fuse: mount failed: Permission denied when using neovim as MANPAGER

[Gelio]

Neovim version (nvim -v)

v0.6.0-dev+220-gdb695cc4c

Vim (not Nvim) behaves the same?

no clue

Operating system/version

Ubuntu 20.04 LTS

Terminal name/version

kitty 0.23.1

$TERM environment variable

xterm-kitty

Installation

appimage

How to reproduce the issue

1. Install neovim appimage
2. Set MANPAGER variable according to Following HEAD: breaking changes on master #14090 (comment)
3. Run man ls

Expected behavior

Neovim opens with the man page for ls

Actual behavior

There is an error about mounting the appimage:

13:26 $ env | grep MANPAGER
MANPAGER=nvim +Man!
13:26 $ man ls
fuse: mount failed: Permission denied

Cannot mount AppImage, please check your FUSE setup.
You might still be able to extract the contents of this AppImage
if you run it with the --appimage-extract option.
See https://github.com/AppImage/AppImageKit/wiki/FUSE
for more information
open dir error: No such file or directory
man: command exited with status 127: sed -e '/^[[:space:]]*$/{ N; /^[[:space:]]*\n[[:space:]]*$/D; }' | LESS=-ix8RmPm Manual page ls(1) ?ltline %lt?L/%L.:byte %bB?s/%s..?e (END):?pB %pB\%.. (press h for help or q to quit)$PM Manual page ls(1) ?ltline %lt?L/%L.:byte %bB?s/%s..?e (END):?pB %pB\%.. (press h for help or q to quit)$ MAN_PN=ls(1) nvim +Man!

The same error occurs for other man pages (pwd, echo).

Using the :Man ls command after neovim is open works fine.

[justinmk]

has nothing to do with Nvim. Likely just a quirk of using any appimage with MANPAGER

[Gelio]

Thanks for pointing that out. I switched to using a regular binary and it works fine

[jrowlingson]

Ran into this when attempting to use the nvim.appimage (since the .deb release was removed #22773). I was able to workaround w/ --appimage-extract and symlinking the bin.

$ man -V
man 2.9.4

[treequin]

Ran into this today. I got it to work by combining the two commands in this SE answer.
export MANPAGER='nvim.appimage --appimage-extract-and-run +Man!'