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tpm: Improve help on TPM types when none are available 

Help is a bit awkward when no TPM types are built into QEMU:

    $ qemu-system-x86_64 -tpmdev nonexistent,id=tpm0
    qemu-system-x86_64: -tpmdev nonexistent,id=tpm0: Parameter 'type' expects a TPM backend type
    Supported TPM types (choose only one):

Improve to

    qemu-system-x86_64: -tpmdev nonexistent,id=tpm0: Parameter 'type' expects a TPM backend type
    No TPM backend types are available

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Markus Armbruster 2020-07-23 13:58:45 +02:00 committed by Stefan Berger
parent d64072c0ac
commit 5a6791c3d4
1 changed files with 9 additions and 4 deletions
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13
tpm.c
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@ -47,18 +47,23 @@ tpm_be_find_by_type(enum TpmType type)
*/
static void tpm_display_backend_drivers(void)
{
bool got_one = false;
int i;
fprintf(stderr, "Supported TPM types (choose only one):\n");
for (i = 0; i < TPM_TYPE__MAX; i++) {
const TPMBackendClass *bc = tpm_be_find_by_type(i);
if (!bc) {
continue;
}
fprintf(stderr, "%12s %s\n", TpmType_str(i), bc->desc);
if (!got_one) {
error_printf("Supported TPM types (choose only one):\n");
got_one = true;
}
error_printf("%12s %s\n", TpmType_str(i), bc->desc);
}
if (!got_one) {
error_printf("No TPM backend types are available\n");
}
fprintf(stderr, "\n");
}
/*