chruby-copy-gems.sh

#!/bin/sh

old_version=$1
new_version=$2

inventory=$(chruby-exec $old_version -- gem list -q | sed -e 's/^\([^ ]*\) (\(.*\))/\1:\2/' -e 's/[:,] */:/g')
for item in $inventory; do
	gem=${item%%:*}
	versions=${item#*:}
	versions=$(echo $versions | sed -e 's/:/ /g')
	for version in $versions; do
		[ "$version" = "default" ] && continue
		if ! chruby-exec $new_version -- gem list -i -v $version $gem >/dev/null; then
			chruby-exec $new_version -- gem install --no-document --ignore-dependencies -v $version $gem \
				|| echo "Skipped $gem-$version, install failed." 1>&2
		else
			echo "Skipped $gem-$version, already installed."
		fi
	done
done