bug#21432: 25.0.50; file-notify-rm-watch (inotify) errors if watched dir is deleted

[Tassilo Horn]

Right now, (at least) the inotify version of `file-notify-rm-watch'
signals an error in case the given descriptor denotes a directory which
has been deleted in the meantime.  If it denotes a file which has been
deleted, no error is signaled.

Here's a receipe:

(require 'filenotify)
(let* ((flags '(change))
       (handler (lambda () nil))
       (file (make-temp-file "foo"))
       (file-watch (file-notify-add-watch file flags handler))
       (dir (make-temp-file "bar" t))
       (dir-watch (file-notify-add-watch dir flags handler)))
  (delete-file file)
  (delete-directory dir)
  (file-notify-rm-watch file-watch)    ;; works
  (message "Removed file watch")
  (file-notify-rm-watch dir-watch)     ;; signals an error
  (message "Removed directory watch"))

The documentation does not define any specific behavior for these
situation, so this is currently a gray area which makes it hard for
package developers to develop something which will work right accross
the different notification backends.

I don't have a strong opinion about what the right behavior would be but
at least it seems inconsistent that you get the error only with deleted
directories.  I guess the best solution was if `file-notify-rm-watch'
never signaled an error (then the docs can stay as they are), and there
would be some `file-notify-valid-p' predicate which would test if a
given descriptor still denotes a valid file or directory.  I guess the
latter has probably some function equivalent in the respective backend
APIs, and even if not, it can be implemented by inspecting
`file-notify-descriptors'.



In GNU Emacs 25.0.50.10 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
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org-table org org-macro org-footnote org-pcomplete org-list org-faces
org-entities org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-src ob-keys ob-comint ob-core ob-eval org-compat
org-macs org-loaddefs cal-menu calendar cal-loaddefs cider-test
cider-stacktrace cider-client cider-util nrepl-client tramp tramp-compat
tramp-loaddefs trampver shell pcomplete queue ewoc etags xref project
dash clojure-mode paredit aggressive-indent epa-file epa epg rdictcc
google-contacts-message google-contacts xml url-cache google-oauth
google-contacts-gnus gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source tls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range
gnus-win gnus gnus-ems gnus-compat url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util url-parse
auth-source password-cache url-vars mailcap nnheader gnus-util dired-x
em-term term ehelp esh-opt esh-ext esh-util highlight-symbol thingatpt
boxquote rect ecomplete message rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mm-util help-fns
mail-prsvr mailabbrev mail-utils gmm-utils mailheader server yasnippet
disp-table noutline outline pdf-occur ibuf-ext ibuffer tablist
tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw eieio byte-opt bytecomp
byte-compile cconv eieio-core mode-local find-func cedet dired
pdf-isearch let-alist pdf-misc imenu pdf-tools compile comint ansi-color
cus-edit cus-start cus-load pdf-view bookmark pp jka-compr pdf-cache
pdf-info tq pdf-util format-spec image-mode browse-kill-ring derived
recentf tree-widget wid-edit highlight-parentheses cl iedit iedit-lib
cl-extra help-mode hydra lv counsel swiper cap-words superword subword
saveplace savehist paren ivy delsel icomplete mb-depth ace-window
easy-mmode cl-macs gv avy ring smart-mode-line-respectful-theme
smart-mode-line-light-theme cl-seq smart-mode-line rich-minority rx bs
elec-pair edmacro kmacro cl-loaddefs cl-lib gnus-load subr-x pcase
tsdh-light-theme finder-inf memory-usage-autoloads advice info package
easymenu epg-config time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 639836 122215)
 (symbols 48 53035 0)
 (miscs 40 301 344)
 (strings 32 164700 67149)
 (string-bytes 1 5718922)
 (vectors 16 50490)
 (vector-slots 8 1133948 17525)
 (floats 8 961 537)
 (intervals 56 5318 0)
 (buffers 976 29)
 (heap 1024 83217 3736))