[PATCH v2 08/11] tests/9pfs: introduce local tests

[Christian Schoenebeck]

This patch introduces 9pfs test cases using the 9pfs 'local'
filesystem driver which reads/writes/creates/deletes real files
and directories.

In this initial version, there is only one local test which actually
only checks if the 9pfs 'local' device was created successfully.

Before the 9pfs 'local' tests are run, a test directory 'qtest-9p-local'
is created (with world rwx permissions) under the current working
directory. At this point that test directory is not auto deleted yet.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 tests/qtest/libqos/virtio-9p.c | 100 +++++++++++++++++++++++++++++++++
 tests/qtest/libqos/virtio-9p.h |   5 ++
 tests/qtest/virtio-9p-test.c   |  44 ++++++++++-----
 3 files changed, 135 insertions(+), 14 deletions(-)

diff --git a/tests/qtest/libqos/virtio-9p.c b/tests/qtest/libqos/virtio-9p.c
index 2e300063e3..86e40e5d56 100644
--- a/tests/qtest/libqos/virtio-9p.c
+++ b/tests/qtest/libqos/virtio-9p.c
@@ -24,6 +24,63 @@
 #include "qgraph.h"
 
 static QGuestAllocator *alloc;
+static char *local_test_path;
+
+static char *strpr(const char* format, ...) GCC_FMT_ATTR(1, 2);
+
+/* Concatenates the passed 2 pathes. Returned result must be freed. */
+static char *concat_path(const char* a, const char* b)
+{
+    const int len = strlen(a) + strlen("/") + strlen(b);
+    char *path = g_malloc0(len + 1);
+    snprintf(path, len + 1, "%s/%s", a, b);
+    g_assert(strlen(path) == len);
+    return path;
+}
+
+/*
+ * Lazy sprintf() implementation which auto allocates buffer. Returned result
+ * must be freed.
+ */
+static char *strpr(const char* format, ...)
+{
+    va_list argp;
+
+    va_start(argp, format);
+    const int sz = vsnprintf(NULL, 0, format, argp) + 1;
+    va_end(argp);
+
+    g_assert(sz > 0);
+    char *s = g_malloc0(sz);
+
+    va_start(argp, format);
+    const int len = vsnprintf(s, sz, format, argp);
+    va_end(argp);
+
+    g_assert(len + 1 == sz);
+    return s;
+}
+
+static void init_local_test_path(void)
+{
+    char *pwd = get_current_dir_name();
+    local_test_path = concat_path(pwd, "qtest-9p-local");
+    free(pwd);
+}
+
+/* Creates the directory for the 9pfs 'local' filesystem driver to access. */
+static void create_local_test_dir(void)
+{
+    struct stat st;
+
+    g_assert(local_test_path != NULL);
+    mkdir(local_test_path, 0777);
+
+    /* ensure test directory exists now ... */
+    g_assert(stat(local_test_path, &st) == 0);
+    /* ... and is actually a directory */
+    g_assert((st.st_mode & S_IFMT) == S_IFDIR);
+}
 
 static void virtio_9p_cleanup(QVirtio9P *interface)
 {
@@ -146,11 +203,54 @@ static void *virtio_9p_pci_create(void *pci_bus, 
QGuestAllocator *t_alloc,
     return obj;
 }
 
+void virtio_9p_assign_local_driver(GString *cmd_line, const char *args)
+{
+    GRegex *regex;
+    char *s, *arg_repl;
+
+    g_assert_nonnull(local_test_path);
+
+    /* replace 'synth' driver by 'local' driver */
+    regex = g_regex_new("-fsdev synth,", 0, 0, NULL);
+    s = g_regex_replace_literal(
+        regex, cmd_line->str, -1, 0, "-fsdev local,", 0, NULL
+    );
+    g_string_assign(cmd_line, s);
+    g_free(s);
+    g_regex_unref(regex);
+
+    /* add 'path=...' to '-fsdev ...' group */
+    regex = g_regex_new("(-fsdev \\w+)(\\s*)", 0, 0, NULL);
+    arg_repl = strpr("\\1\\2,path='%s'", local_test_path);
+    s = g_regex_replace(
+        regex, cmd_line->str, -1, 0, arg_repl, 0, NULL
+    );
+    g_string_assign(cmd_line, s);
+    g_free(arg_repl);
+    g_free(s);
+    g_regex_unref(regex);
+
+    /* add passed args to '-fsdev ...' group */
+    regex = g_regex_new("(-fsdev \\w+)(\\s*)", 0, 0, NULL);
+    arg_repl = strpr("\\1\\2,%s", args);
+    s = g_regex_replace(
+        regex, cmd_line->str, -1, 0, arg_repl, 0, NULL
+    );
+    g_string_assign(cmd_line, s);
+    g_free(arg_repl);
+    g_free(s);
+    g_regex_unref(regex);
+}
+
 static void virtio_9p_register_nodes(void)
 {
     const char *str_simple = "fsdev=fsdev0,mount_tag=" MOUNT_TAG;
     const char *str_addr = "fsdev=fsdev0,addr=04.0,mount_tag=" MOUNT_TAG;
 
+    /* make sure test dir for the 'local' tests exists and is clean */
+    init_local_test_path();
+    create_local_test_dir();
+
     QPCIAddress addr = {
         .devfn = QPCI_DEVFN(4, 0),
     };
diff --git a/tests/qtest/libqos/virtio-9p.h b/tests/qtest/libqos/virtio-9p.h
index b1e6badc4a..326a603f72 100644
--- a/tests/qtest/libqos/virtio-9p.h
+++ b/tests/qtest/libqos/virtio-9p.h
@@ -44,4 +44,9 @@ struct QVirtio9PDevice {
     QVirtio9P v9p;
 };
 
+/**
+ * Prepares QEMU command line for 9pfs tests using the 'local' fs driver.
+ */
+void virtio_9p_assign_local_driver(GString *cmd_line, const char *args);
+
 #endif
diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
index 3281153b9c..af7e169d3a 100644
--- a/tests/qtest/virtio-9p-test.c
+++ b/tests/qtest/virtio-9p-test.c
@@ -895,29 +895,45 @@ static void fs_readdir_split_512(void *obj, void *data,
     fs_readdir_split(obj, data, t_alloc, 512);
 }
 
+static void *assign_9p_local_driver(GString *cmd_line, void *arg)
+{
+    virtio_9p_assign_local_driver(cmd_line, "security_model=mapped-xattr");
+    return arg;
+}
+
 static void register_virtio_9p_test(void)
 {
-    qos_add_test("synth/config", "virtio-9p", pci_config, NULL);
-    qos_add_test("synth/version/basic", "virtio-9p", fs_version, NULL);
-    qos_add_test("synth/attach/basic", "virtio-9p", fs_attach, NULL);
-    qos_add_test("synth/walk/basic", "virtio-9p", fs_walk, NULL);
+
+    QOSGraphTestOptions opts = {
+    };
+
+    /* 9pfs test cases using the 'synth' filesystem driver */
+    qos_add_test("synth/config", "virtio-9p", pci_config, &opts);
+    qos_add_test("synth/version/basic", "virtio-9p", fs_version,  &opts);
+    qos_add_test("synth/attach/basic", "virtio-9p", fs_attach,  &opts);
+    qos_add_test("synth/walk/basic", "virtio-9p", fs_walk,  &opts);
     qos_add_test("synth/walk/no_slash", "virtio-9p", fs_walk_no_slash,
-                 NULL);
+                  &opts);
     qos_add_test("synth/walk/dotdot_from_root", "virtio-9p",
-                 fs_walk_dotdot, NULL);
-    qos_add_test("synth/lopen/basic", "virtio-9p", fs_lopen, NULL);
-    qos_add_test("synth/write/basic", "virtio-9p", fs_write, NULL);
+                 fs_walk_dotdot,  &opts);
+    qos_add_test("synth/lopen/basic", "virtio-9p", fs_lopen,  &opts);
+    qos_add_test("synth/write/basic", "virtio-9p", fs_write,  &opts);
     qos_add_test("synth/flush/success", "virtio-9p", fs_flush_success,
-                 NULL);
+                  &opts);
     qos_add_test("synth/flush/ignored", "virtio-9p", fs_flush_ignored,
-                 NULL);
-    qos_add_test("synth/readdir/basic", "virtio-9p", fs_readdir, NULL);
+                  &opts);
+    qos_add_test("synth/readdir/basic", "virtio-9p", fs_readdir,  &opts);
     qos_add_test("synth/readdir/split_512", "virtio-9p",
-                 fs_readdir_split_512, NULL);
+                 fs_readdir_split_512,  &opts);
     qos_add_test("synth/readdir/split_256", "virtio-9p",
-                 fs_readdir_split_256, NULL);
+                 fs_readdir_split_256,  &opts);
     qos_add_test("synth/readdir/split_128", "virtio-9p",
-                 fs_readdir_split_128, NULL);
+                 fs_readdir_split_128,  &opts);
+
+
+    /* 9pfs test cases using the 'local' filesystem driver */
+    opts.before = assign_9p_local_driver;
+    qos_add_test("local/config", "virtio-9p", pci_config,  &opts);
 }
 
 libqos_init(register_virtio_9p_test);
-- 
2.20.1