bug#21435: 25.0.50; file-notify has problems after renames

[Tassilo Horn]

file-notify using the inotify backend reports wrong events after
directory renames.  For example, with

(let* ((flags '(change attribute-change))
       (handler (lambda (event)
                  (message "WATCH: %S" event)))
       (x "/tmp/x")
       (y "/tmp/x/y"))
  (make-directory x)
  (make-directory y)
  (file-notify-add-watch x flags handler)
  (file-notify-add-watch y flags handler))

the following events are reported after these shell operations:

  1. $ touch /tmp/x/y/test1
     WATCH: ((12) created "/tmp/x/y/test1")
     WATCH: ((12) attribute-changed "/tmp/x/y/test1")
  2. $ mv /tmp/x/y /tmp/x/z
     WATCH: ((11) renamed "/tmp/x/y" "/tmp/x/z") [2 times]
  3. $ touch /tmp/x/z/test2
     WATCH: ((12) created "/tmp/x/y/test2")
     WATCH: ((12) attribute-changed "/tmp/x/y/test2")

In 3, the file created is actually /tmp/x/z/test2, not /tmp/x/y/test2.

There is also a problem with single-file watches:

(let* ((flags '(change attribute-change))
       (handler (lambda (event)
                  (message "WATCH: %S" event)))
       (x "/tmp/x"))
  (with-temp-buffer
    (insert "TEST\n")
    (write-file x))
  (file-notify-add-watch x flags handler))

  1. $ mv /tmp/x /tmp/y
     WATCH: ((1 . "x") renamed "/tmp/x" "/tmp/y") [2 times]
  2. $ echo "more" >> /tmp/y
     ;; no notification
  3. $ touch /tmp/x
     WATCH: ((1 . "x") created "/tmp/x")
     WATCH: ((1 . "x") changed "/tmp/x")

So in the case of single-file watches, the watch seems to stick to a
filename rather than a file.  Well, I think that's ok but then I would
expect it to be similar with directories, e.g., in the first example
step 3 should not report a notification because I intended to watch
/tmp/x/y and not /tmp/x/z.

Another thing is that renames always seem to be reported twice (although
the example in the manual lists only one event but that example has
probably gathered with the gfilenotify backend).



In GNU Emacs 25.0.50.10 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-09-08
Repository revision: 6cd64aaf1317bdd96f29fa2a7c3d49172e79bc37
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:     Arch Linux

Configured using:
 'configure 'CFLAGS=-g -ggdb3 -O1''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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Recent messages:
WATCH: (((10) attribute-changed "/home/horn/x/y/bar"))
Auto-saving...
WATCH: (((10) created "/home/horn/x/y/foo"))
WATCH: (((10) attribute-changed "/home/horn/x/y/foo"))
Mark set [2 times]
Undo! [10 times]
Indenting region...done
WATCH: (((10) deleted "/home/horn/x/y/bar"))
WATCH: (((10) deleted "/home/horn/x/y/foo"))
WATCH: (((9) deleted "/home/horn/x/z"))

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Features:
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url-auth url-gw warnings hl-line nndraft nnmh rot13 utf-7 gnutls
network-stream nsm starttls nnml nnnil gnus-agent gnus-srvr gnus-score
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gnus-registry registry eieio-compat eieio-base th-private smex ido seq
filenotify debug eieio-opt speedbar sb-image ezimage dframe colir color
company-files company-oddmuse company-keywords company-etags
company-gtags company-dabbrev-code company-dabbrev company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb company
stratego-mode greql-mode tg-mode generic preview-latex tex-site
auto-loads cider tramp-sh cider-debug cider-browse-ns cider-inspector
cider-mode cider-repl cider-eldoc cider-interaction spinner arc-mode
archive-mode cider-overlays cider-doc 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
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google-contacts xml url-cache google-oauth google-contacts-gnus gnus-art
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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
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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 966399 50632)
 (symbols 48 59145 97)
 (miscs 40 580 1231)
 (strings 32 188617 43232)
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 (vectors 16 62335)
 (vector-slots 8 1828918 146254)
 (floats 8 1054 1533)
 (intervals 56 7960 3005)
 (buffers 976 66)
 (heap 1024 100878 51951))