MB-7930: delete all but 10 last erl_crash.dump-s

Change-Id: Iab52965c8a04a41f4d661529d434191aaa2cde8a
Reviewed-on: http://review.couchbase.org/27682
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>

couchbase-server.sh.in

@@ -34,7 +34,7 @@ couch_start_arguments=""
 LD_LIBRARY_PATH="@PREFIX@/lib":"@PREFIX@/lib/memcached":$LD_LIBRARY_PATH
 export LD_LIBRARY_PATH
 
-ERL_CRASH_DUMP=erl_crash.dump.$(date +%m-%d-%Y-%H:%M:%S).$$
+ERL_CRASH_DUMP=erl_crash.dump.$(date +%s).$$
 export ERL_CRASH_DUMP
 
 ERL_FULLSWEEP_AFTER=512
@@ -103,12 +103,20 @@ _load_config () {
     fi
 }
 
+_drop_old_crashdumps () {
+    ls -1 erl_crash.dump.* | sort | head -n -10 | xargs -- rm -f
+}
+
+
 _start() {
     _check_nofile
     _prepare_datadir
     _maybe_start_epmd
     _load_config
 
+    # note: we depend on pwd being $datadir from _prepare_datadir
+    _drop_old_crashdumps
+
     # Set an ENV variable to force C++ STL and string classes to not use its
     # default memory pooling allocator.
     # For GCC 3.2.2 and later