copy samplesfile to merlin_info (#259)

* copy samplesfile to merlin_info * added to CHANGELOG
LLNL · Jul 28, 2020 · 5af5354 · 5af5354
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to Merlin will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+- When using the `--samplesfile` flag, the samples file is now copied to `merlin_info` for
+  provenance.
+
 ## [1.7.0]
 
 ### Added

diff --git a/merlin/study/study.py b/merlin/study/study.py
@@ -397,6 +397,13 @@ def expanded_spec(self):
             env = result.get_study_environment()
             result.globals = self.load_pgen(self.pgen_file, self.pargs, env)
 
+        # copy the --samplesfile (if any) into merlin_info
+        if self.samples_file:
+            shutil.copyfile(
+                self.samples_file,
+                os.path.join(self.info, os.path.basename(self.samples_file)),
+            )
+
         # write expanded spec for provenance
         with open(expanded_filepath, "w") as f:
             f.write(result.dump())