Automatically enable GPG Mail plugin

enable-gpgmail.sh

#!/bin/bash

BUNDLE_NAME="GPGMailLoader_6"
LOADER_BUNDLE="${BUNDLE_NAME:?}.mailbundle"
SIGNED_LOADER_BUNDLE="${BUNDLE_NAME}.signed.mailbundle"
BUNDLES_PATH="/Library/Mail/Bundles"
SIGNED_BUNDLES_PATH="/Library/Application Support/GPGTools/GPGMail"
ENABLED_BUNDLES_PATH="$HOME/Library/Application Support/Mail/Plug-ins/Bundles/${BUNDLE_PATH:?}"
LOADER_BUNDLE_PATH="${BUNDLES_PATH:?}/${LOADER_BUNDLE:?}"
ENABLED_LOADER_BUNDLE_PATH="${ENABLED_BUNDLES_PATH:?}/${LOADER_BUNDLE:?}"
SIGNED_LOADER_BUNDLE_PATH="${SIGNED_BUNDLES_PATH:?}/${SIGNED_LOADER_BUNDLE:?}"

function safe_copy {
  local src="$1"
  local dst="$2"
  
  cp -R "${src:?}" "${src:?}.bak"
  # In order to avoid code signing (stale in-memory cached signature), use mv instead of cp the file.
  mv "${src:?}.bak" "${dst}/"
}

# Create the enabled bundles folder if necessary.
mkdir -p "${ENABLED_BUNDLES_PATH:?}"

# Install the latest loader version in /Library/Mail/Bundles
if [[ -e "${LOADER_BUNDLE_PATH:?}" ]]; then
  rm -rf "${LOADER_BUNDLE_PATH:?}"
fi
safe_copy "${SIGNED_LOADER_BUNDLE_PATH:?}" "${BUNDLES_PATH:?}"

# Remove older *enabled* bundle loader versions.
if [[ -d "${ENABLED_LOADER_BUNDLE_PATH:?}" ]]; then 
  rm -rf "${ENABLED_LOADER_BUNDLE_PATH:?}"
fi
# Install the newest version of the GPG Mail loader bundle.
safe_copy "${SIGNED_LOADER_BUNDLE_PATH:?}" "${ENABLED_BUNDLES_PATH:?}/"