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

1 files changed, 22 insertions, 13 deletions

diff --git a/modules/graceful/manager_windows.go b/modules/graceful/manager_windows.go
index 925b1fc560..dd48a8d74c 100644
--- a/modules/graceful/manager_windows.go
+++ b/modules/graceful/manager_windows.go
@@ -8,6 +8,7 @@
 package graceful
 
 import (
+	"context"
 	"os"
 	"strconv"
 	"sync"
@@ -29,6 +30,7 @@ const (
 )
 
 type gracefulManager struct {
+	ctx                    context.Context
 	isChild                bool
 	lock                   *sync.RWMutex
 	state                  state
@@ -40,10 +42,11 @@ type gracefulManager struct {
 	terminateWaitGroup     sync.WaitGroup
 }
 
-func newGracefulManager() *gracefulManager {
+func newGracefulManager(ctx context.Context) *gracefulManager {
 	manager := &gracefulManager{
 		isChild: false,
 		lock:    &sync.RWMutex{},
+		ctx:     ctx,
 	}
 	manager.createServerWaitGroup.Add(numberOfServersToCreate)
 	manager.Run()
@@ -89,23 +92,29 @@ func (g *gracefulManager) Execute(args []string, changes <-chan svc.ChangeReques
 	waitTime := 30 * time.Second
 
 loop:
-	for change := range changes {
-		switch change.Cmd {
-		case svc.Interrogate:
-			status <- change.CurrentStatus
-		case svc.Stop, svc.Shutdown:
+	for {
+		select {
+		case <-g.ctx.Done():
 			g.doShutdown()
 			waitTime += setting.GracefulHammerTime
 			break loop
-		case hammerCode:
-			g.doShutdown()
-			g.doHammerTime(0 * time.Second)
-			break loop
-		default:
-			log.Debug("Unexpected control request: %v", change.Cmd)
+		case change := <-changes:
+			switch change.Cmd {
+			case svc.Interrogate:
+				status <- change.CurrentStatus
+			case svc.Stop, svc.Shutdown:
+				g.doShutdown()
+				waitTime += setting.GracefulHammerTime
+				break loop
+			case hammerCode:
+				g.doShutdown()
+				g.doHammerTime(0 * time.Second)
+				break loop
+			default:
+				log.Debug("Unexpected control request: %v", change.Cmd)
+			}
 		}
 	}
-
 	status <- svc.Status{
 		State:    svc.StopPending,
 		WaitHint: uint32(waitTime / time.Millisecond),