skia.org/infra/go/exec"
 )
 
 // DoCmd executes the given command line string; the command being
 // run is expected to not care what its current working directory is.
-// Returns the stdout and stderr.  If there is an error, the
-// returned error will be of type ExitError, which the caller
-// can use to find out more about what happened.
+// Returns the stdout and stderr.
 func DoCmd(commandLine string) (string, error) {
-        glog.Infof("Command: %q\n", commandLine)
-        programAndArgs := strings.SplitN(commandLine, " ", 2)
-        program := programAndArgs[0]
-        args := []string{}
-        if len(programAndArgs) > 1 {
-                args = strings.Split(programAndArgs[1], " ")
-        }
-        cmd := exec.Command(program, args...)
-        message, err := cmd.CombinedOutput()
-        glog.Infof("StdOut + StdErr: %s\n", string(message))
-        if err != nil {
-                glog.Errorf("Exit status: %s\n", err)
-                return string(message), err
-        }
-        return string(message), nil
+        return exec.RunSimple(commandLine)
 }