bug#53223: closed (27.2; multi-hop TRAMP with find-file-visit-truename t)

[GNU bug Tracking System]

Your message dated Wed, 23 Feb 2022 09:40:43 +0100
with message-id <87ee3u7z78.fsf@gmx.de>
and subject line Re: bug#53223: 27.2; multi-hop TRAMP with 
find-file-visit-truename t
has caused the debbugs.gnu.org bug report #53223,
regarding 27.2; multi-hop TRAMP with find-file-visit-truename t
to be marked as done.

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53223: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=53223
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> --- Begin Message ---
>
>
>
> Subject: 
>
> 27.2; multi-hop TRAMP with find-file-visit-truename t
>
>
>
>
> Date: 
>
> Wed, 12 Jan 2022 22:23:41 +0100
>
>
>
>
> Hi,
>
> I've spotted a problem with TRAMP when using multi-hop ssh with
> find-file-visit-truename set to t.
>
> Assuming that there is a remote machine XXX.YYY.com with SSH server. On local
> machine I run emacs like that:
>
> > emacs -Q --eval '(progn \
> >       (require (quote tramp)) \
> >       (setq find-file-visit-truename t) \
> >       (with-current-buffer (find-file 
> > "/ssh:root@XXX.YYYY.com|ssh:localhost:") \
> >       (tramp-cleanup-all-connections) \
> >       (revert-buffer)))'
>
> It successfully connects to the remote machine and opens dired buffer with the
> correct content, but the filename name in the dired header is not
> '/ssh:XXX.YYYY.com|ssh:localhost:' as I might expect, but
> '/ssh:localhost:/root:'. After (revert-buffer) I get an error in *Messages*:
>
> > tramp-handle-access-file: Reading directory: No such file or directory 
> > /ssh:localhost:/root/
>
> The issue does not reproduce if find-file-visit-truename set to nil. It looks 
> like 'file-truename' doesn't work correctly with multi-hop tramp file names.
>
>
> In GNU Emacs 27.2 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.30, 
> cairo version 1.17.4)
>  of 2021-08-07 built on buildvm-x86-31.iad2.fedoraproject.org
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
> System Description: Fedora Linux 35 (Workstation Edition)
>
> Recent messages:
> Tramp: Found remote shell prompt on ‘XXX.YYY.com’
> Tramp: Sending command ‘exec ssh    -e none localhost’
> Tramp: Waiting for prompts from remote shell...done
> Tramp: Found remote shell prompt on ‘localhost’
> Tramp: Opening connection for localhost using ssh...done
> Tramp: Opening connection for localhost using ssh...
> Tramp: Sending command ‘exec ssh    -e none localhost’
> Tramp: Waiting for prompts from remote shell...done
> Tramp: Found remote shell prompt on ‘localhost’
> Tramp: Opening connection for localhost using ssh...done
> tramp-handle-access-file: Reading directory: No such file or directory 
> /ssh:localhost:/root/
> Configured using:
>  'configure --build=x86_64-redhat-linux-gnu
>  --host=x86_64-redhat-linux-gnu --program-prefix=
>  --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
>  --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
>  --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
>  --libexecdir=/usr/libexec --localstatedir=/var
>  --sharedstatedir=/var/lib --mandir=/usr/share/man
>  --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
>  --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
>  --with-gpm=no --with-xwidgets --with-modules --with-harfbuzz
>  --with-cairo --with-json build_alias=x86_64-redhat-linux-gnu
>  host_alias=x86_64-redhat-linux-gnu CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2
>  -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
>  -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
>  -Wp,-D_GLIBCXX_ASSERTIONS
>  -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
>  -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
>  -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
>  LDFLAGS=-Wl,-z,relro
>  PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'
>
> Configured features:
> XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
> INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
> ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
> LIBSYSTEMD JSON PDUMPER GMP
>
> Important settings:
>   value of $LC_MONETARY: en_US.UTF-8
>   value of $LC_NUMERIC: en_US.UTF-8
>   value of $LC_TIME: en_US.UTF-8
>   value of $LANG: en_US.utf8
>   locale-coding-system: utf-8-unix
>
> Major mode: Dired by name
>
> Minor modes in effect:
>   shell-dirtrack-mode: t
>   tooltip-mode: t
>   global-eldoc-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-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
>   buffer-read-only: t
>   line-number-mode: t
>   transient-mark-mode: t
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort mail-extr emacsbug message rmc puny rfc822 mml easymenu
> mml-sec epa derived epg epg-config gnus-util rmail rmail-loaddefs
> text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
> mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
> mm-util mail-prsvr mail-utils tramp-cmds dired dired-loaddefs tramp-sh
> tramp-cache tramp tramp-loaddefs trampver tramp-integration files-x
> tramp-compat shell pcomplete comint ansi-color ring parse-time iso8601
> time-date ls-lisp format-spec auth-source cl-seq eieio eieio-core
> cl-macs eieio-loaddefs cl-loaddefs cl-lib password-cache json subr-x map
> seq byte-opt gv bytecomp byte-compile cconv tooltip eldoc electric
> uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
> term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
> tabulated-list replace newcomment text-mode elisp-mode lisp-mode
> prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
> select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
> term/tty-colors frame minibuffer 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 composite charscript charprop case-table epa-hook
> jka-cmpr-hook help simple abbrev obarray 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 threads dbusbind inotify dynamic-setting system-font-setting
> font-render-setting xwidget-internal cairo move-toolbar gtk x-toolkit x
> multi-tty make-network-process emacs)
>
> Memory information:
> ((conses 16 67308 9233)
>  (symbols 48 8131 1)
>  (strings 32 24241 1892)
>  (string-bytes 1 868840)
>  (vectors 16 14042)
>  (vector-slots 8 184813 11864)
>  (floats 8 40 21)
>  (intervals 56 271 0)
>  (buffers 1000 13))
>
>
> -- 
> Aleksei
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#53223: 27.2; multi-hop TRAMP with find-file-visit-truename t
>
>
>
>
> Date: 
>
> Wed, 23 Feb 2022 09:40:43 +0100
>
>
>
>
> User-agent: 
>
> Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)
>
>
>
>
> Michael Albinus <michael.albinus@gmx.de> writes:
>
> Hi Aleksei,
>
> >> It works exactly as described in the documentaion, but what is bothering me 
> >> is
> >> the difference in behaviour depending on the state of
> >> `find-file-visit-truename'. It should only affect symlink resolution, but it
> >> also changes Tramp behaviour.
> >>
> >> If `find-file-visit-truename' is set to nil, then Tramp is able to revert the
> >> buffer and add a multi-hop definition back to `tramp-default-proxies-alist'.
> >> If `find-file-visit-truename' is set to t, then it doesn't work. Shouldn't 
> >> the
> >> buffer somehow preserve the full path?
> >
> > It isn't just a find-file-visit-truename problem. Tramp cleans up ad-hoc
> > multi-hop proxies when tramp-cleanup-all-connections is performed. This
> > could happen for many different Tramp file name operations, not just
> > file truenames. It is sheer luck for you that the example works when you
> > haven't set find-file-visit-truename.
> >
> > If you replace tramp-cleanup-all-connections by tramp-cleanup-this-connection
> > in your example, it works as expected.
>
> No further comment, so I close this bug.
>
> Best regards, Michael.
>
>
> --- End Message ---