add rogue env var collector

Signed-off-by: Christian Richter <crichter@owncloud.com>

docs/helpers/rogueEnv.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"gopkg.in/yaml.v2"
+)
+
+const yamlSource = "global_vars.yaml"
+
+type ConfigVars struct {
+	Variables []Variable `yaml:"variables"`
+}
+
+type Variable struct {
+	Name              string    `yaml:"name"`
+	Type              string    `yaml:"type"`
+	Default           string    `yaml:"default"`
+	Description       string    `yaml:"description"`
+	DependendServices []Service `yaml:"dependend_services"`
+	DoIgnore          bool      `yaml:"do_ignore"`
+}
+
+type Service struct {
+	Name string `yaml:"name"`
+	Path string `yaml:"path"`
+}
+
+func GetRogueEnvs() {
+	curdir, err := os.Getwd()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fullYamlPath := filepath.Join(curdir, yamlSource)
+	re := regexp.MustCompile(`"[A-z0-9_]{1,}"`)
+	vars := &ConfigVars{}
+	fmt.Printf("Reading existing variable definitions from %s\n", fullYamlPath)
+	yfile, err := ioutil.ReadFile(fullYamlPath)
+	if err == nil {
+		err := yaml.Unmarshal(yfile, &vars)
+		if err != nil {
+			log.Fatalf("could not unmarshall %s", fullYamlPath)
+		}
+	}
+
+	if err := os.Chdir("../../"); err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("Gathering variable definitions from source")
+	out, err := exec.Command("bash", "-c", "grep -R os.Getenv | grep -v rogue-env.go").Output()
+	if err != nil {
+		log.Fatal(err)
+	}
+	lines := strings.Split(string(out), "\n")
+	for _, l := range lines {
+		r := strings.SplitN(l, ":\t", 2)
+		if r[0] != "" && r[1] != "" {
+			res := re.FindAll([]byte(r[1]), -1)
+			for _, item := range res {
+				AddUniqueToStruct(vars, Variable{Name: strings.Trim(string(item), "\""), Type: ""})
+			}
+		}
+	}
+	output, err := yaml.Marshal(vars)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Writing new variable definitions to %s\n", fullYamlPath)
+	err = ioutil.WriteFile(fullYamlPath, output, 0666)
+	if err != nil {
+		log.Fatal("could not write %s", fullYamlPath)
+	}
+	if err := os.Chdir(curdir); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func AddUniqueToStruct(variables *ConfigVars, variable Variable) {
+	for _, itm := range variables.Variables {
+		if itm.Name == variable.Name {
+			return
+		}
+	}
+	variables.Variables = append(variables.Variables, variable)
+}