Initial Burrito Commit (#153)

* Added burrito image-builder companion

* fixing for windows, adding dockerfile, general cleanup, added downloaded file caching (#1)

Co-authored-by: Luther Monson <[email protected]>

Author: perithompson

.gitignore

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+.idea

burrito/Dockerfile

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+FROM golang:1.16-alpine as builder
+
+COPY . /burrito
+WORKDIR /burrito
+RUN go build
+
+FROM alpine:latest as run
+WORKDIR /root/
+COPY --from=builder /burrito/burrito burrito
+RUN chmod +x burrito
+
+CMD ["./burrito", "serve", "-b"]

burrito/LICENSE

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burrito/README.md

@@ -0,0 +1,17 @@
+# Burrito
+
+The burrito is meant as a companion to image-builder to allow you to run a pod containing all of the components needed to build a windows image either offline or as an air-gapped image.
+
+Usage
+
+Config File
+``` yaml
+path: burrito
+components:
+  - name: kubernetes
+    src: <Source URL>
+    sha256: <SHA Hash of package>
+  - name: containerd
+    src: <Source URL>
+    sha256: <SHA Hash of package>
+```

burrito/cmd/build.go

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+/*
+Copyright © 2021 Peri Thompson
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(buildCmd)
+}
+
+// buildCmd represents the build command
+var buildCmd = &cobra.Command{
+	Use:   "build",
+	Short: "Download the resources specified in your config file ready to be served by the burrito",
+	Long: `
+	Read the specified config file and download the resources into the files 
+	sub directory.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		for _, c := range mc.Components {
+			path, err := os.Getwd()
+			if err != nil {
+				cmd.Println(err)
+			}
+			location := filepath.Join(path, mc.FsDir, c.Name)
+			if err := os.MkdirAll(location, os.ModePerm); err != nil {
+				panic(err)
+			}
+
+			log.Printf("validating file for %s\n", c.Name)
+			if err := DownloadFile(location, c.Source, c.Sha256); err != nil {
+				cobra.CheckErr(err)
+			}
+		}
+	},
+}
+
+// DownloadFile will download a url to a local file. It's efficient because it will
+// write as it downloads and not load the whole file into memory.
+func DownloadFile(folder, url, checksum string) error {
+	// Create the file
+	r, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return err
+	}
+	downloadlocation := filepath.Join(folder, path.Base(r.URL.Path))
+
+	if _, err := os.Stat(downloadlocation); err == nil {
+		log.Printf("file already exists: %s\n", downloadlocation)
+		return nil
+	}
+
+	log.Printf("fetching file %s\n", url)
+
+	// local file doesn't exist, download it
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	out, err := os.Create(downloadlocation)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	log.Printf("downloading file to %s\n", downloadlocation)
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		return err
+	}
+
+	if checksum == "" {
+		log.Printf("No checksum specified, skipping download validation: %s\n", downloadlocation)
+		return nil
+	}
+
+	hash, err := GetFileHash(downloadlocation)
+	if err != nil {
+		return err
+	}
+
+	if checksum != hash {
+		log.Printf("Expected: %s got %s\n", checksum, hash)
+		if err := os.Remove(downloadlocation); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func GetFileHash(file string) (string, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return "", nil
+	}
+	defer f.Close()
+	h := sha256.New()
+	if _, err := io.Copy(h, f); err != nil {
+		return "", err
+	}
+	hash := fmt.Sprintf("%x", h.Sum(nil))
+	return hash, nil
+}