https://bugs.gentoo.org/646588
https://github.com/parona-source/virtualenvwrapper/commit/d7dd99ca8e4ebdf5668708634cf793acee5d35b3

From d7dd99ca8e4ebdf5668708634cf793acee5d35b3 Mon Sep 17 00:00:00 2001
From: Alfred Wingate <parona@protonmail.com>
Date: Wed, 21 Jun 2023 11:35:04 +0300
Subject: [PATCH] Remove use of which, use command -v or built-ins instead

* which isn't a POSIX tool and some distributions have or are still
  considering dropping it in favour of using commands included by
  POSIX or shell built-ins.
* Used command built-in where applicable, but type and whence for bash
  and zsh respectively in virtualenvwrapper_verify_resource to preserve
  previous behaviour with which when programs also have built-ins
  with the same name. command -v outputs just the name and not the path
  in those cases.

https://lwn.net/Articles/874049/
https://bugs.gentoo.org/646588

Signed-off-by: Alfred Wingate <parona@protonmail.com>
---
 tests/run_tests            |  2 +-
 tests/test_cp.sh           |  2 +-
 tests/test_mkvirtualenv.sh |  4 +---
 virtualenvwrapper.sh       | 10 ++++++++--
 virtualenvwrapper_lazy.sh  |  2 +-
 5 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/tests/run_tests b/tests/run_tests
index 68cb362..c9a81d6 100755
--- a/tests/run_tests
+++ b/tests/run_tests
@@ -62,7 +62,7 @@ do
     echo "  BASH_VERSION=$BASH_VERSION"
     echo "  ZSH_VERSION=$ZSH_VERSION"
     echo "  KSH_VERSION=$KSH_VERSION"
-    echo "  virtualenv=$(which virtualenv)"
+    echo "  virtualenv=$(command -v virtualenv)"
     echo "  test_shell_opts=$test_shell_opts"
     echo "  ZSH=$ZSH_NAME $ZSH_EVAL_CONTEXT"
     echo "  TMPDIR=$TMPDIR"
diff --git a/tests/test_cp.sh b/tests/test_cp.sh
index 3bd9196..3227c7a 100755
--- a/tests/test_cp.sh
+++ b/tests/test_cp.sh
@@ -26,7 +26,7 @@ test_new_env_activated () {
     (cd tests/testpackage && python setup.py install) >/dev/null 2>&1
     cpvirtualenv "source" "destination" >/dev/null 2>&1
     rmvirtualenv "source" >/dev/null 2>&1
-    testscript="$(which testscript.py)"
+    testscript="$(command -v testscript.py)"
     assertTrue "Environment test script not found in path" "[ $WORKON_HOME/destination/bin/testscript.py -ef $testscript ]"
     testscriptcontent="$(cat $testscript)"
     assertTrue "No cpvirtualenvtest in $testscriptcontent" "echo $testscriptcontent | grep cpvirtualenvtest"
diff --git a/tests/test_mkvirtualenv.sh b/tests/test_mkvirtualenv.sh
index 3c37dfe..47b603a 100755
--- a/tests/test_mkvirtualenv.sh
+++ b/tests/test_mkvirtualenv.sh
@@ -68,11 +68,9 @@ GLOBAL postmkvirtualenv"
 }
 
 test_no_virtualenv () {
-	# Find "which" before we change the path
-	which=$(which which)
     old_path="$PATH"
     PATH="/bin:/usr/sbin:/sbin"
-    venv=$($which virtualenv 2>/dev/null)
+    venv=$(command -v virtualenv)
 	if [ ! -z "$venv" ]
 	then
         echo "FOUND \"$venv\" in PATH so skipping this test"
diff --git a/virtualenvwrapper.sh b/virtualenvwrapper.sh
index b8e4a42..469fa35 100644
--- a/virtualenvwrapper.sh
+++ b/virtualenvwrapper.sh
@@ -47,7 +47,7 @@
 # Locate the global Python where virtualenvwrapper is installed.
 if [ "${VIRTUALENVWRAPPER_PYTHON:-}" = "" ]
 then
-    _virtualenvwrapper_python_executable="$(which python3 2>/dev/null)"
+    _virtualenvwrapper_python_executable="$(command -v python3)"
     if [ -n "$_virtualenvwrapper_python_executable" ] && $_virtualenvwrapper_python_executable -m 'virtualenvwrapper.hook_loader' --help >/dev/null 2>&1
     then
         VIRTUALENVWRAPPER_PYTHON=$_virtualenvwrapper_python_executable
@@ -330,7 +330,13 @@ function virtualenvwrapper_initialize {
 
 # Verify that the passed resource is in path and exists
 function virtualenvwrapper_verify_resource {
-    typeset exe_path="$(command \which "$1" | (unset GREP_OPTIONS; command \grep -v "not found"))"
+    if [ -n "${ZSH_VERSION}" ]
+    then
+        typeset exe_path="$(whence -p "${1}")"
+    else
+        typeset exe_path="$(type -P "${1}")"
+    fi
+
     if [ "$exe_path" = "" ]
     then
         echo "ERROR: virtualenvwrapper could not find $1 in your path" >&2
diff --git a/virtualenvwrapper_lazy.sh b/virtualenvwrapper_lazy.sh
index 3902d08..9016b6c 100644
--- a/virtualenvwrapper_lazy.sh
+++ b/virtualenvwrapper_lazy.sh
@@ -5,7 +5,7 @@ export _VIRTUALENVWRAPPER_API="$_VIRTUALENVWRAPPER_API mkvirtualenv rmvirtualenv
 
 if [ -z "$VIRTUALENVWRAPPER_SCRIPT" ]
 then
-    export VIRTUALENVWRAPPER_SCRIPT="$(command \which virtualenvwrapper.sh)"
+    export VIRTUALENVWRAPPER_SCRIPT="$(command -v virtualenvwrapper.sh)"
 fi
 if [ -z "$VIRTUALENVWRAPPER_SCRIPT" ]
 then
-- 
2.41.0