@@ -716,6 +716,7 @@ TEST_BUILTINS_OBJS += test-dump-split-index.o
TEST_BUILTINS_OBJS += test-dump-untracked-cache.o
TEST_BUILTINS_OBJS += test-example-decorate.o
TEST_BUILTINS_OBJS += test-fast-rebase.o
+TEST_BUILTINS_OBJS += test-fsmonitor-client.o
TEST_BUILTINS_OBJS += test-genrandom.o
TEST_BUILTINS_OBJS += test-genzeros.o
TEST_BUILTINS_OBJS += test-getcwd.o
new file mode 100644
@@ -0,0 +1,121 @@
+/*
+ * test-fsmonitor-client.c: client code to send commands/requests to
+ * a `git fsmonitor--daemon` daemon.
+ */
+
+#include "test-tool.h"
+#include "cache.h"
+#include "parse-options.h"
+#include "fsmonitor-ipc.h"
+
+#ifndef HAVE_FSMONITOR_DAEMON_BACKEND
+int cmd__fsmonitor_client(int argc, const char **argv)
+{
+ die("fsmonitor--daemon not available on this platform");
+}
+#else
+
+/*
+ * Read the `.git/index` to get the last token written to the
+ * FSMonitor Index Extension.
+ */
+static const char *get_token_from_index(void)
+{
+ struct index_state *istate = the_repository->index;
+
+ if (do_read_index(istate, the_repository->index_file, 0) < 0)
+ die("unable to read index file");
+ if (!istate->fsmonitor_last_update)
+ die("index file does not have fsmonitor extension");
+
+ return istate->fsmonitor_last_update;
+}
+
+/*
+ * Send an IPC query to a `git-fsmonitor--daemon` daemon and
+ * ask for the changes since the given token or from the last
+ * token in the index extension.
+ *
+ * This will implicitly start a daemon process if necessary. The
+ * daemon process will persist after we exit.
+ */
+static int do_send_query(const char *token)
+{
+ struct strbuf answer = STRBUF_INIT;
+ int ret;
+
+ if (!token || !*token)
+ token = get_token_from_index();
+
+ ret = fsmonitor_ipc__send_query(token, &answer);
+ if (ret < 0)
+ die(_("could not query fsmonitor--daemon"));
+
+ write_in_full(1, answer.buf, answer.len);
+ strbuf_release(&answer);
+
+ return 0;
+}
+
+/*
+ * Send a "flush" command to the `git-fsmonitor--daemon` (if running)
+ * and tell it to flush its cache.
+ *
+ * This feature is primarily used by the test suite to simulate a loss of
+ * sync with the filesystem where we miss kernel events.
+ */
+static int do_send_flush(void)
+{
+ struct strbuf answer = STRBUF_INIT;
+ int ret;
+
+ ret = fsmonitor_ipc__send_command("flush", &answer);
+ if (ret)
+ return ret;
+
+ write_in_full(1, answer.buf, answer.len);
+ strbuf_release(&answer);
+
+ return 0;
+}
+
+int cmd__fsmonitor_client(int argc, const char **argv)
+{
+ const char *subcmd;
+ const char *token = NULL;
+
+ const char * const fsmonitor_client_usage[] = {
+ N_("test-helper fsmonitor-client query [<token>]"),
+ N_("test-helper fsmonitor-client flush"),
+ NULL,
+ };
+
+ struct option options[] = {
+ OPT_STRING(0, "token", &token, N_("token"),
+ N_("command token to send to the server")),
+ OPT_END()
+ };
+
+ if (argc < 2)
+ usage_with_options(fsmonitor_client_usage, options);
+
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage_with_options(fsmonitor_client_usage, options);
+
+ subcmd = argv[1];
+ argv--;
+ argc++;
+
+ argc = parse_options(argc, argv, NULL, options, fsmonitor_client_usage, 0);
+
+ setup_git_directory();
+
+ if (!strcmp(subcmd, "query"))
+ return !!do_send_query(token);
+
+ if (!strcmp(subcmd, "flush"))
+ return !!do_send_flush();
+
+ die("Unhandled subcommand: '%s'", subcmd);
+}
+#endif
@@ -32,6 +32,7 @@ static struct test_cmd cmds[] = {
{ "dump-untracked-cache", cmd__dump_untracked_cache },
{ "example-decorate", cmd__example_decorate },
{ "fast-rebase", cmd__fast_rebase },
+ { "fsmonitor-client", cmd__fsmonitor_client },
{ "genrandom", cmd__genrandom },
{ "genzeros", cmd__genzeros },
{ "getcwd", cmd__getcwd },
@@ -23,6 +23,7 @@ int cmd__dump_untracked_cache(int argc, const char **argv);
int cmd__dump_reftable(int argc, const char **argv);
int cmd__example_decorate(int argc, const char **argv);
int cmd__fast_rebase(int argc, const char **argv);
+int cmd__fsmonitor_client(int argc, const char **argv);
int cmd__genrandom(int argc, const char **argv);
int cmd__genzeros(int argc, const char **argv);
int cmd__getcwd(int argc, const char **argv);