Fix tar.7z for 7zip

[2387skju]

Fix this bug: Non working .tar.7z
Effected distributions: Debian, Ubuntu, Arch Linux ?, Fedora (mostly).
These distributions does not have the original commands 7zz 7zzs installed anymore (or not at default).
Therefore the legacy p7zip will be false detected:

if (g_strcmp0 (comm_tar->compress_command, "7zzs") != 0 && g_strcmp0 (comm_tar->compress_command, "7zz") != 0)
  fr_process_add_arg (comm->process, "-l"); // only valid for legacy p7zip

p7zip was dropped by mostly all distributions. So, we should be able to remove it safety.
Alternative: we can improve the p7zip detection: see here a working solution. But I prefer to drop it.

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More details

List distributions: which are effected / non-effected:

distribution	bug effected	has commands
Debian 13	yes (tested)	7z 7za 7zr p7zip
Ubuntu 24.04	yes (tested)	7z 7za 7zr p7zip
ArchLinux / Manjaro	yes (not tested)	7z 7za 7zr
fedora 44	yes (tested)	7z is the only one on live-CD ; Each 7z* have an separated own package. (only tested with live-CD)
OpenSuse	no (tested)	7z 7za 7zr p7zip 7zz
alphine Linux	no	7z 7zz
solus	no	7z 7za 7zr 7zz
gentoo	no	7z 7za 7zr 7zz
void linux	no	7z 7za 7zr 7zz
FreeBSD / GhostBSD	no	7z 7zz
Guix	?

List distributions: which dropped p7zip:

distribution	year removed, or first year without
FreeBSD (/ GhostBSD )	2022
Void Linux	2022
alphine Linux	2023
Arch Linux / Manjaro	2024 ~
Ubuntu 24.04	2024
OpenSuse 16.0	2025
Debian 13	2025
guix	2025
Fedora 44	2026
Solus	2026
gentoo	2026 (15.08.2026)

List distributions: which still has p7zip:

distribution	has p7zip	has 7zip	year
salix 15 / Slackware?	p7zip	no	last distribution release 2022 ; last p7zip version from 2022 (=outdated)
NetBSD 11	p7zip	7zip	last distribution release 30.06.2026 ; p7zip seems the very very outdated version from year 2016 ( and not from newer following-up source ).
openindiana	p7zip	7zip	Year 2025: "expect ... p7zip will be removed..." ; last p7zip version from 2025 ;

Note: If simultaneous p7zip & 7zip are installed: everything is OK. 7zz will be preferred, so this patch will correct work.

[vkareh]

This looks fine. It's not so much dropping p7zip support as it's dropping support for the -l flag, which is specific to p7zip, but all other 7z variants reject.

However, there's still a stray -l being added in the fr-command-7z.c file that you should remove as well.

[vkareh]

Prior art: https://gitlab.gnome.org/GNOME/file-roller/-/commit/89a1fcf3

[2387skju]

fr-command-7z.c :

Yes, I saw this also.

But, I wasn't able to provoke that problem here with a 7z file. ((I don't know why. ; And don't read / understand so much code of Engrampa currently.)) So, currently I wouldn't able to test my fix here.

This different to file-roller is a bit confusing:

• We use the old recursive
• file-roller use follow_links

So, I thought:

1. First we should backport follow_links ("added option to follow symbolic links") ((maybe I will take a look at)) ,
2. then we can remove p7zip also in fr-command-7z.c.

[2387skju]

fr-command-7z.c :

OK, all clear.
Just the incomplete port of the variable / feature follow_links irritated me.
I've added this code commented out, for future use.

Feel free, to reduce my long commit message :-)

With kind regards.