76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
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package vagrant
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import (
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"archive/tar"
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"compress/gzip"
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"encoding/json"
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"io"
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"os"
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"path/filepath"
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)
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// DirToBox takes the directory and compresses it into a Vagrant-compatible
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// box. This function does not perform checks to verify that dir is
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// actually a proper box. This is an expected precondition.
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func DirToBox(dst, dir string) error {
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dstF, err := os.Create(dst)
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if err != nil {
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return err
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}
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defer dstF.Close()
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gzipWriter := gzip.NewWriter(dstF)
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defer gzipWriter.Close()
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tarWriter := tar.NewWriter(gzipWriter)
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defer tarWriter.Close()
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// This is the walk func that tars each of the files in the dir
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tarWalk := func(path string, info os.FileInfo, prevErr error) error {
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f, err := os.Open(path)
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if err != nil {
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return err
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}
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defer f.Close()
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header, err := tar.FileInfoHeader(info, "")
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if err != nil {
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return err
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}
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// We have to set the Name explicitly because it is supposed to
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// be a relative path to the root. Otherwise, the tar ends up
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// being a bunch of files in the root, even if they're actually
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// nested in a dir in the original "dir" param.
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header.Name, err = filepath.Rel(dir, path)
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if err != nil {
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return err
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}
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if err := tarWriter.WriteHeader(header); err != nil {
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return err
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}
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if _, err := io.Copy(tarWriter, f); err != nil {
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return err
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}
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return nil
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}
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// Tar.gz everything up
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return filepath.Walk(dir, tarWalk)
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}
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// WriteMetadata writes the "metadata.json" file for a Vagrant box.
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func WriteMetadata(dir string, contents interface{}) error {
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f, err := os.Create(filepath.Join(dir, "metadata.json"))
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if err != nil {
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return err
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}
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defer f.Close()
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enc := json.NewEncoder(f)
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return enc.Encode(contents)
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}
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