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stages/grub2: support for hybrid booting

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In the case that the image should support booting via EFI *and*
legacy grub, i.e. hybrid booting, the canonical grub config is
stored in /boot/grub2 just as for normal legacy booting. The
config file for efi grub is a very small one that will just look
for the partition containing the /boot/grub2/grub.cfg file and use
then set the prefix accordingly and load that file. In the hybrid
case grubenv file also will just be located in /boot/grub2 and
not in the ESP therefore the symlink that was created by the
package needs to be removed.
This commit is contained in:
Christian Kellner 2020-01-09 15:48:30 +01:00 • committed by Tom Gundersen
parent b50193f289
commit 4804632268
1 changed files with 46 additions and 11 deletions
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57
stages/org.osbuild.grub2
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@ -110,6 +110,15 @@ def write_grub_cfg(tree, path):
"blscfg\n")
def write_grub_cfg_redirect(tree, path):
"""Write a grub config pointing to the other cfg"""
print("hybrid boot support enabled. Writing alias grub config")
with open(os.path.join(tree, path), "w") as cfg:
cfg.write("search --no-floppy --set prefix --file /boot/grub2/grub.cfg\n"
"set prefix=($prefix)/boot/grub2\n"
"configfile $prefix/grub.cfg\n")
def main(tree, options):
root_fs_uuid = options["root_fs_uuid"]
kernel_opts = options.get("kernel_opts", "")
@ -120,34 +129,60 @@ def main(tree, options):
if isinstance(legacy, bool) and legacy:
legacy = "i386-pc"
# Check if hybrid boot support is requested, i.e. the resulting image
# should support booting via legacy and also UEFI. In that case the
# canonical grub.cfg and the grubenv will be in /boot/grub2. The ESP
# will only contain a small config file redirecting to the one in
# /boot/grub2 and will not have a grubenv itself.
hybrid = uefi and legacy
# Create the configuration file that determines how grub.cfg is generated.
os.makedirs(f"{tree}/etc/default", exist_ok=True)
with open(f"{tree}/etc/default/grub", "w") as default:
default.write("GRUB_TIMEOUT=0\n"
"GRUB_ENABLE_BLSCFG=true\n")
os.makedirs(f"{tree}/boot/grub2", exist_ok=True)
with open(f"{tree}/boot/grub2/grubenv", "w") as env:
grubenv = f"{tree}/boot/grub2/grubenv"
if hybrid:
# The rpm grub2-efi package will have installed a symlink from
# /boot/grub2/grubenv to the ESP. In the case of hybrid boot we
# want a single grubenv in /boot/grub2; therefore remove the link
try:
os.unlink(grubenv)
except FileNotFoundError:
pass
with open(grubenv, "w") as env:
env.write("# GRUB Environment Block\n"
f"GRUB2_ROOT_FS_UUID={root_fs_uuid}\n"
f"GRUB2_BOOT_FS_UUID={root_fs_uuid}\n"
f"kernelopts=root=UUID={root_fs_uuid} {kernel_opts}\n")
if uefi is not None:
# UEFI support:
# The following files are needed for UEFI support:
# /boot/efi/EFI/<vendor>/
# - grubenv: in the case of non-hybrid boot it should have
# been written to via the link from /boot/grub2/grubenv
# created by grub2-efi-{x64, ia32}.rpm
# - grub.cfg: needs to be generated, either the canonical one
# or a shim one that redirects to the canonical one in
# /boot/grub2 in case of hybrid boot (see above)
vendor = uefi["vendor"]
grubcfg = f"boot/efi/EFI/{vendor}/grub.cfg"
if hybrid:
write_grub_cfg_redirect(tree, grubcfg)
else:
write_grub_cfg(tree, grubcfg)
if legacy:
write_grub_cfg(tree, "boot/grub2/grub.cfg")
copy_modules(tree, legacy)
copy_font(tree)
if uefi is not None:
# UEFI support:
# The following files are needed for UEFI support:
# /boot/efi/EFI/<vendor>/{grubenv, grub.cfg}
# - grubenv should have been written to via the link from
# /boot/grub2/grubenv created by grub2-efi-{x64, ia32}.rpm
# - grub.cfg needs to be generated
vendor = uefi["vendor"]
write_grub_cfg(tree, f"boot/efi/EFI/{vendor}/grub.cfg")
return 0