From 4ece4f35be91fa5f7dac644e9038070239302ba9 Mon Sep 17 00:00:00 2001
From: Aaron Ball <nullspoon@oper.io>
Date: Wed, 4 Apr 2018 19:49:14 -0600
Subject: Implemented scheduled writeback

Now we write back to encrypted storage on a loop every 15 seconds. We
also catch SIGINT (Ctrl + c) and execute a clean shutdown process. This
will reduce the likelihood of data loss.
---
 gpgsecure.sh | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/gpgsecure.sh b/gpgsecure.sh
index 0544671..b9796c2 100755
--- a/gpgsecure.sh
+++ b/gpgsecure.sh
@@ -19,6 +19,7 @@
 export KEY=${KEY:-} # GPG key to encrypt the container with
 export DIR          # Directory path to present the gpg archive to
 export TMP          # Temp directory in memory to decrypt to
+trap shutdown SIGINT
 
 shutdown() {
   printf '\nRe-encrypting for shutdown\n'
@@ -30,6 +31,21 @@ shutdown() {
   rm "${DIR}"
   # Delete the temp dir from memory
   rm -rf "${TMP}"
+  sync
+  exit
+}
+
+writeback() {
+  while [ 0 ]; do
+    printf '%s   Syncing back to encrypted storage\n' "$(date '+%F %T')"
+    tar -C "${TMP}" -c . | gpg -e --recipient "${KEY}" > "${DIR}.tar.gpg"
+    if [ $? -gt 0 ]; then
+      printf 'WARNING: Something went wrong syncing back to encrypted storage\n'
+      printf 'Your data is likely in danger.\n'
+      printf 'If you see this message more than once, take a manual backup\n'
+    fi
+    sleep 15
+  done
 }
 
 main() {
@@ -65,11 +81,10 @@ main() {
     gpg -d ${DIR}.tar.gpg | tar -C "${TMP}" -x
   fi
 
-  printf 'Do some secure work and press enter to re-encrypt when done\n'
-  read
-
+  writeback
   shutdown
   return $?
 }
 
 main ${@}
+
-- 
cgit v1.2.3