[PATCH 0/2] Allow editenv to follow symlinks to find/make grubenv

[Peter Jones]

Hi,
This is a patch series to allow grub-editenv and related utilities to
follow symbolic links when finding its config file.  This allows, for
example, the ability to have two builds of grub for different platforms
that have different prefixes set, but still use the same userland grub
utilities.

For example, in our EFI builds we'll typically have prefix set as
/EFI/fedora (on the EFI System Partition), but when you install on a BIOS
machine it'll be /boot/grub2 (which may or may not be its own mountpoint.)

With this patch, on EFI machines we can make /boot/grub2/grubenv a symlink
to /boot/efi/EFI/fedora/grubenv , and the same copy of grub-set-default will
work on both kinds of systems.

Note: I'm not entirely sure I've done the gnulib parts of the first patch
the preferred way, but they do appear to be functional.  I wound up using
"gnulib-tool --import --dir=. --lib=libgnu --source-base=grub-core/gnulib 
--m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux 
--no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files argp 
error fnmatch getdelim getline gettext progname readlink regex"
and then only adding in the parts directly related to readlink().