I have an old application, EagleCAD, from 2014, a 32bit app, I managed to install it on my linux (Debian based, 64bits) and it works fine, but I had to look for and install some lib manually.
How can I package all this, the bin and libs, into one that I could easily re-install on about any distro? AppImage? Flatpak? Snap?
$ ldd ./eagle
linux-gate.so.1 (0xf7ef4000)
libXrender.so.1 => /lib/i386-linux-gnu/libXrender.so.1 (0xf7ec4000)
libXrandr.so.2 => /lib/i386-linux-gnu/libXrandr.so.2 (0xf7eb5000)
libXcursor.so.1 => /lib/i386-linux-gnu/libXcursor.so.1 (0xf7ea8000)
libfreetype.so.6 => /lib/i386-linux-gnu/libfreetype.so.6 (0xf7dd8000)
libfontconfig.so.1 => /lib/i386-linux-gnu/libfontconfig.so.1 (0xf7d85000)
libXext.so.6 => /lib/i386-linux-gnu/libXext.so.6 (0xf7d6f000)
libX11.so.6 => /lib/i386-linux-gnu/libX11.so.6 (0xf7c1d000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf7c18000)
libXi.so.6 => /lib/i386-linux-gnu/libXi.so.6 (0xf7c03000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7bfc000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf7bf7000)
libssl.so.1.0.0 => /lib/i386-linux-gnu/libssl.so.1.0.0 (0xf7b8a000)
libcrypto.so.1.0.0 => /lib/i386-linux-gnu/libcrypto.so.1.0.0 (0xf798b000)
libstdc++.so.6 => /lib/i386-linux-gnu/libstdc++.so.6 (0xf7600000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf7886000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf785f000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7200000)
/lib/ld-linux.so.2 (0xf7ef6000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xf7842000)
libXfixes.so.3 => /lib/i386-linux-gnu/libXfixes.so.3 (0xf783a000)
libpng16.so.16 => /lib/i386-linux-gnu/libpng16.so.16 (0xf75c3000)
libbrotlidec.so.1 => /lib/i386-linux-gnu/libbrotlidec.so.1 (0xf782a000)
libexpat.so.1 => /lib/i386-linux-gnu/libexpat.so.1 (0xf7597000)
libxcb.so.1 => /lib/i386-linux-gnu/libxcb.so.1 (0xf7569000)
libbrotlicommon.so.1 => /lib/i386-linux-gnu/libbrotlicommon.so.1 (0xf7546000)
libXau.so.6 => /lib/i386-linux-gnu/libXau.so.6 (0xf7825000)
libXdmcp.so.6 => /lib/i386-linux-gnu/libXdmcp.so.6 (0xf753f000)
libbsd.so.0 => /lib/i386-linux-gnu/libbsd.so.0 (0xf7528000)
libmd.so.0 => /lib/i386-linux-gnu/libmd.so.0 (0xf7519000)
Yeah using LD_LIBRARY_PATH or RPATH etc is how I did something similar years ago, but I think there is a more modern way to do it
The modern way to run 10 year old binary applications is "don't", all of the technologies you listed are designed with a security focus and that means regular updates.
It's an offline application, I don't care
The point is nobody makes deployment technologies specifically designed for your "run an old application" use case.
Me, I'm doing it, for myself, easier to install whenever I change distro, take a laptop, etc It's also to learn how to do it, I don't know how to create a snap/flatpak image, hence the post. And it has nothing to do with an old app, it's to have an app and all its dependencies in a container
Most of these technologies combine some sort of sandboxing with the containerization part and the app has to be specifically adapted to use different ways to access data and system services where it needs to break the sandbox barrier.