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|
#!/bin/sh
#
# Copyright (c) 2017 Aaron LI <aly@aaronly.me>
# MIT license
#
# Get new mails and sync IMAP folders using `mbsync` with `cron`.
#
# Since the passwords are managed using `pass` which encrypts them using
# `gpg`, therefore, `gpg-agent` will be periodically triggered to ask user
# for the passphrase to decrypt the stored passwords, which is annoying
# for the cron tasks.
#
# Workaround the `gpg-agent` asking for passphrase by testing its current
# status about the cached passphrase, i.e., with *pinentry* disabled
# (by passing the `--pinentry-mode error` to `gpg`), invoke `gpg` to try
# to sign a message, if it succeed, then the necessary passphrase has
# already been cached by `gpg-agent`.
#
# Reference:
# * Programmatically determine if gpg-agent will ask for passphrase
# https://superuser.com/a/1212720/731908
#
# Aaron LI
# 2017-05-28
#
set -e
umask 027
# Workaround to make `notify-send` work with cron
# Credit: https://stackoverflow.com/a/16520076
export DISPLAY=:0
export XAUTHORITY="${HOME}/.Xauthority"
PROG="${0##*/}"
LOGFILE="/dev/null"
# The GPG key used by `pass`
GPG_KEY="aly@aaronly.me"
# Command to send notification
NOTIFY_CMD="notify-send"
error() {
echo "$*" >&2
}
log() {
echo "[$(date --iso-8601=seconds)] $*" >> ${LOGFILE}
}
exists() {
command -v "$1" >/dev/null 2>&1
}
# Check if a process id (PID) exists
# Credit: https://stackoverflow.com/a/3044045
is_running() {
kill -0 "$1" >/dev/null 2>&1
}
notify() {
local message="$1"
if exists ${NOTIFY_CMD}; then
command ${NOTIFY_CMD} ${PROG} "${message}"
fi
}
usage() {
error "usage: ${PROG} <account>"
error ""
error "available accounts:"
error " * aly"
error " * weitian"
error " * webmaster"
error " * autistici"
error " * lavabit"
error " * outlook-aly"
error " * outlook-li"
error " * gmail-aly"
error " * gmail-li"
error " * sjtu"
error " * foxmail"
}
# Check whether `gpg-agent` already cached the needed passphrase,
# if return 0 (i.e., success), then the passphrase is already cached,
# then `pass` can decrypt the password without triggering `gpg-agent`
# to ask user for the passphrase.
check_cached_passphrase() {
local key="$1"
echo "test" | \
gpg2 --sign --batch --no-tty --pinentry-mode error \
--local-user ${key} -o /dev/null >/dev/null 2>&1
}
case "$1" in
aly|weitian|webmaster)
ACCOUNT="$1"
;;
autistici)
ACCOUNT="$1"
;;
lavabit)
ACCOUNT="$1"
;;
outlook-aly|outlook-li)
ACCOUNT="$1"
;;
gmail-aly|gmail-li)
ACCOUNT="$1"
;;
sjtu)
ACCOUNT="$1"
;;
foxmail)
ACCOUNT="$1"
;;
-h|--help)
usage
exit 1
;;
*)
error "Invalid account name!"
usage
exit 1
;;
esac
# PID file for `mbsync`, which may just hang and lock the mailbox
PIDFILE="${HOME}/.cache/mbsync.${ACCOUNT}.pid"
# Log file to record the sync information
LOGFILE="${HOME}/.cache/mbsync.${ACCOUNT}.log"
[ ! -f ${LOGFILE} ] && touch ${LOGFILE}
log "-----------------------------------"
if ! check_cached_passphrase ${GPG_KEY}; then
log "GPG passphrase not cached! Skip sync mail."
notify "GPG passphrase not cached! Skip sync mail."
exit 2
fi
if [ -f "${PIDFILE}" ]; then
PID=$(cat ${PIDFILE})
if is_running ${PID} && ! kill ${PID} >/dev/null 2>&1; then
log "Cannot kill process: ${PID}"
notify "Cannot kill process: ${PID}"
fi
fi
log "Sync mail for account: ${ACCOUNT} ..."
notify "Sync mail for account: ${ACCOUNT} ..."
mbsync -V "${ACCOUNT}" >>${LOGFILE} 2>&1 &
#sleep 10 &
PID=$!
echo ${PID} > ${PIDFILE}
wait ${PID}
rm ${PIDFILE}
log "Finish syncing mail for account: ${ACCOUNT}!"
notify "Finish syncing mail for account: ${ACCOUNT}!"
|
