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-rw-r--r--lib/spack/spack/database.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/spack/spack/database.py b/lib/spack/spack/database.py
index 38bb7541e0..f941346bb1 100644
--- a/lib/spack/spack/database.py
+++ b/lib/spack/spack/database.py
@@ -311,7 +311,11 @@ class Database(object):
for spec in directory_layout.all_specs():
# Create a spec for each known package and add it.
path = directory_layout.path_for_spec(spec)
- self._add(spec, path, directory_layout)
+ old_info = old_data.get(spec.dag_hash())
+ explicit = False
+ if old_info is not None:
+ explicit = old_info.explicit
+ self._add(spec, path, directory_layout, explicit=explicit)
self._check_ref_counts()