Add Close() method to gogitRepository (#8901) (#8958)

Backport #8901 - Adjusted slightly for 1.9

In investigating #7947 it has become clear that the storage component of go-git repositories needs closing.

This PR adds this Close function and adds the Close functions as necessary.

In TransferOwnership the ctx.Repo.GitRepo is closed if it is open to help prevent the risk of multiple open files.

Fixes #7947

routers/repo/wiki.go

@@ -144,6 +144,7 @@ func renderWikiPage(ctx *context.Context, isViewPage bool) (*git.Repository, *gi
 				if models.IsErrWikiInvalidFileName(err) {
 					continue
 				}
+				wikiRepo.Close()
 				ctx.ServerError("WikiFilenameToName", err)
 				return nil, nil
 			} else if wikiName == "_Sidebar" || wikiName == "_Footer" {
@@ -171,14 +172,19 @@ func renderWikiPage(ctx *context.Context, isViewPage bool) (*git.Repository, *gi
 	pageFilename := models.WikiNameToFilename(pageName)
 	var entry *git.TreeEntry
 	if entry, err = findEntryForFile(commit, pageFilename); err != nil {
+		wikiRepo.Close()
 		ctx.ServerError("findEntryForFile", err)
 		return nil, nil
 	} else if entry == nil {
+		wikiRepo.Close()
 		ctx.Redirect(ctx.Repo.RepoLink + "/wiki/_pages")
 		return nil, nil
 	}
 	data := wikiContentsByEntry(ctx, entry)
 	if ctx.Written() {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
 		return nil, nil
 	}
 
@@ -223,8 +229,16 @@ func Wiki(ctx *context.Context) {
 
 	wikiRepo, entry := renderWikiPage(ctx, true)
 	if ctx.Written() {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
 		return
 	}
+	defer func() {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
+	}()
 	if entry == nil {
 		ctx.Data["Title"] = ctx.Tr("repo.wiki")
 		ctx.HTML(200, tplWikiStart)
@@ -260,11 +274,18 @@ func WikiPages(ctx *context.Context) {
 
 	wikiRepo, commit, err := findWikiRepoCommit(ctx)
 	if err != nil {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
 		return
 	}
 
 	entries, err := commit.ListEntries()
 	if err != nil {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
+
 		ctx.ServerError("ListEntries", err)
 		return
 	}
@@ -275,6 +296,10 @@ func WikiPages(ctx *context.Context) {
 		}
 		c, err := wikiRepo.GetCommitByPath(entry.Name())
 		if err != nil {
+			if wikiRepo != nil {
+				wikiRepo.Close()
+			}
+
 			ctx.ServerError("GetCommit", err)
 			return
 		}
@@ -283,6 +308,10 @@ func WikiPages(ctx *context.Context) {
 			if models.IsErrWikiInvalidFileName(err) {
 				continue
 			}
+			if wikiRepo != nil {
+				wikiRepo.Close()
+			}
+
 			ctx.ServerError("WikiFilenameToName", err)
 			return
 		}
@@ -294,6 +323,11 @@ func WikiPages(ctx *context.Context) {
 	}
 	ctx.Data["Pages"] = pages
 
+	defer func() {
+		if wikiRepo != nil {
+			wikiRepo.Close()
+		}
+	}()
 	ctx.HTML(200, tplWikiPages)
 }
 
@@ -305,6 +339,9 @@ func WikiRaw(ctx *context.Context) {
 			return
 		}
 	}
+	defer func() {
+		wikiRepo.Close()
+	}()
 
 	providedPath := ctx.Params("*")