unikernel/duniverse/dune_/test/blackbox-tests/test-cases/depend-on/dep-on-alias.t

@@ -0,0 +1,83 @@
+
+  $ mkdir a
+  $ cd a
+
+  $ cat >dune-project <<EOF
+  > (lang dune 3.0)
+  > (expand_aliases_in_sandbox)
+  > EOF
+  $ echo old-contents > x
+  $ cat >dune <<EOF
+  > (alias
+  >  (name a)
+  >  (deps x))
+  > (rule
+  >  (alias b)
+  >  (deps (alias a))
+  >  (action (system "printf \"running b: \"; cat x")))
+  > (rule
+  >  (deps (alias a))
+  >  (action
+  >   (progn
+  >    (system "printf \"running b: \"; cat x")
+  >    (with-stdout-to b (system "cat x")))))
+  > EOF
+  $ dune build @b
+  running b: old-contents
+  $ dune build @b
+  $ echo new-contents > x
+  $ dune build @b
+  running b: new-contents
+^ dune does re-run the action when a dependency declared 
+via an alias changes.
+And the path does appear in the sandbox:
+  $ dune build @b --sandbox copy 2>&1 | grep -v 'cd _build/.sandbox'
+  running b: new-contents
+
+However, this is only since 3.0, before that aliases where not
+expanded when creating the sandbox:
+
+  $ echo '(lang dune 2.8)' > dune-project
+  $ dune clean
+  $ dune build @b --sandbox copy 2>&1 | grep -v 'cd _build/.sandbox'
+  File "dune", lines 4-7, characters 0-86:
+  4 | (rule
+  5 |  (alias b)
+  6 |  (deps (alias a))
+  7 |  (action (system "printf \"running b: \"; cat x")))
+  running b: cat: x: No such file or directory
+  $ cat >dune-project <<EOF
+  > (lang dune 3.0)
+  > (expand_aliases_in_sandbox)
+  > EOF
+
+Now test that including an alias into another alias includes its expansion:
+  $ cat >dune <<EOF
+  > (alias
+  >  (name a0)
+  >  (deps x))
+  > (alias
+  >  (name a)
+  >  (deps (alias a0)))
+  > (rule
+  >  (alias b)
+  >  (deps (alias a))
+  >  (action (system "printf \"running b: \"; cat x")))
+  > (rule
+  >  (deps (alias a))
+  >  (action
+  >   (progn
+  >    (system "printf \"running b: \"; cat x")
+  >    (with-stdout-to b (system "cat x")))))
+  > EOF
+  $ rm -r _build
+  $ echo old-contents > x
+  $ dune build @b
+  running b: old-contents
+  $ dune build @b
+  $ echo new-contents > x
+  $ dune build @b
+  running b: new-contents
+The path still does appear in the sandbox:
+  $ dune build @b --sandbox copy 2>&1 | grep -v 'cd _build/.sandbox'
+  running b: new-contents