Public bug reported:
grub-mkconfig adds a "devicetree /boot/dtb" command even if /boot/dtb is
a directory, causing grub to complain at bootup with "Not a regular
file", which may prevent automatic bootup, as user interaction is needed
to acknowledge this warning.
/etc/grub.d/10_linux is responsible for detecting and adding the
command:
if test -n "${dtb}" ; then
if [ x"$quiet_boot" = x0 ] || [ x"$type" != xsimple ]; then
message="$(gettext_printf "Loading device tree blob...")"
sed "s/^/$submenu_indentation/" << EOF
echo '$(echo "$message" | grub_quote)'
EOF
fi
sed "s/^/$submenu_indentation/" << EOF
devicetree ${rel_dirname}/${dtb}
EOF
fi
[...]
dtb=
for i in "dtb-${version}" "dtb-${alt_version}" "dtb"; do
if test -e "${dirname}/${i}" ; then
dtb="$i"
break
fi
done
Since "dtb" exists in /boot, the dtb variable is not empty and the
command gets added. The test command is wrong, it catches directories,
so the command should be added only if the file exists (-e) AND if it's
not a directory (! -d). This piece of code comes from ubuntu-add-
devicetree-command-support.patch, see my patch for a potential fix.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: patch
** Patch added: "dtb_test.patch"
https://bugs.launchpad.net/bugs/2084071/+attachment/5826490/+files/dtb_test.patch
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https://bugs.launchpad.net/bugs/2084071
Title:
grub-mkconfig mistakingly adds a devicetree command when the dtb file
is actually a directory
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