add fetch mode

cmd/srpmproc/fetch.go

+package main
+
+import (
+	"errors"
+	"fmt"
+	"github.com/mstg/srpmproc/internal"
+	"github.com/spf13/cobra"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+var fetch = &cobra.Command{
+	Use: "fetch",
+	Run: runFetch,
+}
+
+var cdnUrl string
+
+func init() {
+	fetch.Flags().StringVar(&cdnUrl, "cdn-url", "", "Path to CDN")
+	_ = fetch.MarkFlagRequired("cdn-url")
+}
+
+func runFetch(_ *cobra.Command, _ []string) {
+	wd, err := os.Getwd()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	metadataPath := ""
+	err = filepath.Walk(wd, func(path string, info os.FileInfo, err error) error {
+		if strings.HasSuffix(path, ".metadata") {
+			if metadataPath != "" {
+				return errors.New("multiple metadata files")
+			}
+			metadataPath = path
+		}
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	name := strings.Split(metadataPath, ".")[1]
+
+	metadataFile, err := os.Open(metadataPath)
+	if err != nil {
+		log.Fatalf("could not open metadata file: %v", err)
+	}
+
+	fileBytes, err := ioutil.ReadAll(metadataFile)
+	if err != nil {
+		log.Fatalf("could not read metadata file: %v", err)
+	}
+
+	cmd := exec.Command("git", "branch", "--show-current")
+	branchByte, err := cmd.Output()
+	if err != nil {
+		log.Fatalf("could not get branch: %v", err)
+	}
+	branch := strings.TrimSuffix(string(branchByte), "\n")
+
+	client := &http.Client{
+		Transport: &http.Transport{
+			DisableCompression: false,
+		},
+	}
+	fileContent := strings.Split(string(fileBytes), "\n")
+	for _, line := range fileContent {
+		if strings.TrimSpace(line) == "" {
+			continue
+		}
+
+		lineInfo := strings.Split(line, " ")
+		hash := lineInfo[0]
+		path := lineInfo[1]
+
+		url := fmt.Sprintf("%s/%s/%s/%s", cdnUrl, name, branch, hash)
+		log.Printf("downloading %s", url)
+
+		req, err := http.NewRequest("GET", url, nil)
+		if err != nil {
+			log.Fatalf("could not create new http request: %v", err)
+		}
+		req.Header.Set("Accept-Encoding", "*")
+
+		resp, err := client.Do(req)
+		if err != nil {
+			log.Fatalf("could not download dist-git file: %v", err)
+		}
+
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			log.Fatalf("could not read the whole dist-git file: %v", err)
+		}
+		err = resp.Body.Close()
+		if err != nil {
+			log.Fatalf("could not close body handle: %v", err)
+		}
+
+		hasher := internal.CompareHash(body, hash)
+		if hasher == nil {
+			log.Fatal("checksum in metadata does not match dist-git file")
+		}
+
+		err = os.MkdirAll(filepath.Dir(path), 0755)
+		if err != nil {
+			log.Fatalf("could create all directories")
+		}
+
+		f, err := os.Create(path)
+		if err != nil {
+			log.Fatalf("could not open file pointer: %v", err)
+		}
+
+		_, err = f.Write(body)
+		if err != nil {
+			log.Fatalf("could not copy dist-git file to in-tree: %v", err)
+		}
+		_ = f.Close()
+	}
+}
+
+func init() {
+	root.AddCommand(fetch)
+}

internal/process.go

@@ -166,7 +166,7 @@ func ProcessRPM(pd *ProcessData) {
 				log.Fatalf("could not write to metadata file: %v", err)
 			}
 
-			path := fmt.Sprintf("%s-%s/%s", rpmFile.Name(), md.pushBranch, checksum)
+			path := fmt.Sprintf("%s/%s/%s", rpmFile.Name(), md.pushBranch, checksum)
 			pd.BlobStorage.Write(path, sourceFileBts)
 			log.Printf("wrote %s to blob storage", path)
 		}

internal/utils.go

@@ -87,6 +87,7 @@ func CompareHash(content []byte, checksum string) hash.Hash {
 
 	calculated := hex.EncodeToString(hashType.Sum(nil))
 	if calculated != checksum {
+		log.Printf("wanted checksum %s, but got %s", checksum, calculated)
 		return nil
 	}