Graceful: Cancel Process on monitor pages & HammerTime (#9213)

* Graceful: Create callbacks to with contexts

* Graceful: Say when Gitea is completely finished

* Graceful: Git and Process within HammerTime

Force all git commands to terminate at HammerTime
Force all process commands to terminate at HammerTime
Move almost all git processes to run as git Commands

* Graceful: Always Hammer after Shutdown

* ProcessManager: Add cancel functionality

* Fix tests

* Make sure that process.Manager.Kill() cancels

* Make threadsafe access to Processes and remove own unused Kill

* Remove cmd from the process manager as it is no longer used

* the default context is the correct context

* get rid of double till

models/repo_generate.go

@@ -16,7 +16,6 @@ import (
 
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/util"
 
 	"github.com/gobwas/glob"
@@ -168,14 +167,11 @@ func generateRepoCommit(e Engine, repo, templateRepo, generateRepo *Repository,
 	}
 
 	repoPath := repo.repoPath(e)
-	_, stderr, err := process.GetManager().ExecDirEnv(
-		-1, tmpDir,
-		fmt.Sprintf("generateRepoCommit(git remote add): %s", repoPath),
-		env,
-		git.GitExecutable, "remote", "add", "origin", repoPath,
-	)
-	if err != nil {
-		return fmt.Errorf("git remote add: %v - %s", err, stderr)
+	if stdout, err := git.NewCommand("remote", "add", "origin", repoPath).
+		SetDescription(fmt.Sprintf("generateRepoCommit (git remote add): %s to %s", templateRepoPath, tmpDir)).
+		RunInDirWithEnv(tmpDir, env); err != nil {
+		log.Error("Unable to add %v as remote origin to temporary repo to %s: stdout %s\nError: %v", repo, tmpDir, stdout, err)
+		return fmt.Errorf("git remote add: %v", err)
 	}
 
 	return initRepoCommit(tmpDir, repo.Owner)