Unit tests for the git store

Also, add the code coverage badge to README.md.
Also, remove gocyclo from the metalinter tests: it was already
a pain to comply with, and all of a sudden started to include
all the vendor code (not sure why? maybe I've updated it by
mistake).

Author: bpineau

Makefile

@@ -26,7 +26,6 @@ lint:
 		--enable=misspell \
 		--enable=gas \
 		--enable=goimports \
-		--enable=gocyclo \
 		./...
 
 fmt:

README.md

@@ -1,6 +1,7 @@
 # katafygio
 
 [![Build Status](https://travis-ci.org/bpineau/katafygio.svg?branch=master)](https://travis-ci.org/bpineau/katafygio)
+[![Coverage Status](https://coveralls.io/repos/github/bpineau/katafygio/badge.svg?branch=master)](https://coveralls.io/github/bpineau/katafygio?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/bpineau/katafygio)](https://goreportcard.com/report/github.com/bpineau/katafygio)
 
 **katafygio** discovers Kubernetes objects (deployments, services, ...),

pkg/store/git/git.go

@@ -12,10 +12,11 @@ package git
 import (
 	"context"
 	"fmt"
-	"os"
 	"os/exec"
 	"time"
 
+	"github.com/spf13/afero"
+
 	"github.com/bpineau/katafygio/config"
 	"github.com/sirupsen/logrus"
 )
@@ -25,6 +26,8 @@ const (
 	checkInterval   = 10 * time.Second
 )
 
+var appFs = afero.NewOsFs()
+
 // Store will maintain a git repository off dumped kube objects
 type Store struct {
 	Logger   *logrus.Logger
@@ -131,15 +134,13 @@ func (s *Store) Status() (changed bool, err error) {
 	return false, nil
 }
 
-// Clone does git clone, or git init (when there's no GiURL to clone from)
-func (s *Store) Clone() error {
-	if s.DryRun {
-		return nil
-	}
-
-	err := os.MkdirAll(s.LocalDir, 0700)
-	if err != nil {
-		return fmt.Errorf("failed to created %s: %v", s.LocalDir, err)
+// Clone does git clone, or git init (when there's no GitURL to clone from)
+func (s *Store) Clone() (err error) {
+	if !s.DryRun {
+		err = appFs.MkdirAll(s.LocalDir, 0700)
+		if err != nil {
+			return fmt.Errorf("failed to create %s: %v", s.LocalDir, err)
+		}
 	}
 
 	if s.URL == "" {

pkg/store/git/git_test.go

@@ -0,0 +1,157 @@
+package git
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/spf13/afero"
+
+	"github.com/bpineau/katafygio/config"
+	"github.com/bpineau/katafygio/pkg/log"
+)
+
+var testHasGit bool
+
+func init() {
+	// Thanks to Mitchell Hashimoto!
+	if _, err := exec.LookPath("git"); err == nil {
+		testHasGit = true
+	}
+}
+
+func TestGitDryRun(t *testing.T) {
+	appFs = afero.NewMemMapFs()
+
+	conf := &config.KfConfig{
+		DryRun:   true,
+		Logger:   log.New("info", "", "test"),
+		LocalDir: "/tmp/ktest", // fake dir (in memory fs provided by Afero)
+	}
+
+	repo, err := New(conf).Start()
+	if err != nil {
+		t.Errorf("failed to start git: %v", err)
+	}
+
+	_, err = repo.Status()
+	if err != nil {
+		t.Error(err)
+	}
+
+	repo.Stop()
+}
+
+// testing with real git repositories and commands
+func TestGit(t *testing.T) {
+	if !testHasGit {
+		t.Log("git not found, skipping")
+		t.Skip()
+	}
+
+	dir, err := ioutil.TempDir("", "katafygio-tests")
+	if err != nil {
+		t.Fatal("failed to create a temp dir for tests")
+	}
+
+	defer os.RemoveAll(dir)
+
+	conf := &config.KfConfig{
+		Logger:   log.New("info", "", "test"),
+		LocalDir: dir,
+	}
+
+	repo, err := New(conf).Start()
+	if err != nil {
+		t.Errorf("failed to start git: %v", err)
+	}
+
+	changed, err := repo.Status()
+	if changed || err != nil {
+		t.Errorf("Status should return false on empty new repos (%v)", err)
+	}
+
+	_ = ioutil.WriteFile(dir+"/t.yaml", []byte{42}, 0600)
+
+	changed, err = repo.Status()
+	if !changed || err != nil {
+		t.Errorf("Status should return true on non committed files (%v)", err)
+	}
+
+	changed, err = repo.Commit()
+	if !changed || err != nil {
+		t.Errorf("Commit should notify changes and not fail (%v)", err)
+	}
+
+	changed, err = repo.Status()
+	if changed || err != nil {
+		t.Errorf("Status should return false after a add+commit (%v)", err)
+	}
+
+	changed, err = repo.Commit()
+	if changed || err != nil {
+		t.Errorf("Commit shouldn't notify changes on unchanged repos (%v)", err)
+	}
+
+	// re-use the previous repos for clone tests
+
+	newdir, err := ioutil.TempDir("", "katafygio-tests")
+	if err != nil {
+		t.Fatal("failed to create a temp dir for tests")
+	}
+
+	defer os.RemoveAll(newdir)
+
+	repo.LocalDir = newdir
+	repo.URL = dir
+
+	err = repo.Clone()
+	if err != nil {
+		t.Errorf("clone failed: %v", err)
+	}
+
+	_ = ioutil.WriteFile(newdir+"/t2.yaml", []byte{42}, 0600)
+	repo.commitAndPush()
+
+	changed, err = repo.Status()
+	if changed || err != nil {
+		t.Errorf("Status should return false after a add+commit+push (%v)", err)
+	}
+
+	repo.Stop()
+
+	// test various failure modes
+
+	_, err = repo.Start()
+	if err == nil {
+		t.Error("Start/Clone on an existing repository should fail")
+	}
+
+	err = repo.Git("fortzob", "42")
+	if err == nil {
+		t.Error("Git should fail with unknown subcommands")
+	}
+
+	if err == nil {
+		t.Error("clone should fail on existing repos")
+	}
+
+	notrepo, err := ioutil.TempDir("", "katafygio-tests")
+	if err != nil {
+		t.Fatal("failed to create a temp dir for tests")
+	}
+
+	defer os.RemoveAll(notrepo)
+
+	repo.LocalDir = notrepo
+	_, err = repo.Status()
+	if err == nil {
+		t.Error("Status should fail on a non-repos")
+	}
+	repo.commitAndPush()
+	_, err = repo.Commit()
+	if err == nil {
+		t.Error("Commit should fail on a non-repos")
+	}
+}