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/
unpack.go
84 lines (66 loc) · 1.67 KB
/
unpack.go
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package pm
import (
"archive/tar"
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
)
func Unpack(baseDir string, pkg io.Reader) ([]string, error) {
if baseDir == "" {
return nil, fmt.Errorf("pm: no base directory specified")
}
gz, err := gzip.NewReader(pkg)
if err != nil {
return nil, fmt.Errorf("pm: cannot unpack: package is not compressed with gzip")
}
defer gz.Close()
tr := tar.NewReader(gz)
var files = make([]string, 0)
var meta Metadata
for {
hdr, err := tr.Next()
if err != nil && err == io.EOF {
break
} else if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
if _, err := buf.ReadFrom(tr); err != nil {
return nil, fmt.Errorf("failed to read %q from archive: %v", hdr.Name, err)
}
br := bytes.NewReader(buf.Bytes())
if filepath.Base(hdr.Name) == "metadata.json" {
dec := json.NewDecoder(br)
if err := dec.Decode(&meta); err != nil {
return nil, fmt.Errorf("failed to load metadata file from archive: %v", err)
}
br.Seek(0, 0)
}
tgt := filepath.Join(baseDir, hdr.Name)
if err := os.MkdirAll(filepath.Dir(tgt), 0755); err != nil {
return nil, err
}
f, err := os.Create(tgt)
if err != nil {
return nil, err
}
if _, err := io.Copy(f, br); err != nil {
f.Close()
return nil, err
}
files = append(files, tgt)
f.Close()
}
// Fix the permissions on the unpacked binaries.
for _, bin := range meta.Binaries {
binPath := filepath.Join(baseDir, fmt.Sprintf("%s-%s", meta.Name, meta.Version), bin)
if err := os.Chmod(binPath, 0755); err != nil {
return nil, fmt.Errorf("failed to change permissions for %q: %v", binPath, err)
}
}
return files, nil
}