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bootloader/grub2: Don't do anything if we have static configs

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This builds on top of fa9924e4fe
(But in a very hacky way because we don't currently link to a JSON library)

Basically, bootupd supports injecting static configs, and this
is the currently least hacky way for us to detect this and understand
that we shouldn't try to run `grub2-mkconfig`.

A further patch I'd like to do here is also change the probing
logic to gracefully no-op if `grub2-mkconfig` doesn't exist,
but that has a bit more risk and involvement.
This commit is contained in:
Colin Walters 2024-02-27 13:14:16 -05:00
parent 1b3ffe54e8
commit e47b370963
2 changed files with 57 additions and 0 deletions
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21
src/libostree/ostree-bootloader-grub2.c
View File

@ -26,6 +26,11 @@
#include <string.h>
// Written by bootupd
#define BOOTUPD_CONFIG "boot/bootupd-state.json"
// Horrible hack, to avoid including a JSON parser we just grep for this
#define BOOTUPD_CONFIG_STATIC_JSON_FRAGMENT "\"static-configs\""
/* Maintain backwards compatibility with legacy GRUB
* installations that might rely on the -16 suffix
* for real-mode booting.
@ -75,6 +80,22 @@ _ostree_bootloader_grub2_query (OstreeBootloader *bootloader, gboolean *out_is_a
{
OstreeBootloaderGrub2 *self = OSTREE_BOOTLOADER_GRUB2 (bootloader);
g_autoptr (GFile) bootupd_config
= g_file_resolve_relative_path (self->sysroot->path, BOOTUPD_CONFIG);
if (g_file_query_exists (bootupd_config, NULL))
{
g_autofree char *bootupd_config_contents = NULL;
if (!g_file_load_contents (bootupd_config, cancellable, &bootupd_config_contents, NULL, NULL,
error))
return glnx_prefix_error (error, "Failed to read bootupd config");
if (strstr (bootupd_config_contents, BOOTUPD_CONFIG_STATIC_JSON_FRAGMENT) != NULL)
{
g_debug ("Found static bootupd config");
*out_is_active = FALSE;
return TRUE;
}
}
/* Look for the BIOS path first */
if (g_file_query_exists (self->config_path_bios_1, NULL)
|| g_file_query_exists (self->config_path_bios_2, NULL))

36
tests/kolainst/destructive/bootupd-static.sh Executable file
View File

@ -0,0 +1,36 @@
#!/bin/bash
set -xeuo pipefail
. ${KOLA_EXT_DATA}/libinsttest.sh
require_writable_sysroot
prepare_tmpdir
bootupd_state=/boot/bootupd-state.json
mount -o remount,rw /boot
if grep -qFe "\"static-configs\"" "${bootupd_state}"; then
echo "Host is using static configs already, overriding this"
jq 'del(.["static-configs"])' < "${bootupd_state}" > "${bootupd_state}".new
mv "${bootupd_state}.new" "${bootupd_state}"
fi
# Print the current value for reference, it's "none" on FCOS derivatives
ostree config get sysroot.bootloader || true
ostree config set sysroot.bootloader auto
ostree admin deploy --stage "${host_commit}"
systemctl stop ostree-finalize-staged.service
used_bootloader=$(journalctl -u ostree-finalize-staged -o json MESSAGE_ID=dd440e3e549083b63d0efc7dc15255f1 | tail -1 | jq -r .OSTREE_BOOTLOADER)
# We're verifying the legacy default now
assert_streq "${used_bootloader}" "grub2"
ostree admin undeploy 0
# Now synthesize a bootupd config which uses static configs
jq '. + {"static-configs": {}}' < "${bootupd_state}" > "${bootupd_state}".new
mv "${bootupd_state}.new" "${bootupd_state}"
ostree admin deploy --stage "${host_commit}"
systemctl stop ostree-finalize-staged.service
used_bootloader=$(journalctl -u ostree-finalize-staged -o json MESSAGE_ID=dd440e3e549083b63d0efc7dc15255f1 | tail -1 | jq -r .OSTREE_BOOTLOADER)
assert_streq "${used_bootloader}" "none"
echo "ok bootupd static"