podman

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//go:build !remote
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package libpod
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import (
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	"fmt"
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	"os"
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	"path/filepath"
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	"strconv"
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	"syscall"
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	"github.com/containers/podman/v5/libpod/define"
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	"github.com/containers/podman/v5/pkg/rootless"
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	"github.com/containers/podman/v5/pkg/util"
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	"github.com/sirupsen/logrus"
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)
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func (r *Runtime) stopPauseProcess() error {
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	if rootless.IsRootless() {
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		pausePidPath, err := util.GetRootlessPauseProcessPidPath()
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		if err != nil {
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			return fmt.Errorf("could not get pause process pid file path: %w", err)
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		}
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		data, err := os.ReadFile(pausePidPath)
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		if err != nil {
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			if os.IsNotExist(err) {
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				return nil
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			}
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			return fmt.Errorf("cannot read pause process pid file: %w", err)
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		}
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		pausePid, err := strconv.Atoi(string(data))
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		if err != nil {
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			return fmt.Errorf("cannot parse pause pid file %s: %w", pausePidPath, err)
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		}
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		if err := os.Remove(pausePidPath); err != nil {
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			return fmt.Errorf("cannot delete pause pid file %s: %w", pausePidPath, err)
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		}
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		if err := syscall.Kill(pausePid, syscall.SIGKILL); err != nil {
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			return err
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		}
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	}
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	return nil
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}
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// Migrate stops the rootless pause process and performs any necessary database
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// migrations that are required. It can also migrate all containers to a new OCI
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// runtime, if requested.
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func (r *Runtime) Migrate(newRuntime string) error {
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	// Acquire the alive lock and hold it.
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	// Ensures that we don't let other Podman commands run while we are
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	// rewriting things in the DB.
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	aliveLock, err := r.getRuntimeAliveLock()
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	if err != nil {
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		return fmt.Errorf("retrieving alive lock: %w", err)
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	}
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	aliveLock.Lock()
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	defer aliveLock.Unlock()
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	if !r.valid {
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		return define.ErrRuntimeStopped
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	}
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	runningContainers, err := r.GetRunningContainers()
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	if err != nil {
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		return err
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	}
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	allCtrs, err := r.state.AllContainers(false)
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	if err != nil {
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		return err
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	}
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	logrus.Infof("Stopping all containers")
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	for _, ctr := range runningContainers {
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		fmt.Printf("stopped %s\n", ctr.ID())
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		if err := ctr.Stop(); err != nil {
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			return fmt.Errorf("cannot stop container %s: %w", ctr.ID(), err)
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		}
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	}
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	// Did the user request a new runtime?
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	runtimeChangeRequested := newRuntime != ""
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	var requestedRuntime OCIRuntime
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	if runtimeChangeRequested {
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		runtime, exists := r.ociRuntimes[newRuntime]
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		if !exists {
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			return fmt.Errorf("change to runtime %q requested but no such runtime is defined: %w", newRuntime, define.ErrInvalidArg)
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		}
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		requestedRuntime = runtime
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	}
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	for _, ctr := range allCtrs {
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		needsWrite := false
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		// Reset pause process location
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		oldLocation := filepath.Join(ctr.state.RunDir, "conmon.pid")
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		if ctr.config.ConmonPidFile == oldLocation {
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			logrus.Infof("Changing conmon PID file for %s", ctr.ID())
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			ctr.config.ConmonPidFile = filepath.Join(ctr.config.StaticDir, "conmon.pid")
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			needsWrite = true
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		}
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		// Reset runtime
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		if runtimeChangeRequested && ctr.config.OCIRuntime != newRuntime {
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			logrus.Infof("Resetting container %s runtime to runtime %s", ctr.ID(), newRuntime)
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			ctr.config.OCIRuntime = newRuntime
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			ctr.ociRuntime = requestedRuntime
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			needsWrite = true
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		}
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		if needsWrite {
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			if err := r.state.RewriteContainerConfig(ctr, ctr.config); err != nil {
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				return fmt.Errorf("rewriting config for container %s: %w", ctr.ID(), err)
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			}
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		}
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	}
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	return r.stopPauseProcess()
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}
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