install: Add ability to fetch an asset.

rookeries-online-installer.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -e
 
 # This is an installation setup for Rookeries targetting Linux + OS X.
 # Future support for other UNIX based operating systems is planned.
@@ -8,9 +8,10 @@ set -ex
 
 ROOKERIES_VERSION="0.16.0"
 INSTALL_PATH="/usr/local/bin/rookeries"
+ROOKERIES_BASE_FETCH_PATH="http://rookeries.org/static/downloads/${ROOKERIES_VERSION}/"
 
 detect_os () {
-  return "$(uname -s)"
+  echo "$(uname -s)"
 }
 
 check_curl_installed () {
@@ -66,12 +67,25 @@ install () {
 
   check_curl_installed
 
-  # TODO: Do the rest here.
+  echo "Fetching the right version of Rookeries for your OS"
+  local binary_to_fetch operating_system
+  operating_system="$(detect_os)"
+  case "${operating_system}" in
+    Linux)
+      binary_to_fetch="${ROOKERIES_BASE_FETCH_PATH}/rookeries-linux"
+    ;;
+    # TODO: Add support for OS X, and messages for Windows and not supported OS.
+  esac
+
+  # TODO: Add in check to see if already downloaded.
+  sudo curl --output "${INSTALL_PATH}" "${binary_to_fetch}"
+  # TODO: Add checksum check?
+  sudo chmod a+x "${INSTALL_PATH}"
   echo "Installer activated!"
 }
 
 uninstall () {
-  local is_installed uninstall_result
+  local is_installed
   is_installed="$(is_rookeries_installed)";
   if [ "${is_installed}" == "false" ]
   then