cmd/packserver: add --index-file argument

cmd/packserver/go.mod

@@ -5,7 +5,7 @@ go 1.12
 require (
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/kisielk/errcheck v1.2.0 // indirect
-	github.com/lwithers/htpack v1.0.0
+	github.com/lwithers/htpack v1.1.0
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3 // indirect
 	golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a // indirect

cmd/packserver/go.sum

@@ -9,6 +9,8 @@ github.com/lwithers/htpack v0.0.0-20190412081623-ea77f42dc393 h1:h++VdZ2eeJC9hf+
 github.com/lwithers/htpack v0.0.0-20190412081623-ea77f42dc393/go.mod h1:+9noAoJ9IIiHkwn2Z2Po5upZOKItKKFgYr/cMESGYrc=
 github.com/lwithers/htpack v1.0.0 h1:opBavUAl6QKjvlxNaOwMAvO+Q+ytZpKSl0iDCYam1Uk=
 github.com/lwithers/htpack v1.0.0/go.mod h1:4dNHChTcK0SzOTVnFt4b0SuK7OMSo8Ge7o1XXYV4xUk=
+github.com/lwithers/htpack v1.1.0 h1:pURTwBKgcmLYpN8M+qT9/Ks2+kLy8cbQqgJZa6/QPaw=
+github.com/lwithers/htpack v1.1.0/go.mod h1:4dNHChTcK0SzOTVnFt4b0SuK7OMSo8Ge7o1XXYV4xUk=
 github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=

cmd/packserver/main.go

@@ -45,6 +45,8 @@ func main() {
 		"Extra headers; use flag once for each, in form -H header=value")
 	rootCmd.Flags().String("header-file", "",
 		"Path to text file containing one line for each header=value to add")
+	rootCmd.Flags().String("index-file", "",
+		"Name of index file (index.html or similar)")
 	rootCmd.Flags().Duration("expiry", 0,
 		"Tell client how long it can cache data for; 0 means no caching")
 
@@ -115,6 +117,13 @@ func run(c *cobra.Command, args []string) error {
 			fmt.Sprintf("public, max-age=%d", expiry/1e9))
 	}
 
+	// optional index file
+	//  NB: this is set below, as the handlers are instantiated
+	indexFile, err := c.Flags().GetString("index-file")
+	if err != nil {
+		return err
+	}
+
 	// verify .htpack specifications
 	if len(args) == 0 {
 		return errors.New("must specify one or more .htpack files")
@@ -141,15 +150,17 @@ func run(c *cobra.Command, args []string) error {
 
 	// load packfiles, registering handlers as we go
 	for prefix, packfile := range packPaths {
-		var handler http.Handler
+		packHandler, err := htpack.New(packfile)
-		handler, err = htpack.New(packfile)
 		if err != nil {
 			return err
 		}
+		if indexFile != "" {
+			packHandler.SetIndex(indexFile)
+		}
 
-		handler = &addHeaders{
+		handler := &addHeaders{
 			extraHeaders: extraHeaders,
-			handler:      handler,
+			handler:      packHandler,
 		}
 
 		if prefix != "/" {