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bug#33255: 27.0.50; expand-file-name: default directory expanded twice i

From: immerrr again
Subject: bug#33255: 27.0.50; expand-file-name: default directory expanded twice if relative
Date: Sun, 4 Nov 2018 11:54:49 +0100

I have recently tried to play with a clean .emacs.d directory by setting
HOME=clean/home/dir, but faced an error coming from deep inside
package-install. The error boils down to the fact that
`expand-file-name' for some reason doubles the `default-directory'
prefix when it is relative:

$ emacs -Q -batch --eval '(let ((default-directory "DEFAULT-DIR/"))
(print (expand-file-name "EXPANDED-DIR/")))'


Interestingly, if you run `expand-file-name' twice you end up with four

$ emacs -Q -batch --eval '(let ((default-directory "DEFAULT-DIR/"))
(print (expand-file-name (expand-file-name "EXPANDED-DIR/"))))'


I couldn't find any requirement for DEFAULT-DIRECTORY parameter or
`default-directory' variable to be absolute, so I would assume this is a
bug in expand-file-name.

In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2018-07-09 built on mmrcomp
Repository revision: 3307353e13a9226d477c9b1a39baae76584b90b9
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 16.04.5 LTS

Recent messages:
Mark set
Saving file /home/immerrr/.cask/cask-cli.el...
Wrote /home/immerrr/.cask/cask-cli.el
Saving file /home/immerrr/.cask/cask-cli.el...
Wrote /home/immerrr/.cask/cask-cli.el
Saving file /home/immerrr/.cask/cask-cli.el...
Wrote /home/immerrr/.cask/cask-cli.el
Saving file /home/immerrr/.cask/cask-cli.el...
Wrote /home/immerrr/.cask/cask-cli.el
Mark set

Configured using:
 'configure --prefix=/home/immerrr/.local'

Configured features:

Important settings:
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: el

Minor modes in effect:
  magit-auto-revert-mode: t
  auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  diff-auto-refine-mode: t
  nameless-mode: t
  guide-key-mode: t
  whitespace-mode: t
  flycheck-mode: t
  shell-dirtrack-mode: t
  counsel-projectile-mode: t
  projectile-mode: t
  ivy-mode: t
  global-company-mode: t
  company-mode: t
  pyvenv-mode: t
  paredit-mode: t
  auto-compile-on-save-mode: t
  auto-compile-mode: t
  recentf-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  save-place-mode: t
  show-paren-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  override-global-mode: t
  bar-cursor-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
hides /home/immerrr/.emacs.d/elpa/lua-mode-20180104.626/init-tryout

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base64 format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 1357726 145867)
 (symbols 48 50837 2)
 (miscs 40 6306 4056)
 (strings 32 121140 10207)
 (string-bytes 1 4278168)
 (vectors 16 68224)
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 (buffers 992 53)
 (heap 1024 76825 5884))

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