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main.go
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main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"gopkg.in/yaml.v3"
"helm.sh/helm/v3/pkg/action"
"helm.sh/helm/v3/pkg/chart"
"helm.sh/helm/v3/pkg/chart/loader"
"helm.sh/helm/v3/pkg/chartutil"
"helm.sh/helm/v3/pkg/engine"
)
func main() {
flagInputChart := flag.String("chart", "sample-helm-charts/nginx", "Helm Chart to process. Submit .tgz or folder name.")
flagOutputFile := flag.Bool("o", false, "Write Helm Chart tree to helm-decomposer-output.md. (default \"false\")")
flagGenerateJson := flag.Bool("ij", false, "Write image list to images.json. (default \"false\")")
flagGenerateYaml := flag.Bool("iy", false, "Write image list to images.yaml. (default \"false\")")
flag.Parse()
fmt.Printf("\nLoading Helm Chart \"%s\"...\n", *flagInputChart)
loadedChart, err := loader.Load(*flagInputChart)
if err != nil {
panic(err)
}
releaseOptions := chartutil.ReleaseOptions{Name: "release1", Namespace: "ns1"}
vals, err := chartutil.ToRenderValues(loadedChart, map[string]interface{}{},
releaseOptions, chartutil.DefaultCapabilities)
// engine.Render can not work with Helm aliases directly.
// Must be preceeded by Run method to compose umbrella Chart Type.
actionConfig := new(action.Configuration)
client := action.NewInstall(actionConfig)
client.ClientOnly = true
client.Namespace = "ns1"
client.ReleaseName = "release1"
client.DryRun = true
rel, err := client.Run(loadedChart, vals)
if err != nil {
panic(err)
}
// Rendering Umbrella Helm Chart to m (map[string]string) where KEY is the filenames and VALUE is the file contents
m, err := engine.Render(rel.Chart, vals) // rel.Chart equals fully to loadedChart. Both can be used
if err != nil {
log.Println(err)
fmt.Println("\nWARNING: Helm Chart can not be fully templated. Please check values files on all levels, usage of aliases, etc...")
}
// generate json from the list of images obtained from DetectImages
if *flagGenerateJson {
// use uniqueImageList from images.go to generate JSON & YAML
uniqueImageList := detectImages(m)
imageDict := map[string][]string{"images": uniqueImageList}
fmt.Printf("\n--- Generating image list as JSON ---")
// write to file images.json
jsonFile, err := os.Create("images.json")
if err != nil {
fmt.Println(err)
return
}
defer jsonFile.Close()
encoder := json.NewEncoder(jsonFile)
err = encoder.Encode(imageDict)
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("\n--- File saved to images.json ---")
}
// generate Yaml from the list of images obtained from DetectImages
if *flagGenerateYaml {
// use uniqueImageList from images.go to generate JSON & YAML
uniqueImageList := detectImages(m)
imageDict := map[string][]string{"images": uniqueImageList}
fmt.Printf("\n--- Generating image list as YAML ---")
// write to file images.yaml
yamlFile, err := os.Create("images.yaml")
if err != nil {
fmt.Println(err)
return
}
defer yamlFile.Close()
encoder := yaml.NewEncoder(yamlFile)
err = encoder.Encode(imageDict)
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("\n--- File saved to images.yaml ---")
}
fmt.Printf("\n--- Building Tree for the Helm Chart \"%s\" ---\n\n", loadedChart.Name())
// Closure must be declared to allow recursions later on
var depRecursion func(myChart chart.Chart, nodeID int) tree
// allNodeIDs initialized already to reserve 0 for root node. Needed by vis() in tree.go
// Slice keys act as Node IDs. Values are always "dummy". Length represents Node count.
allNodeIDs := []string{"node"} // 0: node, 1: node,...
fullTree := tree{{label: loadedChart.Name(), children: []int{}}}
var currentDepsNodeIDs []int
depRecursion = func(myChart chart.Chart, nodeID int) tree {
parent := myChart.Name()
chartDeps := myChart.Dependencies()
currentDepsNodeIDs = nil
// fmt.Printf("\n=== Parent chart: %s contains %d dependencies. === \n", parent, len(chartDeps))
// fmt.Println("Tree state:", fullTree)
// Chart does not have further deps
if len(chartDeps) == 0 {
// fmt.Println("No dependencies found. Continuing...")
} else {
// root Node already declared, i.e. len(allNodeIDs) == 1. Child Node IDs are shifted.
shift := len(allNodeIDs)
for i, dep := range chartDeps {
// Node ID == allNodeIDs's KEY IDs.
// currentDepsNodeIDs's VALUES are shifted +1 to continue after allNodeIDs keys
currentDepsNodeIDs = append(currentDepsNodeIDs, shift+i) // [1,2,3,4], for the next parent: [5,6,7]...
// allNodeIDs keys grows with every new dependencies. "node" is just a dummy value. Keys matter.
allNodeIDs = append(allNodeIDs, "node")
// fmt.Printf("New Node \"%s\" (Node ID: %d) added to the Tree. Current Node count: %d \n", dep.Name(), shift+i, len(allNodeIDs))
fullTree = append(fullTree, node{label: dep.Name(), children: []int{}})
}
// fmt.Printf("New Tree state: %v \n", fullTree)
fullTree[nodeID] = node{label: parent, children: currentDepsNodeIDs}
// fmt.Printf("Childrens in Tree updated for Node \"%s\" (Node ID %d): %v \n", parent, nodeID, fullTree)
for i, dep := range chartDeps {
// fmt.Printf("Recursive search for: \"%s\", Node ID: %d\n", dep.Name(), shift+i)
depRecursion(*dep, shift+i)
}
}
return fullTree
}
depRecursion(*loadedChart, 0)
if *flagOutputFile {
f, err := os.Create("helm-decomposer-output.md")
if err != nil {
log.Fatal(err)
}
defer f.Close()
rescueStdout := os.Stdout
r, w, _ := os.Pipe()
os.Stdout = w
// Capturing this at stdout
vis(fullTree)
w.Close()
out, _ := ioutil.ReadAll(r)
os.Stdout = rescueStdout
f.Write(out)
// Print captured
fmt.Printf("%s", out)
} else {
vis(fullTree)
}
}