fix.sh in checkoff-0.19.2 vs fix.sh in checkoff-0.20.0

@@ -67,11 +67,22 @@
   ensure_ruby_build
 }
 
 latest_ruby_version() {
   major_minor=${1}
-  rbenv install --list 2>/dev/null | grep "^${major_minor}."
+
+  # Double check that this command doesn't error out under -e
+  rbenv install --list >/dev/null 2>&1
+
+  # not sure why, but 'rbenv install --list' below exits with error code
+  # 1...after providing the same output the previous line gave when it
+  # exited with error code 0.
+  #
+  # https://github.com/rbenv/rbenv/issues/1441
+  set +e
+  rbenv install --list 2>/dev/null | cat | grep "^${major_minor}."
+  set -e
 }
 
 ensure_dev_library() {
   header_file_name=${1:?header file name}
   homebrew_package=${2:?homebrew package}
@@ -89,15 +100,23 @@
   ensure_dev_library readline/readline.h readline libreadline-dev
   ensure_dev_library zlib.h zlib zlib1g-dev
   ensure_dev_library openssl/ssl.h openssl libssl-dev
 }
 
+ensure_latest_ruby_build_definitions() {
+  ensure_rbenv
+
+  git -C "$(rbenv root)"/plugins/ruby-build pull
+}
+
 # You can find out which feature versions are still supported / have
 # been release here: https://www.ruby-lang.org/en/downloads/
 ensure_ruby_versions() {
+  ensure_latest_ruby_build_definitions
+
   # You can find out which feature versions are still supported / have
   # been release here: https://www.ruby-lang.org/en/downloads/
-  ruby_versions="$(latest_ruby_version 2.6)"
+  ruby_versions="$(latest_ruby_version 2.7)"
 
   echo "Latest Ruby versions: ${ruby_versions}"
 
   ensure_ruby_build_requirements