From fc5456dc786889af84b789b4ae4d23c85798a0ed Mon Sep 17 00:00:00 2001
From: lhark <lhark@lharktop>
Date: Fri, 15 Feb 2019 18:36:41 -0500
Subject: [PATCH] [mailsync] Add SO credit for locking mechanism

---
 mailsync | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mailsync b/mailsync
index 1d1f411..3dfa0a6 100755
--- a/mailsync
+++ b/mailsync
@@ -5,6 +5,7 @@ maildir=~/mail
 mailboxes=$(find "$maildir" -mindepth 1 -maxdepth 1 -type d ! -name cur ! -name tmp ! -name new ! -name .notmuch -printf '%f\n')
 
 LOCKFILE="/tmp/.mailsync.$USER.lock"
+# https://stackoverflow.com/questions/185451/quick-and-dirty-way-to-ensure-only-one-instance-of-a-shell-script-is-running-at
 # /!\ locking method is susceptible to race condition
 # Should be fine for cron job
 if [ -e "$LOCKFILE" ] && kill -0 "$(cat "$LOCKFILE")"; then