unikernel/duniverse/dune_/test/blackbox-tests/test-cases/dune-cache/missing-cache-entries.t

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+Check that Dune cache can cope with missing file/metadata entries.
+
+  $ export DUNE_CACHE_ROOT=$PWD/.cache
+
+  $ cat > config <<EOF
+  > (lang dune 2.1)
+  > (sandboxing_preference none)
+  > (cache enabled)
+  > (cache-duplication copy)
+  > (cache-transport direct)
+  > EOF
+  $ cat > dune-project <<EOF
+  > (lang dune 2.1)
+  > EOF
+  $ cat > dune <<EOF
+  > (rule
+  >   (deps source)
+  >   (targets target)
+  >   (action (bash "cat source source > target")))
+  > (rule
+  >   (deps source)
+  >   (targets twin-a twin-b)
+  >   (action (bash "echo twin-a-contents >> twin-a; echo twin-b-contents >> twin-b")))
+  > EOF
+  $ cat > source <<EOF
+  > \_o< COIN
+  > EOF
+
+  $ dune build --config-file=config target twin-a twin-b
+  $ cat _build/default/target
+  \_o< COIN
+  \_o< COIN
+  $ cat _build/default/twin-a _build/default/twin-b
+  twin-a-contents
+  twin-b-contents
+
+Delete the [files/v4] storage and test that Dune can cope with this.
+
+  $ rm -rf _build "$DUNE_CACHE_ROOT"/files/v4/
+  $ dune build --config-file=config target
+  $ cat _build/default/target
+  \_o< COIN
+  \_o< COIN
+
+Same but for the [meta/v5] storage.
+
+  $ rm -rf _build "$DUNE_CACHE_ROOT"/meta/v5/
+  $ dune build --config-file=config target
+  $ cat _build/default/target
+  \_o< COIN
+  \_o< COIN
+
+Now nuke the whole cache directory.
+
+  $ rm -rf "$DUNE_CACHE_ROOT"
+  $ rm -rf _build
+  $ dune build --config-file=config target twin-a twin-b
+  $ cat _build/default/target
+  \_o< COIN
+  \_o< COIN
+
+Selectively delete just one of the set of targets.
+
+  $ twin_b_entry=$(dune_cmd find-file-by-contents-regexp "$DUNE_CACHE_ROOT" "twin-b-contents")
+  $ rm "$twin_b_entry"
+  $ rm -r _build
+
+  $ dune build --config-file=config twin-a
+  $ cat _build/default/twin-a
+  twin-a-contents
+  $ cat _build/default/twin-b
+  twin-b-contents