Implement blackbox in Golang (#250)

* Initial release

pkg/vcs/none/none.go

@@ -0,0 +1,79 @@
+package none
+
+import (
+	"fmt"
+
+	"github.com/StackExchange/blackbox/v2/pkg/commitlater"
+	"github.com/StackExchange/blackbox/v2/pkg/vcs"
+)
+
+var pluginName = "NONE"
+
+func init() {
+	vcs.Register(pluginName, 0, newNone)
+}
+
+// VcsHandle is
+type VcsHandle struct {
+	repoRoot string
+}
+
+func newNone() (vcs.Vcs, error) {
+	return &VcsHandle{}, nil
+}
+
+// Name returns my name.
+func (v VcsHandle) Name() string {
+	return pluginName
+}
+
+// Discover returns true if we are a repo of this type; along with the Abs path to the repo root (or "" if we don't know).
+func (v VcsHandle) Discover() (bool, string) {
+	return true, "" // We don't know the root.
+}
+
+//// SetRepoRoot informs the Vcs of the VCS root.
+//func (v *VcsHandle) SetRepoRoot(dir string) {
+//	v.repoRoot = dir
+//}
+
+// SetFileTypeUnix informs the VCS that files should maintain unix-style line endings.
+func (v VcsHandle) SetFileTypeUnix(repobasedir string, files ...string) error {
+	return nil
+}
+
+// IgnoreAnywhere tells the VCS to ignore these files anywhere in the repo.
+func (v VcsHandle) IgnoreAnywhere(repobasedir string, files []string) error {
+	return nil
+}
+
+// IgnoreFiles tells the VCS to ignore these files anywhere in the repo.
+func (v VcsHandle) IgnoreFiles(repobasedir string, files []string) error {
+	return nil
+}
+
+// CommitTitle sets the title of the next commit.
+func (v VcsHandle) CommitTitle(title string) {}
+
+// NeedsCommit queues up commits for later execution.
+func (v VcsHandle) NeedsCommit(message string, repobasedir string, names []string) {
+	return
+}
+
+// DebugCommits dumps a list of future commits.
+func (v VcsHandle) DebugCommits() commitlater.List {
+	return commitlater.List{}
+}
+
+// FlushCommits informs the VCS to do queued up commits.
+func (v VcsHandle) FlushCommits() error {
+	return nil
+}
+
+// The following are "secret" functions only used by the integration testing system.
+
+// TestingInitRepo initializes a repo.
+func (v VcsHandle) TestingInitRepo() error {
+	fmt.Println("VCS=none, TestingInitRepo")
+	return nil
+}