Delete rocksdb dir after crashtest

Summary:
We should clean up after ourselves. Last crashtest failed because the disk on the cibuild machine was full.

Also, db_crashtest is supposed to run the test on the same database in every iteration. This isn't the case currently, because every run creates a new tmp directory. It's fixed with this diff.

Test Plan: ran it

Reviewers: ljin

Reviewed By: ljin

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17073

Author: igorcanadi

tools/db_crashtest.py

@@ -8,9 +8,10 @@
 import logging
 import tempfile
 import subprocess
+import shutil
 
 # This script runs and kills db_stress multiple times. It checks consistency
-# in case of unsafe crashes in Rocksdb.
+# in case of unsafe crashes in RocksDB.
 
 def main(argv):
     try:
@@ -59,6 +60,8 @@ def main(argv):
           + str(ops_per_thread) + "\nwrite_buffer_size="
           + str(write_buf_size) + "\n")
 
+    dbname = tempfile.mkdtemp(prefix='rocksdb_crashtest_')
+
     while time.time() < exit_time:
         run_had_errors = False
         killtime = time.time() + interval
@@ -98,7 +101,7 @@ def main(argv):
             """ % (ops_per_thread,
                    threads,
                    write_buf_size,
-                   tempfile.mkdtemp(),
+                   dbname,
                    random.randint(0, 1),
                    random.randint(0, 1),
                    random.randint(0, 1)))
@@ -139,5 +142,8 @@ def main(argv):
 
         time.sleep(1)  # time to stabilize before the next run
 
+    # we need to clean up after ourselves -- only do this on test success
+    shutil.rmtree(dbname, True)
+
 if __name__ == "__main__":
     sys.exit(main(sys.argv[1:]))

tools/db_crashtest2.py

@@ -8,6 +8,7 @@
 import logging
 import tempfile
 import subprocess
+import shutil
 
 # This python script runs db_stress multiple times. Some runs with
 # kill_random_test that causes rocksdb to crash at various points in code.
@@ -78,6 +79,7 @@ def main(argv):
             # nomral run
             additional_opts = "--ops_per_thread=" + str(ops_per_thread)
 
+        dbname = tempfile.mkdtemp(prefix='rocksdb_crashtest_')
         cmd = re.sub('\s+', ' ', """
             ./db_stress
             --test_batches_snapshots=%s
@@ -113,7 +115,7 @@ def main(argv):
             """ % (random.randint(0, 1),
                    threads,
                    write_buf_size,
-                   tempfile.mkdtemp(),
+                   dbname,
                    random.randint(0, 1),
                    random.randint(0, 1),
                    random.randint(0, 1),
@@ -154,6 +156,8 @@ def main(argv):
         if (stdoutdata.find('fail') >= 0):
             print "TEST FAILED. Output has 'fail'!!!\n"
             sys.exit(2)
+        # we need to clean up after ourselves -- only do this on test success
+        shutil.rmtree(dbname, True)
 
         check_mode = (check_mode + 1) % total_check_mode