install

#!/usr/bin/env bash
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

# installed-datastore-version reports the version a binary says it is, and nothing
# at all when there is no such file or it cannot be run.
installed-datastore-version() {
  declare BINARY="$1"

  if [[ ! -x "$BINARY" ]]; then
    return 0
  fi

  # a file that is executable but is not this binary exits non-zero, and under
  # errexit the assignment that takes this would end the install saying nothing.
  # Reporting no version is the useful answer: it is what a caller checks for.
  "$BINARY" version 2>/dev/null | head -n1 | tr -d '[:space:]' || true
}

plugin-install() {
  local ARCHITECTURE="amd64"
  if [[ "$(uname -m)" == "aarch64" ]]; then
    ARCHITECTURE="arm64"
  fi

  local DOKKU_DATASTORE_ROOT="${DOKKU_LIB_ROOT}/data/${PLUGIN_COMMAND_PREFIX}"
  local DOKKU_DATASTORE_BINARY="${DOKKU_DATASTORE_ROOT}/dokku-datastore-${DOKKU_DATASTORE_VERSION}"
  local DOKKU_DATASTORE_LOCAL="${DOKKU_DATASTORE_ROOT}/dokku-datastore.local"
  local DOKKU_DATASTORE_URL="https://github.com/dokku/dokku-datastore/releases/download/${DOKKU_DATASTORE_VERSION}/dokku-datastore-linux-${ARCHITECTURE}"

  # the binary has to be in place before anything else, because the rest of the
  # install is the binary's own trigger-install command
  mkdir -p "$DOKKU_DATASTORE_ROOT" || dokku_log_fail "Unable to create the ${PLUGIN_COMMAND_PREFIX} plugin data directory"
  chown -R "${DOKKU_SYSTEM_USER}:${DOKKU_SYSTEM_GROUP}" "$DOKKU_DATASTORE_ROOT"

  # a binary staged here wins over the pinned release, so that an unreleased
  # build can be tested against this plugin. stage one with
  # `make setup DOKKU_DATASTORE_BINARY=/path/to/dokku-datastore`
  if [[ -x "$DOKKU_DATASTORE_LOCAL" ]]; then
    dokku_log_info1_quiet "Installing dokku-datastore from ${DOKKU_DATASTORE_LOCAL}"
    cp "$DOKKU_DATASTORE_LOCAL" "${DOKKU_DATASTORE_ROOT}/dokku-datastore"
    chmod +x "${DOKKU_DATASTORE_ROOT}/dokku-datastore"
    "${DOKKU_DATASTORE_ROOT}/dokku-datastore" trigger-install "$PLUGIN_COMMAND_PREFIX"
    return
  fi

  # the binary is asked what it is rather than believed on the strength of its
  # filename. A truncated download, a binary for the wrong architecture, one left
  # by hand, or a release that was re-tagged all look correct to a name check and
  # would then be used for as long as the version stayed pinned
  if [[ "$(installed-datastore-version "$DOKKU_DATASTORE_BINARY")" != "$DOKKU_DATASTORE_VERSION" ]]; then
    dokku_log_info1_quiet "Installing dokku-datastore@${DOKKU_DATASTORE_VERSION}"

    # download to a temporary path so that a failed request cannot leave a file
    # behind that the check above would take for an installed binary
    if ! curl -sSL --fail "${DOKKU_DATASTORE_URL}" -o "${DOKKU_DATASTORE_BINARY}.download"; then
      rm -f "${DOKKU_DATASTORE_BINARY}.download"
      dokku_log_fail "Unable to download dokku-datastore@${DOKKU_DATASTORE_VERSION} from ${DOKKU_DATASTORE_URL}"
    fi

    # made executable before it is asked its version, because curl writes it
    # without the bit and a file that cannot run reports nothing
    chmod +x "${DOKKU_DATASTORE_BINARY}.download"

    local DOWNLOADED_VERSION
    DOWNLOADED_VERSION="$(installed-datastore-version "${DOKKU_DATASTORE_BINARY}.download")"
    if [[ "$DOWNLOADED_VERSION" != "$DOKKU_DATASTORE_VERSION" ]]; then
      rm -f "${DOKKU_DATASTORE_BINARY}.download"
      dokku_log_fail "Downloaded dokku-datastore reports '${DOWNLOADED_VERSION}' rather than ${DOKKU_DATASTORE_VERSION}"
    fi

    mv "${DOKKU_DATASTORE_BINARY}.download" "$DOKKU_DATASTORE_BINARY"
  fi

  cp "$DOKKU_DATASTORE_BINARY" "${DOKKU_DATASTORE_ROOT}/dokku-datastore"
  chmod +x "${DOKKU_DATASTORE_ROOT}/dokku-datastore"

  "${DOKKU_DATASTORE_ROOT}/dokku-datastore" trigger-install "$PLUGIN_COMMAND_PREFIX"
}
plugin-install "$@"