issues with version 3x on rocky linux 8

[keeper791]

Hey,

Installing latest/stable via snap on RHEL8 Rocky Linux 8 works fine

but using latest/beta or pgtk/edge has the following issues:

1. A few seconds after openning emacs, the following warning is seen:

2. Everytime I click to open a file, the terminal has these errors:

I've source-compiled emacs version 30.0.90 and none of these issues were present. they're only there when installing with snap

[alexmurray]

Hey, thanks for reporting this issue and apologies for it - can you let me know in particular which revision of the snap you have tried from beta / edge as there have been a bunch of changes recently. Thanks.

[keeper791]

sure, here are some more details

I'm managing a fleet of RHEL8 servers, more particularly Rocky Linux 8.10, emacs is installed via Puppet managed snap.

We're currently on pgtk/edge , up until a couple of weeks ago we had 30.0.50 and it was working without any issues. A couple of weeks ago the channel got updated to 31.0.50, which is where we started seeing the errors I mentioned.

I then tried removing the snap and installing latest/beta (30.0.92) , but these errors are visible with this version as well.

Removed again and installed latest/stable (29.4) , works well - without any errors or issues.

My last attempt was to download .tar.gz of emacs 30.0.90, I compiled and installed it and it worked well, without errors.

[alexmurray]

Ok, I expect this may be due to the difference in where snaps are installed on non-Ubuntu distributions - I think they are not under /snap right? Can you try running the following for me:

snap run --shell emacs
echo $SNAP

Thanks.

[keeper791]

snap run --shell emacs
/snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so: undefined symbol: g_assertion_message_cmpint
Failed to load module: /snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
/lib64/libc.so.6: version GLIBC_2.33' not found (required by /snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/../../gvfs/libgvfscommon.so) Failed to load module: /snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/libgioremote-volume-monitor.so /lib64/libc.so.6: version GLIBC_2.38' not found (required by /snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so)
Failed to load module: /snap/emacs/2592/usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so

echo $SNAP
/snap/emacs/2592

[alexmurray]

Thanks - that is not what I expected (it is the same as Ubuntu, so I was hoping that the various workaround we have in the snap to support it working on older Ubuntu releases like 18.04 would also work on Rocky)... I think I may have to try and set up a rocky VM and try and debug this locally myself.

Out of interest, why do you use the pgtk branch?

[keeper791]

Thanks! we'll be very happy if the new versions work well on Rocky8!

To your question - no good reason, I think we've just set it up like that initially. I've modified our env to use latest/stable now to resume normal functionality. The main motivation now is to have future releases of latest/stable to not have the issues described in here

[alexmurray]

Ok, I got a rocky 8 VM going and can reproduce this issue. I think it is because in the snap we have the /snap/emacs/current/usr/lib/x86_64-linux-gnu/libc.so file which contains:

/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /lib/x86_64-linux-gnu/libc.so.6 /snap/emacs/current/usr/lib/x86_64-linux-gnu/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-x86-64.so.2 ) )

This works on Ubuntu but these same paths don't exist on rocky - instead they should be:

/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /lib64/libc.so.6 /snap/emacs/current/usr/lib/x86_64-linux-gnu/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-x86-64.so.2 ) )

But as the snap is a readonly file-system we can't easily do this or to my knowledge ship multiple versions of the linker script. I have tried to have the snap specify these to all come from the snap - ie, something like:

GROUP ( /snap/emacs/current/usr/lib/x86_64-linux-gnu/libc.so.6 /snap/emacs/current/usr/lib/x86_64-linux-gnu/libc_nonshared.a  AS_NEEDED ( /snap/emacs/current/usr/lib64/ld-linux-x86-64.so.2 ) )

but this doesn't work and compilation fails still on both Ubuntu and rocky. So we may have to be a bit cleverer with this hack but I don't have great ideas yet how to fix it for both... but I'll have a think.

[alexmurray]

Ok I have committed a fix which works for me locally - this should build soon and be published to the candidate channel in an hour or two - can you please test it once this becomes available? Note I only focused on fixing the native-comp issue, the GVFS-WARNING seems less critical but if this turns out to be a real issue please file another issue and I can try and look into it. Thanks.

[alexmurray]

Apologies - this is on the beta channel not candidate, and available now - if you can provide any testing that would be great.

[keeper791]

I've just tried latest/beta 30.1, I no longer see the compile errors. GVFS warnings are still there

So it looks like it's working as expected

thanks!

[alexmurray]

Thanks for confirming - I'll close this issue for now and we can follow up in #101 etc for other issues.