diff options
| -rw-r--r-- | libpod/runtime.go | 2 | ||||
| -rw-r--r-- | pkg/domain/infra/abi/system.go | 44 | ||||
| -rw-r--r-- | utils/utils.go | 47 | ||||
| -rw-r--r-- | utils/utils_supported.go | 6 |
4 files changed, 54 insertions, 45 deletions
diff --git a/libpod/runtime.go b/libpod/runtime.go index 761fa08a2..c22d87324 100644 --- a/libpod/runtime.go +++ b/libpod/runtime.go @@ -34,6 +34,7 @@ import ( "github.com/containers/podman/v3/pkg/rootless" "github.com/containers/podman/v3/pkg/systemd" "github.com/containers/podman/v3/pkg/util" + "github.com/containers/podman/v3/utils" "github.com/containers/storage" "github.com/containers/storage/pkg/unshare" "github.com/cri-o/ocicni/pkg/ocicni" @@ -540,6 +541,7 @@ func makeRuntime(ctx context.Context, runtime *Runtime) (retErr error) { return err } if became { + utils.MovePauseProcessToScope(pausePid) os.Exit(ret) } } diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go index bc98edd06..e326f26a8 100644 --- a/pkg/domain/infra/abi/system.go +++ b/pkg/domain/infra/abi/system.go @@ -3,16 +3,12 @@ package abi import ( "context" "fmt" - "io/ioutil" "net/url" "os" "os/exec" "path/filepath" - "strconv" - "strings" "github.com/containers/common/pkg/config" - "github.com/containers/podman/v3/libpod" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/pkg/cgroups" "github.com/containers/podman/v3/pkg/domain/entities" @@ -72,11 +68,7 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool) if err != nil { return err } - - initCommand, err := ioutil.ReadFile("/proc/1/comm") - // On errors, default to systemd - runsUnderSystemd := err != nil || strings.TrimRight(string(initCommand), "\n") == "systemd" - + runsUnderSystemd := utils.RunsOnSystemd() unitName := fmt.Sprintf("podman-%d.scope", os.Getpid()) if runsUnderSystemd || conf.Engine.CgroupManager == config.SystemdCgroupsManager { if err := utils.RunUnderSystemdScope(os.Getpid(), "user.slice", unitName); err != nil { @@ -120,18 +112,7 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool) } became, ret, err = rootless.TryJoinFromFilePaths(pausePidPath, true, paths) - - if err := movePauseProcessToScope(ic.Libpod); err != nil { - conf, err2 := ic.Config(context.Background()) - if err2 != nil { - return err - } - if conf.Engine.CgroupManager == config.SystemdCgroupsManager { - logrus.Warnf("Failed to add pause process to systemd sandbox cgroup: %v", err) - } else { - logrus.Debugf("Failed to add pause process to systemd sandbox cgroup: %v", err) - } - } + utils.MovePauseProcessToScope(pausePidPath) if err != nil { logrus.Error(errors.Wrapf(err, "invalid internal status, try resetting the pause process with %q", os.Args[0]+" system migrate")) os.Exit(1) @@ -142,27 +123,6 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool) return nil } -func movePauseProcessToScope(r *libpod.Runtime) error { - tmpDir, err := r.TmpDir() - if err != nil { - return err - } - pausePidPath, err := util.GetRootlessPauseProcessPidPathGivenDir(tmpDir) - if err != nil { - return errors.Wrapf(err, "could not get pause process pid file path") - } - data, err := ioutil.ReadFile(pausePidPath) - if err != nil { - return errors.Wrapf(err, "cannot read pause pid file") - } - pid, err := strconv.ParseUint(string(data), 10, 0) - if err != nil { - return errors.Wrapf(err, "cannot parse pid file %s", pausePidPath) - } - - return utils.RunUnderSystemdScope(int(pid), "user.slice", "podman-pause.scope") -} - // SystemPrune removes unused data from the system. Pruning pods, containers, volumes and images. func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.SystemPruneOptions) (*entities.SystemPruneReport, error) { var systemPruneReport = new(entities.SystemPruneReport) diff --git a/utils/utils.go b/utils/utils.go index 2e415130e..b08630d2f 100644 --- a/utils/utils.go +++ b/utils/utils.go @@ -4,12 +4,15 @@ import ( "bytes" "fmt" "io" + "io/ioutil" "os" "os/exec" "strconv" "strings" + "sync" "github.com/containers/podman/v3/libpod/define" + "github.com/containers/podman/v3/pkg/cgroups" "github.com/containers/storage/pkg/archive" "github.com/pkg/errors" "github.com/sirupsen/logrus" @@ -155,3 +158,47 @@ func RemoveScientificNotationFromFloat(x float64) (float64, error) { } return result, nil } + +var ( + runsOnSystemdOnce sync.Once + runsOnSystemd bool +) + +// RunsOnSystemd returns whether the system is using systemd +func RunsOnSystemd() bool { + runsOnSystemdOnce.Do(func() { + initCommand, err := ioutil.ReadFile("/proc/1/comm") + // On errors, default to systemd + runsOnSystemd = err != nil || strings.TrimRight(string(initCommand), "\n") == "systemd" + }) + return runsOnSystemd +} + +func moveProcessToScope(pidPath, slice, scope string) error { + data, err := ioutil.ReadFile(pidPath) + if err != nil { + return errors.Wrapf(err, "cannot read pid file %s", pidPath) + } + pid, err := strconv.ParseUint(string(data), 10, 0) + if err != nil { + return errors.Wrapf(err, "cannot parse pid file %s", pidPath) + } + return RunUnderSystemdScope(int(pid), slice, scope) +} + +// MovePauseProcessToScope moves the pause process used for rootless mode to keep the namespaces alive to +// a separate scope. +func MovePauseProcessToScope(pausePidPath string) { + err := moveProcessToScope(pausePidPath, "user.slice", "podman-pause.scope") + if err != nil { + unified, err := cgroups.IsCgroup2UnifiedMode() + if err != nil { + logrus.Warnf("Failed to detect if running with cgroup unified: %v", err) + } + if RunsOnSystemd() && unified { + logrus.Warnf("Failed to add pause process to systemd sandbox cgroup: %v", err) + } else { + logrus.Debugf("Failed to add pause process to systemd sandbox cgroup: %v", err) + } + } +} diff --git a/utils/utils_supported.go b/utils/utils_supported.go index ebc870d26..1404e3194 100644 --- a/utils/utils_supported.go +++ b/utils/utils_supported.go @@ -47,10 +47,10 @@ func RunUnderSystemdScope(pid int, slice string, unitName string) error { // On errors check if the cgroup already exists, if it does move the process there if props, err := conn.GetUnitTypeProperties(unitName, "Scope"); err == nil { if cgroup, ok := props["ControlGroup"].(string); ok && cgroup != "" { - if err := moveUnderCgroup(cgroup, "", []uint32{uint32(pid)}); err != nil { - return err + if err := moveUnderCgroup(cgroup, "", []uint32{uint32(pid)}); err == nil { + return nil } - return nil + // On errors return the original error message we got from StartTransientUnit. } } return err |