On Wednesday, February 9, 2022, mnieuw--- via Cin <cin@lists.cinelerra-gg.org> wrote:
1. Change an AppImage.
I have not tested re-compression, but as far as I know now an AppImage
is a normal zip file with the internal layout specified. Can't you just
zip the changed directory structure?

it seems appimage uses squashfs, not plain zip.. 

https://stackoverflow.com/questions/64564820/how-to-use-appimagetool-to-create-package-to-run-on-older-linux

(see log there) 

and there is header (script?) mounting image if you make it executable.. and this header somewhat limited to gzip-compressed squashfs? 

https://github.com/AppImage/AppImageKit/issues/1101
 

2. I cannot create a full AppImage on Mint 19.3 at the moment, because
the manual does not build there any more. I can build an AppImage
without the manual.

MatN

On Wed, 9 Feb 2022 10:03:00 +0100
Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:

> @MatN
> Thanks to Glitterball3
> (https://www.cinelerra-gg.org/forum/postid/2022/), Phyllis added a
> section in the manual on how to unzip an appimage so you can make
> additions and changes to it. To complete the process, I found a way to
> recompress the folders back into an appimage using the "appimagetool"
> tool. However, this program is not in the repositories of all distros
> (Fedora, for example), so it's not universal enough to put in the
> manual. We can also do compression with "linuxdeploy", but I don't
> know how to do it. Do you have any idea how to use linuxdeploy to
> recompress the "squashfs-root" folder into a new appimage?

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