[RFC PATCH 01/18] qemu-storage-daemon: Add barebone tool

[Kevin Wolf <kwolf@redhat.com>]

This adds a new binary qemu-storage-daemon that doesn't yet do more than
some typical initialisation for tools and parsing the basic command
options --version, --help and --trace.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 configure             |   2 +-
 qemu-storage-daemon.c | 141 ++++++++++++++++++++++++++++++++++++++++++
 Makefile              |   1 +
 3 files changed, 143 insertions(+), 1 deletion(-)
 create mode 100644 qemu-storage-daemon.c

diff --git a/configure b/configure
index 08ca4bcb46..bb3d55fb25 100755
--- a/configure
+++ b/configure
@@ -6034,7 +6034,7 @@ tools=""
 if test "$want_tools" = "yes" ; then
   tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) qemu-edid\$(EXESUF) $tools"
   if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
-    tools="qemu-nbd\$(EXESUF) $tools"
+    tools="qemu-nbd\$(EXESUF) qemu-storage-daemon\$(EXESUF) $tools"
   fi
   if [ "$ivshmem" = "yes" ]; then
     tools="ivshmem-client\$(EXESUF) ivshmem-server\$(EXESUF) $tools"
diff --git a/qemu-storage-daemon.c b/qemu-storage-daemon.c
new file mode 100644
index 0000000000..a251dc255c
--- /dev/null
+++ b/qemu-storage-daemon.c
@@ -0,0 +1,141 @@
+/*
+ * QEMU storage daemon
+ *
+ * Copyright (c) 2019 Kevin Wolf <kwolf@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+
+#include "block/block.h"
+#include "crypto/init.h"
+
+#include "qapi/error.h"
+#include "qemu-common.h"
+#include "qemu-version.h"
+#include "qemu/config-file.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+
+#include "trace/control.h"
+
+#include <getopt.h>
+
+static void help(void)
+{
+    printf(
+"Usage: %s [options]\n"
+"QEMU storage daemon\n"
+"\n"
+"  -h, --help             display this help and exit\n"
+"  -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
+"                         specify tracing options\n"
+"  -V, --version          output version information and exit\n"
+"\n"
+QEMU_HELP_BOTTOM "\n",
+    error_get_progname());
+}
+
+static int process_options(int argc, char *argv[], Error **errp)
+{
+    int c;
+    char *trace_file = NULL;
+    int ret = -EINVAL;
+
+    static const struct option long_options[] = {
+        {"help", no_argument, 0, 'h'},
+        {"version", no_argument, 0, 'V'},
+        {"trace", required_argument, NULL, 'T'},
+        {0, 0, 0, 0}
+    };
+
+    while ((c = getopt_long(argc, argv, ":hT:V", long_options, NULL)) != -1) {
+        switch (c) {
+        case '?':
+            error_setg(errp, "Unknown option '%s'", argv[optind - 1]);
+            goto out;
+        case ':':
+            error_setg(errp, "Missing option argument for '%s'",
+                       argv[optind - 1]);
+            goto out;
+        case 'h':
+            help();
+            exit(EXIT_SUCCESS);
+        case 'V':
+            printf("qemu-storage-daemon version "
+                   QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n");
+            exit(EXIT_SUCCESS);
+        case 'T':
+            g_free(trace_file);
+            trace_file = trace_opt_parse(optarg);
+            break;
+        }
+    }
+    if (optind != argc) {
+        error_setg(errp, "Unexpected argument: %s", argv[optind]);
+        goto out;
+    }
+
+    if (!trace_init_backends()) {
+        error_setg(errp, "Could not initialize trace backends");
+        goto out;
+    }
+    trace_init_file(trace_file);
+    qemu_set_log(LOG_TRACE);
+
+    ret = 0;
+out:
+    g_free(trace_file);
+    return ret;
+}
+
+int main(int argc, char *argv[])
+{
+    Error *local_err = NULL;
+    int ret;
+
+#ifdef CONFIG_POSIX
+    signal(SIGPIPE, SIG_IGN);
+#endif
+
+    error_init(argv[0]);
+    qemu_init_exec_dir(argv[0]);
+
+    module_call_init(MODULE_INIT_QOM);
+    module_call_init(MODULE_INIT_TRACE);
+    qemu_add_opts(&qemu_trace_opts);
+    qcrypto_init(&error_fatal);
+    bdrv_init();
+
+    if (qemu_init_main_loop(&local_err)) {
+        error_report_err(local_err);
+        return EXIT_FAILURE;
+    }
+
+    ret = process_options(argc, argv, &local_err);
+    if (ret < 0) {
+        error_report_err(local_err);
+        return EXIT_FAILURE;
+    }
+
+    return EXIT_SUCCESS;
+}
diff --git a/Makefile b/Makefile
index 30f0abfb42..76338d0ab4 100644
--- a/Makefile
+++ b/Makefile
@@ -558,6 +558,7 @@ qemu-img.o: qemu-img-cmds.h
 qemu-img$(EXESUF): qemu-img.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
 qemu-nbd$(EXESUF): qemu-nbd.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
 qemu-io$(EXESUF): qemu-io.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
+qemu-storage-daemon$(EXESUF): qemu-storage-daemon.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
 
 qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o $(COMMON_LDADDS)
 
-- 
2.20.1