put templates in /app, force docroot opt to be provided

Dockerfile.fileviewer

@@ -5,8 +5,11 @@ RUN apk add --no-cache ca-certificates bind-tools tini
 # We copy from the locally built zoekt image
 COPY --from=zoekt /usr/local/bin/zoekt-fileviewer /usr/local/bin/
 
+# Create the /app directory
+RUN mkdir -p /app
+
 # Copy the templates folder
-COPY cmd/zoekt-fileviewer/templates /usr/local/bin/templates
+COPY cmd/zoekt-fileviewer/templates /app/templates
 
 # zoekt-webserver has a large stable heap size (10s of gigs), and as such the
 # default GOGC=100 could be better tuned. https://dave.cheney.net/tag/gogc

cmd/zoekt-fileviewer/main.go

@@ -20,6 +20,7 @@ import (
 var (
 	zoektRepoCache = flag.String("zoekt-repo-cache", "", "path to zoekt bare git repos")
 	listen         = flag.String("listen", ":8080", "listen on this address.")
+	docRoot        = flag.String("doc-root", "", "where to find runtime files")
 )
 
 const (
@@ -40,11 +41,14 @@ func main() {
 	if *zoektRepoCache == "" {
 		log.Fatal("--zoekt-repo-cache is required")
 	}
+	if *docRoot == "" {
+		log.Fatal("--doc-root is required")
+	}
 
 	// Create server configuration
 	cfg := &config{
 		ZoektRepoCache: *zoektRepoCache,
-		DocRoot:        ".",
+		DocRoot:        *docRoot,
 		ReadTimeout:    30 * time.Second,
 		WriteTimeout:   30 * time.Second,
 		Port:           *listen,

cmd/zoekt-fileviewer/template.go

@@ -458,7 +458,6 @@ func getFuncs() map[string]interface{} {
 }
 
 func LoadTemplates(base string, templates map[string]*template.Template) error {
-	log.Printf("in LoadTemplates\n")
 	pattern := base + "/templates/common/*.html"
 	common := template.New("").Funcs(getFuncs())
 	common = template.Must(common.ParseGlob(pattern))