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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
"text/template"
"github.com/sirupsen/logrus"
"github.com/urfave/cli/v2"
)
var log = logrus.New()
// Some regexp defaults
const FileRe = ".+"
// NameRe must be less strict than e.g. NamespaceRe specially because of
// - non-namespaced like CRDs (they usually contain dots)
// - others like PSPs (containing `:`)
const NameRe = "^[^/ ]+$"
const KindRe = "^[0-9a-zA-Z]+$"
// NamespaceRe: empty or DNSre
const NamespaceRe = "^(|[a-z0-9]([-a-z0-9]*[a-z0-9])?)$"
// Flags defaults
var TemplateFlat = filepath.Join("{{.X.Outdir}}", "{{.Metadata.Name}}-{{.X.ShortKind}}.yaml")
var TemplateNS = filepath.Join("{{.X.Outdir}}", "{{.X.NS}}", "{{.Metadata.Name}}.{{.Kind}}.yaml")
// cli app flags
var appFlags = []cli.Flag{
&cli.StringFlag{
Name: "outdir",
Value: "generated",
Usage: "output dir",
},
&cli.StringFlag{
Name: "template_sel",
Value: "tpl_flat",
Usage: "pre-set template to use",
},
&cli.StringFlag{
Name: "tpl_flat",
Value: TemplateFlat,
Usage: "tpl_flat gotemplate (.X.Outdir is set to `outdir` flag)",
},
&cli.StringFlag{
Name: "tpl_ns",
Value: TemplateNS,
Usage: "tpl_ns gotemplate (.X.NS equals .Metadata.Namespace or '_no_ns_' if unset)",
},
&cli.StringFlag{
Name: "name_re",
Value: NameRe,
Usage: "Kubernetes API metadata.name to match",
},
&cli.StringFlag{
Name: "namespace_re",
Value: NamespaceRe,
Usage: "Kubernetes API metadata.namespace to match",
},
&cli.StringFlag{
Name: "kind_re",
Value: KindRe,
Usage: "Kubernetes API kind to match",
},
&cli.StringFlag{
Name: "file_re",
Value: FileRe,
Usage: "final output file regex to match",
},
&cli.StringFlag{
Name: "custom_sn_map",
Value: "",
TakesFile: true,
Usage: "Resource definitions short names custom map",
},
}
type Filters struct {
name string
namespace string
kind string
filename string
}
func main() {
app := cli.NewApp()
app.Name = "kubernetes-split-yaml"
app.Usage = "Split the 'giant yaml file' into one file pr kubernetes resource"
app.Flags = appFlags
app.Action = func(c *cli.Context) error {
outdir := c.String("outdir")
templateSel := c.String("template_sel")
outfileTemplate := c.String(templateSel)
filters := &Filters{
name: c.String("name_re"),
namespace: c.String("namespace_re"),
kind: c.String("kind_re"),
filename: c.String("file_re"),
}
customShortnameMapFilePath := c.String("custom_sn_map")
handleFile(c.Args().Get(0), outdir, outfileTemplate, customShortnameMapFilePath, filters)
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatalf("Error running: %v", err)
}
}
func outFile(outdir string, t *template.Template, filters *Filters, m *KubernetesAPI, shortnameMap shortNameMap) (string, error) {
ns := m.Metadata.Namespace
if ns == "" {
ns = "_no_ns_"
}
// Setup m.X. "extended" template-convienent fields
m.X.Outdir = outdir
m.X.NS = ns
m.X.ShortKind = getShortName(m.Kind, shortnameMap)
buf := new(bytes.Buffer)
err := t.Execute(buf, m)
if err != nil {
return "", fmt.Errorf("Failed to template.Execute on %v, verify template string", m)
}
filename := buf.String()
regexps := []struct {
str string
match string
warn bool
}{
// Note: we still keep the KindRe, NameRe, NamespaceRe default REs
// for *sanity* verification, to avoid tricks like setting namespace to
// "../../etc"
{str: m.Kind, match: KindRe, warn: true},
{str: m.Kind, match: filters.kind},
{str: m.Metadata.Name, match: NameRe, warn: true},
{str: m.Metadata.Name, match: filters.name},
{str: m.Metadata.Namespace, match: NamespaceRe, warn: true},
{str: m.Metadata.Namespace, match: filters.namespace},
{str: filename, match: filters.filename},
}
for _, re := range regexps {
matched, err := regexp.Match(re.match, []byte(re.str))
if err != nil {
log.Fatalf("Failed to match regexp '%s'", re.match)
}
if !matched {
if re.warn {
log.Warnf("Skipped suspicious object with kind='%s' namespace='%s' name='%s'",
m.Kind, m.Metadata.Namespace, m.Metadata.Name)
}
return "", nil
}
}
return filename, nil
}
func handleFile(file, outdir, outfileTemplate, customShortnameMapFilePath string, filters *Filters) {
tpl, err := template.New("outfile").Parse(outfileTemplate)
if err != nil {
log.Fatalf("Failed create template from '%s'", outfileTemplate)
}
var shortNameMap shortNameMap
if customShortnameMapFilePath != "" {
shortNameMap, err = loadCustomShortnameMapFile(customShortnameMapFilePath)
if err != nil {
log.Fatalf("Failed to load custom shortname map file '%s': %v", customShortnameMapFilePath, err)
}
}
files := readAndSplitFile(file)
for _, fileContent := range files {
m, err := getYamlInfo(fileContent)
if err != nil {
log.Warnf("Ignoring %v", err)
continue
}
filename, err := outFile(outdir, tpl, filters, m, shortNameMap)
if err != nil {
log.Fatalf("Failed on outFile: %v", err)
}
if filename == "" {
continue
}
log.Infof("Creating file: %s", filename)
fileDir := filepath.Dir(filename)
err = os.MkdirAll(fileDir, os.ModePerm)
if err != nil {
log.Fatalf("Failed to create directory '%s'", fileDir)
}
err = ioutil.WriteFile(filename, []byte(fileContent), os.ModePerm)
if err != nil {
log.Fatalf("Failed creating file %s : %v", filename, err)
}
}
}
func readAndSplitFile(file string) []string {
var fileContent []byte
if file == "-" {
c, err := ioutil.ReadAll(os.Stdin)
fileContent = c
if err != nil {
log.Fatalf("Failed reading from stdin: %v", err)
}
} else {
c, err := ioutil.ReadFile(file)
fileContent = c
if err != nil {
log.Fatalf("Failed reading file %s : %v", file, err)
}
}
docs := strings.Split(string(fileContent), "\n---")
res := []string{}
// Trim whitespace in both ends of each yaml docs.
// - Re-add a single newline last
for _, doc := range docs {
content := strings.TrimSpace(doc)
// Ignore empty docs
if content != "" {
res = append(res, content+LineBreak)
}
}
return res
}