Automates the process of resuming mmctl export downloads

mmctl-export-downloader.sh

#!/bin/bash

# mmctl-export-downloader.sh

## ABOUT
#
# This script automates the process of downloading a very large Mattermost bulk
# exports using mmctl.
#
## USAGE
#
# 1. Install and configure mmctl and make sure it's in your $PATH

# 2. Use mmctl to generate an export by running this command: mmctl export
# create --attachments

# 3. Verify that the export job has completed by running mmctl export job list
# until the export changes from pending to success.

# 4. Find the export filename you want to download , e.g.
# fe7j619ysjbk8qkxwu8jyybohr_export.zip by running: mmctl export list

# 5. Run this script and pass the filename, e.g.: ./mmctl-export-downloader.sh
# fe7j619ysjbk8qkxwu8jyybohr_export.zip

# 6. Wait for the the script to finish. If you see repeated errors press Ctrl+C
# to exit the script


export_filename=$1

if [[ ! -f $export_filename ]]; then
	# If 
	if mmctl export download $export_filename; then
		echo "mmctl export file downloaded!"
		exit 0
	else
		echo "Download interrupted. Resuming..."
		while ! mmctl export download $export_filename --resume; do
			echo "Download interrupted. Resuming..."
		done
		echo "mmctl export file downloaded!"
		exit 0
	fi
else
	echo "File exists, resuming download..."
	while ! mmctl export download $export_filename --resume; do
		echo "Download interrupted. Resuming..."
	done
	echo "mmctl export file downloaded!"
fi