Local part of a simple ipfs replication solution. To be executed by a cronjob

ipfs_sync_local.sh

#!/bin/bash

# Checks the locally pinned files against a previously persisted.
# If something changed, the updated list file is pushed to a given server (needs to be ssh accessible without password).
# Finally, the new list is persisted locally.
# Note that the local ipfs daemon needs to be running in order for the server to be able to fetch.
# The local ipfs config may be restricted to connect only to that server (add as only Bootstrap node and disable discovery).

set -e
set -u

FILE=$HOME/.ipfs/pinned.list
touch $FILE # avoid failure when run first
DEST="youruser@yourhost.yourtld"
# source: https://ipfs.io/ipns/ipfs.git.sexy/sketches/replicate_node.html
LISTCMD="ipfs pin ls -q --type=recursive | sort"
DIFFCMD="diff <(eval $LISTCMD) $FILE > /dev/null"

if ! eval $DIFFCMD; then
  echo "something changed, pushing new list to server..."
  eval $LISTCMD | ssh $DEST "cat > .ipfs/${HOSTNAME}.pinned.list"

  # yeah, here we have a small race condition. The list may have changed in the meantime :-(
  echo "updating local list file..."
  eval $LISTCMD > $FILE
fi

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