Discussion
Studying more of the `grub-*` commands...
`grub-mkrescue` performs some OS-specific initialization, disables synchronization, locates some directories, allocates some values, preprocesses the commandline args, parses & validates commandline flags, performs some additional logging, assembles some `xorriso` args, creates a temp dir & copies files into in one of 2 codepaths, configures backup "ponr", chooses a "system area" if not already set, generates a UUID & assembles more `xorriso` args, ...
... possibly opens an output configfile & runs the `xorriso` command with some final args whilst diagnosing why it might have failed, loads some GRUB modules for installation whilst deferring to `make_image()` & in turn `grub_install_make_image_wrap()` upon particular resources, invokes another wrapper around that routine, possibly synthesizes some Mac permission files & invokes `xorriso` again, possibly synthesizes the files & invokes commands for Windows or other platforms, ...
2/5?
... repeatedly invoke wrappers around that core routine to generate several more images, cleans up, invokes a final `xorriso` command with a few final args added, & finishes cleaning up.
`grub-mklayout` performs some OS-specific init, zeroes out some values, parses commandline flags, carefully opens the source file or uses stdin, does so for output, reformats (via helper functions & lookup tables) data from input to output using a loop & multiple branches, & cleans up.
3/5?
There's a support library for verifying GRUB executables & plugins fulfill various invariants, including that they have valid symboltables & can boot correctly. I'm sure it'd be painful if GRUB didn't boot correctly...
`grub-pe2elf` ensures there's at least 1 argument, reads the given image file, opens the given output, via a suite of helpers outputs the parsed image into ELF format, & cleans up.
And as for `grub-mount`...
4/5!
`grub-mount` performs some OS-specific init, assembles args for `fuse`, parses commandline flags, inits more of GRUB, possibly sets $debug, computes a value for $root in one of 2 codepaths with possible cleanup, invokes a core routine & cleans up. That core routine iterates over disks invoking the `loopback` possibly followed by `cryptomount`, finalizes & inits several GRUB modules, opens a GRUB device, probes filesystems, registers the GRUB endpoint to invoke GRUB's routines, & cleans up.
5/5!
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