Add logic to update pyenv every hour

.gitignore

@@ -1 +1,2 @@
 /pyenv
+/pyenv_last_update

bin/install

@@ -2,7 +2,7 @@
 
 set -e
 
-source "$(dirname "$0")"/utils.sh
+source "$(dirname "$0")/utils.sh"
 
 install_python() {
   local install_type=$1
@@ -14,6 +14,7 @@ install_python() {
     echoerr "For a list of available versions, see \`asdf list-all python\`."
     exit 1
   fi
+  install_or_update_python_build
 
   echo "python-build $version $install_path"
   $(python_build_path) "$version" "$install_path"

bin/list-all

@@ -3,8 +3,7 @@
 source "$(dirname "$0")/utils.sh"
 
 list_all() {
-  ensure_python_build_installed
-
+  install_or_update_python_build
   $(python_build_path) --definitions | tr '\n' ' '
 }
 

bin/utils.sh

@@ -18,6 +18,38 @@ python_build_path() {
   echo "$(pyenv_path)/plugins/python-build/bin/python-build"
 }
 
+update_python_build() {
+  cd "$(pyenv_path)" && git fetch && git reset --hard origin/master > /dev/null 2>&1
+}
+
 pyenv_path() {
   echo "$(dirname $(dirname $0))/pyenv"
 }
+
+pyenv_update_timestamp_path() {
+  echo "$(dirname $(dirname "$0"))/pyenv_last_update"
+}
+
+pyenv_should_update() {
+  update_timeout=3600
+  update_timestamp_path=$(pyenv_update_timestamp_path)
+
+  if [ ! -f "$update_timestamp_path" ]; then
+    return 0
+  fi
+
+  last_update=$(cat "$update_timestamp_path")
+  current_timestamp=$(date +%s)
+  invalidated_at=$(($last_update + $update_timeout))
+
+  [ $invalidated_at -lt $current_timestamp ]
+}
+
+install_or_update_python_build() {
+  if [ ! -f "$(python_build_path)" ]; then
+    download_python_build
+  elif pyenv_should_update; then
+    update_python_build
+    date +%s > "$(pyenv_update_timestamp_path)"
+  fi
+}