New flag to glusterfsd binary to print libexec dir

New CLI option for `glusterfsd` binary to get the path of
libexec directory. This helps glusterd2 to detect the
installed path of `gsyncd` and other binaries.

Usage: `glusterfsd --print-libexecdir`

Updates: bz#1193929
Change-Id: I8c1a74afd9acec7ee7bd3deabed9d9f20fe3fb5f
Signed-off-by: Aravinda VK <avishwan@redhat.com>

glusterfsd/src/Makefile.am

@@ -21,6 +21,7 @@ AM_CPPFLAGS = $(GF_CPPFLAGS) \
 	-I$(top_srcdir)/libglusterfs/src -DDATADIR=\"$(localstatedir)\" \
 	-DCONFDIR=\"$(sysconfdir)/glusterfs\" $(GF_GLUSTERFS_CFLAGS) \
 	-DXLATORDIR=\"$(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator\" \
+	-DLIBEXECDIR=\"$(GLUSTERFS_LIBEXECDIR)\"\
 	-I$(top_srcdir)/rpc/rpc-lib/src \
 	-I$(top_srcdir)/rpc/xdr/src \
 	-I$(top_builddir)/rpc/xdr/src \

glusterfsd/src/glusterfsd.c

@@ -173,6 +173,8 @@ static struct argp_option gf_options[] = {
          "Print directory path in which statedumps shall be generated"},
         {"print-logdir", ARGP_PRINT_LOGDIR_KEY, 0, OPTION_ARG_OPTIONAL,
          "Print path of default log directory"},
+        {"print-libexecdir", ARGP_PRINT_LIBEXECDIR_KEY, 0, OPTION_ARG_OPTIONAL,
+         "Print path of default libexec directory"},
 
         {"volfile-max-fetch-attempts", ARGP_VOLFILE_MAX_FETCH_ATTEMPTS, "0",
          OPTION_HIDDEN, "Maximum number of attempts to fetch the volfile"},
@@ -974,6 +976,10 @@ parse_opts (int key, char *arg, struct argp_state *state)
                 cmd_args->print_logdir = _gf_true;
                 break;
 
+        case ARGP_PRINT_LIBEXECDIR_KEY:
+                cmd_args->print_libexecdir = _gf_true;
+                break;
+
         case ARGP_MAC_COMPAT_KEY:
                 if (!arg)
                         arg = "on";
@@ -2076,7 +2082,7 @@ parse_cmdline (int argc, char *argv[], glusterfs_ctx_t *ctx)
         argp_parse (&argp, argc, argv, ARGP_IN_ORDER, NULL, cmd_args);
 
         if (cmd_args->print_xlatordir || cmd_args->print_statedumpdir ||
-            cmd_args->print_logdir) {
+            cmd_args->print_logdir || cmd_args->print_libexecdir) {
                 /* Just print, nothing else to do */
                 goto out;
         }
@@ -2694,6 +2700,11 @@ main (int argc, char *argv[])
                 goto out;
         }
 
+        if (cmd->print_libexecdir) {
+                printf ("%s\n", LIBEXECDIR);
+                goto out;
+        }
+
         if (cmd->print_netgroups) {
                 /* If this option is set we want to print & verify the file,
                  * set the return value (exit code in this case) and exit.

glusterfsd/src/glusterfsd.h

@@ -107,6 +107,7 @@ enum argp_option_keys {
         ARGP_PRINT_LOGDIR_KEY             = 185,
         ARGP_KERNEL_WRITEBACK_CACHE_KEY   = 186,
         ARGP_ATTR_TIMES_GRANULARITY_KEY   = 187,
+        ARGP_PRINT_LIBEXECDIR_KEY         = 188,
 };
 
 struct _gfd_vol_top_priv {

libglusterfs/src/glusterfs.h

@@ -483,6 +483,7 @@ struct _cmd_args {
         int                print_xlatordir;
         int                print_statedumpdir;
         int                print_logdir;
+        int                print_libexecdir;
         /* advanced options */
         uint32_t           volfile_server_port;
         char              *volfile_server_transport;

tests/basic/glusterfsd-args.t

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+
+EXPECT $GLUSTER_LIBEXECDIR glusterfsd --print-libexecdir

tests/env.rc.in

@@ -34,3 +34,6 @@ export PYTHONPATH
 
 GLUSTER_CMD_DIR=@sbindir@
 export GLUSTER_CMD_DIR
+
+GLUSTER_LIBEXECDIR=@GLUSTERFS_LIBEXECDIR@
+export GLUSTER_LIBEXECDIR