DAOS-16585 tests: Fix NLT handling of __fxstat detection

Use strace to determine whether calls to __fxstat actually happen
when using a utility/command the IL is being tested on, and stop
treating it as an error to not see __fxstat when it's not used.

Signed-off-by: Nicholas Murphy <ncmurphy@google.com>
Required-githooks: true

utils/node_local_test.py

@@ -1521,8 +1521,8 @@ def il_cmd(self, cmd, check_read=True, check_write=True, check_fstat=True):
  print(f'Logged il to {log_name}')
  print(ret)
 
- if self.caching:
- check_fstat = False
+ check_fstat = check_fstat and not self.caching and \
+ look_for_library_call(self.conf, cmd, '__fxstat')
 
  try:
  log_test(self.conf, log_name, check_read=check_read, check_write=check_write,
@@ -6327,6 +6327,23 @@ def server_fi(args):
  server.set_fi(probability=0)
 
 
+def look_for_library_call(conf, cmd, library_str):
+ """Look for library_str in the strace call stack of running cmd."""
+ tmpfile = tempfile.NamedTemporaryFile(mode='r',
+ prefix='dnt_assess_',
+ suffix='.strace',
+ dir=conf.tmp_dir)
+ strace_cmd = ['strace', '--stack-traces', '-v', '-o', tmpfile.name] + cmd
+ subprocess.run(strace_cmd, check=True)
+ lines = tmpfile.readlines()
+ tmpfile.close()
+ for line in lines:
+ if re.search(library_str, line):
+ return True
+
+ return False
+
+
 def run(wf, args):
  """Main entry point"""
  # pylint: disable=too-many-branches

utils/scripts/install-el8.sh

@@ -60,6 +60,7 @@ dnf --nodocs install \
  python3-devel \
  python3-pip \
  sg3_utils \
+ strace \
  sudo \
  systemd \
  valgrind-devel \

utils/scripts/install-el9.sh

@@ -59,6 +59,7 @@ dnf --nodocs install \
  python3-devel \
  python3-pip \
  sg3_utils \
+ strace \
  sudo \
  valgrind-devel \
  which \

utils/scripts/install-leap15.sh

@@ -57,6 +57,7 @@ dnf --nodocs install \
  python3-devel \
  scons \
  sg3_utils \
+ strace \
  sudo \
  valgrind-devel \
  which \

utils/scripts/install-ubuntu.sh

@@ -52,6 +52,7 @@ apt-get install \
  pkg-config \
  python3-dev \
  python3-venv \
+ strace \
  uuid-dev \
  valgrind \
  yasm