Add support for git volumes.

pkg/util/exec/exec.go

@@ -36,6 +36,7 @@ type Cmd interface {
 	// CombinedOutput runs the command and returns its combined standard output
 	// and standard error.  This follows the pattern of package os/exec.
 	CombinedOutput() ([]byte, error)
+	SetDir(dir string)
 }
 
 // ExitError is an interface that presents an API similar to os.ProcessState, which is
@@ -64,6 +65,10 @@ func (executor *executor) Command(cmd string, args ...string) Cmd {
 // Wraps exec.Cmd so we can capture errors.
 type cmdWrapper osexec.Cmd
 
+func (cmd *cmdWrapper) SetDir(dir string) {
+	cmd.Dir = dir
+}
+
 // CombinedOutput is part of the Cmd interface.
 func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
 	out, err := (*osexec.Cmd)(cmd).CombinedOutput()

pkg/util/exec/fake_exec.go

@@ -0,0 +1,92 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 exec
+
+import (
+	"fmt"
+)
+
+// A simple scripted Interface type.
+type FakeExec struct {
+	CommandScript []FakeCommandAction
+	CommandCalls  int
+}
+
+type FakeCommandAction func(cmd string, args ...string) Cmd
+
+func (fake *FakeExec) Command(cmd string, args ...string) Cmd {
+	if fake.CommandCalls > len(fake.CommandScript)-1 {
+		panic("ran out of Command() actions")
+	}
+	i := fake.CommandCalls
+	fake.CommandCalls++
+	return fake.CommandScript[i](cmd, args...)
+}
+
+// A simple scripted Cmd type.
+type FakeCmd struct {
+	Argv                 []string
+	CombinedOutputScript []FakeCombinedOutputAction
+	CombinedOutputCalls  int
+	CombinedOutputLog    [][]string
+	Dirs                 []string
+}
+
+func InitFakeCmd(fake *FakeCmd, cmd string, args ...string) Cmd {
+	fake.Argv = append([]string{cmd}, args...)
+	return fake
+}
+
+type FakeCombinedOutputAction func() ([]byte, error)
+
+func (fake *FakeCmd) SetDir(dir string) {
+	fake.Dirs = append(fake.Dirs, dir)
+}
+
+func (fake *FakeCmd) CombinedOutput() ([]byte, error) {
+	if fake.CombinedOutputCalls > len(fake.CombinedOutputScript)-1 {
+		panic("ran out of CombinedOutput() actions")
+	}
+	if fake.CombinedOutputLog == nil {
+		fake.CombinedOutputLog = [][]string{}
+	}
+	i := fake.CombinedOutputCalls
+	fake.CombinedOutputLog = append(fake.CombinedOutputLog, append([]string{}, fake.Argv...))
+	fake.CombinedOutputCalls++
+	return fake.CombinedOutputScript[i]()
+}
+
+// A simple fake ExitError type.
+type FakeExitError struct {
+	Status int
+}
+
+func (fake *FakeExitError) String() string {
+	return fmt.Sprintf("exit %d", fake.Status)
+}
+
+func (fake *FakeExitError) Error() string {
+	return fake.String()
+}
+
+func (fake *FakeExitError) Exited() bool {
+	return true
+}
+
+func (fake *FakeExitError) ExitStatus() int {
+	return fake.Status
+}