mkefiboot: make efi boot images using imgutils

This adds the new "mkefiboot" cmd, which creates an efiboot img in the
magical way that EFI requires. There doesn't seem to be a good tool for
this (unlike the existing tools for all the other weirdo boot image
types) so it was necessary to create one.
This commit is contained in:
Will Woods 2011-05-09 10:45:55 -04:00
parent b2b1c36167
commit 6a5851d53b

66
src/sbin/mkefiboot Executable file
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#!/usr/bin/python
# mkefiboot - a tool to make EFI boot images
# Copyright (C) 2011 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Red Hat Author(s): Will Woods <wwoods@redhat.com>
import os, tempfile, optparse
from subprocess import check_call, PIPE
from lorax.imgutils import mkdosimg, round_to_blocks, LoopDev, DMDev, dm_detach
def mkefiboot(bootdir, outfile, label):
'''Make an EFI boot image with the contents of bootdir in EFI/BOOT'''
mkdosimg(None, outfile, label, graft={'EFI/BOOT':bootdir})
def mkefidisk(efiboot, outfile):
'''Make a bootable EFI disk image out of the given EFI boot image.'''
partsize = os.path.getsize(efiboot) + 17408
disksize = round_to_blocks(17408 + partsize, 512)
with LoopDev(outfile, disksize) as loopdev:
with DMDev(loopdev, disksize) as dmdev:
check_call(["parted", "--script", "/dev/mapper/%s" % dmdev,
"mklabel", "gpt",
"unit", "b",
"mkpart", "'EFI System Partition'", "fat32", "17408", str(partsize),
"set", "1", "boot", "on"], stdout=PIPE, stderr=PIPE)
with open(efiboot, "rb") as infile:
with open("/dev/mapper/%sp1" % dmdev, "wb") as outfile:
outfile.write(infile.read())
dm_detach(dmdev+"p1")
if __name__ == '__main__':
parser = optparse.OptionParser(usage="%prog EFIBOOTDIR IMGFILE")
parser.add_option("-d", "--disk", action="store_true", default=False,
help="make a full EFI disk image")
parser.add_option("-l", "--label", action="store", default="ANACONDA",
help="filesystem label to use")
# get args
(opt, args) = parser.parse_args()
if len(args) != 2:
parser.error("need exactly two arguments")
(bootdir, outfile) = args
# sanity checks
if not os.path.isdir(bootdir):
parser.error("%s is not a directory" % bootdir)
if os.getuid() > 0:
parser.error("need root permissions")
# do the thing!
if opt.disk:
efiboot = tempfile.NamedTemporaryFile(prefix="mkefiboot.").name
mkefiboot(bootdir, efiboot, opt.label)
mkefidisk(efiboot, outfile)
else:
mkefiboot(bootdir, outfile, opt.label)