Integration tests for internal libraries.

This are currently failing because there are bugs which need to be
fixed.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Cabal/Distribution/Simple/Register.hs

@@ -88,7 +88,10 @@ register pkg lbi regFlags =
     -- usefully (they're not public.)  If we start supporting scoped
     -- packages, we'll have to relax this.
     when (hasPublicLib pkg) $
-        withLib pkg (registerOne pkg lbi regFlags)
+        let maybeRegister (CLib lib) _clbi =
+                registerOne pkg lbi regFlags lib
+            maybeRegister _comp _clbi = return ()
+        in withAllComponentsInBuildOrder pkg lbi maybeRegister
 
 registerOne :: PackageDescription -> LocalBuildInfo -> RegisterFlags
             -> Library

cabal-install/cabal-install.cabal

@@ -64,6 +64,15 @@ Extra-Source-Files:
   tests/IntegrationTests/freeze/should_run/freezes_transitive_dependencies.sh
   tests/IntegrationTests/freeze/should_run/my.cabal
   tests/IntegrationTests/freeze/should_run/runs_without_error.sh
+  tests/IntegrationTests/internal-libs/common.sh
+  tests/IntegrationTests/internal-libs/should_run/internal_lib_basic.sh
+  tests/IntegrationTests/internal-libs/should_run/internal_lib_shadow.sh
+  tests/IntegrationTests/internal-libs/should_run/p/Foo.hs
+  tests/IntegrationTests/internal-libs/should_run/p/p.cabal
+  tests/IntegrationTests/internal-libs/should_run/p/p/P.hs
+  tests/IntegrationTests/internal-libs/should_run/p/q/Q.hs
+  tests/IntegrationTests/internal-libs/should_run/q/Q.hs
+  tests/IntegrationTests/internal-libs/should_run/q/q.cabal
   tests/IntegrationTests/manpage/common.sh
   tests/IntegrationTests/manpage/should_run/outputs_manpage.sh
   tests/IntegrationTests/multiple-source/common.sh

cabal-install/tests/IntegrationTests/internal-libs/common.sh

+cabal() {
+    "$CABAL" $CABAL_ARGS "$@"
+}
+
+die() {
+    echo "die: $@"
+    exit 1
+}

cabal-install/tests/IntegrationTests/internal-libs/should_run/internal_lib_basic.sh

+. ../common.sh
+
+cabal sandbox init
+cabal sandbox add-source p
+cabal install p

cabal-install/tests/IntegrationTests/internal-libs/should_run/internal_lib_shadow.sh

+. ../common.sh
+
+cabal sandbox init
+cabal sandbox add-source p
+cabal sandbox add-source q
+cabal install p

cabal-install/tests/IntegrationTests/internal-libs/should_run/p/Foo.hs

+import Q
+main = putStrLn q

cabal-install/tests/IntegrationTests/internal-libs/should_run/p/p.cabal

+name:                p
+version:             0.1.0.0
+license:             BSD3
+author:              Edward Z. Yang
+maintainer:          ezyang@cs.stanford.edu
+build-type:          Simple
+cabal-version:       >=1.23
+
+library q
+  build-depends:       base
+  exposed-modules:     Q
+  hs-source-dirs:      q
+  default-language:    Haskell2010
+
+library
+  build-depends:       base, q
+  exposed-modules:     P
+  hs-source-dirs:      p
+  default-language:    Haskell2010
+
+executable foo
+  build-depends:       base, q
+  main-is:             Foo.hs

cabal-install/tests/IntegrationTests/internal-libs/should_run/p/p/P.hs

+module P where
+import Q

cabal-install/tests/IntegrationTests/internal-libs/should_run/p/q/Q.hs

+module Q where
+q = "I AM THE ONE"

cabal-install/tests/IntegrationTests/internal-libs/should_run/q/Q.hs

+module Q where
+q = "DO NOT SEE ME"

cabal-install/tests/IntegrationTests/internal-libs/should_run/q/q.cabal

+name:                q
+version:             0.1.0.0
+license:             BSD3
+author:              Edward Z. Yang
+maintainer:          ezyang@cs.stanford.edu
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Q
+  build-depends:       base
+  default-language:    Haskell2010