channel option

Author: eitsupi

src/dart/_common.sh

@@ -9,8 +9,14 @@ apt_get_update() {
 
 # Checks if packages are installed and installs them if not
 check_packages() {
-    if ! dpkg -s "$@" > /dev/null 2>&1; then
+    if ! dpkg -s "$@" >/dev/null 2>&1; then
         apt_get_update
         apt-get -y install --no-install-recommends "$@"
     fi
 }
+
+check_git() {
+    if [ ! -x "$(command -v git)" ]; then
+        check_packages git
+    fi
+}

src/dart/devcontainer-feature.json

@@ -5,9 +5,16 @@
   "version": "1.0.0",
   "options": {
     "version": {
-      "description": "Dart version",
+      "description": "Select version of Dart SDK",
       "type": "string",
-      "default": "latest"
+      "default": "latest",
+      "proposals": ["latest", "3"]
+    },
+    "channel": {
+      "description": "Select build channel of Dart SDK",
+      "type": "string",
+      "default": "stable",
+      "enum": ["stable", "beta", "dev", "main"]
     }
   },
   "containerEnv": {

src/dart/install.sh

@@ -1,41 +1,93 @@
 #!/usr/bin/env bash
 
 VERSION=${VERSION:-"latest"}
+CHANNEL=${CHANNEL:-"stable"}
 
 DART_SDK="/usr/lib/dart"
 
 set -e
 source _common.sh
 
 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
+    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
+    echo "(!) Architecture $architecture unsupported"
+    exit 1
 fi
 
 # Clean up
 rm -rf /var/lib/apt/lists/*
 
+find_version_from_git_tags() {
+    local variable_name=$1
+    local requested_version=${!variable_name}
+    if [ "${requested_version}" = "none" ]; then return; fi
+    local repository=$2
+    local prefix=${3:-"tags/v"}
+    local separator=${4:-"."}
+    local last_part_optional=${5:-"false"}
+    if [ "$(echo "${requested_version}" | grep -o "." | wc -l)" != "2" ]; then
+        local escaped_separator=${separator//./\\.}
+        local last_part
+        if [ "${last_part_optional}" != "false" ]; then
+            last_part="(${escaped_separator}[0-9]+)*.*${last_part_optional}"
+        else
+            last_part="${escaped_separator}[0-9]+"
+        fi
+        local regex="${prefix}\\K[0-9]+${escaped_separator}[0-9]+${last_part}$"
+        local version_list
+        check_git
+        check_packages ca-certificates
+        version_list="$(git ls-remote --tags "${repository}" | grep -oP "${regex}" | tr -d ' ' | tr "${separator}" "." | sort -rV)"
+        if [ "${requested_version}" = "latest" ] || [ "${requested_version}" = "current" ] || [ "${requested_version}" = "lts" ]; then
+            declare -g "${variable_name}"="$(echo "${version_list}" | head -n 1)"
+        else
+            set +e
+            declare -g "${variable_name}"="$(echo "${version_list}" | grep -E -m 1 "^${requested_version//./\\.}([\\.\\s]|$)")"
+            set -e
+        fi
+    fi
+    if [ -z "${!variable_name}" ] || ! echo "${version_list}" | grep "^${!variable_name//./\\.}$" >/dev/null 2>&1; then
+        echo -e "Invalid ${variable_name} value: ${requested_version}\nValid values:\n${version_list}" >&2
+        exit 1
+    fi
+    echo "${variable_name}=${!variable_name}"
+}
+
 export DEBIAN_FRONTEND=noninteractive
 
 check_packages curl ca-certificates unzip
 
 case "$architecture" in
 amd64)
-  SDK_ARCH="x64"
-  ;;
+    SDK_ARCH="x64"
+    ;;
 arm64)
-  SDK_ARCH="arm64"
-  ;;
+    SDK_ARCH="arm64"
+    ;;
 esac
 
-if [ "${VERSION}" = "latest" ]; then
-  URL="https://storage.googleapis.com/dart-archive/channels/be/raw/latest/sdk/dartsdk-linux-${SDK_ARCH}-release.zip"
+if [ "${CHANNEL}" = "main" ]; then
+    URL="https://storage.googleapis.com/dart-archive/channels/be/raw/latest/sdk/dartsdk-linux-${SDK_ARCH}-release.zip"
+else
+    if [ "${CHANNEL}" = "stable" ]; then
+        LAST_PART="false"
+    elif [ "${CHANNEL}" = "beta" ]; then
+        LAST_PART="beta"
+    elif [ "${CHANNEL}" = "dev" ]; then
+        LAST_PART="dev"
+    else
+        echo "(!) Channel ${CHANNEL} unsupported"
+        exit 1
+    fi
+    # Soft version matching
+    find_version_from_git_tags VERSION "https://github.com/dart-lang/sdk" "tags/v" "." "${LAST_PART}"
+
+    URL="https://storage.googleapis.com/dart-archive/channels/${CHANNEL}/release/${VERSION}/sdk/dartsdk-linux-${SDK_ARCH}-release.zip"
 fi
 
 echo "Downloading Dart..."