bug#75304: 29.4; sshfs fails to mount when run by eshell and -f isn't passed

bug#75304: 29.4; sshfs fails to mount when run by eshell and -f isn't passed

[Richard Sent]

Hi all,

When sshfs is invoked by eshell and allowed to daemonize (default),
sshfs fails to mount the desired target directory. This seems to be
caused by a SIGTERM signal being sent after sshfs daemonizes and enters
the main fuse loop. (The return value of fuse_loop_mt is 15, which
matches the return value when the process actually receives SIGTERM.
Confirmed both by testing and documentation at [1].)

If I set process-connection-type to nil, sshfs works as expected. This
isn't ideal because it can cause breakage elsewhere (e.g. ripgrep).

This issue sounds similar to a previous one with xdg-open [2].
However, xdg-open's behavior seems to have been fixed in Emacs 29 ($
xdg-open file.txt works on my machine), while this bug is present on 29.

For what it's worth, the problem also occurs when sshfs is invoked by a
wrapper script and not eshell directly.

Tested in -Q.

[1]: https://libfuse.github.io/doxygen/fuse-3_810_84_2include_2fuse__lowlevel_8h.html#a5f1e538aa3287e251afbe985438c4249
[2]: https://lists.gnu.org/archive/html/bug-gnu-emacs/2022-11/msg01768.html


In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
cairo version 1.18.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101014
System Description: Guix System

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/6nqyia3ra10sgd1ppzk2047ncbzjwhff-bash-minimal-5.1.16/bin/bash
 SHELL=/gnu/store/6nqyia3ra10sgd1ppzk2047ncbzjwhff-bash-minimal-5.1.16/bin/bash
 --prefix=/gnu/store/qyny35x285i7pcfhysvlhcfznkrznjfc-emacs-29.4
 --enable-fast-install --with-cairo --with-modules
 --with-native-compilation=aot --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 XPM
GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: /home/richard/.guix-home/profile/share/emacs/site-lisp:/gnu/store/qyny35x285i7pcfhysvlhcfznkrznjfc-emacs-29.4/share/emacs/29.4/lisp
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Eshell

Minor modes in effect:
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  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
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  erc-match-mode: t
  erc-button-mode: t
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  emms-mode-line-mode: t
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  eshell-hist-mode: t
  eshell-pred-mode: t
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  all-the-icons-completion-mode: t
  which-key-mode: t
  display-time-mode: t
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  eat-eshell-mode: t
  eat--eshell-local-mode: t
  electric-pair-mode: t
  server-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  display-battery-mode: t
  corfu-popupinfo-mode: t
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  savehist-mode: t
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  vertico-mode: t
  override-global-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
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  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/gnu/store/zjb0j6cfjrp5qwp40yyz6jg1ch2dmcqm-emacs-transient-0.8.1/share/emacs/site-lisp/transient-0.8.1/transient hides /gnu/store/qyny35x285i7pcfhysvlhcfznkrznjfc-emacs-29.4/share/emacs/29.4/lisp/transient
/gnu/store/8pr1yy7pcai1g1r52c2xcha58nmbi32a-emacs-soap-client-3.2.3/share/emacs/site-lisp/soap-client-3.2.3/soap-inspect hides /gnu/store/qyny35x285i7pcfhysvlhcfznkrznjfc-emacs-29.4/share/emacs/29.4/lisp/net/soap-inspect
/gnu/store/8pr1yy7pcai1g1r52c2xcha58nmbi32a-emacs-soap-client-3.2.3/share/emacs/site-lisp/soap-client-3.2.3/soap-client hides /gnu/store/qyny35x285i7pcfhysvlhcfznkrznjfc-emacs-29.4/share/emacs/29.4/lisp/net/soap-client

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Memory information:
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-- 
Take it easy,
Richard Sent
Making my computer weirder one commit at a time.