qga: Replace 'blacklist' command line and config file options by 'block-rpcs'

Let's use a more appropriate wording for this command line and config
file option. The old ones are still accepted for compatibility reasons,
but marked as deprecated now so that it could be removed in a future
version of QEMU.

This change is based on earlier patches from Philippe Mathieu-Daudé,
with the idea for the new option name suggested by BALATON Zoltan.

And while we're at it, replace the "?" in the help text with "help"
since that does not have the problem of conflicting with the wildcard
character of the shells.

Message-Id: <20220727092135.302915-2-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

docs/about/deprecated.rst

@@ -370,3 +370,22 @@ be deleted from this tree.
 New deployments should use the Rust version, and existing systems
 should consider moving to it.  The command line and feature set
 is very close and moving should be simple.
+
+
+QEMU guest agent
+----------------
+
+``--blacklist`` command line option (since 7.2)
+'''''''''''''''''''''''''''''''''''''''''''''''
+
+``--blacklist`` has been replaced by ``--block-rpcs`` (which is a better
+wording for what this option does). The short form ``-b`` still stays
+the same and thus is the preferred way for scripts that should run with
+both, older and future versions of QEMU.
+
+``blacklist`` config file option (since 7.2)
+''''''''''''''''''''''''''''''''''''''''''''
+
+The ``blacklist`` config file option has been renamed to ``block-rpcs``
+(to be in sync with the renaming of the corresponding command line
+option).

docs/interop/qemu-ga.rst

@@ -79,10 +79,10 @@ Options
 
   Daemonize after startup (detach from terminal).
 
-.. option:: -b, --blacklist=LIST
+.. option:: -b, --block-rpcs=LIST
 
-  Comma-separated list of RPCs to disable (no spaces, ``?`` to list
-  available RPCs).
+  Comma-separated list of RPCs to disable (no spaces, use ``help`` to
+  list available RPCs).
 
 .. option:: -D, --dump-conf
 
@@ -125,7 +125,7 @@ pidfile        string
 fsfreeze-hook  string
 statedir       string
 verbose        boolean
-blacklist      string list
+block-rpcs     string list
 =============  ===========
 
 See also

qga/main.c

@@ -260,8 +260,8 @@ QEMU_COPYRIGHT "\n"
 #ifdef _WIN32
 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 #endif
-"  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
-"                    to list available RPCs)\n"
+"  -b, --block-rpcs  comma-separated list of RPCs to disable (no spaces,\n"
+"                    use \"help\" to list available RPCs)\n"
 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 "                    options / command-line parameters to stdout\n"
 "  -r, --retry-path  attempt re-opening path if it's unavailable or closed\n"
@@ -963,6 +963,7 @@ static void config_load(GAConfig *config)
     GError *gerr = NULL;
     GKeyFile *keyfile;
     g_autofree char *conf = g_strdup(g_getenv("QGA_CONF")) ?: get_relocated_path(QGA_CONF_DEFAULT);
+    const gchar *blockrpcs_key = "block-rpcs";
 
     /* read system config */
     keyfile = g_key_file_new();
@@ -1009,9 +1010,15 @@ static void config_load(GAConfig *config)
         config->retry_path =
             g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
     }
+
     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
+        g_warning("config using deprecated 'blacklist' key, should be replaced"
+                  " with the 'block-rpcs' key.");
+        blockrpcs_key = "blacklist";
+    }
+    if (g_key_file_has_key(keyfile, "general", blockrpcs_key, NULL)) {
         config->bliststr =
-            g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
+            g_key_file_get_string(keyfile, "general", blockrpcs_key, &gerr);
         config->blacklist = g_list_concat(config->blacklist,
                                           split_list(config->bliststr, ","));
     }
@@ -1073,7 +1080,7 @@ static void config_dump(GAConfig *config)
     g_key_file_set_boolean(keyfile, "general", "retry-path",
                            config->retry_path);
     tmp = list_join(config->blacklist, ',');
-    g_key_file_set_string(keyfile, "general", "blacklist", tmp);
+    g_key_file_set_string(keyfile, "general", "block-rpcs", tmp);
     g_free(tmp);
 
     tmp = g_key_file_to_data(keyfile, NULL, &error);
@@ -1105,7 +1112,8 @@ static void config_parse(GAConfig *config, int argc, char **argv)
         { "method", 1, NULL, 'm' },
         { "path", 1, NULL, 'p' },
         { "daemonize", 0, NULL, 'd' },
-        { "blacklist", 1, NULL, 'b' },
+        { "block-rpcs", 1, NULL, 'b' },
+        { "blacklist", 1, NULL, 'b' },  /* deprecated alias for 'block-rpcs' */
 #ifdef _WIN32
         { "service", 1, NULL, 's' },
 #endif

tests/data/test-qga-config

@@ -5,4 +5,4 @@ path=/path/to/org.qemu.guest_agent.0
 pidfile=/var/foo/qemu-ga.pid
 statedir=/var/state
 verbose=true
-blacklist=guest-ping;guest-get-time
+block-rpcs=guest-ping;guest-get-time

tests/unit/test-qga.c

@@ -729,7 +729,7 @@ static void test_qga_config(gconstpointer data)
     g_assert_true(g_key_file_get_boolean(kf, "general", "verbose", &error));
     g_assert_no_error(error);
 
-    strv = g_key_file_get_string_list(kf, "general", "blacklist", &n, &error);
+    strv = g_key_file_get_string_list(kf, "general", "block-rpcs", &n, &error);
     g_assert_cmpint(n, ==, 2);
     g_assert_true(g_strv_contains((const char * const *)strv,
                                   "guest-ping"));