Add webbundle implementation

Makefile

@@ -16,6 +16,19 @@ $(shell mkdir -p tools/bin )
 
 AGOLA_TAGS = sqlite_unlock_notify
 
+AGOLA_WEBBUNDLE_DEPS = webbundle/bindata.go
+AGOLA_WEBBUNDLE_TAGS = webbundle
+
+ifdef WEBBUNDLE
+
+ifndef WEBDISTPATH
+$(error WEBDISTPATH must be provided when building the webbundle)
+endif
+
+AGOLA_DEPS = $(AGOLA_WEBBUNDLE_DEPS)
+AGOLA_TAGS += $(AGOLA_WEBBUNDLE_TAGS)
+endif
+
 .PHONY: all
 all: build
 
@@ -28,7 +41,7 @@ test: tools/bin/gocovmerge
 
 # don't use existing file names and track go sources, let's do this to the go tool
 .PHONY: bin/agola
-bin/agola:
+bin/agola: $(AGOLA_DEPS)
 	GO111MODULE=on go build $(if $(AGOLA_TAGS),-tags "$(AGOLA_TAGS)") -ldflags $(LD_FLAGS) -o $(PROJDIR)/bin/agola $(REPO_PATH)/cmd/agola
 
 # toolbox MUST be statically compiled so it can be used in any image for that arch
@@ -37,6 +50,13 @@ bin/agola:
 bin/agola-toolbox: 
 	CGO_ENABLED=0 GO111MODULE=on go build $(if $(AGOLA_TAGS),-tags "$(AGOLA_TAGS)") -ldflags $(LD_FLAGS) -o $(PROJDIR)/bin/agola-toolbox $(REPO_PATH)/cmd/toolbox
 
+.PHONY: tools/bin/go-bindata
+tools/bin/go-bindata:
+	GOBIN=$(PROJDIR)/tools/bin go install github.com/go-bindata/go-bindata/go-bindata
+
 .PHONY: tools/bin/gocovmerge
 tools/bin/gocovmerge:
 	GOBIN=$(PROJDIR)/tools/bin go install github.com/wadey/gocovmerge
+
+webbundle/bindata.go: tools/bin/go-bindata $(WEBDISTPATH)
+	./tools/bin/go-bindata -o webbundle/bindata.go -tags webbundle -pkg webbundle -prefix "$(WEBDISTPATH)" -nocompress=true "$(WEBDISTPATH)/..."

webbundle/emptybindata.go

@@ -0,0 +1,58 @@
+// Copyright 2019 Sorint.lab
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !webbundle
+
+package webbundle
+
+import (
+	"fmt"
+	"os"
+)
+
+// Asset loads and returns the asset for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func Asset(name string) ([]byte, error) {
+	return nil, fmt.Errorf("Asset %s not found", name)
+}
+
+// AssetInfo loads and returns the asset info for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func AssetInfo(name string) (os.FileInfo, error) {
+	return nil, fmt.Errorf("AssetInfo %s not found", name)
+}
+
+// AssetNames returns the names of the assets.
+func AssetNames() []string {
+	return []string{}
+}
+
+// AssetDir returns the file names below a certain
+// directory embedded in the file by go-bindata.
+// For example if you run go-bindata on data/... and data contains the
+// following hierarchy:
+//     data/
+//       foo.txt
+//       img/
+//         a.png
+//         b.png
+// then AssetDir("data") would return []string{"foo.txt", "img"}
+// AssetDir("data/img") would return []string{"a.png", "b.png"}
+// AssetDir("foo.txt") and AssetDir("notexist") would return an error
+// AssetDir("") will return []string{"data"}.
+func AssetDir(name string) ([]string, error) {
+	return []string{}, nil
+}