tests/tpm: Display if swtpm is not found or --tpm2 not supported

If swtpm is not found in $PATH or --tpm2 isn't supported, we display
this in the test log. We cannot mark the test as skipped due to a bug in
certain versions of the gtester environment that interprets a skipped test
as failure.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>

tests/tpm-tests.c

@@ -18,6 +18,17 @@
 #include "libqtest.h"
 #include "tpm-tests.h"
 
+static bool
+tpm_test_swtpm_skip(void)
+{
+    if (!tpm_util_swtpm_has_tpm2()) {
+        fprintf(stderr, "swtpm not in PATH or missing --tpm2 support; ");
+        return true;
+    }
+
+    return false;
+}
+
 void tpm_test_swtpm_test(const char *src_tpm_path, tx_func *tx,
                          const char *ifmodel)
 {
@@ -28,12 +39,13 @@ void tpm_test_swtpm_test(const char *src_tpm_path, tx_func *tx,
     GPid swtpm_pid;
     GError *error = NULL;
 
-    succ = tpm_util_swtpm_start(src_tpm_path, &swtpm_pid, &addr, &error);
-    /* succ may be false if swtpm is not available */
-    if (!succ) {
+    if (tpm_test_swtpm_skip()) {
         return;
     }
 
+    succ = tpm_util_swtpm_start(src_tpm_path, &swtpm_pid, &addr, &error);
+    g_assert_true(succ);
+
     args = g_strdup_printf(
         "-chardev socket,id=chr,path=%s "
         "-tpmdev emulator,id=dev,chardev=chr "
@@ -74,19 +86,17 @@ void tpm_test_swtpm_migration_test(const char *src_tpm_path,
     GError *error = NULL;
     QTestState *src_qemu, *dst_qemu;
 
-    succ = tpm_util_swtpm_start(src_tpm_path, &src_tpm_pid,
-                                &src_tpm_addr, &error);
-    /* succ may be false if swtpm is not available */
-    if (!succ) {
+    if (tpm_test_swtpm_skip()) {
         return;
     }
 
+    succ = tpm_util_swtpm_start(src_tpm_path, &src_tpm_pid,
+                                &src_tpm_addr, &error);
+    g_assert_true(succ);
+
     succ = tpm_util_swtpm_start(dst_tpm_path, &dst_tpm_pid,
                                 &dst_tpm_addr, &error);
-    /* succ may be false if swtpm is not available */
-    if (!succ) {
-        goto err_src_tpm_kill;
-    }
+    g_assert_true(succ);
 
     tpm_util_migration_start_qemu(&src_qemu, &dst_qemu,
                                   src_tpm_addr, dst_tpm_addr, uri,
@@ -118,7 +128,6 @@ void tpm_test_swtpm_migration_test(const char *src_tpm_path,
         qapi_free_SocketAddress(dst_tpm_addr);
     }
 
-err_src_tpm_kill:
     tpm_util_swtpm_kill(src_tpm_pid);
     if (src_tpm_addr) {
         g_unlink(src_tpm_addr->u.q_unix.path);

tests/tpm-util.c

@@ -145,7 +145,7 @@ void tpm_util_pcrread(QTestState *s, tx_func *tx,
     g_assert_cmpmem(buffer, exp_resp_size, exp_resp, exp_resp_size);
 }
 
-static bool tpm_util_swtpm_has_tpm2(void)
+bool tpm_util_swtpm_has_tpm2(void)
 {
     bool has_tpm2 = false;
     char *out = NULL;
@@ -190,11 +190,6 @@ gboolean tpm_util_swtpm_start(const char *path, GPid *pid,
     gboolean succ;
     unsigned i;
 
-    succ = tpm_util_swtpm_has_tpm2();
-    if (!succ) {
-        goto cleanup;
-    }
-
     *addr = g_new0(SocketAddress, 1);
     (*addr)->type = SOCKET_ADDRESS_TYPE_UNIX;
     (*addr)->u.q_unix.path = g_build_filename(path, "sock", NULL);
@@ -202,7 +197,6 @@ gboolean tpm_util_swtpm_start(const char *path, GPid *pid,
     succ = g_spawn_async(NULL, swtpm_argv, NULL, G_SPAWN_SEARCH_PATH,
                          NULL, NULL, pid, error);
 
-cleanup:
     for (i = 0; swtpm_argv[i]; i++) {
         g_free(swtpm_argv[i]);
     }

tests/tpm-util.h

@@ -32,6 +32,8 @@ void tpm_util_pcrextend(QTestState *s, tx_func *tx);
 void tpm_util_pcrread(QTestState *s, tx_func *tx,
                       const unsigned char *exp_resp, size_t exp_resp_size);
 
+bool tpm_util_swtpm_has_tpm2(void);
+
 gboolean tpm_util_swtpm_start(const char *path, GPid *pid,
                               SocketAddress **addr, GError **error);
 void tpm_util_swtpm_kill(GPid pid);