Fix #3727: 'doom: command not found' error on 'doom upgrade'

core/core-cli.el

@@ -177,10 +177,11 @@ COMMAND, and passes ARGS to it."
       (insert "#!/usr/bin/env sh\n"
               (save-match-data
                 (cl-loop for env in process-environment
-                         if (string-match "^\\([^ !@#$%^&*()=]+\\)=\\(.+\\)$" env)
-                         concat (format "%s=%S\n"
+                         if (string-match "^\\([a-zA-Z0-9_]+\\)=\\(.+\\)$" env)
+                         concat (format "export %s=%S\n"
                                         (match-string 1 env)
                                         (match-string 2 env))))
+              (format "\nexport PATH=\"%s:$PATH\"\n" (concat doom-emacs-dir "bin/"))
               "\n[ -x \"$0\" ] && rm -f \"$0\"\n"
               (if (stringp lines)
                   lines