replace_tracker.sh update transmission client torrents matching tracker string with new tracker URL

gistfile2.txt

#!/bin/bash
# Borrowed from https://gist.github.com/Adadov/e352c05cf2f90031e5b9b623509a02da

GNU='/usr/local/bin/gsed'

if [ "$(uname)" == "Darwin" ]; then
    echo "macOS detected. Using GNU sed instead of built-in."
        if [[ -f "$GNU" ]]; then
            echo "GNU sed found at $GNU."
	    SED=${GNU}
	    echo "sed is now set to $GNU"
                else
                echo "GNU sed not found. Exiting."
		exit 1
        fi
    else
    echo "Not running macOS. We have a real sed."
    SED=$(command -v sed)
fi


# Announce key
KEY=""

# Transmission daemon host
HOST="localhost:9091"

# Authentication to transmission-daemon (1 = True ; 0 = False)
AUTH=1
TDUSER="admin"
TDPASS="secret"

if [ ${AUTH} -eq 1 ]; then
	OPTS="${HOST} -n ${TDUSER}:${TDPASS}"
else
	OPTS="${HOST}"
fi

# Tracker to replace
OLD="old.example.com"
# New tracker URL https://
NEW="https://new.example.com"

if [ -z ${KEY+x} ]; then
    echo "KEY is unset";
    exit 1
    else
    echo "KEY is set to '$KEY'"
fi

# Get all torrents ID
LISTID=$(transmission-remote ${OPTS} -l | awk '{print $1}' | grep -E '^[0-9]+' | $SED -r -e 's/^([0-9]*).*$/\1/')

for id in ${LISTID}; do
	echo "========================="
	TRACKS=$(transmission-remote ${OPTS} -t ${id} -it | grep -E 'Tracker [0-9]+') # Get all trackers
	TRTEST=$(echo "${TRACKS}" | grep ${OLD}) # Is there the tracker to replace ?
	if [ $? -eq 0 ]; then
		TRKID=$(echo "${TRACKS}" | grep ${OLD} | $SED -r -e 's/Tracker ([0-9]+).*/\1/') # Get tracker ID
		transmission-remote ${OPTS} -t ${id} -tr ${TRKID}
		transmission-remote ${OPTS} -t ${id} -td "${NEW}/${KEY}/announce"
	fi
done

exit 0