bug#74219: 29.4; TRAMP uses the same ad-hoc proxy for every docker container on remote hosts

bug#74219: 29.4; TRAMP uses the same ad-hoc proxy for every docker container on remote hosts

[Artem Smushkov]

[-- Attachment #1: Type: text/plain, Size: 28268 bytes --]

I need to access some number of similarly named docker containers on
different remote hosts. For example I run

cd "/<ssh:host1|docker:container_name:/>"

in eshell, run some commands there, then I may run

cd "/<ssh:host2|docker:container_name:/>"

and run some commands there, etc. Emacs lisp functions (like cd, ls,
find-file, dired, etc) work as expected, but when I run some executable
there (bash, python, etc) it always connects to the same host no matter
what I specified in "cd" command previously. The workaround to make
things work is to run

(setq tramp-default-proxies-alist nil)

before switching to different host.


In GNU Emacs 29.4 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
 3.24.42, cairo version 1.18.0) of 2024-07-16 built on
 27527c2e06f843c0962737354e0b3cf7
System Description: Fedora Linux 40.20241103.0 (Sway Atomic)

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 --runstatedir=/run
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-cairo --with-dbus --with-gif
 --with-gpm=no --with-harfbuzz --with-jpeg --with-json --with-modules
 --with-native-compilation=aot --with-pgtk --with-png --with-rsvg
 --with-sqlite3 --with-tiff --with-tree-sitter --with-webp --with-xpm
 --with-xwidgets build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2
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 -pipe -Wall -Werror=format-security
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 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64
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 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig CXX=g++
 'CXXFLAGS=-O2 -flto=auto -ffat-lto-objects -fexceptions -g
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 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
 -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer ''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
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  global-evil-collection-unimpaired-mode: t
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  global-font-lock-mode: t
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/usr/share/emacs/29.4/lisp/org/ob-java
/var/home/templarrr/.emacs.d/straight/build/org/ob-haskell hides 
/usr/share/emacs/29.4/lisp/org/ob-haskell
/var/home/templarrr/.emacs.d/straight/build/org/ob-groovy hides 
/usr/share/emacs/29.4/lisp/org/ob-groovy
/var/home/templarrr/.emacs.d/straight/build/org/ob-gnuplot hides 
/usr/share/emacs/29.4/lisp/org/ob-gnuplot
/var/home/templarrr/.emacs.d/straight/build/org/ob-fortran hides 
/usr/share/emacs/29.4/lisp/org/ob-fortran
/var/home/templarrr/.emacs.d/straight/build/org/ob-forth hides 
/usr/share/emacs/29.4/lisp/org/ob-forth
/var/home/templarrr/.emacs.d/straight/build/org/ob-exp hides 
/usr/share/emacs/29.4/lisp/org/ob-exp
/var/home/templarrr/.emacs.d/straight/build/org/ob-eval hides 
/usr/share/emacs/29.4/lisp/org/ob-eval
/var/home/templarrr/.emacs.d/straight/build/org/ob-eshell hides 
/usr/share/emacs/29.4/lisp/org/ob-eshell
/var/home/templarrr/.emacs.d/straight/build/org/ob-emacs-lisp hides 
/usr/share/emacs/29.4/lisp/org/ob-emacs-lisp
/var/home/templarrr/.emacs.d/straight/build/org/ob-dot hides 
/usr/share/emacs/29.4/lisp/org/ob-dot
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/usr/share/emacs/29.4/lisp/org/ob-clojure
/var/home/templarrr/.emacs.d/straight/build/org/ob-calc hides 
/usr/share/emacs/29.4/lisp/org/ob-calc
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/usr/share/emacs/29.4/lisp/org/ob-awk
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/usr/share/emacs/29.4/lisp/org/ob-R
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/usr/share/emacs/29.4/lisp/org/ob-C
/var/home/templarrr/.emacs.d/straight/build/seq/seq hides 
/usr/share/emacs/29.4/lisp/emacs-lisp/seq
/var/home/templarrr/.emacs.d/straight/build/map/map hides 
/usr/share/emacs/29.4/lisp/emacs-lisp/map
/var/home/templarrr/.emacs.d/straight/build/eldoc/eldoc hides 
/usr/share/emacs/29.4/lisp/emacs-lisp/eldoc

Features:
(shadow sort mail-extr emacsbug vc-src vc-sccs vc-svn vc-cvs vc-rcs
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mule-util evil-collection-consult consult magit-bookmark
evil-collection-bookmark bookmark windmove tabify org-datetree
org-capture avy gptel-curl pcmpl-unix vc-hg vc-bzr eglot-booster
evil-collection-eglot eglot external-completion jsonrpc
evil-collection-xref xref evil-collection-flymake flymake seq-25
track-changes evil-collection-ert ert ewoc evil-collection-debug debug
backtrace evil-collection-compile compile em-unix em-term em-script
em-ls em-hist em-pred em-glob em-extpipe em-cmpl em-dirs em-basic
em-banner org-indent visual-fill-column org-modern oc-basic ol-eww
evil-collection-eww eww url-queue mm-url ol-rmail ol-mhe ol-irc ol-info
ol-gnus nnselect gnus-art mm-uu mml2015 mm-view mml-smime smime gnutls
dig gnus-sum shr pixel-fill kinsoku url-file svg dom gnus-group
gnus-undo gnus-start gnus-dbus dbus xml gnus-cloud nnimap nnmail
mail-source utf7 nnoo gnus-spec gnus-int gnus-range gnus-win
evil-collection-gnus gnus nnheader range wid-edit ol-docview
evil-collection-doc-view doc-view jka-compr evil-collection-image
image-mode exif ol-bibtex bibtex ol-bbdb ol-w3m ol-doi org-link-doi
evil-collection-vc-git vc-git vc-dispatcher pp tramp-cache time-stamp
tramp-sh pulse rainbow-delimiters autopair advice delsel .emacs
git-auto-commit-mode git-auto-commit-mode-autoloads org-ql-autoloads
peg-autoloads ov-autoloads org-super-agenda-autoloads ts-autoloads
ht-autoloads map-autoloads ob-python evil-collection-python python
project org-tempo tempo gptel-org evil-org-agenda evil-org org-element
org-persist xdg org-id org-refile org-element-ast inline avl-tree
evil-collection-org org ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-macro org-src ob-comint org-pcomplete org-list org-footnote
org-faces org-entities evil-collection-outline noutline outline
ob-emacs-lisp ob-core ob-eval org-cycle org-table ol org-fold
org-fold-core org-keys oc org-loaddefs find-func
evil-collection-calendar cal-menu calendar cal-loaddefs org-version
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gptel gptel-openai gptel-autoloads eshell-up eshell-up-autoloads
eshell-syntax-highlighting em-alias eshell-syntax-highlighting-autoloads
evil-collection-eshell em-prompt eshell esh-var esh-mode esh-cmd
generator esh-ext esh-opt esh-proc esh-io esh-arg esh-module esh-groups
esh-util evil-collection-eat eat term/xterm xterm evil-collection-term
term disp-table ehelp color eat-autoloads consult-autoloads pcase
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magit-tag magit-merge magit-branch magit-reset magit-files magit-refs
magit-status magit evil-collection-package-menu package url-handlers
evil-collection-magit-repos magit-repos magit-apply magit-wip magit-log
which-func evil-collection-imenu imenu magit-diff smerge-mode diff
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log-edit message sendmail yank-media puny rfc822 mml mml-sec
evil-collection-epa epa derived epg rfc6068 epg-config gnus-util
text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils
gmm-utils mailheader pcvs-util add-log magit-core magit-autorevert
magit-margin magit-transient magit-process with-editor server magit-mode
transient browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util url-parse
url-vars mailcap benchmark magit-git magit-base
evil-collection-magit-section magit-section cursor-sensor crm
magit-autoloads with-editor-autoloads transient-autoloads
magit-section-autoloads nerd-icons-corfu nerd-icons-corfu-autoloads
corfu-popupinfo evil-collection-corfu corfu cus-load corfu-autoloads
docker-compose-mode docker-compose-mode-autoloads yaml-mode-autoloads
dockerfile-mode evil-collection-sh-script sh-script smie executable
dockerfile-mode-autoloads vue-mode-autoloads edit-indirect-autoloads
ssass-mode-autoloads vue-html-mode-autoloads mmm-mode-autoloads
eglot-booster-autoloads eglot-autoloads track-changes-autoloads
jsonrpc-autoloads flymake-autoloads project-autoloads xref-autoloads
external-completion-autoloads eldoc-autoloads autopair-autoloads
rainbow-delimiters-autoloads treesit-auto treesit treesit-auto-autoloads
marginalia marginalia-autoloads orderless orderless-autoloads savehist
evil-collection-vertico vertico vertico-autoloads avy-autoloads
use-package-bind-key bind-key easy-mmode doom-themes-ext-org
doom-themes-ext-visual-bell face-remap doom-dracula-theme doom-themes
doom-themes-base doom-themes-autoloads doom-modeline
doom-modeline-segments doom-modeline-env doom-modeline-core shrink-path
f s dash compat compat-30 doom-modeline-autoloads shrink-path-autoloads
f-autoloads dash-autoloads s-autoloads compat-autoloads
evil-collection-info info seq-autoloads nerd-icons nerd-icons-faces
nerd-icons-data nerd-icons-data-mdicon nerd-icons-data-flicon
nerd-icons-data-codicon nerd-icons-data-devicon nerd-icons-data-sucicon
nerd-icons-data-wicon nerd-icons-data-faicon nerd-icons-data-powerline
nerd-icons-data-octicon nerd-icons-data-pomicon nerd-icons-data-ipsicon
nerd-icons-autoloads evil-collection-which-key which-key
which-key-autoloads use-package-diminish tramp tramp-loaddefs trampver
tramp-integration files-x tramp-compat shell pcomplete
evil-collection-comint comint ansi-osc parse-time iso8601 time-date
format-spec auth-source eieio eieio-core password-cache json ansi-color
gcmh gcmh-autoloads autorevert filenotify general general-autoloads
evil-org-autoloads use-package-ensure evil-collection-unimpaired
evil-collection-tabulated-list evil-collection-tab-bar
evil-collection-simple evil-collection-replace
evil-collection-process-menu evil-collection-indent evil-collection-help
evil-collection-elisp-mode evil-collection-eldoc evil-collection-dired
evil-collection-buff-menu evil-collection annalist
evil-collection-autoloads annalist-autoloads evil evil-integration
evil-maps evil-commands reveal evil-jumps evil-command-window evil-types
evil-search evil-ex evil-macros evil-repeat evil-states evil-core comp
comp-cstr warnings icons rx evil-common thingatpt rect evil-vars ring
edmacro kmacro evil-autoloads goto-chg-autoloads finder-inf
dired-hide-dotfiles-autoloads diredfl-autoloads dired-single
dired-single-autoloads all-the-icons-dired map byte-opt all-the-icons
all-the-icons-faces data-material data-weathericons data-octicons
data-fileicons data-faicons data-alltheicons dired dired-loaddefs
all-the-icons-dired-autoloads all-the-icons-autoloads use-package-core
display-line-numbers use-package-autoloads bind-key-autoloads
straight-autoloads cl-seq cl-extra help-mode straight subr-x cl-macs gv
cl-loaddefs cl-lib bytecomp byte-compile rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/pgtk-win pgtk-win term/common-win pgtk-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine 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 emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads
xwidget-internal dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo gtk pgtk multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 910410 584255)
 (symbols 48 46732 3)
 (strings 32 203349 48898)
 (string-bytes 1 7434336)
 (vectors 16 110076)
 (vector-slots 8 2444820 715504)
 (floats 8 1489 3472)
 (intervals 56 42025 50370)
 (buffers 984 63))



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bug#74219: 29.4; TRAMP uses the same ad-hoc proxy for every docker container on remote hosts

[Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Artem Smushkov <artyom.smushkov@gmail.com> writes:

Hi Artem,

your subject isn't correct. True is "Tramp uses the same ad-hoc proxy
for every docker container with the same name on remote hosts".

> I need to access some number of similarly named docker containers on
> different remote hosts. For example I run
>
> cd "/ssh:host1|docker:container_name:/"
>
> in eshell, run some commands there, then I may run
>
> cd "/ssh:host2|docker:container_name:/"
>
> and run some commands there, etc. Emacs lisp functions (like cd, ls,
> find-file, dired, etc) work as expected, but when I run some
> executable
> there (bash, python, etc) it always connects to the same host no
> matter
> what I specified in "cd" command previously. The workaround to make
> things work is to run
>
> (setq tramp-default-proxies-alist nil)
>
> before switching to different host.

That's not possible with Tramp. Not with the current design. The proxy
definitions are kept internally, and they apply in reverse order of
their appearance in the remote file names.

After you have accessed "/ssh:host1|docker:container_name:", Tramp
caches the information, that the remote host "/docker:container_name:"
is reachable via "/ssh:host1:". You can even use the short form
"/docker:container_name:" now, and Tramp remembers the hops.

When you give a different multi-hop remote file name, like
"/ssh:host2|docker:container_name:", Tramp parses from the end, and it
detects, that it should use the hop "/ssh:host1:" as proxy. No further
check. That's why you see the observed behavior.

One could argue that this is an error. I'm not so sure, it is rather a
consequence of the design. Proxy declarations were introduced in Tramp by
means of configuring tramp-default-proxies-alist. This list is organized
to detect proxy hops by starting with the final, target host, and adding
the proxies to pass in order to reach that target. People found the
configuration of that user option too complex, and that's why ad-hoc
multi-hop remote file names have been added years later. But the
principle has been kept.

One possible mitigation is to set tramp-default-proxies-alist to nil
before using different ad-hoc multi-hop file names. However, this is too
drastic in my mind, because you will lose *all* specifications there,
even for other multi-hops.

Another, and better, solution is to use different target names. Do you
need to give the containers the very same name "container_name" on both
"host1" and "host2"? If you would give them different names, the problem
doesn't exist.

Best regards, Michael.

bug#74219: 29.4; TRAMP uses the same ad-hoc proxy for every docker container on remote hosts

[Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Michael Albinus <michael.albinus@gmx.de> writes:

Hi Artem,

> That's not possible with Tramp. Not with the current design. The proxy
> definitions are kept internally, and they apply in reverse order of
> their appearance in the remote file names.

I've checked the implementation, and it looks like adding this feature
is not as expensive as I thought. So I have implemented it. Pushed to
both Emacs and Tramp git repo, master branch.

The Tramp manual has a new subsection "5.4.1 Using different proxies for
the same destination" which explains this. In short, you must set
tramp-show-ad-hoc-proxies to t.

Do you have a chance to test it?

Best regards, Michael.

bug#74219: 29.4; TRAMP uses the same ad-hoc proxy for every docker container on remote hosts

[Artem Smushkov]

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Hi Michael,

Thank you a lot! I will test it today or tomorrow.

On Sat, Nov 9 2024 at 10:40:37 AM +01:00:00, Michael Albinus 
<michael.albinus@gmx.de> wrote:
> Michael Albinus <michael.albinus@gmx.de 
> <mailto:michael.albinus@gmx.de>> writes:
> 
> Hi Artem,
> 
>>  That's not possible with Tramp. Not with the current design. The 
>> proxy
>>  definitions are kept internally, and they apply in reverse order of
>>  their appearance in the remote file names.
> 
> I've checked the implementation, and it looks like adding this feature
> is not as expensive as I thought. So I have implemented it. Pushed to
> both Emacs and Tramp git repo, master branch.
> 
> The Tramp manual has a new subsection "5.4.1 Using different proxies 
> for
> the same destination" which explains this. In short, you must set
> tramp-show-ad-hoc-proxies to t.
> 
> Do you have a chance to test it?
> 
> Best regards, Michael.


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