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108 lines
2.6 KiB
108 lines
2.6 KiB
package main
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import (
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"log"
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"strings"
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"github.com/ghodss/yaml"
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"k8s.io/helm/pkg/proto/hapi/release"
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)
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// hookAnno is the label name for a hook
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const hookAnno = "helm.sh/hook"
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const (
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preInstall = "pre-install"
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postInstall = "post-install"
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preDelete = "pre-delete"
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postDelete = "post-delete"
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preUpgrade = "pre-upgrade"
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postUpgrade = "post-upgrade"
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)
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var events = map[string]release.Hook_Event{
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preInstall: release.Hook_PRE_INSTALL,
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postInstall: release.Hook_POST_INSTALL,
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preDelete: release.Hook_PRE_DELETE,
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postDelete: release.Hook_POST_DELETE,
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preUpgrade: release.Hook_PRE_UPGRADE,
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postUpgrade: release.Hook_POST_UPGRADE,
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}
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type simpleHead struct {
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Kind string `json:"kind,omitempty"`
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Metadata *struct {
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Name string `json:"name"`
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Annotations map[string]string `json:"annotations"`
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} `json:"metadata,omitempty"`
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}
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// sortHooks takes a map of filename/YAML contents and sorts them into hook types.
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//
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// The resulting hooks struct will be populated with all of the generated hooks.
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// Any file that does not declare one of the hook types will be placed in the
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// 'generic' bucket.
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//
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// To determine hook type, this looks for a YAML structure like this:
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//
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// kind: SomeKind
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// metadata:
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// annotations:
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// helm.sh/hook: pre-install
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//
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// Where HOOK_NAME is one of the known hooks.
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//
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// If a file declares more than one hook, it will be copied into all of the applicable
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// hook buckets. (Note: label keys are not unique within the labels section).
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//
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// Files that do not parse into the expected format are simply placed into a map and
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// returned.
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func sortHooks(files map[string]string) (hs []*release.Hook, generic map[string]string) {
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hs = []*release.Hook{}
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generic = map[string]string{}
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for n, c := range files {
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var sh simpleHead
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err := yaml.Unmarshal([]byte(c), &sh)
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if err != nil {
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log.Printf("YAML parse error on %s: %s (skipping)", n, err)
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}
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if sh.Metadata == nil || sh.Metadata.Annotations == nil || len(sh.Metadata.Annotations) == 0 {
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generic[n] = c
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continue
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}
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hookTypes, ok := sh.Metadata.Annotations[hookAnno]
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if !ok {
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generic[n] = c
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continue
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}
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h := &release.Hook{
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Name: sh.Metadata.Name,
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Kind: sh.Kind,
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Path: n,
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Manifest: c,
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Events: []release.Hook_Event{},
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}
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isHook := false
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for _, hookType := range strings.Split(hookTypes, ",") {
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hookType = strings.ToLower(strings.TrimSpace(hookType))
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e, ok := events[hookType]
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if ok {
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isHook = true
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h.Events = append(h.Events, e)
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}
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}
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if !isHook {
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log.Printf("info: skipping unknown hook: %q", hookTypes)
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continue
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}
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hs = append(hs, h)
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}
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return
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}
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