Enable DELETE on fortrabbit Universal Apps

rsync-fortrabbit.sh

#!/bin/sh
# This script has 2 lines of fast code to resolve an issue with fortrabbit "universal" apps for PHP sites, but could be used for others.
# For background, see https://help.fortrabbit.com/git-deployment#toc-git-deployment-vs-universal-apps
# On reading that, I expected "overwrite but not delete" strategy meant files outside git would not be deleted.  
# However it literally means a committed delete will not be deleted.
# In other words, if you change a file to be empty, it's nullified on push.  But if you delete, nothing happens on push; could leave insecure code on your server.

# fortrabbit does not place the .gitignore but rsync requires it, so push it up
scp ~/SOURCEDIR/.gitignore FORTRABBITAPP@tunnel.us1.frbit.com:~

# Use rsync only for delete purposes; see rsync man with properly escaped text https://www.samba.org/ftp/rsync/rsync.html
# --existing --ignore-existing to ensure we don't add or modify files
# --delete-after --recursive to have rsync delete files AFTER determining any file/folder exclusions 
# --filter to exclude files according .gitignore (use ensures excluded files like vendor/uploads/etc aren't deleted)
# this filter pattern applies any found .gitignore files (not just the root .gitignore)
# .gitignore patterns may not match .rsync-filter precisely; add --dry-run to test
# --log-file="log.txt" -vv > /dev/null to record all changes to log file and suppress screen output
# thanks to https://stackoverflow.com/a/15373763 for discussion on using .gitignore in place of .rsync-filter
rsync --existing --ignore-existing --delete-after --recursive --filter=":- .gitignore" ~/SOURCEDIR/ FORTRABBITAPP@deploy.us1.frbit.com:~/  --log-file="log.txt" -vv > /dev/null

#optionally, strip out superflous lines so that only the deleted items are logged.
#sed -i '' '/\*deleting /!d' log.txt

For simple cases, can do something like:

rsync --existing --ignore-existing --delete-after --recursive --exclude="/public/app/uploads/" ~/SOURCEDIR/ FORTRABBITAPP@deploy.us1.frbit.com:~/ --log-file="log.txt" -vv > /dev/null