Prevent git from considering .git in parent directories

When the target directory doesn't (yet) contains .git, git
will look for this .git directory recursively on parent
directories. We'd rather have git to fail rather than using
a random .git in an upper directory.

pkg/store/git/git.go

@@ -5,13 +5,14 @@
 // aren't pure Go either. So we need the git binary for now.
 
 // Package git makes a git repository out of a local directory, keeps the
-// content committed when the directory changes, and optionaly (if a remote
-// repos url is provided), keep it in sync with a remote repository.
+// content committed when the directory content changes, and optionaly (if
+// a remote repos url is provided), keep it in sync with a remote repository.
 package git
 
 import (
 	"context"
 	"fmt"
+	"os"
 	"os/exec"
 	"time"
 
@@ -24,6 +25,9 @@ import (
 var (
 	timeoutCommands = 60 * time.Second
 	checkInterval   = 10 * time.Second
+	gitAuthor       = "Katafygio"
+	gitEmail        = "katafygio@localhost"
+	gitMsg          = "Kubernetes cluster change"
 )
 
 var appFs = afero.NewOsFs()
@@ -47,9 +51,9 @@ func New(config *config.KfConfig) *Store {
 		Logger:   config.Logger,
 		URL:      config.GitURL,
 		LocalDir: config.LocalDir,
-		Author:   "Katafygio", // XXX should we expose a cli option for that?
-		Email:    "katafygio@localhost",
-		Msg:      "Kubernetes cluster change",
+		Author:   gitAuthor,
+		Email:    gitEmail,
+		Msg:      gitMsg,
 		DryRun:   config.DryRun,
 	}
 }
@@ -60,7 +64,7 @@ func (s *Store) Start() (*Store, error) {
 	s.stopch = make(chan struct{})
 	s.donech = make(chan struct{})
 
-	err := s.Clone()
+	err := s.CloneOrInit()
 	if err != nil {
 		return nil, err
 	}
@@ -101,6 +105,7 @@ func (s *Store) Git(args ...string) error {
 
 	cmd := exec.CommandContext(ctx, "git", args...) // #nosec
 	cmd.Dir = s.LocalDir
+	cmd.Env = append(os.Environ(), fmt.Sprintf("GIT_DIR=%s/.git", s.LocalDir))
 
 	out, err := cmd.CombinedOutput()
 	if err != nil {
@@ -121,6 +126,7 @@ func (s *Store) Status() (changed bool, err error) {
 
 	cmd := exec.CommandContext(ctx, "git", "status", "--porcelain") // #nosec
 	cmd.Dir = s.LocalDir
+	cmd.Env = append(os.Environ(), fmt.Sprintf("GIT_DIR=%s/.git", s.LocalDir))
 
 	out, err := cmd.CombinedOutput()
 	if err != nil {
@@ -134,8 +140,9 @@ func (s *Store) Status() (changed bool, err error) {
 	return false, nil
 }
 
-// Clone does git clone, or git init (when there's no GitURL to clone from)
-func (s *Store) Clone() (err error) {
+// CloneOrInit create a new local repository, either with "git clone" (if a GitURL
+// to clone from is provided), or "git init" (in the absence of GitURL).
+func (s *Store) CloneOrInit() (err error) {
 	if !s.DryRun {
 		err = appFs.MkdirAll(s.LocalDir, 0700)
 		if err != nil {

pkg/store/git/git_test.go

@@ -106,7 +106,7 @@ func TestGit(t *testing.T) {
 	repo.LocalDir = newdir
 	repo.URL = dir
 
-	err = repo.Clone()
+	err = repo.CloneOrInit()
 	if err != nil {
 		t.Errorf("clone failed: %v", err)
 	}