install.sh

#!/usr/bin/env bash

PREFIX=${PREFIX:-/usr/local}

set -eo pipefail

if ! which gh >/dev/null; then
    echo "gh is not installed. Please install gh and try again."
    echo "See https://github.com/cli/cli"
    exit 1
fi

# Determine the machine operating system
os=""
case "$(uname -s)" in
Darwin)
    os="darwin"
    ;;
Linux)
    os="linux"
    ;;
CYGWIN*)
    os="windows"
    ;;
MINGW*)
    os="windows"
    ;;
*)
    echo "error: unknown os '$(uname -s)'"
    exit 1
    ;;
esac

# Determine the machine architecture
arch="amd64"
case "$os" in
darwin)
    if [ -f /sys/devices/platform/soc/soc:firmware/soc:firmware/vendor ]; then
        vendor=$(cat /sys/devices/platform/soc/soc:firmware/soc:firmware/vendor)
        if [ "$vendor" = "Apple" ]; then
            arch="arm64"
        fi
    fi
    ;;
linux)
    if [ -f /proc/cpuinfo ]; then
        if grep -q "aarch64" /proc/cpuinfo; then
            arch="arm64"
        fi
    else
        case "$(uname -m)" in
        x86_64)
            arch="amd64"
            ;;
        i686)
            arch="386"
            ;;
        *)
            echo "error: unknown architecture '$(uname -m)'"
            exit 1
            ;;
        esac
    fi
    ;;
windows)
    case "$(uname -m)" in
    x86_64)
        arch="amd64"
        ;;
    i686)
        arch="386"
        ;;
    *)
        echo "error: unknown architecture '$(uname -m)'"
        exit 1
        ;;
    esac
    ;;
esac

# Install the latest release of the binary
(
    # Create a temporary working directory
    tmpdir=$(mktemp -d -t dependabot-install-XXXXXX)
    cd "${tmpdir}" || exit 1
    trap 'rm -rf ${tmpdir}' EXIT

    # Download the release artifact
    gh release download -R dependabot/cli -p "*${os}-${arch}.tar.gz" || exit 1

    # Extract the release from the archive
    for file in *.tar.gz; do
        tar xzvf "${file}" >/dev/null 2>&1
        rm "${file}"
    done

    # Check that the dependabot executable exists
    if [ ! -f dependabot ]; then
        echo "dependabot executable not found in release"
        exit 1
    fi

    # Install the dependabot executable
    if install ./dependabot "${PREFIX}/bin"; then
        echo "dependabot installed successfully to ${PREFIX}/bin"
        exit 0
    else
        echo "Couldn't install dependabot to ${PREFIX}/bin."
        echo "You may need to run this script as root."
        exit 1
    fi
)