unikernel/duniverse/dune_/test/blackbox-tests/test-cases/digest-cache/stats-used-in-db.t

@@ -0,0 +1,16 @@
+Reproduction case for a bug we discovered in the past; Dune was
+storing the wrong stats for generated files in the digest cache and as
+a result was always re-hashing all files in the build directory on the
+second run.
+
+More precisely, we were using the stats of the file before making it
+read-only.
+
+
+  $ echo '(lang dune 3.0)' > dune-project
+  $ touch x y z
+  $ dune build x y z --wait-for-filesystem-clock
+
+Check that the next build rehashes nothing:
+
+  $ dune build x y z --wait-for-filesystem-clock --debug-digests 2>&1 | sed 's/stats = { .*\( perm = [0-9]*\).*}/stats = {\1; ... }/'