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feat(rpm): add rpm content extractor #44
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package archives | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "io/fs" | ||
| "log" | ||
| "os" | ||
| "path" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/sassoftware/go-rpmutils" | ||
| "github.com/sassoftware/go-rpmutils/cpio" | ||
| ) | ||
|
|
||
| func init() { | ||
| RegisterFormat(Rpm{}) | ||
| } | ||
|
|
||
| type Rpm struct { | ||
| // If true, errors encountered during reading or writing | ||
| // a file within an archive will be logged and the | ||
| // operation will continue on remaining files. | ||
| ContinueOnError bool | ||
| } | ||
|
|
||
| func (Rpm) Extension() string { return ".rpm" } | ||
| func (Rpm) MediaType() string { return "application/x-rpm" } | ||
|
|
||
| func (r Rpm) Match(_ context.Context, filename string, stream io.Reader) (MatchResult, error) { | ||
| var mr MatchResult | ||
|
|
||
| // match filename | ||
| if strings.Contains(strings.ToLower(filename), r.Extension()) { | ||
| mr.ByName = true | ||
| } | ||
|
|
||
| // match file header | ||
| buf, err := readAtMost(stream, len(rpmHeader)) | ||
| if err != nil { | ||
| return mr, err | ||
| } | ||
| mr.ByStream = bytes.Equal(buf, rpmHeader) | ||
|
|
||
| return mr, nil | ||
| } | ||
|
|
||
| func (r Rpm) Extract(ctx context.Context, sourceArchive io.Reader, handleFile FileHandler) error { | ||
| rpm, err := rpmutils.ReadRpm(sourceArchive) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| pre, err := rpm.PayloadReaderExtended() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // important to initialize to non-nil, empty value due to how fileIsIncluded works | ||
| skipDirs := skipList{} | ||
|
|
||
| for { | ||
| if err := ctx.Err(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| f, err := pre.Next() | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| if err != nil { | ||
| if r.ContinueOnError && ctx.Err() == nil { | ||
| log.Printf("[ERROR] Advancing to next file in rpm: %v", err) | ||
| continue | ||
| } | ||
| return err | ||
| } | ||
| if fileIsIncluded(skipDirs, f.Name()) { | ||
| continue | ||
| } | ||
|
|
||
| info := rpmFileInfo{f} | ||
| file := FileInfo{ | ||
| FileInfo: info, | ||
| Header: f, | ||
| NameInArchive: f.Name(), | ||
| Open: func() (fs.File, error) { | ||
| return fileInArchive{io.NopCloser(pre), info}, nil | ||
| }, | ||
| } | ||
|
|
||
| err = handleFile(ctx, file) | ||
| if errors.Is(err, fs.SkipAll) { | ||
| break | ||
| } else if errors.Is(err, fs.SkipDir) && file.IsDir() { | ||
| skipDirs.add(f.Name()) | ||
| } else if err != nil { | ||
| if r.ContinueOnError { | ||
| log.Printf("[ERROR] %s: %v", f.Name(), err) | ||
| continue | ||
| } | ||
| return fmt.Errorf("handling file: %s: %w", f.Name(), err) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // rpmFileInfo satisfies the fs.FileInfo interface for RPM entries. | ||
| type rpmFileInfo struct { | ||
| fi rpmutils.FileInfo | ||
| } | ||
|
|
||
| func (rfi rpmFileInfo) Name() string { return path.Base(rfi.fi.Name()) } | ||
| func (rfi rpmFileInfo) Size() int64 { return rfi.fi.Size() } | ||
| func (rfi rpmFileInfo) Mode() os.FileMode { return fs.FileMode(rfi.fi.Mode()) } | ||
| func (rfi rpmFileInfo) ModTime() time.Time { return time.Unix(int64(rfi.fi.Mtime()), 0) } | ||
| func (rfi rpmFileInfo) IsDir() bool { return rfi.fi.Mode()&^07777 == cpio.S_ISDIR } | ||
| func (rfi rpmFileInfo) Sys() any { return nil } | ||
|
|
||
| var rpmHeader = []byte{0x8e, 0xad, 0xe8, 0x01} |
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