Discussion
GRUB bundles a support library for its `grub-install` command, including:
* A utility branching over a given "key" to concatenate on the appropriate subpath onto the given directory-path.
* Copy a file into place a bufferfull at a time with extreme care.
* A wrapper which might alternatively invoke a configured compression function with debug logging.
* Check a for filepath separator, handling Windows specially.
* Carefully create a directory & any parents if necessary.
1/5?
* Choose modules to load for decompressing that compressed data.
* Assemble commandline flags & defer to `grub_install_generate_image()`.
* A wrapper which transiently opens a destination for it.
* Copy over files which match a certain extension.
* Copy over all files in a directory.
* A couple routines that (via a helper) locates the locale dir & copies over files with certain extensions from it.
* A lookup table with wrappers describing supported platforms.
3/5?
And there's a sizable over-arching routine which copies certain files into place, using several of the other helpers including all the choosen GRUB modules.
As well as a routine for outputting a shell-script declaring envvars describing the chosen platform, & a routine to recursively delete files from the target directory.
3.5/3.5 Fin for today! Tomorrow: `grub-mkfont`!
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* Check whether a filename ends with a certain extension.
* Flag that a backup should be created upon exit, at which point (via a repeatedly-called helper) it renames various files into place.
* Invokes that same helper twice & (via another helper) registers that `atexit()` callback with some globals set.
* Check module list against an allow-list.
* Push, pop, & normalize an array of modules to load.
* Handle commandline flags, primarily to set the compression function.
2/5?