Command metadata regenerate

[lttng-tools.git] / src / bin / lttng / commands / metadata.c

diff --git a/src/bin/lttng/commands/metadata.c b/src/bin/lttng/commands/metadata.c
new file mode 100644 (file)
index 0000000..20c577e
--- /dev/null
+++ b/src/bin/lttng/commands/metadata.c
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2015 - Julien Desfossez <jdesfossez@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _LGPL_SOURCE
+#include <assert.h>
+#include <ctype.h>
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <common/mi-lttng.h>
+
+#include "../command.h"
+
+static char *opt_session_name;
+static char *session_name = NULL;
+
+static int metadata_regenerate(int argc, const char **argv);
+
+enum {
+       OPT_HELP = 1,
+       OPT_LIST_OPTIONS,
+       OPT_LIST_COMMANDS,
+};
+
+static struct poptOption long_options[] = {
+       /* { longName, shortName, argInfo, argPtr, value, descrip, argDesc, } */
+       { "help",               'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0, },
+       { "session",            's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
+       { "list-options",       0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, 0, 0, },
+       { "list-commands",      0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS},
+       { 0, 0, 0, 0, 0, 0, 0, },
+};
+
+static struct cmd_struct actions[] = {
+       { "regenerate", metadata_regenerate },
+       { NULL, NULL }  /* Array closure */
+};
+
+/*
+ * usage
+ */
+static void usage(FILE *ofp)
+{
+       fprintf(ofp, "usage: lttng metadata [OPTION] ACTION\n");
+       fprintf(ofp, "\n");
+       fprintf(ofp, "Actions:\n");
+       fprintf(ofp, "   regenerate\n");
+       fprintf(ofp, "      Regenerate and overwrite the metadata of the session.\n");
+       fprintf(ofp, "Options:\n");
+       fprintf(ofp, "  -h, --help               Show this help.\n");
+       fprintf(ofp, "      --list-options       Simple listing of options.\n");
+       fprintf(ofp, "  -s, --session NAME       Apply to session name.\n");
+       fprintf(ofp, "\n");
+}
+
+/*
+ * Count and return the number of arguments in argv.
+ */
+static int count_arguments(const char **argv)
+{
+       int i = 0;
+
+       assert(argv);
+
+       while (argv[i] != NULL) {
+               i++;
+       }
+
+       return i;
+}
+
+static int metadata_regenerate(int argc, const char **argv)
+{
+       int ret;
+
+       ret = lttng_metadata_regenerate(session_name);
+       if (ret == 0) {
+               MSG("Metadata successfully regenerated for session %s", session_name);
+       }
+       return ret;
+}
+
+static int handle_command(const char **argv)
+{
+       struct cmd_struct *cmd;
+       int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS;
+
+       if (argv == NULL) {
+               usage(stderr);
+               command_ret = CMD_ERROR;
+               goto end;
+       }
+
+       argc = count_arguments(argv);
+
+       cmd = &actions[i];
+       while (cmd->func != NULL) {
+               /* Find command */
+               if (strcmp(argv[0], cmd->name) == 0) {
+                       command_ret = cmd->func(argc, argv);
+                       goto end;
+               }
+
+               cmd = &actions[i++];
+       }
+
+       ret = CMD_UNDEFINED;
+
+end:
+       /* Overwrite ret if an error occurred in cmd->func() */
+       ret = command_ret ? command_ret : ret;
+       return ret;
+}
+
+/*
+ * Metadata command handling.
+ */
+int cmd_metadata(int argc, const char **argv)
+{
+       int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS;
+       static poptContext pc;
+
+       if (argc < 1) {
+               usage(stderr);
+               ret = CMD_ERROR;
+               goto end;
+       }
+
+       pc = poptGetContext(NULL, argc, argv, long_options, 0);
+       poptReadDefaultConfig(pc, 0);
+
+       while ((opt = poptGetNextOpt(pc)) != -1) {
+               switch (opt) {
+               case OPT_HELP:
+                       usage(stdout);
+                       goto end;
+               case OPT_LIST_OPTIONS:
+                       list_cmd_options(stdout, long_options);
+                       goto end;
+               case OPT_LIST_COMMANDS:
+                       list_commands(actions, stdout);
+                       goto end;
+               default:
+                       usage(stderr);
+                       ret = CMD_UNDEFINED;
+                       goto end;
+               }
+       }
+
+       if (!opt_session_name) {
+               session_name = get_session_name();
+               if (session_name == NULL) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+       } else {
+               session_name = opt_session_name;
+       }
+
+       command_ret = handle_command(poptGetArgs(pc));
+       if (command_ret) {
+               switch (-command_ret) {
+               default:
+                       ERR("%s", lttng_strerror(command_ret));
+                       break;
+               }
+       }
+
+end:
+       if (!opt_session_name) {
+               free(session_name);
+       }
+
+       /* Overwrite ret if an error occurred during handle_command() */
+       ret = command_ret ? command_ret : ret;
+
+       poptFreeContext(pc);
+       return ret;
+}