Restoring ReMarkable Pro on Linux

#!/bin/bash
# See https://developer.remarkable.com/documentation/recovery-for-linux-host

set -o errexit
set -o nounset
set -o pipefail

PAPER_PRO_VENDOR_ID="1fc9:0134"
RECOVER_TOOL_DEST_PATH="$HOME/bin/rm_recover"
RECOVERY_TOOL_URL_PREFIX="https://device-recovery.cloud.remarkable.com/host/"
RECOVERY_TOOL_URL_POSTFIX="/x86_64-unknown-linux-gnu-public/bin/rm_recover"
KNOWN_VERSION="1.14.1"
KNOWN_SHA="2e835990e57737b2c780be7660608cf1eed22a9d87a0014656a2ef0a20b14662"


get_latest_version() {
    local version_data \
        major_version \
        minor_version \
        patch_version
    version_data=$(rm_recover check-version | grep 'Latest release')
    major_version=$(echo "$version_data"| grep -o -P '(?<=major: )[^,]*')
    minor_version=$(echo "$version_data"| grep -o -P '(?<=minor: )[^,]*')
    patch_version=$(echo "$version_data"| grep -o -P '(?<=patch: )[^ }]*')
    echo "$major_version.$minor_version.$patch_version"
}


get_current_version() {
    local version_data \
        major_version \
        minor_version \
        patch_version
    version_data=$(rm_recover check-version | grep 'This version')
    major_version=$(echo "$version_data"| grep -o -P '(?<=major: )[^,]*')
    minor_version=$(echo "$version_data"| grep -o -P '(?<=minor: )[^,]*')
    patch_version=$(echo "$version_data"| grep -o -P '(?<=patch: )[^ }]*')
    echo "$major_version.$minor_version.$patch_version"
}


check_in_development_mode() {
    lsusb | grep -q "$PAPER_PRO_VENDOR_ID"
}

download_recovery_tool() {
    local version="${1?No version passed}"
    local sha="${2:-}"
    echo "Downloading recovery tool..."
    curl "$RECOVERY_TOOL_URL_PREFIX$version$RECOVERY_TOOL_URL_POSTFIX" -o "$RECOVER_TOOL_DEST_PATH"
    sha256sum rm_recover | grep -q "$sha" || {
        cat <<EOH
ERROR: Failed to verify the download of the recovery tool, maybe the sha changed?

You can try checking the webpage for updates
     https://developer.remarkable.com/documentation/recovery-for-linux-host

Got downloaded tool sha:
$(sha256sum rm_recover)

Expected tool sha:
$sha
EOH
        exit 1
    }
}

install() {
    local version="${1:-$KNOWN_VERSION}"
    local sha="${2:-}"
    download_recovery_tool "$version" "$sha"
    chmod u+x rm_recover
    echo "Downloading uuu and other tools, the recovery tool will fail this first time"
    rm_recover restore 2>/dev/null 1>&2|| :
    artifacts_dir=$(rm_recover artifacts | grep 'Artifacts dir: ' | grep -o '/.*')
    echo -e "\n\nGot artifacts in $artifacts_dir, adding uuu to the path"
    [[ -f /usr/local/bin/uuu ]] || sudo ln -s "$artifacts_dir/uuu" /usr/local/bin/uuu
    echo "Remarkable tools installed."
}


main() {
    if ! command -v rm_recover; then
        install "$KNOWN_VERSION" "$KNOWN_SHA"
    else
        echo "Using already installed rm_recover"
    fi

    echo "Checking for updates"
    latest_version=$(get_latest_version)
    current_version=$(get_current_version)
    if [[ "$latest_version" != "$current_version" ]]; then
        echo "Found a newer version, want to upgrade it? [y/n]"
        read response
        if [[ "$response" =~ ^[yY] ]]; then
            echo "Upgrading to $latest_version"
            install "$latest_version" ""
        fi
    else
        echo "   already in the latest version $current_version"
    fi

    sudo $(which rm_recover) "$@"
}


main "$@"