84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
package tar
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import (
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"archive/tar"
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"compress/gzip"
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"errors"
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"io"
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"os"
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"path/filepath"
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errors2 "github.com/influxdata/influxdb/v2/pkg/errors"
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)
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// Untar takes a destination path and a reader; a tar reader loops over the tarfile
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// creating the file structure at 'dir' along the way, and writing any files
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func Untar(dir string, r io.Reader) (rErr error) {
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gzr, err := gzip.NewReader(r)
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if err != nil {
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return err
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}
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defer errors2.Capture(&rErr, gzr.Close)()
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tr := tar.NewReader(gzr)
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for {
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header, err := tr.Next()
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switch {
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// if no more files are found return
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case errors.Is(err, io.EOF):
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return nil
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// return any other error
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case err != nil:
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return err
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// if the header is nil, just skip it (not sure how this happens)
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case header == nil:
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continue
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}
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// the target location where the dir/file should be created
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target := filepath.Join(dir, header.Name)
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// the following switch could also be done using fi.Mode(), not sure if there
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// a benefit of using one vs. the other.
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// fi := header.FileInfo()
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// check the file type
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switch header.Typeflag {
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// if its a dir and it doesn't exist create it
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case tar.TypeDir:
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if _, err := os.Stat(target); err != nil {
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if err := os.MkdirAll(target, 0755); err != nil {
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return err
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}
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}
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// if it's a file create it
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case tar.TypeReg:
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if err := untarFile(target, tr, header); err != nil {
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return err
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}
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}
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}
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}
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func untarFile(target string, tr *tar.Reader, header *tar.Header) (rErr error) {
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f, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
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if err != nil {
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return err
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}
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defer errors2.Capture(&rErr, f.Close)()
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// copy over contents
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if _, err := io.Copy(f, tr); 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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