From 49fba599e872bc761858ea6f700271fb6dcb5a97 Mon Sep 17 00:00:00 2001
From: Conner Crosby <conner@cavcrosby.tech>
Date: Sat, 30 Apr 2022 22:04:07 -0400
Subject: [PATCH] Add an ability to install a specific version of pyenv (#126)

---
 README.rst          |  2 ++
 bin/pyenv-installer | 14 +++++++-------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/README.rst b/README.rst
index 65f8bc5..101edce 100644
--- a/README.rst
+++ b/README.rst
@@ -19,6 +19,8 @@ Once prerequisites have been installed correctly:
 
 Install:
 ~~~~
+If you wish to install a specific release of Pyenv rather than the latest head, set the ``PYENV_GIT_TAG`` environment variable (e.g. ``export PYENV_GIT_TAG=v2.2.5``).
+
 .. code:: bash
 
     curl https://pyenv.run | bash
diff --git a/bin/pyenv-installer b/bin/pyenv-installer
index f8916b6..80386fa 100755
--- a/bin/pyenv-installer
+++ b/bin/pyenv-installer
@@ -29,7 +29,7 @@ failed_checkout() {
 }
 
 checkout() {
-  [ -d "$2" ] || git clone --depth 1 "$1" "$2" || failed_checkout "$1"
+  [ -d "$2" ] || git -c advice.detachedHead=0 clone --branch "$3" --depth 1 "$1" "$2" || failed_checkout "$1"
 }
 
 if ! command -v git 1>/dev/null 2>&1; then
@@ -43,12 +43,12 @@ else
   GITHUB="https://github.com"
 fi
 
-checkout "${GITHUB}/pyenv/pyenv.git"            "${PYENV_ROOT}"
-checkout "${GITHUB}/pyenv/pyenv-doctor.git"     "${PYENV_ROOT}/plugins/pyenv-doctor"
-checkout "${GITHUB}/pyenv/pyenv-installer.git"  "${PYENV_ROOT}/plugins/pyenv-installer"
-checkout "${GITHUB}/pyenv/pyenv-update.git"     "${PYENV_ROOT}/plugins/pyenv-update"
-checkout "${GITHUB}/pyenv/pyenv-virtualenv.git" "${PYENV_ROOT}/plugins/pyenv-virtualenv"
-checkout "${GITHUB}/pyenv/pyenv-which-ext.git"  "${PYENV_ROOT}/plugins/pyenv-which-ext"
+checkout "${GITHUB}/pyenv/pyenv.git"            "${PYENV_ROOT}"                           "${PYENV_GIT_TAG:-master}"
+checkout "${GITHUB}/pyenv/pyenv-doctor.git"     "${PYENV_ROOT}/plugins/pyenv-doctor"      "master"
+checkout "${GITHUB}/pyenv/pyenv-installer.git"  "${PYENV_ROOT}/plugins/pyenv-installer"   "master"
+checkout "${GITHUB}/pyenv/pyenv-update.git"     "${PYENV_ROOT}/plugins/pyenv-update"      "master"
+checkout "${GITHUB}/pyenv/pyenv-virtualenv.git" "${PYENV_ROOT}/plugins/pyenv-virtualenv"  "master"
+checkout "${GITHUB}/pyenv/pyenv-which-ext.git"  "${PYENV_ROOT}/plugins/pyenv-which-ext"   "master"
 
 if ! command -v pyenv 1>/dev/null; then
   { echo