fix: builder and sdk changes (#81)

## Description

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At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-authored-by: marcel.henselin <marcel.henselin@stackit.cloud>
Reviewed-on: #81

generator/cmd/build/functions.go

@@ -0,0 +1,120 @@
+package build
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"os/exec"
+	"strings"
+	"text/template"
+)
+
+func FileExists(pathValue string) bool {
+	_, err := os.Stat(pathValue)
+	if os.IsNotExist(err) {
+		return false
+	}
+	if err != nil {
+		panic(err)
+	}
+	return true
+}
+
+func ucfirst(s string) string {
+	if s == "" {
+		return ""
+	}
+	return strings.ToUpper(s[:1]) + s[1:]
+}
+
+func writeTemplateToFile(tplName, tplFile, outFile string, data *templateData) error {
+	fn := template.FuncMap{
+		"ucfirst": ucfirst,
+	}
+
+	tmpl, err := template.New(tplName).Funcs(fn).ParseFiles(tplFile)
+	if err != nil {
+		return err
+	}
+
+	var f *os.File
+	f, err = os.Create(outFile)
+	if err != nil {
+		return err
+	}
+
+	err = tmpl.Execute(f, *data)
+	if err != nil {
+		return err
+	}
+
+	err = f.Close()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+/* saved for later
+func deleteFiles(fNames ...string) error {
+	for _, fName := range fNames {
+		if _, err := os.Stat(fName); !os.IsNotExist(err) {
+			err = os.Remove(fName)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func copyFile(src, dst string) (int64, error) {
+	sourceFileStat, err := os.Stat(src)
+	if err != nil {
+		return 0, err
+	}
+
+	if !sourceFileStat.Mode().IsRegular() {
+		return 0, fmt.Errorf("%s is not a regular file", src)
+	}
+
+	source, err := os.Open(src)
+	if err != nil {
+		return 0, err
+	}
+	defer func(source *os.File) {
+		err := source.Close()
+		if err != nil {
+			slog.Error("copyFile", "err", err)
+		}
+	}(source)
+
+	destination, err := os.Create(dst)
+	if err != nil {
+		return 0, err
+	}
+	defer func(destination *os.File) {
+		err := destination.Close()
+		if err != nil {
+			slog.Error("copyFile", "err", err)
+		}
+	}(destination)
+	nBytes, err := io.Copy(destination, source)
+	return nBytes, err
+}
+*/
+
+func checkCommands(commands []string) error {
+	for _, commandName := range commands {
+		if !commandExists(commandName) {
+			return fmt.Errorf("missing command %s", commandName)
+		}
+		slog.Info("        found", "command", commandName)
+	}
+	return nil
+}
+
+func commandExists(cmd string) bool {
+	_, err := exec.LookPath(cmd)
+	return err == nil
+}