Switch Travis builds to use cabal-install 2.0

- cabal-install 2.0 new-build has different directory
  layout; everything is adjusted for that.
- Using hvr's PPA for Linux builds, and a custom
  ezyang build for OS X

.travis.yml

@@ -105,7 +105,7 @@ before_install:
  - export PATH=$HOME/bin:$PATH
  - export PATH=$HOME/.cabal/bin:$PATH
  - export PATH=$HOME/.local/bin:$PATH
- - export PATH=/opt/cabal/1.24/bin:$PATH
+ - export PATH=/opt/cabal/2.0/bin:$PATH
  - export PATH=/opt/happy/1.19.5/bin:$PATH
  - export PATH=/opt/alex/3.1.7/bin:$PATH
  - if [ "$USE_GOLD" = "YES" ]; then sudo update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.gold" 20; fi

travis-common.sh

@@ -3,13 +3,19 @@ set -e
 HACKAGE_REPO_TOOL_VERSION="0.1.1"
 CABAL_VERSION="2.1.0.0"
 
+if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+    ARCH="x86_64-linux"
+else
+    ARCH="x86_64-osx"
+fi
+
 CABAL_STORE_DB="${HOME}/.cabal/store/ghc-${GHCVER}/package.db"
 CABAL_LOCAL_DB="${TRAVIS_BUILD_DIR}/dist-newstyle/packagedb/ghc-${GHCVER}"
-CABAL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/Cabal-${CABAL_VERSION}"
-CABAL_TESTSUITE_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/cabal-testsuite-${CABAL_VERSION}"
-CABAL_INSTALL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/cabal-install-${CABAL_VERSION}"
+CABAL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/$ARCH/ghc-$GHCVER/Cabal-${CABAL_VERSION}"
+CABAL_TESTSUITE_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/$ARCH/ghc-$GHCVER/cabal-testsuite-${CABAL_VERSION}"
+CABAL_INSTALL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/$ARCH/ghc-$GHCVER/cabal-install-${CABAL_VERSION}"
 CABAL_INSTALL_SETUP="${CABAL_INSTALL_BDIR}/setup/setup"
-HACKAGE_REPO_TOOL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/hackage-repo-tool-${HACKAGE_REPO_TOOL_VERSION}"
+HACKAGE_REPO_TOOL_BDIR="${TRAVIS_BUILD_DIR}/dist-newstyle/build/$ARCH/ghc-$GHCVER/hackage-repo-tool-${HACKAGE_REPO_TOOL_VERSION}/c/hackage-repo-tool"
 
 # ---------------------------------------------------------------------
 # Timing / diagnostic output

travis-install.sh

@@ -13,7 +13,7 @@ if [ -z ${STACKAGE_RESOLVER+x} ]; then
     if [ "$TRAVIS_OS_NAME" = "linux" ]; then
         travis_retry sudo add-apt-repository -y ppa:hvr/ghc
         travis_retry sudo apt-get update
-        travis_retry sudo apt-get install --force-yes cabal-install-1.24 happy-1.19.5 alex-3.1.7 ghc-$GHCVER-prof ghc-$GHCVER-dyn
+        travis_retry sudo apt-get install --force-yes cabal-install-2.0 happy-1.19.5 alex-3.1.7 ghc-$GHCVER-prof ghc-$GHCVER-dyn
         if [ "x$TEST_OTHER_VERSIONS" = "xYES" ]; then travis_retry sudo apt-get install --force-yes ghc-7.0.4-prof ghc-7.0.4-dyn ghc-7.2.2-prof ghc-7.2.2-dyn ghc-head-prof ghc-head-dyn; fi
 
     elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
@@ -59,10 +59,9 @@ if [ -z ${STACKAGE_RESOLVER+x} ]; then
         make install;
         cd ..;
 
-        travis_retry curl -L https://www.haskell.org/cabal/release/cabal-install-1.24.0.2/cabal-install-1.24.0.2-x86_64-apple-darwin-yosemite.tar.gz -o cabal-install.tar.gz
-        TAR=$PWD/cabal-install.tar.gz
         mkdir "${HOME}/bin"
-        (cd "${HOME}/bin" && tar -xzf "$TAR")
+        travis_retry curl -L http://web.mit.edu/~ezyang/Public/cabal-install-2.0.0.0-osx.gz | gunzip -c > "${HOME}/bin/cabal"
+        chmod a+x "${HOME}/bin/cabal"
         "${HOME}/bin/cabal" --version
 
     else

travis/upload.sh

@@ -70,10 +70,10 @@ cp $TRAVIS_BUILD_DIR/travis/id_rsa .
 cp $TRAVIS_BUILD_DIR/travis-install.sh .
 cp $TRAVIS_BUILD_DIR/travis-common.sh .
 # The binaries to test (statically linked, of course!)
-cp ${CABAL_BDIR}/build/unit-tests/unit-tests                         Cabal
+cp ${CABAL_BDIR}/c/unit-tests/build/unit-tests/unit-tests                         Cabal
 if [ "x$PARSEC" = "xYES" ]; then
-    cp ${CABAL_BDIR}/build/parser-tests/parser-tests                 Cabal
-    cp ${CABAL_BDIR}/build/parser-hackage-tests/parser-hackage-tests Cabal
+    cp ${CABAL_BDIR}/c/parser-tests/build/parser-tests/parser-tests                 Cabal
+    cp ${CABAL_BDIR}/c/parser-hackage-tests/build/parser-hackage-tests/parser-hackage-tests Cabal
 fi
 if [ "x$CABAL_LIB_ONLY" != "xYES" ]; then
     cp ${CABAL_INSTALL_BDIR}/build/cabal/cabal                       cabal-install