CORTX-32172: Fixes ADDB client logs to bundled it in rgw support bund…

…le (Seagate#2059)

Problem:
The addb client logs in rgw container is generating in wrong directory (rgw_debug). 
This "rgw_debug" directories meant for rgw crash files only. Our expectation, addb 
client logs should be resides in "addb_files-0x7200000000000001:0x13" directory.

Solution:
It's required to set an environment for M0_CLIENT_ADDB_DIR on cortx-rgw-integration 
repository in src/rgw/setup/rgw.py at config stage.

In cortx-motr, client_init.c will make use of M0_CLIENT_ADDB_DIR environment variable 
to store addb client log.

Signed-off-by: Rahul Kumar <rahul.kumar@seagate.com>

motr/client_init.c

@@ -27,6 +27,7 @@
 #include "lib/arith.h"                /* M0_CNT_INC */
 #include "lib/mutex.h"                /* m0_mutex_lock */
 #include "lib/time.h"                 /* m0_nanosleep */
+#include "lib/string.h"               /* getenv() */
 #include "addb2/global.h"
 #include "addb2/sys.h"
 #include "fid/fid.h"                  /* m0_fid */
@@ -1528,7 +1529,6 @@ M0_INTERNAL int m0_client_global_init(void)
 }
 
 #define NOT_EMPTY(x) (x != NULL && *x != '\0')
-
 static struct m0 m0_client_motr_instance;
 int m0_client_init(struct m0_client **m0c_p,
 		   struct m0_config *conf, bool init_m0)
@@ -1678,16 +1678,37 @@ int m0_client_init(struct m0_client **m0c_p,
 	}
 
 	if (conf->mc_is_addb_init) {
-		char buf[64];
+		char        buf[256];
+		/* uint64 max character size */
+		enum { MAX_PID_IN_CHAR_SIZE = 20 };
+		const char *addb_stob_location = NULL;
 		/* Default client addb record file size set to 128M */
 		m0_bcount_t size = DEFAULT_CLIENT_ADDB2_RECORD_SIZE;
+
 		if (conf->mc_addb_size != 0) {
 			if (conf->mc_addb_size > MAX_ADDB2_RECORD_SIZE)
 				M0_LOG(M0_WARN, "ADDB size is more than recommended");
 			size = conf->mc_addb_size;
 			M0_LOG(M0_DEBUG, "ADDB size = %" PRIu64 "", size);
 		}
-		sprintf(buf, "linuxstob:./addb_%d", (int)m0_pid());
+#ifndef __KERNEL__
+		addb_stob_location = getenv("M0_CLIENT_ADDB_DIR");
+#endif
+		/* checking for buf size overflow */
+		if (addb_stob_location != NULL && sizeof(&addb_stob_location) >=
+		   sizeof(buf) - (sizeof("linuxstob:/addb_") +
+		   MAX_PID_IN_CHAR_SIZE))
+		{
+			M0_LOG(M0_WARN, "ADDB location is more than defined "
+			                "size .. ignoring it.");
+			addb_stob_location = NULL;
+		}
+		if (addb_stob_location == NULL)
+			addb_stob_location = ".";
+
+		snprintf(buf, 255, "linuxstob:%s/addb_%d",
+		         addb_stob_location, (int)m0_pid());
+		M0_LOG(M0_DEBUG, "addb_files directory=%s\n", addb_stob_location);
 		M0_LOG(M0_DEBUG, "addb size=%llu\n", (unsigned long long)size);
 		rc = m0_reqh_addb2_init(&m0c->m0c_reqh, buf,
 					0xaddbf11e, true, true, size);