feat(go-air): set go as soft dependency and add option to install from github

BREAKING CHANGE: upgrades to v1.1.0

Author: kucingkode

src/go-air/devcontainer-feature.json

@@ -1,7 +1,7 @@
 {
     "name": "Air",
     "id": "go-air",
-    "version": "1.0.0",
+    "version": "1.1.0",
     "documentationURL": "http://github.com/omoxyz/devcontainer-features/tree/main/src/go-air",
     "description": "Install Air live reloader for Go apps.",
     "options": {
@@ -12,9 +12,15 @@
                 "latest"
             ],
             "type": "string"
+        },
+        "installDirectlyFromGitHubRelease": {
+            "type": "boolean",
+            "description": "Install directly from Github release or from package manager (apt).",
+            "default": true
         }
     },
-    "dependsOn": {
-        "ghcr.io/devcontainers/features/go": {}
-    }
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/git",
+        "ghcr.io/devcontainers/features/go"
+    ]
 }

src/go-air/install.sh

@@ -1,15 +1,89 @@
 #!/usr/bin/env bash
 
+if [ "$(id -u)" -ne 0 ]; then
+    echo -e 'Scripts must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+    exit 1
+fi
+
 source ./utils.sh
 
 AIR_VERSION=${VERSION:-"latest"}
+INSTALL_DIRECTLY_FROM_GITHUB_RELEASE=${INSTALLDIRECTLYFROMGITHUBRELEASE:-"true"}
 GITHUB_REPO=https://github.com/air-verse/air/
 
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
+apt_get_update
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
 export DEBIAN_FRONTEND=noninteractive
 
+install_using_go() {
+    local latest_version=$1
+    local prev_version=$2
+
+    set +e
+
+    go install github.com/air-verse/air@v${latest_version}
+    exit_code=$?
+
+    set -e
+
+    if [ "$exit_code" != "0" ]; then
+        # Handle situation where git tags are ahead of what was is available to actually download
+        echo "(!) air version ${latest_version} failed to download. Attempting to fall back to ${prev_version} to retry..."
+        go install github.com/air-verse/air@v${prev_version}
+    fi
+}
+
+get_github_filename() {
+    local version=$1
+    local arch=$2
+    echo "air_${version}_linux_${arch}"
+}
+
+install_from_github() {
+    local latest_version=$1
+    local prev_version=$2
+
+    check_packages wget
+    local arch=$(dpkg --print-architecture)
+
+    local filename=$(get_github_filename $latest_version $arch)
+
+    set +e
+
+    mkdir -p /tmp/air
+    pushd /tmp/air
+    wget ${GITHUB_REPO}/releases/download/v${latest_version}/${filename}
+    local exit_code=$?
+
+    set -e
+
+    if [ "$exit_code" != "0" ]; then
+        # Handle situation where git tags are ahead of what was is available to actually download
+        echo "(!) air version ${latest_version} failed to download. Attempting to fall back to ${prev_version} to retry..."
+        filename=$(get_github_filename $prev_version $arch)
+        wget ${GITHUB_REPO}/releases/download/v${prev_version}/${filename}
+    fi
+
+    chmod 755 /tmp/air/${filename}
+    mv /tmp/air/${filename} /usr/local/bin/air
+    popd
+    rm -rf /tmp/air
+}
+
+# Install curl if missing
+check_packages curl ca-certificates
+
+# Install git if missing
+if ! type git > /dev/null 2>&1; then
+    check_packages git
+fi
+
 version_list=$(git ls-remote --tags ${GITHUB_REPO})
 
 versions=($(find_latest_versions $AIR_VERSION version_list "tags/v"))
@@ -19,19 +93,15 @@ if [ $? -eq 1 ]; then
 fi
 
 latest_version=${versions[0]}
-prev_version=${versions[1]}
+prev_version=${versions[1]:-$latest_version}
 
 echo "Downloading air v${latest_version}...."
 
-set +e
-
-go install github.com/air-verse/air@v${latest_version}
-exit_code=$?
-
-set -e
+if [ "$INSTALL_DIRECTLY_FROM_GITHUB_RELEASE" = "true" ]; then
+    install_from_github $latest_version $prev_version
+else
+    install_using_go $latest_version $prev_version
+fi
 
-if [ "$exit_code" != "0" ]; then
-    # Handle situation where git tags are ahead of what was is available to actually download
-    echo "(!) air version ${latest_version} failed to download. Attempting to fall back to ${prev_version} to retry..."
-    go install github.com/air-verse/air@v${prev_version}
-fi
+# Clean up
+rm -rf /var/lib/apt/lists/*

src/go-air/utils.sh

@@ -1,5 +1,22 @@
 #!/usr/bin/env bash
 
+# Refresh the local package index if no package list entries are stored on the system.
+apt_get_update() {
+    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+        echo "Running apt-get update..."
+        apt-get update -y
+    fi
+}
+
+# Checks if packages are installed and installs them if not
+check_packages() {
+    if ! dpkg -s "$@" > /dev/null 2>&1; then
+        apt_get_update
+        echo "Installing $@..."
+        apt-get install -y --no-install-recommends $@
+    fi
+}
+
 # Find 2 latest versions that appropriate to requested version
 find_latest_versions() {
     local requested_version=$1