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Resume incompleted downloads #322

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Resume incompleted downloads #322

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19 changes: 12 additions & 7 deletions pkg/appstore/appstore_download.go
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Original file line number Diff line number Diff line change
Expand Up @@ -111,22 +111,27 @@ func (t *appstore) downloadFile(src, dst string, progress *progressbar.ProgressB
if err != nil {
return fmt.Errorf("failed to create request: %w", err)
}

file, err := t.os.OpenFile(dst, os.O_CREATE|os.O_RDWR, 0644)
if err != nil {
return fmt.Errorf("failed to open file: %w", err)
}

defer file.Close()
stat, _ := file.Stat()
req.Header.Add("range", fmt.Sprintf("bytes=%d-", stat.Size()))

res, err := t.httpClient.Do(req)
if err != nil {
return fmt.Errorf("request failed: %w", err)
}
defer res.Body.Close()

file, err := t.os.OpenFile(dst, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("failed to open file: %w", err)
}

defer file.Close()

if progress != nil {
progress.ChangeMax64(res.ContentLength)
progress.ChangeMax64(res.ContentLength + stat.Size())
progress.Set64(stat.Size())
file.Seek(0, io.SeekEnd)
_, err = io.Copy(io.MultiWriter(file, progress), res.Body)
} else {
_, err = io.Copy(file, res.Body)
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