|
| 1 | +/* |
| 2 | + Copyright The containerd Authors. |
| 3 | +
|
| 4 | + Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + you may not use this file except in compliance with the License. |
| 6 | + You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | + Unless required by applicable law or agreed to in writing, software |
| 11 | + distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + See the License for the specific language governing permissions and |
| 14 | + limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package v2 |
| 18 | + |
| 19 | +import ( |
| 20 | + "context" |
| 21 | + "os" |
| 22 | + "path/filepath" |
| 23 | + |
| 24 | + "github.com/containerd/containerd/containers" |
| 25 | + "github.com/containerd/containerd/events/exchange" |
| 26 | + "github.com/containerd/containerd/log" |
| 27 | + "github.com/containerd/containerd/mount" |
| 28 | + "github.com/containerd/containerd/namespaces" |
| 29 | + "github.com/containerd/containerd/plugin" |
| 30 | + "github.com/containerd/containerd/runtime" |
| 31 | +) |
| 32 | + |
| 33 | +func loadExistingTasks(ic *plugin.InitContext, list *runtime.TaskList, events *exchange.Exchange, containers containers.Store) error { |
| 34 | + var ( |
| 35 | + ctx = ic.Context |
| 36 | + state = ic.State |
| 37 | + root = ic.Root |
| 38 | + containerdAddress = ic.Address |
| 39 | + containerdTTRPCAddress = ic.TTRPCAddress |
| 40 | + ) |
| 41 | + |
| 42 | + nsDirs, err := os.ReadDir(state) |
| 43 | + if err != nil { |
| 44 | + return err |
| 45 | + } |
| 46 | + for _, nsd := range nsDirs { |
| 47 | + if !nsd.IsDir() { |
| 48 | + continue |
| 49 | + } |
| 50 | + ns := nsd.Name() |
| 51 | + // skip hidden directories |
| 52 | + if len(ns) > 0 && ns[0] == '.' { |
| 53 | + continue |
| 54 | + } |
| 55 | + log.G(ctx).WithField("namespace", ns).Debug("loading tasks in namespace") |
| 56 | + if err := loadShims(namespaces.WithNamespace(ctx, ns), state, list, events, containers, containerdAddress, containerdTTRPCAddress); err != nil { |
| 57 | + log.G(ctx).WithField("namespace", ns).WithError(err).Error("loading tasks in namespace") |
| 58 | + continue |
| 59 | + } |
| 60 | + if err := cleanupWorkDirs(namespaces.WithNamespace(ctx, ns), root, list); err != nil { |
| 61 | + log.G(ctx).WithField("namespace", ns).WithError(err).Error("cleanup working directory in namespace") |
| 62 | + continue |
| 63 | + } |
| 64 | + } |
| 65 | + |
| 66 | + return nil |
| 67 | +} |
| 68 | + |
| 69 | +func loadShims(ctx context.Context, state string, list *runtime.TaskList, events *exchange.Exchange, containers containers.Store, containerdAddress string, containerdTTRPCAddress string) error { |
| 70 | + ns, err := namespaces.NamespaceRequired(ctx) |
| 71 | + if err != nil { |
| 72 | + return err |
| 73 | + } |
| 74 | + shimDirs, err := os.ReadDir(filepath.Join(state, ns)) |
| 75 | + if err != nil { |
| 76 | + return err |
| 77 | + } |
| 78 | + for _, sd := range shimDirs { |
| 79 | + if !sd.IsDir() { |
| 80 | + continue |
| 81 | + } |
| 82 | + id := sd.Name() |
| 83 | + // skip hidden directories |
| 84 | + if len(id) > 0 && id[0] == '.' { |
| 85 | + continue |
| 86 | + } |
| 87 | + bundle, err := LoadBundle(ctx, state, id) |
| 88 | + if err != nil { |
| 89 | + // fine to return error here, it is a programmer error if the context |
| 90 | + // does not have a namespace |
| 91 | + return err |
| 92 | + } |
| 93 | + // fast path |
| 94 | + bf, err := os.ReadDir(bundle.Path) |
| 95 | + if err != nil { |
| 96 | + bundle.Delete() |
| 97 | + log.G(ctx).WithError(err).Errorf("fast path read bundle path for %s", bundle.Path) |
| 98 | + continue |
| 99 | + } |
| 100 | + if len(bf) == 0 { |
| 101 | + bundle.Delete() |
| 102 | + continue |
| 103 | + } |
| 104 | + container, err := containers.Get(ctx, id) |
| 105 | + if err != nil { |
| 106 | + log.G(ctx).WithError(err).Errorf("loading container %s", id) |
| 107 | + if err := mount.UnmountAll(filepath.Join(bundle.Path, "rootfs"), 0); err != nil { |
| 108 | + log.G(ctx).WithError(err).Errorf("forceful unmount of rootfs %s", id) |
| 109 | + } |
| 110 | + bundle.Delete() |
| 111 | + continue |
| 112 | + } |
| 113 | + binaryCall := shimBinary(bundle, container.Runtime.Name, containerdAddress, containerdTTRPCAddress) |
| 114 | + shim, err := loadShim(ctx, bundle, func() { |
| 115 | + log.G(ctx).WithField("id", id).Info("shim disconnected") |
| 116 | + |
| 117 | + cleanupAfterDeadShim(context.Background(), id, ns, list, events, binaryCall) |
| 118 | + // Remove self from the runtime task list. |
| 119 | + list.Delete(ctx, id) |
| 120 | + }) |
| 121 | + if err != nil { |
| 122 | + cleanupAfterDeadShim(ctx, id, ns, list, events, binaryCall) |
| 123 | + continue |
| 124 | + } |
| 125 | + list.Add(ctx, shim) |
| 126 | + } |
| 127 | + return nil |
| 128 | +} |
| 129 | + |
| 130 | +func cleanupWorkDirs(ctx context.Context, root string, list *runtime.TaskList) error { |
| 131 | + ns, err := namespaces.NamespaceRequired(ctx) |
| 132 | + if err != nil { |
| 133 | + return err |
| 134 | + } |
| 135 | + dirs, err := os.ReadDir(filepath.Join(root, ns)) |
| 136 | + if err != nil { |
| 137 | + return err |
| 138 | + } |
| 139 | + for _, d := range dirs { |
| 140 | + // if the task was not loaded, cleanup and empty working directory |
| 141 | + // this can happen on a reboot where /run for the bundle state is cleaned up |
| 142 | + // but that persistent working dir is left |
| 143 | + if _, err := list.Get(ctx, d.Name()); err != nil { |
| 144 | + path := filepath.Join(root, ns, d.Name()) |
| 145 | + if err := os.RemoveAll(path); err != nil { |
| 146 | + log.G(ctx).WithError(err).Errorf("cleanup working dir %s", path) |
| 147 | + } |
| 148 | + } |
| 149 | + } |
| 150 | + return nil |
| 151 | +} |
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