Make deploying from Git repositories to SVN a bit easier.

deploy-to-svn.sh

#!/bin/bash

if [ $# -eq 0 ]; then
  echo "Run this script from within the root of the git repository that you'd like to deploy."
  echo "You can only deploy something that's already been tagged in git."
	echo 'Usage: `deploy-to-svn.sh <tag | HEAD>`'
	exit 1
fi

GIT_DIR=$( pwd )
PLUGIN=$( basename $GIT_DIR )
SVN_DIR="/tmp/wp-plugins/$PLUGIN"
TARGET=$1

cd $GIT_DIR

# Make sure we don't have uncommitted changes.
if [[ -n $( git status -s --porcelain ) ]]; then
	echo "Uncommitted changes found."
	echo "Please deal with them and try again clean."
	exit 1
fi

if [ "$TARGET" != "HEAD" ]; then

	# Make sure we're trying to deploy something that's been tagged. Don't deploy non-tagged.
	if [ -z $( git tag | grep "^$TARGET$" ) ]; then
		echo "Tag $TARGET not found in git repository."
		echo "Please try again with a valid tag."
		exit 1
	fi
else
	read -p "You are about to deploy a change from an unstable state 'HEAD'. This should only be done to update string typos for translators. Are you sure? [y/N]" -n 1 -r
	if [[ $REPLY != "y" && $REPLY != "Y" ]]
	then
		exit 1
	fi
fi

git checkout $TARGET

# Prep a home to drop our new files in. Just make it in /tmp so we can start fresh each time.
rm -rf $SVN_DIR

echo "Checking out SVN shallowly to $SVN_DIR"
svn -q checkout "https://plugins.svn.wordpress.org/$PLUGIN/" --depth=empty $SVN_DIR
echo "Done!"

cd $SVN_DIR

echo "Checking out SVN trunk to $SVN_DIR/trunk"
svn -q up trunk
echo "Done!"

echo "Checking out SVN tags shallowly to $SVN_DIR/tags"
svn -q up tags --depth=empty
echo "Done!"

echo "Deleting everything in trunk except for .svn directories"
for file in $(find $SVN_DIR/trunk/* -not -path "*.svn*"); do
	rm $file 2>/dev/null
done
echo "Done!"

echo "Rsync'ing everything over from Git except for .git stuffs and stuff in .svnignore"
rsync -r --exclude-from "$GIT_DIR/.svnignore" $GIT_DIR/* $SVN_DIR/trunk
echo "Done!"

echo "Updating stable tag in readme.txt"
perl -pi -e "s/Stable tag: .*/Stable tag: $TARGET/" trunk/readme.txt

echo "Now, your turn.  Go to $SVN_DIR and add handle adding or removing any files, then tag and commit."

Keep a .svnignore file in your git directory with files and paths that shouldn't get shoved across to svn. It'll probably look something like this:

.cache
.git
.gitignore
node_modules
package.json
package-lock.json
README.md