efi_loader: reduce noisiness if ESP is missing

EFI variables can be stored in a file on the EFI system partition. If that
partition is missing we are writing two error messages per variable. This
is too noisy.

Just warn once about the missing ESP.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

diff --git a/lib/efi_loader/efi_var_file.c b/lib/efi_loader/efi_var_file.c
index 413e179..ba0bf33 100644 (file)
--- a/lib/efi_loader/efi_var_file.c
+++ b/lib/efi_loader/efi_var_file.c
@@ -37,18 +37,16 @@ static efi_status_t __maybe_unused efi_set_blk_dev_to_system_partition(void)
        char part_str[PART_STR_LEN];
        int r;
 
-       if (efi_system_partition.uclass_id == UCLASS_INVALID) {
-               log_err("No EFI system partition\n");
+       if (efi_system_partition.uclass_id == UCLASS_INVALID)
                return EFI_DEVICE_ERROR;
-       }
+
        snprintf(part_str, PART_STR_LEN, "%x:%x",
                 efi_system_partition.devnum, efi_system_partition.part);
        r = fs_set_blk_dev(blk_get_uclass_name(efi_system_partition.uclass_id),
                           part_str, FS_TYPE_ANY);
-       if (r) {
-               log_err("Cannot read EFI system partition\n");
+       if (r)
                return EFI_DEVICE_ERROR;
-       }
+
        return EFI_SUCCESS;
 }
 
@@ -67,14 +65,21 @@ efi_status_t efi_var_to_file(void)
        loff_t len;
        loff_t actlen;
        int r;
+       static bool once;
 
        ret = efi_var_collect(&buf, &len, EFI_VARIABLE_NON_VOLATILE);
        if (ret != EFI_SUCCESS)
                goto error;
 
        ret = efi_set_blk_dev_to_system_partition();
-       if (ret != EFI_SUCCESS)
-               goto error;
+       if (ret != EFI_SUCCESS) {
+               if (!once) {
+                       log_warning("Cannot persist EFI variables without system partition\n");
+                       once = true;
+               }
+               goto out;
+       }
+       once = false;
 
        r = fs_write(EFI_VAR_FILE_NAME, map_to_sysmem(buf), 0, len, &actlen);
        if (r || len != actlen)
@@ -83,6 +88,7 @@ efi_status_t efi_var_to_file(void)
 error:
        if (ret != EFI_SUCCESS)
                log_err("Failed to persist EFI variables\n");
+out:
        free(buf);
        return ret;
 #else