GNU bug report logs - #73842
[PATCH] pack: Add support for AppImage pack format.

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Noé Lopez <noe <at> xn--no-cja.eu>
Cc: Josselin Poiret <dev <at> jpoiret.xyz>, 73842 <at> debbugs.gnu.org, Maxim Cournoyer <maxim.cournoyer <at> gmail.com>, Simon Tournier <zimon.toutoune <at> gmail.com>, Mathieu Othacehe <othacehe <at> gnu.org>, Noé Lopez <noelopez <at> free.fr>, Tobias Geerinckx-Rice <me <at> tobias.gr>, pelzflorian <pelzflorian <at> pelzflorian.de>, Sebastian Dümcke <code <at> sam-d.com>, Christopher Baines <guix <at> cbaines.net>
Subject: [bug#73842] [PATCH v5 2/3] pack: Add support for AppImage pack format.
Date: Fri, 15 Nov 2024 18:02:07 +0100

Hello Noé,

The patch series LGTM, and tests pass: we’re all set!

But… one thing I noticed when trying it out is that the resulting
AppImage would fail to run on relatively bare-bones non-Guix systems:

--8<---------------cut here---------------start------------->8---
$ ./2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage 
fuse: failed to exec fusermount3: No such file or directory

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
--8<---------------cut here---------------end--------------->8---

I wonder if there’s something that can be done on our side about it or
if it’s a limitation of the approach (I expect the latter: ‘fusermount’
has to be available and setuid root), in which case we could just add a
warning in the manual.

WDYT?

Interestingly, it works on my Guix System laptop, except if I strace it:

--8<---------------cut here---------------start------------->8---
$ /gnu/store/2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage 
Hello, world!
$ strace -f -o /tmp/log.strace -s 500 /gnu/store/2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage 
fusermount3: mount failed: Operation not permitted

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
$ grep 'mount(' /tmp/log.strace 
17569 mount("2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage", "/tmp/.mount_2i2l6iLZ8WYZ", "fuse.2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage", MS_RDONLY|MS_NOSUID|MS_NODEV, "fd=5,rootmode=40000,user_id=1000,group_id=998") = -1 EPERM (Operation not permitted)
17570 mount("2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage", ".", "fuse.2i2l6irl2n8q24aimfmidvlglllc4s8z-hello-appimage-pack.AppImage", MS_RDONLY|MS_NOSUID|MS_NODEV, "fd=6,rootmode=40000,user_id=1000,group_id=998") = -1 EPERM (Operation not permitted)
17571 mount("/dev/fuse", ".", "fuse", MS_RDONLY|MS_NOSUID|MS_NODEV, "fd=6,rootmode=40000,user_id=1000,group_id=998") = -1 EPERM (Operation not permitted)
--8<---------------cut here---------------end--------------->8---

Ludo’.

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