OpenHaystack Mailbundle compat, codesign and whitelisting fix

openhaystack-fix-compat.sh

#!/usr/bin/env bash
#
# Inspired by https://gist.github.com/avarayr/2490e4f83f1781ebef440c2dc5089235
# as found via https://github.com/rileytestut/AltStore/issues/905#issuecomment-1025092704
#
# Also interesting is "force mail to re-initialize the plugin" from:
# - https://old.reddit.com/r/AltStore/comments/om3z64/solution_to_incompatible_mail_plugin_for_macos/
# (for me, this wasn't necessary to get things working)
#
# NOTE: If you get "Operation not permitted" while attempting to access files below ~/Library/Mail
#       then go to System preferences > Security & Privacy > Privacy, scroll down and select
#       "Full disk access".  Click "+" and add /Applications/Utilities/Terminal.app.
#       After restarting Terminal.app, this script should be able to access files below ~/Library/Mail.
#

set -euo pipefail
OS_PVER=$(sw_vers -productVersion|cut -d. -f1-2)
MAIL_PLUGIN_COMPAT_UUID=$(cat /System/Applications/Mail.app/Contents/Info.plist | grep -A1 "PluginCompatibilityUUID" | grep string | sed -e 's/[[:space:]]<string>//' -e 's/<\/string>//')
MB_PATH=~/Library/Mail/Bundles/OpenHaystackMail.mailbundle
MB_PLIST=$MB_PATH/Contents/Info.plist
TMPFILE=$(mktemp /tmp/openhaystack.XXXXXX)

if [ ! -x /usr/bin/codesign ]; then
	echo ">>> ERROR: The  codesign  utility is missing"
	echo ">>> Paste the following command into your Terminal.app session to install the Xcode command line tools"
	echo
	echo "xcode-select install"
	echo
	echo ">>> Once the tools have been installed, re-run this script."
	exit 0
fi

echo "macOS version (major, minor):       $OS_PVER"
echo "Mail.app plugin compatibility UUID: $MAIL_PLUGIN_COMPAT_UUID"
echo
echo "Mai bundle claims to support the following plugin compatibility UUIDs:"
/usr/libexec/Plistbuddy -c "Print Supported${OS_PVER}PluginCompatibilityUUIDs" $MB_PLIST | tee "$TMPFILE"
echo
if ! grep -q "${MAIL_PLUGIN_COMPAT_UUID}" "${TMPFILE}"; then
	echo ">>> Problem: ${MB_PLIST} does not claim to be compatible with ${MAIL_PLUGIN_COMPAT_UUID}"
	echo ">>> Using  PlistBuddy  to update compatibility list in ${MB_PLIST}"
	/usr/libexec/PlistBuddy -c "Add :Supported${OS_PVER}PluginCompatibilityUUIDs: string ${MAIL_PLUGIN_COMPAT_UUID}" "${MB_PLIST}"
	echo ">>> Using  codesign  to update code-signature on ${MB_PATH}"
	codesign -f -s - "${MB_PATH}"
else
	echo ">>> OK, ${MB_PLIST} already claims to be compatible with ${MAIL_PLUGIN_COMPAT_UUID}"
fi
rm "${TMPFILE}"
echo
echo ">>> Using  sudo spctl  to whitelist the mailbundle in GateKeeper (you might be asked to enter your login password)..."
echo
set -x
sudo spctl --add --label 'Allow OpenHaystack Mail.app plugin to load' ${MB_PATH}
set +x
echo
echo ">>> Finally, open Mail.app and goto Preferences > General > Manage plugins and check the OpenHaystackMail.mailbundle plugin."