Colin Walters
d546abfa2a
In this approach, we drop a /etc/grub.d/15_ostree file which is a hybrid of shell/C that picks up bits from the GRUB2 library (e.g. the block device script generation), and then calls into libostree's GRUB2 code which knows about the BLS entries. This is admittedly ugly. There exists another approach for GRUB2 to learn the BLS specification. However, the spec has a few issues: https://www.redhat.com/archives/anaconda-devel-list/2014-July/msg00002.html This approach also gives a bit more control to the admin via the naming of the 15_ostree symlink; they can easily disable it: Or reorder the ostree entries ahead of 10_linux: Also, this approach doesn't require patches for grub2, which is an issue with the pressure to backport (rpm-)OSTree to EL7.
48 lines
1.6 KiB
Bash
48 lines
1.6 KiB
Bash
#!/bin/sh
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#
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# Copyright (C) 2014 Colin Walters <walters@verbum.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation; either version 2 of the licence or (at
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# your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General
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# Public License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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# Boston, MA 02111-1307, USA.
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# Gracefully exit if ostree is not installed
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if ! which ostree >/dev/null 2>/dev/null; then
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exit 0
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fi
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# Make sure we're in the right environment
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if ! test -n "${GRUB_DEVICE}"; then
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echo "This script must be run as a child of grub2-mkconfig" 1>&2
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exit 1
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fi
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set -e
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# Pick up stuff from grub's helper that we want to inject into our
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# generated bootloader configuration. Yes, this is pretty awful, but
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# it's a lot better than reimplementing the config-generating bits of
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# OSTree in shell script.
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. /usr/share/grub/grub-mkconfig_lib
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DEVICE=${GRUB_DEVICE_BOOT:-${GRUB_DEVICE}}
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GRUB2_BOOT_DEVICE_ID="$(grub_get_device_id ${DEVICE})"
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export GRUB2_BOOT_DEVICE_ID
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GRUB2_PREPARE_ROOT_CACHE="$(prepare_grub_to_access_device ${DEVICE})"
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export GRUB2_PREPARE_ROOT_CACHE
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exec ostree admin instutil grub2-generate
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