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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jonathan Lebon <jonathan@jlebon.com>
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Date: Wed, 17 Aug 2022 10:26:03 -0400
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Subject: [PATCH] squish: BLS: only write /etc/kernel/cmdline if writable
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On OSTree systems, `grub2-mkconfig` is run with `/etc` mounted read-only
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because as part of the promise of transactional updates, we want to make
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sure that we're not modifying the current deployment's state (`/etc` or
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`/var`).
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This conflicts with 0837dcdf1 ("BLS: create /etc/kernel/cmdline during
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mkconfig") which wants to write to `/etc/kernel/cmdline`. I'm not
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exactly sure on the background there, but based on the comment I think
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the intent is to fulfill grubby's expectation that the file exists.
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However, in systems like Silverblue, kernel arguments are managed by the
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rpm-ostree stack and grubby is not shipped at all.
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Adjust the script slightly so that we only write `/etc/kernel/cmdline`
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if the parent directory is writable.
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In the future, we're hoping to simplify things further on rpm-ostree
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systems by not running `grub2-mkconfig` at all since libostree already
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directly writes BLS entries. Doing that would also have avoided this,
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but ratcheting it into existing systems needs more careful thought.
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Signed-off-by: Jonathan Lebon <jonathan@jlebon.com>
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Fixes: https://github.com/fedora-silverblue/issue-tracker/issues/322
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---
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util/grub.d/10_linux.in | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
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index 5d1fa072f2..4795a63b4c 100644
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--- a/util/grub.d/10_linux.in
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+++ b/util/grub.d/10_linux.in
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@@ -161,12 +161,13 @@ update_bls_cmdline()
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local cmdline="root=${LINUX_ROOT_DEVICE} ro ${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
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local -a files=($(get_sorted_bls))
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- if [[ ! -f /etc/kernel/cmdline ]] ||
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- [[ /etc/kernel/cmdline -ot /etc/default/grub ]]; then
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- # anaconda has the correct information to create this during install;
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- # afterward, grubby will take care of syncing on updates. If the user
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- # has modified /etc/default/grub, try to cope.
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- echo "$cmdline" > /etc/kernel/cmdline
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+ if [ -w /etc/kernel ] &&
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+ [[ ! -f /etc/kernel/cmdline ||
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+ /etc/kernel/cmdline -ot /etc/default/grub ]]; then
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+ # anaconda has the correct information to create this during install;
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+ # afterward, grubby will take care of syncing on updates. If the user
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+ # has modified /etc/default/grub, try to cope.
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+ echo "$cmdline" > /etc/kernel/cmdline
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fi
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for bls in "${files[@]}"; do
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