add caddy server as system install

Signed-off-by: Nitishkumar Singh <nitishkumarsingh71@gmail.com>

README.md

@@ -244,15 +244,16 @@ Run the following to see what's available `arkade system install`:
 ```
   actions-runner  Install GitHub Actions Runner
   buildkitd       Install Buildkitd
+  caddy           Install Caddy Server
   cni             Install CNI plugins
   containerd      Install containerd
   firecracker     Install Firecracker
-  gitlab-runner   Install Gitlab Runner
+  gitlab-runner   Install GitLab Runner
   go              Install Go
   node            Install Node.js
   prometheus      Install Prometheus
+  registry        Install registry
   tc-redirect-tap Install tc-redirect-tap
-  registry        Install Open Source Registry implementation for storing and distributing container images using the OCI Distribution Specification
 ```
 
 The initial set of system apps is now complete, learn more in the original proposal: [Feature: system packages for Linux servers, CI and workstations #654](https://github.com/alexellis/arkade/issues/654)

cmd/system/caddy.go

@@ -0,0 +1,109 @@
+// Copyright (c) arkade author(s) 2024. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package system
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/alexellis/arkade/pkg/archive"
+	"github.com/alexellis/arkade/pkg/env"
+	"github.com/alexellis/arkade/pkg/get"
+	"github.com/spf13/cobra"
+)
+
+func MakeInstallCaddyServer() *cobra.Command {
+	command := &cobra.Command{
+		Use:   "caddy",
+		Short: "Install Caddy Server",
+		Long:  `Install Caddy Server which is an extensible server platform that uses TLS by default`,
+		Example: `  arkade system install caddy
+  arkade system install caddy --version <version>`,
+		SilenceUsage: true,
+	}
+
+	command.Flags().StringP("version", "v", "", "The version or leave blank to determine the latest available version")
+	command.Flags().String("path", "/usr/local/bin", "Installation path, where a caddy subfolder will be created")
+	command.Flags().Bool("progress", true, "Show download progress")
+	command.Flags().String("arch", "", "CPU architecture i.e. amd64")
+
+	command.PreRunE = func(cmd *cobra.Command, args []string) error {
+		return nil
+	}
+
+	command.RunE = func(cmd *cobra.Command, args []string) error {
+		installPath, _ := cmd.Flags().GetString("path")
+		version, _ := cmd.Flags().GetString("version")
+		fmt.Printf("Installing Caddy Server to %s\n", installPath)
+
+		installPath = strings.ReplaceAll(installPath, "$HOME", os.Getenv("HOME"))
+
+		if err := os.MkdirAll(installPath, 0755); err != nil && !os.IsExist(err) {
+			fmt.Printf("Error creating directory %s, error: %s\n", installPath, err.Error())
+		}
+
+		arch, osVer := env.GetClientArch()
+
+		if strings.ToLower(osVer) != "linux" {
+			return fmt.Errorf("this app only supports Linux")
+		}
+
+		if cmd.Flags().Changed("arch") {
+			arch, _ = cmd.Flags().GetString("arch")
+		}
+
+		dlArch := arch
+		if arch == "x86_64" {
+			dlArch = "amd64"
+		} else if arch == "aarch64" {
+			dlArch = "arm64"
+		} else {
+			dlArch = arch
+		}
+
+		if version == "" {
+			v, err := get.FindGitHubRelease("caddyserver", "caddy")
+			if err != nil {
+				return err
+			}
+			version = v
+		} else if !strings.HasPrefix(version, "v") {
+			version = "v" + version
+		}
+
+		fmt.Printf("Installing version: %s for: %s\n", version, dlArch)
+
+		filename := fmt.Sprintf("caddy_%s_linux_%s.tar.gz", strings.TrimPrefix(version, "v"), dlArch)
+		dlURL := fmt.Sprintf(githubDownloadTemplate, "caddyserver", "caddy", version, filename)
+
+		fmt.Printf("Downloading from: %s\n", dlURL)
+
+		progress, _ := cmd.Flags().GetBool("progress")
+		outPath, err := get.DownloadFileP(dlURL, progress)
+		if err != nil {
+			return err
+		}
+		defer os.Remove(outPath)
+
+		fmt.Printf("Downloaded to: %s\n", outPath)
+
+		f, err := os.OpenFile(outPath, os.O_RDONLY, 0644)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+
+		fmt.Printf("Unpacking Caddy to: %s\n", path.Join(installPath, "caddy"))
+
+		if err := archive.Untar(f, installPath, true, true); err != nil {
+			return err
+		}
+
+		return nil
+	}
+
+	return command
+}

cmd/system/install.go

@@ -32,6 +32,7 @@ func MakeInstall() *cobra.Command {
 	command.AddCommand(MakeInstallRegistry())
 	command.AddCommand(MakeInstallGitLabRunner())
 	command.AddCommand((MakeInstallBuildkitd()))
+	command.AddCommand(MakeInstallCaddyServer())
 
 	return command
 }