We invite you to preview the contents of the install script. It is written as readable Bash with minimal indirection, to allow you to audit it and potentially customize it to your needs:

#!/bin/sh
set -e

# Check prerequisites:
which curl >/dev/null || (echo "ERROR: curl not found; this script requires curl to run"; exit 1)

# Defaults:
DRY_RUN="${DRY_RUN:-}"
INSTALL_DIR="${INSTALL_DIR:-$HOME/.local/bin}"
INSTALL_VERSION="${INSTALL_VERSION:-latest}"
INSTALL_GOOS="${INSTALL_GOOS:-autodetect}"
INSTALL_GOARCH="${INSTALL_GOARCH:-autodetect}"

# Parse arguments: # https://stackoverflow.com/a/14203146
while [ $# -gt 0 ]; do
    case "$1" in
        --help)
            echo "Usage: $0 [--path \$HOME/.local/bin] [--version latest] [--os autodetect] [--arch autodetect] [--dry-run]"
            echo "Install the latest STACKIT Function CLI binary from GitHub releases"
            exit 1
        ;;
        --path)    INSTALL_DIR="$2"; shift ;;
        --version) INSTALL_VERSION="$2"; shift;;
        --os)      INSTALL_GOOS="$2"; shift;;
        --arch)    INSTALL_GOARCH="$2"; shift;;
        --dry-run) DRY_RUN='1';;
        --*) echo "ERROR: Unknown option $1" && exit 2;;
    esac
    shift || (echo "ERROR: Expected argument"; exit 2)
done

# Resolve OS and architecture:
if [ "$INSTALL_GOOS" = 'autodetect' ]; then
    case "$(uname -s)" in
        darwin | Darwin) INSTALL_GOOS="darwin";;
        linux | Linux) INSTALL_GOOS="linux";;
        *) echo "ERROR: Unknown operating system: $(uname -s)" && exit 3;;
    esac
fi
if [ "$INSTALL_GOARCH" = 'autodetect' ]; then
    case "$(uname -m)" in
        x86_64 | amd64) INSTALL_GOARCH="amd64";;
        aarch64 | arm64) INSTALL_GOARCH="arm64";;
        *) echo "ERROR: Unknown architecture: $(uname -m)" && exit 3;;
    esac
fi

# Resolve latest version:
if [ "$INSTALL_VERSION" = 'latest' ]; then
    INSTALL_VERSION="$(curl --silent https://api.github.com/repos/stackitcloud/sfn-cli/releases/latest | sed -En 's|.+"tag_name": "v([^"]+)".+|\1|p')"
fi

# Construct download URL:
DOWNLOAD_URL="https://github.com/stackitcloud/sfn-cli/releases/download/v${INSTALL_VERSION}/sfn_${INSTALL_VERSION}_${INSTALL_GOOS}_${INSTALL_GOARCH}.tar.gz"

# Download and install:
echo "INFO: Downloading SFN CLI $INSTALL_VERSION from $DOWNLOAD_URL and installing to $INSTALL_DIR"
if [ -z "$DRY_RUN" ]; then
    mkdir -p "$INSTALL_DIR"
    curl -L "$DOWNLOAD_URL" | tar -xz -C "$INSTALL_DIR" sfn
    echo "INFO: Installed SFN CLI to $INSTALL_DIR/sfn!"
else
    echo "INFO: Dry run, skipping installation"
fi

# Check whether PATH contains install dir: # https://unix.stackexchange.com/a/32054
case ":$PATH:" in
*:$INSTALL_DIR:*);;
*)
echo "WARNING: $INSTALL_DIR is not part of your \$PATH"
echo "To use the \`sfn\` command, add export PATH=\"$INSTALL_DIR:\$PATH\" to your ~/.bashrc or ~/.zshrc (or use fish_add_path $INSTALL_DIR)."
echo "Alternatively, call the sfn CLI directly using \`$INSTALL_DIR/sfn\`"
;;
esac