feat(installer): add kubergrunt installer

bin/download

@@ -2,19 +2,12 @@
 
 set -euo pipefail
 
-# shellcheck source=../lib/utils.bash
+# shellcheck source=lib/utils.bash
 source "$(dirname "$0")/../lib/utils.bash"
 
 mkdir -p "$ASDF_DOWNLOAD_PATH"
 
-# TODO: Adapt this to proper extension and adapt extracting strategy.
-release_file="$ASDF_DOWNLOAD_PATH/$TOOL_NAME-$ASDF_INSTALL_VERSION.tar.gz"
+release_file="$ASDF_DOWNLOAD_PATH/$TOOL_NAME"
 
-# Download tar.gz file to the download directory
+# Download binary file to the download directory
 download_release "$ASDF_INSTALL_VERSION" "$release_file"
-
-#  Extract contents of tar.gz file into the download directory
-tar -xzf "$release_file" -C "$ASDF_DOWNLOAD_PATH" --strip-components=1 || fail "Could not extract $release_file"
-
-# Remove the tar.gz file since we don't need to keep it
-rm "$release_file"

bin/install

@@ -5,7 +5,7 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "$current_script_path")")
 
-# shellcheck source=../lib/utils.bash
+# shellcheck source=lib/utils.bash
 source "${plugin_dir}/lib/utils.bash"
 
 install_version "$ASDF_INSTALL_TYPE" "$ASDF_INSTALL_VERSION" "$ASDF_INSTALL_PATH"

bin/list-all

@@ -5,7 +5,7 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "$current_script_path")")
 
-# shellcheck source=../lib/utils.bash
+# shellcheck source=lib/utils.bash
 source "${plugin_dir}/lib/utils.bash"
 
 list_all_versions | sort_versions | xargs echo

lib/utils.bash

@@ -2,7 +2,6 @@
 
 set -euo pipefail
 
-# TODO: Ensure this is the correct GitHub homepage where releases can be downloaded for kubergrunt.
 GH_REPO="https://github.com/gruntwork-io/kubergrunt"
 TOOL_NAME="kubergrunt"
 TOOL_TEST="kubergrunt --version"
@@ -31,21 +30,27 @@ list_github_tags() {
 }
 
 list_all_versions() {
-  # TODO: Adapt this. By default we simply list the tag names from GitHub releases.
   # Change this function if kubergrunt has other means of determining installable versions.
   list_github_tags
 }
 
 download_release() {
+  platform=$(get_platform)
+  arch=$(get_arch)
+  ext=""
+
+  case $platform in
+    windows) ext=".exe" ;;
+  esac
+
   local version filename url
   version="$1"
-  filename="$2"
-
-  # TODO: Adapt the release URL convention for kubergrunt
-  url="$GH_REPO/archive/v${version}.tar.gz"
+  filename="$2$ext"
+  url="$GH_REPO/releases/download/v${version}/${TOOL_NAME}_${platform}_${arch}${ext}"
 
   echo "* Downloading $TOOL_NAME release $version..."
   curl "${curl_opts[@]}" -o "$filename" -C - "$url" || fail "Could not download $url"
+  chmod +x "$filename"
 }
 
 install_version() {
@@ -58,10 +63,9 @@ install_version() {
   fi
 
   (
-    mkdir -p "$install_path"
-    cp -r "$ASDF_DOWNLOAD_PATH"/* "$install_path"
+    mkdir -p "$install_path/bin"
+    cp -R "$ASDF_DOWNLOAD_PATH/." "$install_path/bin"
 
-    # TODO: Asert kubergrunt executable exists.
     local tool_cmd
     tool_cmd="$(echo "$TOOL_TEST" | cut -d' ' -f1)"
     test -x "$install_path/bin/$tool_cmd" || fail "Expected $install_path/bin/$tool_cmd to be executable."
@@ -72,3 +76,34 @@ install_version() {
     fail "An error ocurred while installing $TOOL_NAME $version."
   )
 }
+
+get_arch() {
+  local arch=""
+
+  case "$(uname -m)" in
+    x86_64 | amd64) arch="amd64" ;;
+    i686 | i386) arch="386" ;;
+    armv6l | armv7l) arch="arm" ;;
+    aarch64 | arm64) arch="arm64" ;;
+    *)
+      fail "Arch '$(uname -m)' not supported!"
+      ;;
+  esac
+
+  echo -n $arch
+}
+
+get_platform() {
+  local platform=""
+
+  case "$(uname | tr '[:upper:]' '[:lower:]')" in
+    darwin) platform="darwin" ;;
+    linux) platform="linux" ;;
+    windows) platform="windows" ;;
+    *)
+      fail "Platform '$(uname -m)' not supported!"
+      ;;
+  esac
+
+  echo -n $platform
+}