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stream.go
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stream.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package maketarfs
import (
"archive/tar"
"context"
"io"
"io/fs"
"math"
"path/filepath"
"time"
"namespacelabs.dev/foundation/internal/bytestream"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnfs"
"namespacelabs.dev/foundation/internal/uniquestrings"
)
var FixedPoint = time.Unix(1, 1)
func TarFS(ctx context.Context, parentW io.Writer, vfs fs.FS, includeFiles []string, excludeFiles []string) error {
w := tar.NewWriter(parentW)
defer w.Close()
var inclusion uniquestrings.List
for _, f := range includeFiles {
inclusion.Add(f)
}
var exclusion uniquestrings.List
for _, f := range excludeFiles {
exclusion.Add(f)
}
dirs := map[string]bool{}
if err := fnfs.VisitFiles(ctx, vfs, func(path string, contents bytestream.ByteStream, _ fs.DirEntry) error {
if exclusion.Has(path) || (len(includeFiles) > 0 && !inclusion.Has(path)) {
return nil
}
dir := filepath.Dir(path)
if dir != "." && !dirs[dir] {
if err := w.WriteHeader(&tar.Header{
Name: dir,
Typeflag: tar.TypeDir,
Mode: 0555,
ModTime: FixedPoint,
}); err != nil {
return err
}
dirs[dir] = true
}
if contents.ContentLength() > math.MaxInt64 {
return fnerrors.New("file too big")
}
if err := w.WriteHeader(&tar.Header{
Name: path,
Size: int64(contents.ContentLength()),
Typeflag: tar.TypeReg,
Mode: 0555,
ModTime: FixedPoint,
}); err != nil {
return err
}
return bytestream.WriteTo(w, contents)
}); err != nil {
return err
}
if err := w.Close(); err != nil {
return err
}
return nil
}