The builder code imports the “(guix build utils)” module, which has some
really handy shell-like functions like “invoke” for running programs,
“substitute*” which is like “sed -i”, and “copy-recursively”, which is
like “cp -r”.

The “Unpack” section sets up the “PATH” variable for Tar, and then
invokes “tar” to unpack the tarball.

The “Configure” section replaces the references to Bash and Python with
their absolute paths in the Guix store.

The “Install” section makes the “program” file executable then copies
the code into the Guix-provided output directory.

I hope that makes sense and good luck!


-- Tim