tpm2-util: allow to control if legend and/or footer shown by tpm2_list_devices()

src/shared/tpm2-util.c

@@ -6165,7 +6165,7 @@ int tpm2_unseal_data(
 }
 #endif /* HAVE_TPM2 */
 
-int tpm2_list_devices(void) {
+int tpm2_list_devices(bool legend, bool quiet) {
 #if HAVE_TPM2
         _cleanup_(table_unrefp) Table *t = NULL;
         _cleanup_closedir_ DIR *d = NULL;
@@ -6179,6 +6179,8 @@ int tpm2_list_devices(void) {
         if (!t)
                 return log_oom();
 
+        (void) table_set_header(t, legend);
+
         d = opendir("/sys/class/tpmrm");
         if (!d) {
                 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open /sys/class/tpmrm: %m");
@@ -6224,7 +6226,7 @@ int tpm2_list_devices(void) {
                 }
         }
 
-        if (table_isempty(t)) {
+        if (table_isempty(t) && !quiet) {
                 log_info("No suitable TPM2 devices found.");
                 return 0;
         }

src/shared/tpm2-util.h

@@ -385,7 +385,7 @@ static inline int tpm2_pcrlock_search_file(const char *path, FILE **ret_file, ch
 
 #endif /* HAVE_TPM2 */
 
-int tpm2_list_devices(void);
+int tpm2_list_devices(bool legend, bool quiet);
 int tpm2_find_device_auto(char **ret);
 
 int tpm2_make_pcr_json_array(uint32_t pcr_mask, sd_json_variant **ret);