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Avoid bogus abbreviated file names if HOME changes

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* lisp/files.el (abbreviate-file-name):
If HOME changes, ignore `abbreviated-home-dir'.  (Bug#19657#20)
* test/lisp/files-tests.el (files-test-abbreviated-home-dir): New.
This commit is contained in:
Glenn Morris 2017-11-21 12:27:36 -05:00
parent 8d450453fa
commit 92f0c4cd56
2 changed files with 48 additions and 24 deletions
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58
lisp/files.el
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@ -1859,9 +1859,9 @@ home directory is a root directory) and removes automounter prefixes
When this function is first called, it caches the user's home
directory as a regexp in `abbreviated-home-dir', and reuses it
afterwards. Lisp programs that temporarily set the home directory
to a different value should let-bind `abbreviated-home-dir' for
the modified home directory to take effect."
afterwards (so long as the home directory does not change;
if you want to permanently change your home directory after having
started Emacs, set `abbreviated-home-dir' to nil so it will be recalculated)."
;; Get rid of the prefixes added by the automounter.
(save-match-data
(if (and automount-dir-prefix
@ -1883,29 +1883,37 @@ the modified home directory to take effect."
;; give time for directory-abbrev-alist to be set properly.
;; We include a slash at the end, to avoid spurious matches
;; such as `/usr/foobar' when the home dir is `/usr/foo'.
(or abbreviated-home-dir
(setq abbreviated-home-dir
(let ((abbreviated-home-dir "$foo"))
(setq abbreviated-home-dir
(concat "\\`"
(abbreviate-file-name (expand-file-name "~"))
"\\(/\\|\\'\\)"))
;; Depending on whether default-directory does or
;; doesn't include non-ASCII characters, the value
;; of abbreviated-home-dir could be multibyte or
;; unibyte. In the latter case, we need to decode
;; it. Note that this function is called for the
;; first time (from startup.el) when
;; locale-coding-system is already set up.
(if (multibyte-string-p abbreviated-home-dir)
abbreviated-home-dir
(decode-coding-string abbreviated-home-dir
(if (eq system-type 'windows-nt)
'utf-8
locale-coding-system))))))
(unless abbreviated-home-dir
(put 'abbreviated-home-dir 'home (expand-file-name "~"))
(setq abbreviated-home-dir
(let ((abbreviated-home-dir "$foo"))
(setq abbreviated-home-dir
(concat "\\`"
(abbreviate-file-name
(get 'abbreviated-home-dir 'home))
"\\(/\\|\\'\\)"))
;; Depending on whether default-directory does or
;; doesn't include non-ASCII characters, the value
;; of abbreviated-home-dir could be multibyte or
;; unibyte. In the latter case, we need to decode
;; it. Note that this function is called for the
;; first time (from startup.el) when
;; locale-coding-system is already set up.
(if (multibyte-string-p abbreviated-home-dir)
abbreviated-home-dir
(decode-coding-string abbreviated-home-dir
(if (eq system-type 'windows-nt)
'utf-8
locale-coding-system))))))
;; If FILENAME starts with the abbreviated homedir,
;; and ~ hasn't changed since abbreviated-home-dir was set,
;; make it start with `~' instead.
;; If ~ has changed, we ignore abbreviated-home-dir rather than
;; invalidating it, on the assumption that a change in HOME
;; is likely temporary (eg for testing).
;; FIXME Is it even worth caching abbreviated-home-dir?
;; Ref: https://debbugs.gnu.org/19657#20
(if (and (string-match abbreviated-home-dir filename)
;; If the home dir is just /, don't change it.
(not (and (= (match-end 0) 1)
@ -1914,7 +1922,9 @@ the modified home directory to take effect."
;; Novell Netware allows drive letters beyond `Z:'.
(not (and (memq system-type '(ms-dos windows-nt cygwin))
(save-match-data
(string-match "^[a-zA-`]:/$" filename)))))
(string-match "^[a-zA-`]:/$" filename))))
(equal (get 'abbreviated-home-dir 'home)
(expand-file-name "~")))
(setq filename
(concat "~"
(match-string 1 filename)

14
test/lisp/files-tests.el
View File

@ -411,5 +411,19 @@ name (Bug#28412)."
(should (file-directory-p (concat (file-name-as-directory dest2) "a")))
(delete-directory dir 'recursive)))
(ert-deftest files-test-abbreviated-home-dir ()
"Test that changing HOME does not confuse `abbreviate-file-name'.
See <https://debbugs.gnu.org/19657#20>."
(let* ((homedir temporary-file-directory)
(process-environment (cons (format "HOME=%s" homedir)
process-environment))
(abbreviated-home-dir nil)
(testfile (expand-file-name "foo" homedir))
(old (file-truename (abbreviate-file-name testfile)))
(process-environment (cons (format "HOME=%s"
(expand-file-name "bar" homedir))
process-environment)))
(should (equal old (file-truename (abbreviate-file-name testfile))))))
(provide 'files-tests)
;;; files-tests.el ends here