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stages/grub2: use static grub.cfg/grubenv files

Browse source 
Afetr discussions with Javier Martinez Canillas and Alberto Ruiz
from the grub team, it was clear that we want move to a static
configuration shipped in the grub rpm in the future. For now,
we use our own, but the aim is to use the same as upstream.

Signed-off-by: Tom Gundersen <teg@jklm.no>
This commit is contained in:
Tom Gundersen 2019-07-02 20:05:19 +02:00
parent a45f0dc8e5
commit 9f5ce324b0
1 changed files with 15 additions and 29 deletions
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44
stages/io.weldr.grub2
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@ -51,37 +51,23 @@ def main(tree, input_dir, options):
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_DEFAULT=0\n"
"GRUB_ENABLE_BLSCFG=true\n")
# Create a working directory on a tmpfs, maybe we should implicitly
# always do this.
with tempfile.TemporaryDirectory() as workdir:
image = f"{workdir}/image.raw"
mountpoint = f"{workdir}/mnt"
# Create an empty image file of the right size
size = int(math.ceil(tree_size(tree) * 1.2 / 512) * 512)
subprocess.run(["truncate", "--size", str(size), image], check=True)
# Mount the created image as a loopback device
with loop_device(image) as loop:
# Populate the first partition of the image with an ext4 fs and fill it with the contents of the
# tree we are operating on.
subprocess.run(["mkfs.ext4", "-d", tree, "-U", root_fs_uuid, loop], check=True)
# Mount the partition. The contents is now exactly the same as the input tree, with the only
# difference that when it inspects its own filesystem it will see what has been configured,
# rather than a tmpfs.
with mount(loop, mountpoint):
# Run the tool in the image we created.
with mount_api(mountpoint):
subprocess.run(["chroot", mountpoint, "grub2-mkconfig", "--output=/boot/grub2/grub.cfg"], check=True)
# Copy the entire contents of the image back on top of the input tree, capturing all the changes
# the tool performed.
shutil.rmtree(tree, ignore_errors=True)
subprocess.run(["cp", "-a", f"{mountpoint}/.", tree], check=True)
os.makedirs(f"{tree}/boot/grub2", exist_ok=True)
with open(f"{tree}/boot/grub2/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} ro\n")
with open(f"{tree}/boot/grub2/grub.cfg", "w") as cfg:
cfg.write("set timeout=0\n"
"load_env\n"
"search --no-floppy --fs-uuid --set=root ${GRUB2_ROOT_FS_UUID}\n"
"search --no-floppy --fs-uuid --set=boot ${GRUB2_BOOT_FS_UUID}\n"
"function load_video {\n"
" insmod all_video\n"
"}\n"
"blscfg\n")
if __name__ == '__main__':
args = json.load(sys.stdin)