bug#44310: 27.1; eshell over tramp-mode cannot locate /bin/ executables on the remote machine

[Novak Boškov]

Steps to reproduce:
1. Use regular C-x C-f /ssh:remote:/path/on/remote. The remote machine is a
GNU Linux machine too.

2. Then open eshell using M-x eshell on the remote machine.

3. Type `top` in the eshell prompt. You see the following error in a *top*
buffer:

..: 1: exec: /ssh:remote:/bin/top: not found

Process /ssh:remote:/bin/top exited abnormally with code 127

Expected behavior:
Since /bin/top is present on the remote (which can be verified if you do
the same in M-x shell), I'd expect top to work there via eshell.

I've verified that top in eshell does work if the eshell is run on the
local machine (no ssh and tramp-mode).


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30,
cairo version 1.15.10)
 of 2020-08-26 built on lgw01-amd64-030
Repository revision: a2fc5f02361a34ff7322032ce027c8bc4cc3b25a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.5 LTS

Recent messages:
(no useful messages)

Configured using:
 'configure --prefix= --prefix=/snap/emacs/current/usr --with-xwidgets
 --with-x-toolkit=gtk3 --without-xaw3d --with-modules --with-cairo
 'CFLAGS= -isystem/build/emacs/parts/emacs/install/usr/include -O2'
 'CPPFLAGS= -isystem/build/emacs/parts/emacs/install/usr/include'
 'LDFLAGS= -L/build/emacs/parts/emacs/install/lib
 -L/build/emacs/parts/emacs/install/usr/lib
 -L/build/emacs/parts/emacs/install/lib/x86_64-linux-gnu
 -L/build/emacs/parts/emacs/install/usr/lib/x86_64-linux-gnu''

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Go

Minor modes in effect:
  subword-mode: t
  global-magit-file-mode: t
  magit-file-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  lsp-diagnostics-mode: t
  lsp-modeline-workspace-status-mode: t
  lsp-modeline-diagnostics-mode: t
  lsp-modeline-code-actions-mode: t
  dap-tooltip-mode: t
  dap-ui-many-windows-mode: t
  dap-ui-controls-mode: t
  dap-ui-mode: t
  treemacs-filewatch-mode: t
  treemacs-follow-mode: t
  treemacs-git-mode: deferred
  treemacs-fringe-indicator-mode: t
  dap-auto-configure-mode: t
  dap-mode: t
  lsp-completion-mode: t
  guru-mode: t
  pdf-occur-global-minor-mode: t
  lsp-ui-mode: t
  lsp-ui-doc-mode: t
  lsp-ui-sideline-mode: t
  lsp-managed-mode: t
  lsp-mode: t
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  which-function-mode: t
  global-company-mode: t
  company-mode: t
  helm-mode: t
  helm-descbinds-mode: t
  helm-ff-cache-mode: t
  helm--remap-mouse-mode: t
  async-bytecomp-package-mode: t
  ivy-mode: t
  erc-truncate-mode: t
  erc-track-mode: t
  erc-spelling-mode: t
  pixel-scroll-mode: t
  editorconfig-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  whitespace-mode: t
  global-anzu-mode: t
  anzu-mode: t
  projectile-mode: t
  flyspell-mode: t
  volatile-highlights-mode: t
  global-hl-line-mode: t
  super-save-mode: t
  recentf-mode: t
  savehist-mode: t
  save-place-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  prelude-mode: t
  shell-dirtrack-mode: t
  which-key-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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:
None found.

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