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Adds support for running OCI hooks within the guest. A 'drop-in' path (guest_hook_path) is specified in the cli configuration file and if set, the agent will look for OCI hooks in this directory and inject them into the container life cycle. Fixes: kata-containers#348 Replaces: kata-containers#365 Co-authored-by: Edward Guzman <eguzman@nvidia.com> Co-authored-by: Felix Abecassis <fabecassis@nvidia.com> Signed-off-by: Edward Guzman <eguzman@nvidia.com> Signed-off-by: Felix Abecassis <fabecassis@nvidia.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // | ||
| // Copyright (c) 2018 NVIDIA CORPORATION | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "io/ioutil" | ||
| "os" | ||
| "path" | ||
| "path/filepath" | ||
|
|
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| "github.com/opencontainers/runtime-spec/specs-go" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
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| // OCI config file | ||
| const ( | ||
| ociConfigFile string = "config.json" | ||
| ociConfigFileMode os.FileMode = 0444 | ||
| ) | ||
|
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| // writeSpecToFile writes the container's OCI spec to "dirname(spec.Root.Path)/config.json" | ||
| // This effectively makes the parent directory a valid OCI bundle. | ||
| func writeSpecToFile(spec *specs.Spec) error { | ||
| bundlePath := filepath.Dir(spec.Root.Path) | ||
| configPath := filepath.Join(bundlePath, ociConfigFile) | ||
| f, err := os.OpenFile(configPath, os.O_WRONLY|os.O_CREATE, ociConfigFileMode) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer f.Close() | ||
|
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| return json.NewEncoder(f).Encode(spec) | ||
| } | ||
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| // changeToBundlePath changes the cwd to the OCI bundle path defined as | ||
| // dirname(spec.Root.Path) and returns the old cwd. | ||
| func changeToBundlePath(spec *specs.Spec) (string, error) { | ||
| cwd, err := os.Getwd() | ||
| if err != nil { | ||
| return cwd, err | ||
| } | ||
|
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| if spec == nil || spec.Root == nil || spec.Root.Path == "" { | ||
| return cwd, errors.New("invalid OCI spec") | ||
| } | ||
|
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| bundlePath := filepath.Dir(spec.Root.Path) | ||
| configPath := filepath.Join(bundlePath, ociConfigFile) | ||
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| // Verify that config.json is present at the root of the bundle path. | ||
| if _, err := os.Stat(configPath); err != nil { | ||
| return cwd, errors.New("invalid OCI bundle") | ||
| } | ||
|
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| return cwd, os.Chdir(bundlePath) | ||
| } | ||
|
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| func isValidHook(file os.FileInfo) (bool, error) { | ||
| if file.IsDir() { | ||
| return false, errors.New("is a directory") | ||
| } | ||
|
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| mode := file.Mode() | ||
| if (mode & os.ModeSymlink) != 0 { | ||
| return false, errors.New("is a symbolic link") | ||
| } | ||
|
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| perm := mode & os.ModePerm | ||
| if (perm & 0111) == 0 { | ||
| return false, errors.New("is not executable") | ||
| } | ||
|
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| return true, nil | ||
| } | ||
|
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| // findHooks searches guestHookPath for any OCI hooks for a given hookType | ||
| func findHooks(guestHookPath, hookType string) (hooksFound []specs.Hook) { | ||
| hooksPath := path.Join(guestHookPath, hookType) | ||
|
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| files, err := ioutil.ReadDir(hooksPath) | ||
| if err != nil { | ||
| agentLog.WithError(err).WithField("oci-hook-type", hookType).Info("Skipping hook type") | ||
| return | ||
| } | ||
|
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| for _, file := range files { | ||
| name := file.Name() | ||
| if ok, err := isValidHook(file); !ok { | ||
| agentLog.WithError(err).WithField("oci-hook-name", name).Warn("Skipping hook") | ||
| continue | ||
| } | ||
|
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| agentLog.WithFields(logrus.Fields{ | ||
| "oci-hook-name": name, | ||
| "oci-hook-type": hookType, | ||
| }).Info("Adding hook") | ||
| hooksFound = append(hooksFound, specs.Hook{ | ||
| Path: path.Join(hooksPath, name), | ||
| Args: []string{name, hookType}, | ||
| }) | ||
| } | ||
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| agentLog.WithField("oci-hook-type", hookType).Infof("Added %d hooks", len(hooksFound)) | ||
|
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| return | ||
| } |
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