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bug#27315: Regression: `abbreviate-file-name' and `tramp-file-name-handl


From: Alexander Shukaev
Subject: bug#27315: Regression: `abbreviate-file-name' and `tramp-file-name-handler'
Date: Sat, 10 Jun 2017 21:00:22 +0200

Hello,

In Emacs 26 series, I notice regression that has to do with `abbreviate-file-name' and `tramp-file-name-handler'. Here is how to reproduce it:

$ emacs -Q

Paste the following to the "*scratch*" buffer:

(setq-default
  frame-title-format
  '((:eval (list (user-login-name)
                 "@"
                 (system-name)
                 ":"
                 (abbreviate-file-name (or (buffer-file-name)
                                           (file-name-as-directory
                                            default-directory)))))))

M-x eval-buffer
M-x find-file /sudo:address@hidden:~/hang

will result in hanging with the "Sending password" message in minibuffer. I did not debug this, but I know for sure how to workaround this and, therefore, can provide a clue how to fix it. That is

$ emacs -Q

Paste the following to the "*scratch*" buffer:

(setq-default
  frame-title-format
  '((:eval (list (user-login-name)
                 "@"
                 (system-name)
                 ":"
                 (let (file-name-handler-alist)
                   (abbreviate-file-name (or (buffer-file-name)
                                             (file-name-as-directory
                                              default-directory))))))))

M-x eval-buffer
M-x find-file /sudo:address@hidden:~/yuppie

opens the file just fine. It means that somehow since Emacs 26 `abbreviate-file-name' either triggers `tramp-file-name-handler' or it did so before but this time (I heard that the TRAMP syntax has changed) it might be bugged.

Michael, could you have a look at this?  Thanks!

Kind regards,
Alexander





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