Moves to official vendoring solution

vendor/github.com/onsi/gomega/gexec/exit_matcher.go

@@ -0,0 +1,88 @@
+package gexec
+
+import (
+	"fmt"
+
+	"github.com/onsi/gomega/format"
+)
+
+/*
+The Exit matcher operates on a session:
+
+	Ω(session).Should(Exit(<optional status code>))
+
+Exit passes if the session has already exited.
+
+If no status code is provided, then Exit will succeed if the session has exited regardless of exit code.
+Otherwise, Exit will only succeed if the process has exited with the provided status code.
+
+Note that the process must have already exited.  To wait for a process to exit, use Eventually:
+
+	Eventually(session, 3).Should(Exit(0))
+*/
+func Exit(optionalExitCode ...int) *exitMatcher {
+	exitCode := -1
+	if len(optionalExitCode) > 0 {
+		exitCode = optionalExitCode[0]
+	}
+
+	return &exitMatcher{
+		exitCode: exitCode,
+	}
+}
+
+type exitMatcher struct {
+	exitCode       int
+	didExit        bool
+	actualExitCode int
+}
+
+type Exiter interface {
+	ExitCode() int
+}
+
+func (m *exitMatcher) Match(actual interface{}) (success bool, err error) {
+	exiter, ok := actual.(Exiter)
+	if !ok {
+		return false, fmt.Errorf("Exit must be passed a gexec.Exiter (Missing method ExitCode() int) Got:\n%s", format.Object(actual, 1))
+	}
+
+	m.actualExitCode = exiter.ExitCode()
+
+	if m.actualExitCode == -1 {
+		return false, nil
+	}
+
+	if m.exitCode == -1 {
+		return true, nil
+	}
+	return m.exitCode == m.actualExitCode, nil
+}
+
+func (m *exitMatcher) FailureMessage(actual interface{}) (message string) {
+	if m.actualExitCode == -1 {
+		return "Expected process to exit.  It did not."
+	} else {
+		return format.Message(m.actualExitCode, "to match exit code:", m.exitCode)
+	}
+}
+
+func (m *exitMatcher) NegatedFailureMessage(actual interface{}) (message string) {
+	if m.actualExitCode == -1 {
+		return "you really shouldn't be able to see this!"
+	} else {
+		if m.exitCode == -1 {
+			return "Expected process not to exit.  It did."
+		} else {
+			return format.Message(m.actualExitCode, "not to match exit code:", m.exitCode)
+		}
+	}
+}
+
+func (m *exitMatcher) MatchMayChangeInTheFuture(actual interface{}) bool {
+	session, ok := actual.(*Session)
+	if ok {
+		return session.ExitCode() == -1
+	}
+	return true
+}