Bundle static resources with Go binaries

This utility bundles a set of files into a virtual file system that can be compiled directly into a Go binary.

Installation

First, get the command-line tool:

go get github.com/alecthomas/gobundle \
    github.com/alecthomas/gobundle/gobundle

Usage

Generating a bundle

Generate a bundle from all files under /usr/share/doc/nasm:

gobundle --recursive --compress --uncompress_on_init --package=mybundle \
    --target=/tmp/gobundle.go --exclude='.git/*' .

This will generate a file something like this:

package mybundle

import (
    "github.com/alecthomas/gobundle"
)

var MybundleBundle *gobundle.Bundle = gobundle.NewBuilder("mybundle").Compressed().UncompressOnInit().Add(
    "README.md", "x\xdaL\x91\xb1\xae\xdb...
).Add(
    "gobundle/main.go", "x\u0694W[o\xdb\...
).Add(
    "gobundle.go", "x\xda\xccVMo\x9b@\x1...
).Build()

Accessing a bundle

The bundle can then be accessed either directly via the generated exported variable mybundle.MybundleBundle:

bundle := mybundle.MybundleBundle

Or via the global registry (which can also be used to iterate over all bundles):

bundle := gobundle.Bundles.Bundle("mybundle")

Once you have a bundle you can traverse the files in the bundle, retrieve the raw bytes for a file, or open a file as an io.Reader:

for _, name := range bundle.Files() {
    r, _ := bundle.Open(name)
    b, _ := ioutil.ReadAll(r)
    fmt.Printf("file %s has length %d\n", name, len(b))
}