Merge pull request #6 from Icinga/feature/env-config

entrypoint/: configure Icinga Web 2

entrypoint/go.mod

@@ -1,3 +1,9 @@
 module entrypoint
 
 go 1.14
+
+require (
+	github.com/go-ini/ini v1.57.0
+	github.com/smartystreets/goconvey v1.6.4 // indirect
+	gopkg.in/ini.v1 v1.57.0 // indirect
+)

entrypoint/go.sum

@@ -0,0 +1,17 @@
+github.com/go-ini/ini v1.57.0 h1:Qwzj3wZQW+Plax5Ntj+GYe07DfGj1OH+aL1nMTMaNow=
+github.com/go-ini/ini v1.57.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
+github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
+github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIKYqbNC9s=
+github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
+gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=

entrypoint/main.go

@@ -3,13 +3,22 @@ package main
 import (
 	"bufio"
 	"fmt"
+	"github.com/go-ini/ini"
+	"io/ioutil"
 	"os"
 	"os/exec"
+	"path"
 	"path/filepath"
+	"strings"
 	"syscall"
 	"time"
 )
 
+const confDir = "/data/etc/icingaweb2"
+const dirMode = 0750
+
+var enModsDir = path.Join(confDir, "enabledModules")
+
 func main() {
 	if err := entrypoint(); err != nil {
 		logf("crit", "%s", err.Error())
@@ -26,10 +35,103 @@ func entrypoint() error {
 	if os.Getpid() == 1 {
 		logf("info", "Initializing /data as we're the init process")
 
-		logf("debug", `Creating "/data/etc/icingaweb2"`)
-		if errMA := os.MkdirAll("/data/etc/icingaweb2", 0750); errMA != nil {
+		logf("debug", "Creating %#v", enModsDir)
+		if errMA := os.MkdirAll(enModsDir, dirMode); errMA != nil {
 			return errMA
 		}
+
+		logf("debug", "Translating env vars to .ini config")
+
+		cfgs := map[string]*ini.File{}
+		var enabledModules map[string]struct{} = nil
+
+	EnvVars:
+		for _, env := range os.Environ() {
+			if kv := strings.SplitN(env, "=", 2); len(kv) == 2 {
+				if strings.HasPrefix(kv[0], "icingaweb") {
+					if kv[0] = strings.TrimPrefix(kv[0], "icingaweb"); len(kv[0]) > 0 {
+						directive := strings.Split(kv[0][1:], kv[0][:1])
+						for _, component := range directive {
+							if component == "" {
+								continue EnvVars
+							}
+						}
+
+						if len(directive) == 1 {
+							if directive[0] == "enabledModules" {
+								if enabledModules == nil {
+									enabledModules = map[string]struct{}{}
+								}
+
+								for _, mod := range strings.Split(kv[1], ",") {
+									if mod = strings.TrimSpace(mod); mod != "" {
+										enabledModules[mod] = struct{}{}
+									}
+								}
+							}
+						} else if len(directive) >= 3 {
+							file := path.Join(directive[:len(directive)-2]...)
+							cfg, ok := cfgs[file]
+
+							if !ok {
+								cfg = ini.Empty()
+								cfgs[file] = cfg
+							}
+
+							_, errNK := cfg.Section(directive[len(directive)-2]).NewKey(
+								strings.ToLower(directive[len(directive)-1]), kv[1],
+							)
+							if errNK != nil {
+								return errNK
+							}
+						}
+					}
+				}
+			}
+		}
+
+		for file, cfg := range cfgs {
+			file = path.Join(confDir, file+".ini")
+			logf("trace1", "Writing %#v", file)
+
+			if errMA := os.MkdirAll(path.Dir(file), dirMode); errMA != nil {
+				return errMA
+			}
+
+			if errST := cfg.SaveTo(file); errST != nil {
+				return errST
+			}
+		}
+
+		if enabledModules != nil {
+			logf("debug", "Enabling/disabling modules")
+
+			mods, errRD := ioutil.ReadDir(enModsDir)
+			if errRD != nil {
+				return errRD
+			}
+
+			for _, mod := range mods {
+				mod := mod.Name()
+				if _, ok := enabledModules[mod]; ok {
+					delete(enabledModules, mod)
+				} else {
+					logf("trace1", "Disabling module %#v", mod)
+					if errRm := os.Remove(path.Join(enModsDir, mod)); errRm != nil {
+						return errRm
+					}
+				}
+			}
+
+			for mod := range enabledModules {
+				logf("trace1", "Enabling module %#v", mod)
+
+				errSl := os.Symlink(path.Join("/usr/share/icingaweb2/modules", mod), path.Join(enModsDir, mod))
+				if errSl != nil {
+					return errSl
+				}
+			}
+		}
 	}
 
 	path := os.Args[1]