Add schpet-linear-cli devcontainer feature

src/schpet-linear-cli/NOTES.md

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+# schpet-linear-cli
+
+## Project
+
+- [linear-cli](https://github.com/schpet/linear-cli)
+
+## Description
+
+A command-line interface for [Linear](https://linear.app/), the project management tool. `linear` lets you interact with your Linear workspace from the terminal, including listing and viewing issues, and integrating with Git workflows.
+
+## Installation Method
+
+Downloaded as a pre-compiled binary from the [GitHub releases page](https://github.com/schpet/linear-cli/releases) and placed in `/usr/local/bin`.
+
+## Other Notes
+
+_No additional notes._

src/schpet-linear-cli/devcontainer-feature.json

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+{
+    "name": "schpet-linear-cli",
+    "id": "schpet-linear-cli",
+    "version": "1.0.0",
+    "description": "Install \"linear\" binary",
+    "documentationURL": "https://github.com/devcontainer-community/devcontainer-features/tree/main/src/schpet-linear-cli",
+    "options": {
+        "version": {
+            "type": "string",
+            "default": "latest",
+            "proposals": ["latest"],
+            "description": "Version of \"linear\" to install."
+        }
+    }
+}

src/schpet-linear-cli/install.sh

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+#!/bin/bash
+set -o errexit
+set -o pipefail
+set -o noclobber
+set -o nounset
+set -o allexport
+readonly githubRepository='schpet/linear-cli'
+readonly binaryName='linear'
+readonly binaryTargetFolder='/usr/local/bin'
+readonly name="${githubRepository##*/}"
+apt_get_update() {
+    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+        echo "Running apt-get update..."
+        apt-get update -y
+    fi
+}
+apt_get_checkinstall() {
+    if ! dpkg -s "$@" >/dev/null 2>&1; then
+        apt_get_update
+        DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends --no-install-suggests --option 'Debug::pkgProblemResolver=true' --option 'Debug::pkgAcquire::Worker=1' "$@"
+    fi
+}
+apt_get_cleanup() {
+    apt-get clean
+    rm -rf /var/lib/apt/lists/*
+}
+check_curl_file_tar_xz_installed() {
+    declare -a requiredAptPackagesMissing=()
+    if ! [ -r '/etc/ssl/certs/ca-certificates.crt' ]; then
+        requiredAptPackagesMissing+=('ca-certificates')
+    fi
+    if ! command -v curl >/dev/null 2>&1; then
+        requiredAptPackagesMissing+=('curl')
+    fi
+    if ! command -v file >/dev/null 2>&1; then
+        requiredAptPackagesMissing+=('file')
+    fi
+    if ! command -v tar >/dev/null 2>&1; then
+        requiredAptPackagesMissing+=('tar')
+    fi
+    if ! command -v xz >/dev/null 2>&1; then
+        requiredAptPackagesMissing+=('xz-utils')
+    fi
+    declare -i requiredAptPackagesMissingCount=${#requiredAptPackagesMissing[@]}
+    if [ $requiredAptPackagesMissingCount -gt 0 ]; then
+        apt_get_update
+        apt_get_checkinstall "${requiredAptPackagesMissing[@]}"
+        apt_get_cleanup
+    fi
+}
+curl_check_url() {
+    local url=$1
+    local status_code
+    status_code=$(curl -s -o /dev/null -w '%{http_code}' "$url")
+    if [ "$status_code" -ne 200 ] && [ "$status_code" -ne 302 ]; then
+        echo "Failed to download '$url'. Status code: $status_code."
+        return 1
+    fi
+}
+curl_download_stdout() {
+    local url=$1
+    curl \
+        --silent \
+        --location \
+        --output '-' \
+        --connect-timeout 5 \
+        "$url"
+}
+curl_download_untar_xz() {
+    local url=$1
+    local strip=$2
+    local target=$3
+    local bin_path=$4
+    curl_download_stdout "$url" | tar \
+        -xJ \
+        -f '-' \
+        --strip-components="$strip" \
+        -C "$target" \
+        "$bin_path"
+}
+debian_get_arch() {
+    echo "$(dpkg --print-architecture)"
+}
+debian_get_target_arch() {
+    case $(debian_get_arch) in
+    amd64) echo 'x86_64' ;;
+    arm64) echo 'aarch64' ;;
+    *)
+        printf >&2 '=== [ERROR] Unsupported architecture: "%s"!\n' "$(debian_get_arch)"
+        exit 1
+        ;;
+    esac
+}
+echo_banner() {
+    local text="$1"
+    echo -e "\e[1m\e[97m\e[41m$text\e[0m"
+}
+github_list_releases() {
+    if [ -z "$1" ]; then
+        echo "Usage: list_github_releases <owner/repo>"
+        return 1
+    fi
+    local repo="$1"
+    local url="https://api.github.com/repos/$repo/releases"
+    curl -s "$url" | grep -Po '"tag_name": "\K.*?(?=")' | grep -E '^v?[0-9]+\.[0-9]+\.[0-9]+$' | sed 's/^v//'
+}
+github_get_latest_release() {
+    if [ -z "$1" ]; then
+        echo "Usage: get_latest_github_release <owner/repo>"
+        return 1
+    fi
+    github_list_releases "$1" | head -n 1
+}
+github_get_tag_for_version() {
+    if [ -z "$1" ] || [ -z "$2" ]; then
+        echo "Usage: github_get_tag_for_version <owner/repo> <version>"
+        return 1
+    fi
+    local repo="$1"
+    local version="$2"
+    local url="https://api.github.com/repos/$repo/releases"
+    local escaped_version
+    escaped_version="$(printf '%s' "$version" | sed 's/\./\\./g')"
+    curl -s "$url" | grep -Po '"tag_name": "\K.*?(?=")' | grep -E "^v?${escaped_version}$" | head -n 1
+}
+utils_check_version() {
+    local version=$1
+    if ! [[ "${version:-}" =~ ^(latest|[0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
+        printf >&2 '=== [ERROR] Option "version" (value: "%s") is not "latest" or valid semantic version format "X.Y.Z" !\n' \
+            "$version"
+        exit 1
+    fi
+}
+install() {
+    utils_check_version "$VERSION"
+    check_curl_file_tar_xz_installed
+    readonly architecture="$(debian_get_target_arch)"
+    readonly binaryTargetPath="${binaryTargetFolder}/${binaryName}"
+    if [ "$VERSION" == 'latest' ] || [ -z "$VERSION" ]; then
+        VERSION=$(github_get_latest_release "$githubRepository")
+    fi
+    readonly version="${VERSION:?}"
+    readonly releaseTag="$(github_get_tag_for_version "$githubRepository" "$version")"
+    if [ -z "$releaseTag" ]; then
+        printf >&2 '=== [ERROR] Could not find release tag for version "%s" in "%s"!\n' "$version" "$githubRepository"
+        exit 1
+    fi
+    readonly downloadUrl="https://github.com/${githubRepository}/releases/download/${releaseTag}/${binaryName}-${architecture}-unknown-linux-gnu.tar.xz"
+    curl_check_url "$downloadUrl"
+    readonly binaryPathInArchive="${binaryName}-${architecture}-unknown-linux-gnu/${binaryName}"
+    readonly stripComponents="$(echo -n "$binaryPathInArchive" | awk -F'/' '{print NF-1}')"
+    curl_download_untar_xz "$downloadUrl" "$stripComponents" "$binaryTargetFolder" "$binaryPathInArchive"
+    chmod 755 "$binaryTargetPath"
+    apt_get_cleanup
+}
+echo_banner "devcontainer.community"
+echo "Installing $name..."
+install "$@"
+echo "(*) Done!"

test/schpet-linear-cli/test.sh

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+#!/bin/bash
+set -e
+
+# Import test library from devcontainer CLI
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "execute command" bash -c "linear --version"
+
+# Report results
+reportResults