From 56c232610ab44feffef40513c33fbbed22f07034 Mon Sep 17 00:00:00 2001
From: Yamashita Yuu <yamashita@geishatokyo.com>
Date: Tue, 29 Apr 2014 00:51:57 +0900
Subject: [PATCH] Check the usage of virtualenv(s) before the uninstallation of
 versions

---
 etc/pyenv.d/uninstall/virtualenv.bash | 25 +++++++++++++++++++++++++
 install.sh                            |  3 +++
 2 files changed, 28 insertions(+)
 create mode 100644 etc/pyenv.d/uninstall/virtualenv.bash

diff --git a/etc/pyenv.d/uninstall/virtualenv.bash b/etc/pyenv.d/uninstall/virtualenv.bash
new file mode 100644
index 0000000..0146001
--- /dev/null
+++ b/etc/pyenv.d/uninstall/virtualenv.bash
@@ -0,0 +1,25 @@
+VERSION_NAME="${DEFINITION##*/}"
+PREFIX="${PYENV_ROOT}/versions/${VERSION_NAME}"
+
+if ! pyenv-virtualenv-prefix "${VERSION_NAME}" 1>/dev/null 2>&1; then
+  OLDIFS="$IFS"
+  IFS=$'\n' virtualenvs=($(pyenv-virtualenvs --bare))
+  IFS="$OLDIFS"
+
+  declare -a dependencies
+  for venv in "${virtualenvs[@]}"; do
+    venv_prefix="$(pyenv-virtualenv-prefix "${venv}" 2>/dev/null || true)"
+    if [ -d "${venv_prefix}" ] && [ "${PREFIX}" = "${venv_prefix}" ]; then
+      dependencies[${#dependencies[*]}]="${venv}"
+    fi
+  done
+
+  if [ -z "$FORCE" ] && [ -n "$dependencies" ]; then
+    echo "pyenv: ${#dependencies[@]} virtualenv(s) is depending on $PREFIX." >&2
+    read -p "continue with uninstallation? (y/N) "
+    case "$REPLY" in
+    y* | Y* ) ;;
+    * ) exit 1 ;;
+    esac
+  fi
+fi
diff --git a/install.sh b/install.sh
index 1608daf..d3a19fc 100755
--- a/install.sh
+++ b/install.sh
@@ -12,7 +12,10 @@ if [ -z "${PREFIX}" ]; then
 fi
 
 BIN_PATH="${PREFIX}/bin"
+ETC_PATH="${PREFIX}/etc/pyenv.d"
 
 mkdir -p "$BIN_PATH"
+mkdir -p "$ETC_PATH"
 
 install -p bin/* "$BIN_PATH"
+cp -RPp etc/pyenv.d/* "$ETC_PATH"