From c4de2555b7343c95a3380dece3098eaf3baa4e73 Mon Sep 17 00:00:00 2001
From: Andrew Christianson <andrew-christianson@users.noreply.github.com>
Date: Thu, 13 Oct 2022 18:37:08 -0700
Subject: [PATCH] Use realpath of scripts to determine relative locations
 (#308)

Just using paths relative to ${BASH_SOURCE} to access `libexec`
fails if the scripts are symlinked to a location,
such as when installed with Homebrew,
since the `libexec` directory is not linked into `brew --prefix`.

Implement a simple version of `realpath`
and run `${BASH_SOURCE}` through it.
This gets the actual installation directory
relative to which `libexec` is located.

Co-authored-by: Andrew Christianson <achristianson@edmunds.com>
---
 bin/pyenv-virtualenv-prefix | 16 +++++++++++++++-
 bin/pyenv-virtualenvs       | 16 +++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/bin/pyenv-virtualenv-prefix b/bin/pyenv-virtualenv-prefix
index aa71777d..bbe58719 100755
--- a/bin/pyenv-virtualenv-prefix
+++ b/bin/pyenv-virtualenv-prefix
@@ -6,7 +6,21 @@
 
 set -e
 [ -n "$PYENV_DEBUG" ] && set -x
-. "${BASH_SOURCE%/*}"/../libexec/pyenv-virtualenv-realpath
+if [ -L "${BASH_SOURCE}" ]; then
+    READLINK=$(type -p greadlink readlink | head -1)
+    if [ -z "$READLINK" ]; then
+        echo "pyenv: cannot find readlink - are you missing GNU coreutils?" >&2
+        exit 1
+    fi
+    resolve_link() {
+        $READLINK -f "$1"
+    }
+    script_path=$(resolve_link ${BASH_SOURCE})
+else
+    script_path=${BASH_SOURCE}
+fi
+
+. ${script_path%/*}/../libexec/pyenv-virtualenv-realpath
 
 if [ -z "$PYENV_ROOT" ]; then
   PYENV_ROOT="${HOME}/.pyenv"
diff --git a/bin/pyenv-virtualenvs b/bin/pyenv-virtualenvs
index f9426bb5..fec12868 100755
--- a/bin/pyenv-virtualenvs
+++ b/bin/pyenv-virtualenvs
@@ -7,7 +7,21 @@
 
 set -e
 [ -n "$PYENV_DEBUG" ] && set -x
-. "${BASH_SOURCE%/*}"/../libexec/pyenv-virtualenv-realpath
+if [ -L "${BASH_SOURCE}" ]; then
+    READLINK=$(type -p greadlink readlink | head -1)
+    if [ -z "$READLINK" ]; then
+        echo "pyenv: cannot find readlink - are you missing GNU coreutils?" >&2
+        exit 1
+    fi
+    resolve_link() {
+        $READLINK -f "$1"
+    }
+    script_path=$(resolve_link ${BASH_SOURCE})
+else
+    script_path=${BASH_SOURCE}
+fi
+
+. ${script_path%/*}/../libexec/pyenv-virtualenv-realpath
 
 if [ -z "$PYENV_ROOT" ]; then
   PYENV_ROOT="${HOME}/.pyenv"