diff --git a/Dockerfile b/Dockerfile
new file mode 100755
index 0000000..25eb6eb
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,13 @@
+FROM frolvlad/alpine-glibc:alpine-3.9_glibc-2.29
+RUN apk update && apk add --no-cache ca-certificates
+
+RUN mkdir -p /var/log
+WORKDIR /main
+
+COPY . .
+
+ENV GOPATH=""
+ENV MNT="/mnt/"
+ENTRYPOINT ["/main/exec-youtuber"]
+CMD []
+
diff --git a/config/config.go b/config/config.go
old mode 100644
new mode 100755
index 736c228..4be805c
--- a/config/config.go
+++ b/config/config.go
@@ -1,10 +1,19 @@
 package config
 
+import "os"
+
 var (
-	Feed = "https://www.youtube.com/feeds/videos.xml?channel_id=UCwX0AEx-qIhQ9kgtlNhyIXw"
-	Root = "/tmp"
+	Feed = orEnv("FEED", "https://www.youtube.com/feeds/videos.xml?channel_id=UCwX0AEx-qIhQ9kgtlNhyIXw")
+	Root = orEnv("ROOT", "/tmp")
 )
 
+func orEnv(k, v string) string {
+	if w, ok := os.LookupEnv(k); ok {
+		return w
+	}
+	return v
+}
+
 /*
 config = {
    "path"      :  "../TV/Shepherds_Chapel"   ,
diff --git a/feed/feed.go b/feed/feed.go
old mode 100644
new mode 100755
diff --git a/feed/item.go b/feed/item.go
old mode 100644
new mode 100755
diff --git a/main.go b/main.go
old mode 100644
new mode 100755
index 1df4fa8..a025170
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"local/youtuber/config"
 	"local/youtuber/feed"
@@ -9,19 +10,32 @@ import (
 	"os"
 	"path"
 	"strings"
+	"time"
 )
 
 func main() {
 	os.Setenv("LC_ALL", "C.UTF-8")
-	results, err := feed.Fetch(config.Feed)
+	client, err := youtubedl.New()
 	if err != nil {
 		panic(err)
 	}
-	log.Println(results)
+	interval := time.Hour * 4
+	for true {
+		err := do(client)
+		if err != nil {
+			log.Println(err)
+		}
+		log.Printf("sleeping until %v", time.Now().Add(interval))
+		time.Sleep(interval)
+	}
+}
 
-	youtubedl, err := youtubedl.New()
+func do(client *youtubedl.Client) error {
+	errs := ""
+
+	results, err := feed.Fetch(config.Feed)
 	if err != nil {
-		panic(err)
+		return err
 	}
 
 	for _, result := range results {
@@ -32,10 +46,17 @@ func main() {
 			result.Date.Day(),
 			strings.Join(strings.Split(result.Title, " ")[2:], "_"),
 		)
-		if err := youtubedl.Download(result.Link, path.Join(config.Root, target)); err != nil {
-			panic(err)
+		target = path.Join(config.Root, target)
+		if _, err := os.Stat(strings.ReplaceAll(target, "%(ext)s", "mp4")); !os.IsNotExist(err) {
+			log.Printf("already exists: %s", target)
+			continue
+		}
+		if err := client.Download(result.Link, path.Join(config.Root, target)); err != nil {
+			errs += ", " + err.Error()
 		}
-		return
 	}
-	log.Println(youtubedl)
+	if errs != "" {
+		return errors.New(errs)
+	}
+	return nil
 }
diff --git a/youtubedl/client.go b/youtubedl/client.go
old mode 100644
new mode 100755
diff --git a/youtubedl/install.go b/youtubedl/install.go
old mode 100644
new mode 100755
index 2d87ea5..52ea35c
--- a/youtubedl/install.go
+++ b/youtubedl/install.go
@@ -2,6 +2,7 @@ package youtubedl
 
 import (
 	"errors"
+	"log"
 	"os/exec"
 )
 
@@ -31,11 +32,15 @@ func installPyPip3() error {
 		[]string{"apt", "install", "python3", "pip3"},
 		[]string{"apk", "add", "python3", "py3-pip"},
 		[]string{"sudo", "apk", "add", "python3", "py3-pip"},
+		[]string{"/sbin/apk", "add", "python3", "py3-pip"},
+		[]string{"sudo", "/sbin/apk", "add", "python3", "py3-pip"},
 	} {
 		cmd := exec.Command(combo[0], combo[1:]...)
-		if err := cmd.Run(); err == nil {
+		err := cmd.Run()
+		if err == nil {
 			return nil
 		}
+		log.Println("%v: %v", err, combo)
 	}
 	return errors.New("cannot get python3 and pip3")
 }