bug#20008: 24.4; Eshell eshell/which uses eshell-path-env but error with (getenv "PATH"), and these 2 sometimes get out of sync (not remote directory)

[Hua Wei]

M-x eshell
switch to other buffer 
use (setenv "PATH"  "some path") to set new PATH env var
enter eshell with C-u 2 eshell   (there is already one eshell buffer running)
  a new eshell buffer opens
type command "which <new cmd under new path>"
output   "not found   in 'path'"  (in this message, the 'path' is from (getenv 
"PATH"))
  this is confusing, because the function uses 'eshell-path-env' for search and 
use (getenv "PATH") for error messaging 
the bug:
eshell-path-env gets out of sync with (getenv "PATH")




In GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.7)
 of 2014-11-29 
Windowing system distributor `The X.Org Foundation', version 11.0.11403000
System Description:     Linux Mint 16 Petra

Important settings:
  value of $LC_MONETARY: ja_JP.UTF-8
  value of $LC_NUMERIC: ja_JP.UTF-8
  value of $LC_TIME: ja_JP.UTF-8
  value of $LANG: zh_CN.utf8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: EShell

Minor modes in effect:
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode 
semantic-show-unmatched-syntax-mode semantic-idle-scheduler-mode)  S)))
  shell-dirtrack-mode: t
  display-time-mode: t
  evil-mode: t
  evil-local-mode: t
  ido-ubiquitous-mode: t
  on-screen-global-mode: t
  electric-pair-mode: t
  global-ede-mode: t
  global-cwarn-mode: t
  global-semantic-idle-breadcrumbs-mode: t
  show-paren-mode: t
  global-highlight-changes-mode: t
  highlight-changes-visible-mode: t
  global-hl-line-mode: t
  icomplete-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  ido-everywhere: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  recentf-mode: t
  override-global-mode: t
  tooltip-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
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  abbrev-mode: t


Recent messages:
Invalid face reference: nil [13 times]

Invalid face reference: nil [13 times]
 [2 times]
Invalid face reference: nil [13 times]
QuitInvalid face reference: nil
Invalid face reference: nil [12 times]
Quit
Invalid face reference: nil [39 times]
 [2 times]

Load-path shadows:
/usr/share/emacs/site-lisp/flim/hex-util hides 
/usr/local/share/emacs/24.4/lisp/hex-util
/usr/share/emacs/site-lisp/flim/md4 hides /usr/local/share/emacs/24.4/lisp/md4
/usr/share/emacs/site-lisp/flim/sasl-ntlm hides 
/usr/local/share/emacs/24.4/lisp/net/sasl-ntlm
/usr/share/emacs/site-lisp/flim/hmac-md5 hides 
/usr/local/share/emacs/24.4/lisp/net/hmac-md5
/usr/share/emacs/site-lisp/flim/sasl hides 
/usr/local/share/emacs/24.4/lisp/net/sasl
/usr/share/emacs/site-lisp/flim/sasl-digest hides 
/usr/local/share/emacs/24.4/lisp/net/sasl-digest
/usr/share/emacs/site-lisp/flim/hmac-def hides 
/usr/local/share/emacs/24.4/lisp/net/hmac-def
/usr/share/emacs/site-lisp/flim/sasl-cram hides 
/usr/local/share/emacs/24.4/lisp/net/sasl-cram
/usr/share/emacs/site-lisp/flim/ntlm hides 
/usr/local/share/emacs/24.4/lisp/net/ntlm
/usr/share/emacs/site-lisp/flim/attic/smtpmail hides 
/usr/local/share/emacs/24.4/lisp/mail/smtpmail
/usr/share/emacs/site-lisp/wl/utils/rfc2368 hides 
/usr/local/share/emacs/24.4/lisp/mail/rfc2368
/usr/share/emacs/site-lisp/wl/elmo/utf7 hides 
/usr/local/share/emacs/24.4/lisp/gnus/utf7

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notify-autoloads powershell-autoloads powershell-mode-autoloads
s-autoloads stem-autoloads telepathy-autoloads theme-changer-autoloads
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dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
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 (vectors 16 53911)
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 (heap 1024 159776 4041))