Initial commit

Signed-off-by: jolheiser <john.olheiser@gmail.com>

.drone.yml

@@ -0,0 +1,41 @@
+---
+kind: pipeline
+name: compliance
+trigger:
+  event:
+    - pull_request
+steps:
+  - name: test
+    pull: always
+    image: golang:1.16
+    commands:
+      - go test -race ./...
+  - name: check
+    pull: always
+    image: golang:1.16
+    commands:
+      - go vet ./...
+
+---
+kind: pipeline
+name: release
+trigger:
+  event:
+    - push
+  branch:
+    - main
+steps:
+  - name: build
+    pull: always
+    image: golang:1.16
+    commands:
+      - go build git.jojodev.com/golang/dl/cmd/godl
+  - name: gitea-release
+    pull: always
+    image: jolheiser/drone-gitea-main:latest
+    settings:
+      token:
+        from_secret: gitea_token
+      base: https://git.jojodev.com
+      files:
+        - "godl"

.gitignore

@@ -0,0 +1,2 @@
+.idea/
+/godl*

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 John Olheiser
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,9 @@
+# dl
+
+`https://golang.org/dl/?mode=json`
+
+**NOTE:** This URL may not remain permanent, it is simply usable at the time of writing this library.
+
+## License
+
+[MIT](LICENSE)

cmd/godl/godl.go

@@ -0,0 +1,144 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"git.jojodev.com/golang/dl"
+
+	"github.com/schollz/progressbar/v3"
+)
+
+func main() {
+	installFlag := flag.Bool("install", false, "Install/Update Go (Linux only)")
+	versionFlag := flag.Bool("version", false, "Only print version")
+	outFlag := flag.String("out", ".", "Where to put the downloaded file")
+	flag.Parse()
+
+	latest, err := latestVersion()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	if *versionFlag {
+		fmt.Println(latest.Version)
+		return
+	}
+
+	outPath, err := download(latest.Filename, *outFlag)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println(outPath)
+
+	if !*installFlag {
+		return
+	}
+
+	if !strings.EqualFold(runtime.GOOS, "linux") {
+		fmt.Println("Install option is only for Linux. Mac and Windows users should run the downloaded installer.")
+		return
+	}
+
+	if os.Geteuid() != 0 {
+		fmt.Println(`This command must be run as root to perform the install.
+Alternatively, you can run the following command manually, which is taken from https://golang.org/doc/install#install
+
+rm -rf /usr/local/go && tar -C /usr/local -xzf ` + outPath)
+		return
+	}
+
+	fmt.Println("removing local installation")
+	rm := exec.Command("rm", "-rf", "/usr/local/go")
+	if err := rm.Run(); err != nil {
+		fmt.Printf("could not remove local go installation: %v\n", err)
+		return
+	}
+
+	fmt.Println("extracting new installation")
+	tar := exec.Command("tar", "-C", "/usr/local", "-xzf", outPath)
+	if err := tar.Run(); err != nil {
+		fmt.Printf("could not extract new installation: %v\n", err)
+		return
+	}
+
+	rmDl := exec.Command("rm", outPath)
+	if err := rmDl.Run(); err != nil {
+		fmt.Printf("could not remove downloaded file: %v\n", err)
+		return
+	}
+
+	goVersion := exec.Command("/usr/local/go/bin/go", "version")
+	out, err := goVersion.Output()
+	if err != nil {
+		fmt.Printf("could not check go version: %v\n", err)
+		return
+	}
+
+	fmt.Printf("Successfully installed: %s\n", string(out))
+}
+
+func latestVersion() (*dl.File, error) {
+	versions, err := dl.Versions(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf("could not get latest Go version(s): %v", err)
+	}
+	if len(versions) < 1 {
+		return nil, fmt.Errorf("no latest Go version(s) found: %v", err)
+	}
+
+	var version dl.File
+	for _, file := range versions[0].Files {
+		if strings.EqualFold(file.OS, runtime.GOOS) && strings.EqualFold(file.Arch, runtime.GOARCH) {
+			version = file
+			break
+		}
+	}
+	if version.Filename == "" {
+		return nil, fmt.Errorf("could not find a download for OS = %s | Arch = %s", runtime.GOOS, runtime.GOARCH)
+	}
+
+	return &version, nil
+}
+
+func download(filename, out string) (string, error) {
+	outPath := filepath.Join(out, filename)
+	outFile, err := os.Create(outPath)
+	if err != nil {
+		return outPath, fmt.Errorf("could not create file for download: %v", err)
+	}
+	defer outFile.Close()
+
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("https://golang.org/dl/%s", filename), nil)
+	if err != nil {
+		return outPath, fmt.Errorf("could not create request: %v", err)
+	}
+	req.Header.Set("User-Agent", "git.jojodev.com/golang/dl/cmd/godl")
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return outPath, fmt.Errorf("could not download file: %v", err)
+	}
+	defer res.Body.Close()
+
+	bar := progressbar.DefaultBytes(
+		res.ContentLength,
+		fmt.Sprintf("downloading %s", filename),
+	)
+
+	if _, err := io.Copy(io.MultiWriter(outFile, bar), res.Body); err != nil {
+		return outPath, err
+	}
+
+	return outPath, nil
+}

dl.go

@@ -0,0 +1,49 @@
+package dl
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+)
+
+const dlURL = "https://golang.org/dl/?mode=json"
+
+// Version is a Go version
+type Version struct {
+	Version string `json:"version"`
+	Stable  bool   `json:"stable"`
+	Files   []File `json:"files"`
+}
+
+// File is a dl file
+type File struct {
+	Filename string `json:"filename"`
+	OS       string `json:"os"`
+	Arch     string `json:"arch"`
+	Version  string `json:"version"`
+	Sha256   string `json:"sha256"`
+	Size     int    `json:"size"`
+	Kind     string `json:"kind"`
+}
+
+// Versions gets the latest Version(s) from dl
+func Versions(ctx context.Context) ([]Version, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, dlURL, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", "git.jojodev.com/golang/dl")
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	var versions []Version
+	if err := json.NewDecoder(res.Body).Decode(&versions); err != nil {
+		return nil, err
+	}
+
+	return versions, nil
+}

go.mod

@@ -0,0 +1,5 @@
+module git.jojodev.com/golang/dl
+
+go 1.16
+
+require github.com/schollz/progressbar/v3 v3.8.2

go.sum

@@ -0,0 +1,31 @@
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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
+github.com/mattn/go-isatty v0.0.13/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
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