Make Requests Processes and create process hierarchy. Associate OpenRepository with context. (#17125)

This PR registers requests with the process manager and manages hierarchy within the processes.

Git repos are then associated with a context, (usually the request's context) - with sub commands using this context as their base context.

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/git/repo_base_gogit.go

@@ -9,6 +9,7 @@
 package git
 
 import (
+	"context"
 	"errors"
 	"path/filepath"
 
@@ -30,10 +31,17 @@ type Repository struct {
 	gogitRepo    *gogit.Repository
 	gogitStorage *filesystem.Storage
 	gpgSettings  *GPGSettings
+
+	Ctx context.Context
 }
 
 // OpenRepository opens the repository at the given path.
 func OpenRepository(repoPath string) (*Repository, error) {
+	return OpenRepositoryCtx(DefaultContext, repoPath)
+}
+
+// OpenRepositoryCtx opens the repository at the given path within the context.Context
+func OpenRepositoryCtx(ctx context.Context, repoPath string) (*Repository, error) {
 	repoPath, err := filepath.Abs(repoPath)
 	if err != nil {
 		return nil, err
@@ -60,6 +68,7 @@ func OpenRepository(repoPath string) (*Repository, error) {
 		gogitRepo:    gogitRepo,
 		gogitStorage: storage,
 		tagCache:     newObjectCache(),
+		Ctx:          ctx,
 	}, nil
 }