fix: use wget, error out on missing deps

See coop-cloud/organising#280.

cli/server/add.go

@@ -117,7 +117,17 @@ func installDockerLocal(c *cli.Context) error {
 		logrus.Fatal("exiting as requested")
 	}
 
-	cmd := exec.Command("bash", "-c", "curl -s https://get.docker.com | bash")
+	for _, exe := range []string{"wget", "bash"} {
+		exists, err := ensureLocalExecutable(exe)
+		if err != nil {
+			return err
+		}
+		if !exists {
+			return fmt.Errorf("%s missing, please install it", exe)
+		}
+	}
+
+	cmd := exec.Command("bash", "-c", "wget -O- https://install.abra.coopcloud.tech | bash")
 	if err := internal.RunCmd(cmd); err != nil {
 		return err
 	}
@@ -136,15 +146,17 @@ func newLocalServer(c *cli.Context, domainName string) error {
 	}
 
 	if provision {
-		out, err := exec.Command("which", "docker").Output()
+		exists, err := ensureLocalExecutable("docker")
 		if err != nil {
 			return err
 		}
-		if string(out) == "" {
+
+		if !exists {
 			if err := installDockerLocal(c); err != nil {
 				return err
 			}
 		}
+
 		if err := initSwarmLocal(c, cl, domainName); err != nil {
 			if !strings.Contains(err.Error(), "proxy already exists") {
 				logrus.Fatal(err)
@@ -195,12 +207,12 @@ func newClient(c *cli.Context, domainName string) (*dockerClient.Client, error)
 }
 
 func installDocker(c *cli.Context, cl *dockerClient.Client, sshCl *ssh.Client, domainName string) error {
-	result, err := sshCl.Exec("which docker")
-	if err != nil && string(result) != "" {
+	exists, err := ensureRemoteExecutable("docker", sshCl)
+	if err != nil {
 		return err
 	}
 
-	if string(result) == "" {
+	if !exists {
 		fmt.Println(fmt.Sprintf(dockerInstallMsg, domainName))
 
 		response := false
@@ -214,7 +226,17 @@ func installDocker(c *cli.Context, cl *dockerClient.Client, sshCl *ssh.Client, d
 			logrus.Fatal("exiting as requested")
 		}
 
-		cmd := "curl -s https://get.docker.com | bash"
+		for _, exe := range []string{"wget", "bash"} {
+			exists, err := ensureRemoteExecutable(exe, sshCl)
+			if err != nil {
+				return err
+			}
+			if !exists {
+				return fmt.Errorf("%s missing on remote, please install it", exe)
+			}
+		}
+
+		cmd := "wget -O- https://install.abra.coopcloud.tech | bash"
 
 		var sudoPass string
 		if askSudoPass {
@@ -485,3 +507,23 @@ You may omit flags to avoid performing this provisioning logic.
 		return nil
 	},
 }
+
+// ensureLocalExecutable ensures that an executable is present on the local machine
+func ensureLocalExecutable(exe string) (bool, error) {
+	out, err := exec.Command("which", exe).Output()
+	if err != nil {
+		return false, err
+	}
+
+	return string(out) == "", nil
+}
+
+// ensureRemoteExecutable ensures that an executable is present on a remote machine
+func ensureRemoteExecutable(exe string, sshCl *ssh.Client) (bool, error) {
+	out, err := sshCl.Exec(fmt.Sprintf("which %s", exe))
+	if err != nil && string(out) != "" {
+		return false, err
+	}
+
+	return string(out) == "", nil
+}