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102 lines
2.6 KiB
Markdown
102 lines
2.6 KiB
Markdown
# rpm
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[](https://pkg.go.dev/github.com/cavaliergopher/rpm) [](https://app.travis-ci.com/cavaliergopher/rpm) [](https://goreportcard.com/report/github.com/cavaliergopher/rpm)
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Package rpm implements the rpm package file format.
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$ go get github.com/cavaliergopher/rpm
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See the [package documentation](https://pkg.go.dev/github.com/cavaliergopher/rpm)
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or the examples programs in `cmd/` to get started.
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## Extracting rpm packages
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The following working example demonstrates how to extract files from an rpm
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package. In this example, only the cpio format and xz compression are supported
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which will cover most cases.
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Implementations should consider additional formats and compressions algorithms,
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as well as support for extracting irregular file types and configuring
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permissions, uids and guids, etc.
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```go
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package main
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import (
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"io"
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"log"
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"os"
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"path/filepath"
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"github.com/cavaliergopher/cpio"
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"github.com/cavaliergopher/rpm"
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"github.com/ulikunitz/xz"
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)
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func ExtractRPM(name string) {
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// Open a package file for reading
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f, err := os.Open(name)
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if err != nil {
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log.Fatal(err)
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}
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defer f.Close()
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// Read the package headers
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pkg, err := rpm.Read(f)
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if err != nil {
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log.Fatal(err)
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}
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// Check the compression algorithm of the payload
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if compression := pkg.PayloadCompression(); compression != "xz" {
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log.Fatalf("Unsupported compression: %s", compression)
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}
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// Attach a reader to decompress the payload
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xzReader, err := xz.NewReader(f)
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if err != nil {
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log.Fatal(err)
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}
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// Check the archive format of the payload
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if format := pkg.PayloadFormat(); format != "cpio" {
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log.Fatalf("Unsupported payload format: %s", format)
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}
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// Attach a reader to unarchive each file in the payload
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cpioReader := cpio.NewReader(xzReader)
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for {
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// Move to the next file in the archive
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hdr, err := cpioReader.Next()
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if err == io.EOF {
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break // no more files
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}
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if err != nil {
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log.Fatal(err)
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}
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// Skip directories and other irregular file types in this example
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if !hdr.Mode.IsRegular() {
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continue
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}
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// Create the target directory
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if dirName := filepath.Dir(hdr.Name); dirName != "" {
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if err := os.MkdirAll(dirName, 0o755); err != nil {
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log.Fatal(err)
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}
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}
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// Create and write the file
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outFile, err := os.Create(hdr.Name)
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if err != nil {
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log.Fatal(err)
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}
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if _, err := io.Copy(outFile, cpioReader); err != nil {
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outFile.Close()
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log.Fatal(err)
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}
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outFile.Close()
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}
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}
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```
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