Add a bootstrap script that can bootstrap Python, EasyBuild and Lmod

[ocaisa]

No description provided.

[ocaisa]

Relies on #1880 for offline reproducability

[ocaisa]

@fgeorgatos Your dream has finally come true

[ocaisa]

This needs to be removed (and the above uncommented) when #1880 is merged

[ocaisa]

The usage is simple: ./Python_EasyBuild_Lmod_bootstrap.sh <Target Dir>

[ocaisa]

Need to ensure MODULESHOME is defined before doing this

[ocaisa]

@boegel Can I get your opinion on something. I ran this on an absolutely minimal system and there are a few issues. First up you need tcl, zlib-devel and openssl-devel to get a functional Python and the ability to use the TCL module command.
Next is that you need a C++ compiler to pass the sanity checks of ncurses, which is a dep of Lua. Then ncurses needs to be loaded for Lua to work. I can create an ncurses build that doesn't require C++ and statically link that to Lua with a config option which means this script should work on a bare system with those few packages. The problem would be if there are more things built with dummy that actually require g++ to exist (specifically the deps of GCCcore), if so then it's a bit of a waste of time getting around it since the end result is not really functional. Opinion?

[ocaisa]

I went ahead and tested, I fall over at binutils. I could probably get a build out I think but might be a bit of effort.

[ocaisa]

Ok, binutils will build if I disable ld.gold so it is possible to forego a C++ compiler and build GCCcore

[ocaisa]

Aw forget it, GCCcore is failing now, looks like no way around it:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63509

[boegel]

@ocaisa the latest versions of GCC are (partially) written in C++, so I think you'll have a hard time getting that to build without a C++ compiler on the system...

[boegel]

@ocaisa unless you're willing to build on old version of GCC (that is still C-only), just to provide working C++ compiler, then you can probably get away with only requiring a C compiler on the system