tests/qtest: Move mkimg() and have_qemu_img() from libqos to libqtest

These two functions can be useful for other qtests beside the
qos-test, too, so move them to libqtest instead.

Message-Id: <20230704071655.75381-3-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/libqos/libqos.c

@@ -137,56 +137,9 @@ void migrate(QOSState *from, QOSState *to, const char *uri)
     migrate_allocator(&from->alloc, &to->alloc);
 }
 
-bool have_qemu_img(void)
-{
-    char *rpath;
-    const char *path = getenv("QTEST_QEMU_IMG");
-    if (!path) {
-        return false;
-    }
-
-    rpath = realpath(path, NULL);
-    if (!rpath) {
-        return false;
-    } else {
-        free(rpath);
-        return true;
-    }
-}
-
-void mkimg(const char *file, const char *fmt, unsigned size_mb)
-{
-    gchar *cli;
-    bool ret;
-    int rc;
-    GError *err = NULL;
-    char *qemu_img_path;
-    gchar *out, *out2;
-    char *qemu_img_abs_path;
-
-    qemu_img_path = getenv("QTEST_QEMU_IMG");
-    g_assert(qemu_img_path);
-    qemu_img_abs_path = realpath(qemu_img_path, NULL);
-    g_assert(qemu_img_abs_path);
-
-    cli = g_strdup_printf("%s create -f %s %s %uM", qemu_img_abs_path,
-                          fmt, file, size_mb);
-    ret = g_spawn_command_line_sync(cli, &out, &out2, &rc, &err);
-    if (err || !g_spawn_check_exit_status(rc, &err)) {
-        fprintf(stderr, "%s\n", err->message);
-        g_error_free(err);
-    }
-    g_assert(ret && !err);
-
-    g_free(out);
-    g_free(out2);
-    g_free(cli);
-    free(qemu_img_abs_path);
-}
-
 void mkqcow2(const char *file, unsigned size_mb)
 {
-    return mkimg(file, "qcow2", size_mb);
+    g_assert_true(mkimg(file, "qcow2", size_mb));
 }
 
 void prepare_blkdebug_script(const char *debug_fn, const char *event)

tests/qtest/libqos/libqos.h

@@ -27,8 +27,6 @@ QOSState *qtest_boot(QOSOps *ops, const char *cmdline_fmt, ...)
     G_GNUC_PRINTF(2, 3);
 void qtest_common_shutdown(QOSState *qs);
 void qtest_shutdown(QOSState *qs);
-bool have_qemu_img(void);
-void mkimg(const char *file, const char *fmt, unsigned size_mb);
 void mkqcow2(const char *file, unsigned size_mb);
 void migrate(QOSState *from, QOSState *to, const char *uri);
 void prepare_blkdebug_script(const char *debug_fn, const char *event);

tests/qtest/libqtest.c

@@ -1742,3 +1742,55 @@ bool qtest_qom_get_bool(QTestState *s, const char *path, const char *property)
 
     return b;
 }
+
+bool have_qemu_img(void)
+{
+    char *rpath;
+    const char *path = getenv("QTEST_QEMU_IMG");
+    if (!path) {
+        return false;
+    }
+
+    rpath = realpath(path, NULL);
+    if (!rpath) {
+        return false;
+    } else {
+        free(rpath);
+        return true;
+    }
+}
+
+bool mkimg(const char *file, const char *fmt, unsigned size_mb)
+{
+    gchar *cli;
+    bool ret;
+    int rc;
+    GError *err = NULL;
+    char *qemu_img_path;
+    gchar *out, *out2;
+    char *qemu_img_abs_path;
+
+    qemu_img_path = getenv("QTEST_QEMU_IMG");
+    if (!qemu_img_path) {
+        return false;
+    }
+    qemu_img_abs_path = realpath(qemu_img_path, NULL);
+    if (!qemu_img_abs_path) {
+        return false;
+    }
+
+    cli = g_strdup_printf("%s create -f %s %s %uM", qemu_img_abs_path,
+                          fmt, file, size_mb);
+    ret = g_spawn_command_line_sync(cli, &out, &out2, &rc, &err);
+    if (err || !g_spawn_check_exit_status(rc, &err)) {
+        fprintf(stderr, "%s\n", err->message);
+        g_error_free(err);
+    }
+
+    g_free(out);
+    g_free(out2);
+    g_free(cli);
+    free(qemu_img_abs_path);
+
+    return ret && !err;
+}

tests/qtest/libqtest.h

@@ -994,4 +994,24 @@ bool qtest_qom_get_bool(QTestState *s, const char *path, const char *property);
  */
 pid_t qtest_pid(QTestState *s);
 
+/**
+ * have_qemu_img:
+ *
+ * Returns: true if "qemu-img" is available.
+ */
+bool have_qemu_img(void);
+
+/**
+ * mkimg:
+ * @file: File name of the image that should be created
+ * @fmt: Format, e.g. "qcow2" or "raw"
+ * @size_mb: Size of the image in megabytes
+ *
+ * Create a disk image with qemu-img. Note that the QTEST_QEMU_IMG
+ * environment variable must point to the qemu-img file.
+ *
+ * Returns: true if the image has been created successfully.
+ */
+bool mkimg(const char *file, const char *fmt, unsigned size_mb);
+
 #endif