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tetragon-oci-hook-setup: crio.conf annotations
Add a command to patch crio.conf to add allowed annotations. For example: $ ssh cat /etc/crio/crio.conf > crio.conf $ ./tetragon-oci-hook-setup patch-crio-conf enable-annotations --config-file=crio.conf --output-file crio-patched.conf --annotations='io.kubernetes.cri-o.cgroup2-mount-hierarchy-rw' $ diff -u crio.conf crio-patched.conf --- crio.conf 2024-11-29 10:47:11.622015385 +0100 +++ crio-patched.conf 2024-11-29 11:03:39.856306109 +0100 @@ -300,6 +300,7 @@ runtime_path = "/usr/bin/runc" runtime_type = "oci" runtime_root = "/run/runc" +allowed_annotations = ["io.kubernetes.cri-o.cgroup2-mount-hierarchy-rw"] Signed-off-by: Kornilios Kourtis <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // Copyright Authors of Tetragon | ||
|
|
||
| package main | ||
|
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||
| import ( | ||
| "fmt" | ||
| "log/slog" | ||
| "os" | ||
| "strings" | ||
|
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| "github.com/pelletier/go-toml" | ||
| tomlparser "github.com/pelletier/go-toml/v2/unstable" | ||
| ) | ||
|
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| type patchCrioConf struct { | ||
| EnableAnnotations enableAnnotations `cmd:"" help:"enable annotations"` | ||
| } | ||
|
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| type enableAnnotations struct { | ||
| ConfFile string `name:"config-file" default:"/etc/crio/crio.conf" help:"crio configuration file location (input) (${default}))"` | ||
| Outfile string `name:"output-file" default:"" help:"output file location"` | ||
| Annotations []string `name:"annotations"` | ||
| } | ||
|
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| func doEnableAnnotations(log *slog.Logger, c *enableAnnotations) ([]addLine, error) { | ||
| data, err := os.ReadFile(c.ConfFile) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| p := tomlparser.Parser{ | ||
| KeepComments: true, | ||
| } | ||
| p.Reset(data) | ||
|
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| lines := []addLine{} | ||
| insideRuntime := false | ||
| var annotationsLoc tomlparser.Shape | ||
| for p.NextExpression() { | ||
| e := p.Expression() | ||
| switch insideRuntime { | ||
| case false: | ||
| if e.Kind == tomlparser.Table { | ||
| c := e.Child() | ||
| if c == nil || c.Kind != tomlparser.Key || string(c.Data) != "crio" { | ||
| continue | ||
| } | ||
| c = c.Next() | ||
| if c == nil || c.Kind != tomlparser.Key || string(c.Data) != "runtime" { | ||
| continue | ||
| } | ||
| c = c.Next() | ||
| if c == nil || c.Kind != tomlparser.Key || string(c.Data) != "runtimes" { | ||
| continue | ||
| } | ||
| c = c.Next() | ||
| if c == nil || c.Kind != tomlparser.Key { | ||
| continue | ||
| } | ||
| insideRuntime = true | ||
| } | ||
| case true: | ||
| foundAnnotations := false | ||
| done := false | ||
| annotations := []string{} | ||
| if e.Kind == tomlparser.KeyValue { | ||
| var array *tomlparser.Node | ||
| for c := e.Child(); c != nil; c = c.Next() { | ||
| annotationsLoc = p.Shape(c.Raw) | ||
| if c.Kind == tomlparser.Key && string(c.Data) == "allowed_annotations" { | ||
| foundAnnotations = true | ||
| } else if c.Kind == tomlparser.Array { | ||
| array = c | ||
| } | ||
|
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| if foundAnnotations && array != nil { | ||
| for cc := array.Child(); cc != nil; cc = cc.Next() { | ||
| if cc.Kind == tomlparser.String { | ||
| annotations = append(annotations, string(cc.Data)) | ||
| } | ||
| } | ||
| break | ||
| } | ||
| } | ||
|
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| } else { | ||
| done = true | ||
| } | ||
|
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| if foundAnnotations || done { | ||
| annotations = append(annotations, c.Annotations...) | ||
| qannotations := make([]string, 0, len(annotations)) | ||
| for _, a := range annotations { | ||
| qannotations = append(qannotations, fmt.Sprintf("%q", a)) | ||
| } | ||
| insideRuntime = false | ||
| lines = append(lines, addLine{ | ||
| pos: toml.Position{Col: annotationsLoc.Start.Column, Line: annotationsLoc.Start.Line}, | ||
| line: fmt.Sprintf("allowed_annotations = [%s]", strings.Join(qannotations, ", ")), | ||
| replaceLine: foundAnnotations, | ||
| }) | ||
| } | ||
| } | ||
| } | ||
|
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| return lines, nil | ||
|
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| } | ||
|
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| func (c *enableAnnotations) Run(log *slog.Logger) error { | ||
|
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| changes, err := doEnableAnnotations(log, c) | ||
| if len(changes) == 0 { | ||
| log.Info("nothing to do") | ||
| return nil | ||
| } | ||
|
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| outFname := c.Outfile | ||
| if outFname == "" { | ||
| f, err := os.CreateTemp("", "crio.*.conf") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| outFname = f.Name() | ||
| f.Close() | ||
| } | ||
|
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| err = applyChanges(c.ConfFile, outFname, changes) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| log.Info("written output", "filename", outFname) | ||
| return nil | ||
|
|
||
| } |
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