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Peter Jones 0ad07e928a grub-editenv: Make grub-editenv chase symlinks including those across devices
The grub-editenv create command will wrongly overwrite /boot/grub2/grubenv
with a regular file if grubenv is a symbolic link. But instead, it should
create a new file in the path the symlink points to.

This lets /boot/grub2/grubenv be a symlink to /boot/efi/EFI/fedora/grubenv
even when they're different mount points, which allows grub2-editenv to be
the same across platforms (i.e. UEFI vs BIOS).

For example, in Fedora the GRUB EFI builds have prefix set to /EFI/fedora
(on the EFI System Partition), but for 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.

Windows doesn't implement a readlink primitive, so the current behaviour is
maintained for this operating system.

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Jonathan Lebon <jlebon@redhat.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-02-18 15:16:02 +01:00
asm-tests asm-tests/i386-pc: Check that movl is 5 bytes. 2016-09-28 20:31:04 +03:00
conf bootstrap: Add gnulib's base64 module 2020-01-10 14:26:40 +01:00
docs docs: Update info with grub.cfg netboot selection order 2020-02-18 15:12:07 +01:00
grub-core normal/main: Search for specific config files for netboot 2020-02-18 15:12:06 +01:00
include grub-editenv: Add grub_util_readlink() 2020-02-18 15:14:13 +01:00
po gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
tests syslinux: Fix syslinux_test in out-of-tree builds 2019-03-05 10:27:53 +01:00
themes/starfield Starfield theme. 2012-02-23 17:21:38 +01:00
unicode * unicode: Import Unicode 6.0 data. 2011-12-25 16:17:25 +01:00
util grub-editenv: Make grub-editenv chase symlinks including those across devices 2020-02-18 15:16:02 +01:00
.gitattributes gitattributes: Mark po/exclude.pot as binary so git won't try to diff nonprintables 2019-09-23 13:17:15 +02:00
.gitignore gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
.travis.yml travis: Add Travis CI config file 2019-02-25 14:02:06 +01:00
AUTHORS 2005-09-03 Yoshinori K. Okuji <okuji@enbug.org> 2005-09-03 16:54:27 +00:00
BUGS * BUGS: New file. 2011-01-11 00:06:01 +01:00
COPYING 2007-07-22 Yoshinori K. Okuji <okuji@enbug.org> 2007-07-21 23:32:33 +00:00
ChangeLog-2015 Autogenerate ChangeLog from git changelog. 2015-01-24 17:29:50 +01:00
INSTALL gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
Makefile.am Makefile: Allow to set file systems modules for default_payload.elf 2019-03-12 20:04:07 +01:00
Makefile.util.def grub-editenv: Make grub-editenv chase symlinks including those across devices 2020-02-18 15:16:02 +01:00
NEWS Release 2.04 2019-07-04 15:57:30 +02:00
README README: Remove dead link to the wiki 2015-11-06 04:31:23 +01:00
THANKS 2009-12-11 Robert Millan <rmh.grub@aybabtu.com> 2009-12-11 22:44:47 +00:00
TODO TODO: Remove obsolete link 2016-02-12 17:51:52 +01:00
acinclude.m4 Fix -nopie/-nopie check. 2017-01-30 19:38:55 +01:00
autogen.sh POTFILES: Don't include gnulib in grub.pot 2019-03-26 15:04:17 +01:00
bootstrap gnulib: Upgrade Gnulib and switch to bootstrap tool 2019-03-05 10:48:12 +01:00
bootstrap.conf bootstrap: Add gnulib's base64 module 2020-01-10 14:26:40 +01:00
config.h.in Remove libgcc dependency. 2015-03-03 20:50:37 +01:00
configure.ac RISC-V: Add __clzdi2 symbol 2019-09-23 13:17:15 +02:00
coreboot.cfg * coreboot.cfg: Add missing file. 2013-11-20 00:52:23 +01:00
geninit.sh automake commit without merge history 2010-05-06 11:34:04 +05:30
gentpl.py RISC-V: Add to build system 2019-02-25 14:02:05 +01:00
linguas.sh linguas: Don't skip ko.po. 2017-02-04 00:06:57 +01:00

README

This is GRUB 2, the second version of the GRand Unified Bootloader.
GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more
robust, more powerful, and more portable.

See the file NEWS for a description of recent changes to GRUB 2.

See the file INSTALL for instructions on how to build and install the
GRUB 2 data and program files.

Please visit the official web page of GRUB 2, for more information.
The URL is <http://www.gnu.org/software/grub/grub.html>.

More extensive documentation is available in the Info manual,
accessible using 'info grub' after building and installing GRUB 2.

There are a number of important user-visible differences from the
first version of GRUB, now known as GRUB Legacy. For a summary, please
see:

  info grub Introduction 'Changes from GRUB Legacy'