113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
package selfupdate
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import (
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"archive/tar"
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"archive/zip"
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"bytes"
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"compress/gzip"
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"fmt"
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"github.com/ulikunitz/xz"
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"io"
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"io/ioutil"
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"path/filepath"
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"strings"
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)
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func unarchiveTar(src io.Reader, url, cmd string) (io.Reader, error) {
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t := tar.NewReader(src)
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for {
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h, err := t.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, fmt.Errorf("Failed to unarchive .tar file: %s", err)
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}
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_, name := filepath.Split(h.Name)
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if name == cmd {
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log.Println("Executable file", h.Name, "was found in tar archive")
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return t, nil
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}
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}
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return nil, fmt.Errorf("File '%s' for the command is not found in %s", cmd, url)
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}
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// UncompressCommand uncompresses the given source. Archive and compression format is
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// automatically detected from 'url' parameter, which represents the URL of asset.
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// This returns a reader for the uncompressed command given by 'cmd'. '.zip',
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// '.tar.gz', '.tar.xz', '.gz' and '.xz' are supported.
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func UncompressCommand(src io.Reader, url, cmd string) (io.Reader, error) {
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if strings.HasSuffix(url, ".zip") {
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log.Println("Uncompressing zip file", url)
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// Zip format requires its file size for uncompressing.
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// So we need to read the HTTP response into a buffer at first.
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buf, err := ioutil.ReadAll(src)
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if err != nil {
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return nil, fmt.Errorf("Failed to create buffer for zip file: %s", err)
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}
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r := bytes.NewReader(buf)
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z, err := zip.NewReader(r, r.Size())
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if err != nil {
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return nil, fmt.Errorf("Failed to uncompress zip file: %s", err)
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}
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for _, file := range z.File {
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_, name := filepath.Split(file.Name)
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if !file.FileInfo().IsDir() && name == cmd {
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log.Println("Executable file", file.Name, "was found in zip archive")
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return file.Open()
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}
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}
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return nil, fmt.Errorf("File '%s' for the command is not found in %s", cmd, url)
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} else if strings.HasSuffix(url, ".tar.gz") {
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log.Println("Uncompressing tar.gz file", url)
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gz, err := gzip.NewReader(src)
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if err != nil {
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return nil, fmt.Errorf("Failed to uncompress .tar.gz file: %s", err)
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}
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return unarchiveTar(gz, url, cmd)
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} else if strings.HasSuffix(url, ".gzip") || strings.HasSuffix(url, ".gz") {
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log.Println("Uncompressing gzip file", url)
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r, err := gzip.NewReader(src)
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if err != nil {
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return nil, fmt.Errorf("Failed to uncompress gzip file downloaded from %s: %s", url, err)
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}
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name := r.Header.Name
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if name != cmd {
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return nil, fmt.Errorf("File name '%s' does not match to command '%s' found in %s", name, cmd, url)
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}
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log.Println("Executable file", name, "was found in gzip file")
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return r, nil
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} else if strings.HasSuffix(url, ".tar.xz") {
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log.Println("Uncompressing tar.xz file", url)
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xzip, err := xz.NewReader(src)
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if err != nil {
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return nil, fmt.Errorf("Failed to uncompress .tar.xz file: %s", err)
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}
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return unarchiveTar(xzip, url, cmd)
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} else if strings.HasSuffix(url, ".xz") {
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log.Println("Uncompressing xzip file", url)
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xzip, err := xz.NewReader(src)
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if err != nil {
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return nil, fmt.Errorf("Failed to uncompress xzip file downloaded from %s: %s", url, err)
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}
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log.Println("Uncompressed file from xzip is assumed to be an executable", cmd)
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return xzip, nil
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}
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log.Println("Uncompression is not needed", url)
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return src, nil
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}
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