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package main
import (
"bufio"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"strings"
"syscall"
"text/template"
)
// ACTIVE_SITES_PATH is within /etc/nginx so we can mount /srv/nginx-conf as
// read-only
const (
NGINX_CONF_PATH = "/srv/nginx-conf"
SYSTEM_NGINX_CONF_PATH = "/etc/nginx"
ACTIVE_SITES_PATH = "/etc/nginx/sites-enabled"
)
type EnvMap map[string]string
func (m EnvMap) Get(key string) string {
if value, ok := m[key]; ok {
return value
} else {
return ""
}
}
func NewEnvMap() EnvMap {
envs := EnvMap{}
for _, env := range os.Environ() {
split := strings.SplitN(env, "=", 2)
if strings.HasPrefix(split[0], "NGINX_PP_") {
envs[split[0]] = split[1]
}
}
return envs
}
func processTemplate(filepath string) {
fp, err := os.Open(filepath)
if err != nil {
log.Printf("error: reading template file %s: %s", filepath, err)
return
}
defer fp.Close()
data, err := ioutil.ReadAll(fp)
if err != nil {
log.Printf("error: reading template file %s: %s", filepath, err)
return
}
t, err := template.New("tpl").Parse(string(data))
if err != nil {
log.Printf("error: processing template file %s: %s", filepath, err)
return
}
newPath := filepath[:len(filepath)-len(".tpl")]
fo, err := os.OpenFile(newPath, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
log.Printf("error: reading template file %s: %s", filepath, err)
return
}
defer fo.Close()
if err = t.Execute(fo, NewEnvMap()); err != nil {
log.Printf("error: processing template file %s: %s", filepath, err)
fo.Close()
_ = os.Remove(newPath)
return
}
log.Printf("processed template: %s", filepath)
}
func shouldIncludeFile(filepath string, info os.FileInfo) bool {
if info == nil {
return false
}
return !info.IsDir() && !strings.Contains(filepath, "/.git/") && info.Mode()&os.ModeType == 0
}
func shouldLinkForProfile(filepath, profile string) bool {
line := fmt.Sprintf("# preprocess: link_for %s", profile)
fp, err := os.Open(filepath)
if err != nil {
log.Printf("error: reading config file %s", filepath)
return false
}
defer fp.Close()
scanner := bufio.NewScanner(fp)
for scanner.Scan() {
if strings.TrimSpace(scanner.Text()) == line {
return true
}
}
return false
}
type LinkWalker struct {
ActiveSitesPath string
ActiveProfile string
}
func (w *LinkWalker) Walk(filepath string, info os.FileInfo, err error) error {
if !shouldIncludeFile(filepath, info) {
return nil
}
if shouldLinkForProfile(filepath, w.ActiveProfile) {
log.Printf("linking: %s", filepath)
out_path := path.Join(w.ActiveSitesPath, path.Base(filepath))
_ = os.Symlink(filepath, out_path)
}
if strings.HasSuffix(filepath, ".tpl") {
processTemplate(filepath)
}
return nil
}
func TemplateWalker(filepath string, info os.FileInfo, err error) error {
if !shouldIncludeFile(filepath, info) {
return nil
}
if strings.HasSuffix(filepath, ".tpl") {
processTemplate(filepath)
}
return nil
}
func cleanLinkFarm(linkFarm string) {
_ = os.RemoveAll(linkFarm)
_ = os.Mkdir(linkFarm, 0755)
}
func main() {
profile := os.Getenv("ACTIVE_PROFILE")
if profile == "" {
log.Fatalf("error: ACTIVE_PROFILE is not in environment")
}
cleanLinkFarm(ACTIVE_SITES_PATH)
filepath.Walk(NGINX_CONF_PATH, (&LinkWalker{ACTIVE_SITES_PATH, profile}).Walk)
filepath.Walk(SYSTEM_NGINX_CONF_PATH, TemplateWalker)
log.Printf("running: %s %+v", os.Args[1], os.Args[1:])
if err := syscall.Exec(os.Args[1], os.Args[1:], []string{}); err != nil {
log.Fatalf("error: exec failed %s", err)
}
}
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