added fly cli

Author: patrickcrocker

src/fly-cli/devcontainer-feature.json

@@ -0,0 +1,15 @@
+{
+    "name": "Concourse Fly CLI",
+    "id": "fly-cli",
+    "version": "1.0.0",
+    "description": "Installs the Concourse Fly CLI.",
+    "options": {
+        "url": {
+            "type": "string",
+            "description": "Concourse URL to download the Fly CLI from"
+        }
+    },
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/common-utils"
+    ]
+}

src/fly-cli/install.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+: ${URL:=https://ci.nulldriver.com}
+
+USERNAME=${USERNAME:-${_REMOTE_USER:-"automatic"}}
+
+set -e
+
+export TMPDIR=$(mktemp -d /tmp/feature.XXXXXX)
+trap "rm -rf $TMPDIR" EXIT
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+    exit 1
+fi
+
+architecture="$(dpkg --print-architecture)"
+if [ "${architecture}" != "amd64" ] && [ "${architecture}" != "arm64" ]; then
+    echo "(!) Architecture $architecture unsupported"
+    exit 1
+fi
+
+# Determine the appropriate non-root user
+if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
+    USERNAME=""
+    POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
+        if id -u "${CURRENT_USER}" >/dev/null 2>&1; then
+            USERNAME=${CURRENT_USER}
+            break
+        fi
+    done
+    if [ "${USERNAME}" = "" ]; then
+        USERNAME=root
+    fi
+elif [ "${USERNAME}" = "none" ] || ! id -u ${USERNAME} >/dev/null 2>&1; then
+    USERNAME=root
+fi
+
+apt_get_update() {
+    if [ "$(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 "$@" >/dev/null 2>&1; then
+        apt_get_update
+        apt-get -y install --no-install-recommends "$@"
+    fi
+}
+
+export DEBIAN_FRONTEND=noninteractive
+
+### BEGIN install
+
+# Soft version matching
+check_packages curl ca-certificates
+echo "Downloading fly..."
+curl -SL "$URL/api/v1/cli?arch=amd64&platform=linux" -o "$TMPDIR/fly"
+install "$TMPDIR/fly" /usr/local/bin/fly
+
+### END install
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
+echo "Done!"

test/fly-cli/test.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# This test can be run with the following command (from the root of this repo)
+# devcontainer features test --features fly-cli --base-image mcr.microsoft.com/devcontainers/base:ubuntu .
+
+set -e
+
+# Import 'check' command
+source dev-container-features-test-lib
+
+check "version" fly -version
+
+reportResults