func archive(fs testfs.FileSystem) (out []byte, err error) {
buf := new(bytes.Buffer)
t := tar.NewWriter(buf)
origDir, err := fs.Getwd()
if err != nil {
return
}
// Start at the root of the fs
fs.Chdir("/")
err = walk(fs, t)
if err != nil {
return
}
err = fs.Chdir(origDir)
if err != nil {
return
}
err = t.Close()
return buf.Bytes(), err
}
func walk(fs testfs.FileSystem, t *tar.Writer) (err error) {
cwd, err := fs.Getwd()
if err != nil {
return
}
f, err := fs.OpenFile(cwd, os.O_RDONLY, 0)
if err != nil {
return
}
fi, err := f.Readdir(-1)
if err != nil {
return
}
for _, file := range fi {
// Add a new file to the archive
var hdr *tar.Header
hdr, err = tarHdr(file)
if err != nil {
return
}
// Make header name fully qualified
if cwd[len(cwd)-1] == '/' {
hdr.Name = cwd + hdr.Name
} else {
hdr.Name = cwd + "/" + hdr.Name
}
// Strip leading slashes
if hdr.Name[0] == '/' {
hdr.Name = hdr.Name[1:]
}
err = t.WriteHeader(hdr)
if err != nil {
return
}
// Write the file data to the archive
if !file.IsDir() && file.Size() > 0 {
var target testfs.File
target, err = fs.Open(file.Name())
if err != nil {
return
}
_, err = io.Copy(t, target)
if err != nil {
return
}
}
// Close the file in the archive
err = t.Flush()
if err != nil {
return
}
// If a directory, recurse into it
if file.IsDir() {
err = fs.Chdir(file.Name())
if err != nil {
return
}
return walk(fs, t)
}
}
return
}