static gboolean
_ostree_bootloader_grub2_write_config (OstreeBootloader *bootloader,
int bootversion,
GCancellable *cancellable,
GError **error)
{
OstreeBootloaderGrub2 *self = OSTREE_BOOTLOADER_GRUB2 (bootloader);
gboolean ret = FALSE;
gs_unref_object GFile *efi_new_config_temp = NULL;
gs_unref_object GFile *efi_orig_config = NULL;
gs_unref_object GFile *new_config_path = NULL;
gs_unref_object GSSubprocessContext *procctx = NULL;
gs_unref_object GSSubprocess *proc = NULL;
gs_strfreev char **child_env = g_get_environ ();
gs_free char *bootversion_str = g_strdup_printf ("%u", (guint)bootversion);
gs_unref_object GFile *config_path_efi_dir = NULL;
if (self->is_efi)
{
config_path_efi_dir = g_file_get_parent (self->config_path_efi);
new_config_path = g_file_get_child (config_path_efi_dir, "grub.cfg.new");
/* We use grub2-mkconfig to write to a temporary file first */
if (!ot_gfile_ensure_unlinked (new_config_path, cancellable, error))
goto out;
}
else
{
new_config_path = ot_gfile_resolve_path_printf (self->sysroot->path, "boot/loader.%d/grub.cfg",
bootversion);
}
procctx = gs_subprocess_context_newv ("grub2-mkconfig", "-o",
gs_file_get_path_cached (new_config_path),
NULL);
child_env = g_environ_setenv (child_env, "_OSTREE_GRUB2_BOOTVERSION", bootversion_str, TRUE);
/* We have to pass our state to the child */
if (self->is_efi)
child_env = g_environ_setenv (child_env, "_OSTREE_GRUB2_IS_EFI", "1", TRUE);
gs_subprocess_context_set_environment (procctx, child_env);
gs_subprocess_context_set_stdout_disposition (procctx, GS_SUBPROCESS_STREAM_DISPOSITION_NULL);
if (g_getenv ("OSTREE_DEBUG_GRUB2"))
gs_subprocess_context_set_stderr_disposition (procctx, GS_SUBPROCESS_STREAM_DISPOSITION_INHERIT);
else
gs_subprocess_context_set_stderr_disposition (procctx, GS_SUBPROCESS_STREAM_DISPOSITION_NULL);
/* In the current Fedora grub2 package, this script doesn't even try
to be atomic; it just does:
cat ${grub_cfg}.new > ${grub_cfg}
rm -f ${grub_cfg}.new
Upstream is fixed though.
*/
proc = gs_subprocess_new (procctx, cancellable, error);
if (!proc)
goto out;
if (!gs_subprocess_wait_sync_check (proc, cancellable, error))
goto out;
/* Now let's fdatasync() for the new file */
if (!gs_file_sync_data (new_config_path, cancellable, error))
goto out;
if (self->is_efi)
{
gs_unref_object GFile *config_path_efi_old = g_file_get_child (config_path_efi_dir, "grub.cfg.old");
/* copy current to old */
if (!ot_gfile_ensure_unlinked (config_path_efi_old, cancellable, error))
goto out;
if (!g_file_copy (self->config_path_efi, config_path_efi_old,
G_FILE_COPY_OVERWRITE, cancellable, NULL, NULL, error))
goto out;
if (!ot_gfile_ensure_unlinked (config_path_efi_old, cancellable, error))
goto out;
/* NOTE: NON-ATOMIC REPLACEMENT; WE can't do anything else on FAT;
* see https://bugzilla.gnome.org/show_bug.cgi?id=724246
*/
if (!ot_gfile_ensure_unlinked (self->config_path_efi, cancellable, error))
goto out;
if (!gs_file_rename (new_config_path, self->config_path_efi,
cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
linkcopy_internal_attempt (GFile *src,
GFile *dest,
GFile *dest_parent,
GFileCopyFlags flags,
gboolean sync_data,
gboolean enable_guestfs_fuse_workaround,
gboolean *out_try_again,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
int res;
char *tmp_name = NULL;
GFile *tmp_dest = NULL;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
goto out;
tmp_name = gs_fileutil_gen_tmp_name (NULL, NULL);
tmp_dest = g_file_get_child (dest_parent, tmp_name);
res = link (gs_file_get_path_cached (src), gs_file_get_path_cached (tmp_dest));
if (res == -1)
{
if (errno == EEXIST)
{
/* Nothing, fall through */
*out_try_again = TRUE;
ret = TRUE;
goto out;
}
else if (errno == EXDEV || errno == EMLINK || errno == EPERM
|| (enable_guestfs_fuse_workaround && errno == ENOENT))
{
if (!g_file_copy (src, tmp_dest, flags,
cancellable, NULL, NULL, error))
goto out;
}
else
{
gs_set_prefix_error_from_errno (error, errno, "link");
goto out;
}
}
if (sync_data)
{
/* Now, we need to fsync */
if (!gs_file_sync_data (tmp_dest, cancellable, error))
goto out;
}
if (!gs_file_rename (tmp_dest, dest, cancellable, error))
goto out;
ret = TRUE;
*out_try_again = FALSE;
out:
g_clear_pointer (&tmp_name, g_free);
g_clear_object (&tmp_dest);
return ret;
}
