Doubt about grub updates

Hi fellow Archers,
I've been wondering lately about a detail I haven't found (or maybe I haven't been smart enough to find) on the Wiki nor elsewhere. Is it necessary to perform a grub-install and/or a grub-mkconfig whenever grub gets an update? Coming from Debian (several years on testing/sid), I'm surprised not to see any "updating grub" process when pacman is running. As little as I know about PKGBUILDs and Arch packaging in general, I've looked at the package's source and I've concluded that it does not perform any of both commands, but it doesn't even warn you about the need of running either one of them or both. On the contrary, updating linux does perform a mkinitcpio by itself.
My intuition tells me that one should at least do the grub-mkconfig, but I'm not sure. Could you please explain me what should be the right steps when facing a grub update? And most importantly, I'd really like to know why Arch doesn't update grub automatically; I'm sure there must be a good reason I'm missing.
Thanks!
Last edited by nvteighen (2014-06-05 13:24:46)

nvteighen wrote:So, in summary, it shouldn't be necessary to do grub-install and grub-mkconfig unless there's a major update to the package that includes an update to the bootloader. I guess the best practice here would be to check out the release notes for each new upstream release, as a way to diagnose whether manual intervention is needed or not.
If you don't run grub-mkconfig or grub-install, then the copy of grub in /boot won't be changed. Only the files in /usr/bin, /usr/lib and /etc (and /usr/share) are updated by pacman.
If there were bugfixes or changes in a grub module or the configuration scripts, then you should run grub-install and grub-mkconfig respectively.

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