Catch error if trying to load zero bytes resume file

bilby/bilby_mcmc/sampler.py

@@ -388,7 +388,9 @@ class Bilby_MCMC(MCMCSampler):
             If true, resume file was successfully loaded, otherwise false
 
         """
-        if os.path.isfile(self.resume_file) is False:
+        if os.path.isfile(self.resume_file) is False or not os.path.getsize(
+            self.resume_file
+        ):
             return False
         import dill
 

bilby/core/sampler/dynesty.py

@@ -736,7 +736,10 @@ class Dynesty(NestedSampler):
         if os.path.isfile(self.resume_file):
             logger.info(f"Reading resume file {self.resume_file}")
             with open(self.resume_file, "rb") as file:
-                sampler = dill.load(file)
+                try:
+                    sampler = dill.load(file)
+                except EOFError:
+                    sampler = None
 
                 if not hasattr(sampler, "versions"):
                     logger.warning(

bilby/core/sampler/emcee.py

@@ -311,7 +311,11 @@ class Emcee(MCMCSampler):
         """
         if hasattr(self, "_sampler"):
             pass
-        elif self.resume and os.path.isfile(self.checkpoint_info.sampler_file):
+        elif (
+            self.resume
+            and os.path.isfile(self.checkpoint_info.sampler_file)
+            and os.path.getsize(self.checkpoint_info.sampler_file)
+        ):
             import dill
 
             logger.info(

bilby/core/sampler/kombine.py

@@ -166,7 +166,11 @@ class Kombine(Emcee):
         return self.sampler.chain[:nsteps, :, :]
 
     def check_resume(self):
-        return self.resume and os.path.isfile(self.checkpoint_info.sampler_file)
+        return (
+            self.resume
+            and os.path.isfile(self.checkpoint_info.sampler_file)
+            and os.path.getsize(self.checkpoint_info.sampler_file) > 0
+        )
 
     @signal_wrapper
     def run_sampler(self):

bilby/core/sampler/ptemcee.py

@@ -415,7 +415,11 @@ class Ptemcee(MCMCSampler):
             # This is a very ugly hack to support numpy>=1.24
             ptemcee.sampler.np.float = float
 
-        if os.path.isfile(self.resume_file) and self.resume is True:
+        if (
+            os.path.isfile(self.resume_file)
+            and os.path.getsize(self.resume_file)
+            and self.resume is True
+        ):
             import dill
 
             logger.info(f"Resume data {self.resume_file} found")
@@ -513,7 +517,7 @@ class Ptemcee(MCMCSampler):
         logger.info("Starting to sample")
 
         while True:
-            for (pos0, log_posterior, log_likelihood) in sampler.sample(
+            for pos0, log_posterior, log_likelihood in sampler.sample(
                 self.pos0,
                 storechain=False,
                 iterations=self.convergence_inputs.niterations_per_check,