package testutil import ( "archive/tar" "bytes" crand "crypto/rand" "fmt" "io" mrand "math/rand" "time" "github.com/distribution/distribution/v3" "github.com/distribution/distribution/v3/context" "github.com/opencontainers/go-digest" ) // CreateRandomTarFile creates a random tarfile, returning it as an // io.ReadSeeker along with its digest. An error is returned if there is a // problem generating valid content. func CreateRandomTarFile() (rs io.ReadSeeker, dgst digest.Digest, err error) { nFiles := mrand.Intn(10) + 10 target := &bytes.Buffer{} wr := tar.NewWriter(target) // Perturb this on each iteration of the loop below. header := &tar.Header{ Mode: 0o644, ModTime: time.Now(), Typeflag: tar.TypeReg, Uname: "randocalrissian", Gname: "cloudcity", AccessTime: time.Now(), ChangeTime: time.Now(), } for fileNumber := 0; fileNumber < nFiles; fileNumber++ { fileSize := mrand.Int63n(1<<20) + 1<<20 header.Name = fmt.Sprint(fileNumber) header.Size = fileSize if err := wr.WriteHeader(header); err != nil { return nil, "", err } randomData := make([]byte, fileSize) // Fill up the buffer with some random data. n, err := crand.Read(randomData) if n != len(randomData) { return nil, "", fmt.Errorf("short read creating random reader: %v bytes != %v bytes", n, len(randomData)) } if err != nil { return nil, "", err } nn, err := io.Copy(wr, bytes.NewReader(randomData)) if nn != fileSize { return nil, "", fmt.Errorf("short copy writing random file to tar") } if err != nil { return nil, "", err } if err := wr.Flush(); err != nil { return nil, "", err } } if err := wr.Close(); err != nil { return nil, "", err } dgst = digest.FromBytes(target.Bytes()) return bytes.NewReader(target.Bytes()), dgst, nil } // CreateRandomLayers returns a map of n digests. We don't particularly care // about the order of said digests (since they're all random anyway). func CreateRandomLayers(n int) (map[digest.Digest]io.ReadSeeker, error) { digestMap := map[digest.Digest]io.ReadSeeker{} for i := 0; i < n; i++ { rs, ds, err := CreateRandomTarFile() if err != nil { return nil, fmt.Errorf("unexpected error generating test layer file: %v", err) } digestMap[ds] = rs } return digestMap, nil } // UploadBlobs lets you upload blobs to a repository func UploadBlobs(repository distribution.Repository, layers map[digest.Digest]io.ReadSeeker) error { ctx := context.Background() for dgst, rs := range layers { wr, err := repository.Blobs(ctx).Create(ctx) if err != nil { return fmt.Errorf("unexpected error creating upload: %v", err) } if _, err := io.Copy(wr, rs); err != nil { return fmt.Errorf("unexpected error copying to upload: %v", err) } if _, err := wr.Commit(ctx, distribution.Descriptor{Digest: dgst}); err != nil { return fmt.Errorf("unexpected error committinng upload: %v", err) } } return nil }