assets: move away from gx

1. Use a submodule for dir-index-html. This isn't a go dependency and treating
   it like one is more trouble than it's worth. We don't actually need to
   checkout the submodule unless we need to regenerate the assets.
2. Avoid a runtime dependency on dir-index-html (may shave a few bytes off the
   final binary?).
3. Remove unused code.
4. Avoid bundling unused files.
5. Switch to a maintained version of go-bindata.
6. Use go mod to manage go-bindata.

.gitmodules

+[submodule "assets/dir-index-html"]
+	path = assets/dir-index-html
+	url = git@github.com:ipfs/dir-index-html

assets/README.md

@@ -8,6 +8,5 @@ Instead, edit the source files and use `go generate` from within the
 assets directory:
 
 ```
-go get -u github.com/jteeuwen/go-bindata/...
-go generate
+go generate .
 ```

assets/assets.go

-//go:generate go-bindata -pkg=assets -prefix=$GOPATH/src/gx/ipfs/QmT1jwrqzSMjSjLG5oBd9w4P9vXPKQksWuf5ghsE3Q88ZV init-doc $GOPATH/src/gx/ipfs/QmT1jwrqzSMjSjLG5oBd9w4P9vXPKQksWuf5ghsE3Q88ZV/dir-index-html
+//go:generate git submodule update --init ./dir-index-html
+//go:generate go run github.com/go-bindata/go-bindata/go-bindata -pkg=assets init-doc dir-index-html/dir-index.html dir-index-html/knownIcons.txt
 //go:generate gofmt -w bindata.go
-
 package assets
 
 import (
 	"fmt"
-	"os"
 	"path/filepath"
 
 	"github.com/ipfs/go-ipfs/core"
@@ -15,9 +14,6 @@ import (
 	files "github.com/ipfs/go-ipfs-files"
 	options "github.com/ipfs/interface-go-ipfs-core/options"
 	"github.com/ipfs/interface-go-ipfs-core/path"
-
-	// this import keeps gx from thinking the dep isn't used
-	_ "github.com/ipfs/dir-index-html"
 )
 
 // initDocPaths lists the paths for the docs we want to seed during --init
@@ -36,16 +32,6 @@ func SeedInitDocs(nd *core.IpfsNode) (cid.Cid, error) {
 	return addAssetList(nd, initDocPaths)
 }
 
-var initDirPath = filepath.Join(os.Getenv("GOPATH"), "gx", "ipfs", "QmT1jwrqzSMjSjLG5oBd9w4P9vXPKQksWuf5ghsE3Q88ZV", "dir-index-html")
-var initDirIndex = []string{
-	filepath.Join(initDirPath, "knownIcons.txt"),
-	filepath.Join(initDirPath, "dir-index.html"),
-}
-
-func SeedInitDirIndex(nd *core.IpfsNode) (cid.Cid, error) {
-	return addAssetList(nd, initDirIndex)
-}
-
 func addAssetList(nd *core.IpfsNode, l []string) (cid.Cid, error) {
 	api, err := coreapi.NewCoreAPI(nd)
 	if err != nil {

assets/assets_test.go

@@ -12,14 +12,6 @@ func TestEmbeddedDocs(t *testing.T) {
 	testNFiles(initDocPaths, 5, t, "documents")
 }
 
-func TestDirIndex(t *testing.T) {
-	t.Skip("skipping for now, code being tested is currently unused")
-	// TODO: import assets during init.
-	// this will require figuring out how to set the right paths up for
-	// referencing the code from its gx path
-	testNFiles(initDirIndex, 2, t, "assets")
-}
-
 func testNFiles(fs []string, wantCnt int, t *testing.T, ftype string) {
 	if len(fs) < wantCnt {
 		t.Fatalf("expected %d %s. got %d", wantCnt, ftype, len(fs))

assets/bindata_dep.go

+//+build never,!never
+
+package assets
+
+import (
+	// Make sure go mod tracks these deps but avoid including them in the
+	// actual build.
+	_ "github.com/go-bindata/go-bindata"
+)

dir-index-html @ a2330df8

+Subproject commit a2330df84015a301d77df89af4cb49f2817f2063

go.mod

@@ -11,12 +11,12 @@ require (
 	github.com/elgris/jsondiff v0.0.0-20160530203242-765b5c24c302
 	github.com/fatih/color v1.7.0 // indirect
 	github.com/fsnotify/fsnotify v1.4.7
+	github.com/go-bindata/go-bindata v3.1.1+incompatible
 	github.com/go-critic/go-critic v0.0.0-20181204210945-ee9bf5809ead // indirect
 	github.com/gogo/protobuf v1.2.1
 	github.com/golangci/golangci-lint v1.16.1-0.20190425135923-692dacb773b7
 	github.com/hashicorp/go-multierror v1.0.0
 	github.com/hashicorp/golang-lru v0.5.1
-	github.com/ipfs/dir-index-html v1.0.3
 	github.com/ipfs/go-bitswap v0.1.1
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-blockservice v0.1.0

go.sum

@@ -74,6 +74,8 @@ github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fd/go-nat v1.0.0/go.mod h1:BTBu/CKvMmOMUPkKVef1pngt2WFH/lg7E6yQnulfp6E=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/go-bindata/go-bindata v3.1.1+incompatible h1:tR4f0e4VTO7LK6B2YWyAoVEzG9ByG1wrXB4TL9+jiYg=
+github.com/go-bindata/go-bindata v3.1.1+incompatible/go.mod h1:xK8Dsgwmeed+BBsSy2XTopBn/8uK2HWuGSnA11C3Joo=
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127 h1:0gkP6mzaMqkmpcJYCFOLkIBwI7xFExG03bbkOkCvUPI=
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
 github.com/go-critic/go-critic v0.0.0-20181204210945-c3db6069acc5/go.mod h1:Jc75BZJv2dNy7opKH6bF29VveDQHfGZ6Asn/3phBesg=
@@ -185,8 +187,6 @@ github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NH
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/ipfs/bbloom v0.0.1 h1:s7KkiBPfxCeDVo47KySjK0ACPc5GJRUxFpdyWEuDjhw=
 github.com/ipfs/bbloom v0.0.1/go.mod h1:oqo8CVWsJFMOZqTglBG4wydCE4IQA/G2/SEofB0rjUI=
-github.com/ipfs/dir-index-html v1.0.3 h1:cKdOjJBKJgewgcv97zOlqsNOle52N91d3nAkbQadnuY=
-github.com/ipfs/dir-index-html v1.0.3/go.mod h1:TG9zbaH/+4MnkGel0xF4SLNhk+YZvBNo6jjBkO/LaWc=
 github.com/ipfs/go-bitswap v0.0.3/go.mod h1:jadAZYsP/tcRMl47ZhFxhaNuDQoXawT8iHMg+iFoQbg=
 github.com/ipfs/go-bitswap v0.0.9/go.mod h1:kAPf5qgn2W2DrgAcscZ3HrM9qh4pH+X8Fkk3UPrwvis=
 github.com/ipfs/go-bitswap v0.1.0 h1:28YsHYw9ut6wootnImPXH0WpnU5Dbo3qm6cvQ6e6wYY=