Move Travis script to shell script, control GHC 7.0/7.2 testing via environment variable.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

.travis.yml

@@ -8,7 +8,7 @@ env:
  - GHCVER=7.6.3
  - GHCVER=7.8.4
  - GHCVER=7.10.3
- - GHCVER=8.0.1
+ - GHCVER=8.0.1 TEST_OLDER=YES
  # TODO add PARSEC_BUNDLED=YES when it's so
  - GHCVER=head
 
@@ -17,7 +17,7 @@ before_install:
  - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
  - travis_retry sudo apt-get update
  - travis_retry sudo apt-get install cabal-install-1.24 ghc-$GHCVER-prof ghc-$GHCVER-dyn happy
- - travis_retry sudo apt-get install ghc-7.0.4-prof ghc-7.0.4-dyn ghc-7.2.2-prof ghc-7.2.2-dyn
+ - if [ "$TEST_OLDER" == "YES" ]; then travis_retry sudo apt-get install ghc-7.0.4-prof ghc-7.0.4-dyn ghc-7.2.2-prof ghc-7.2.2-dyn; fi
  - export PATH=$HOME/.cabal/bin:/opt/ghc/$GHCVER/bin:/opt/cabal/1.24/bin:$PATH
  - git version
 
@@ -31,62 +31,7 @@ install:
 # ./dist/setup/setup here instead of cabal-install to avoid breakage when the
 # build config format changed.
 script:
- # We depend on parsec nowadays, which isn't distributed with GHC <8.0
- - if [ "$PARSEC_BUNDLED" != "YES" ]; then cabal install parsec; fi
-
-# Cabal
- - cd Cabal
-# Test if gen-extra-source-files.sh was run recently enough
- - ./misc/gen-extra-source-files.sh Cabal.cabal
- - ./misc/travis-diff-files.sh
- - mkdir -p ./dist/setup
- - cp Setup.hs ./dist/setup/setup.hs
- - ghc --make -odir ./dist/setup -hidir ./dist/setup -i -i. ./dist/setup/setup.hs -o ./dist/setup/setup -Wall -Werror -threaded  # the command cabal-install would use to build setup
-
-# Install test dependencies only after setup is built
- - cabal install --only-dependencies --enable-tests --enable-benchmarks
- - ./dist/setup/setup configure --user --ghc-option=-Werror --enable-tests --enable-benchmarks -v2 # -v2 provides useful information for debugging
- - ./dist/setup/setup build   # this builds all libraries and executables (including tests/benchmarks)
- - ./dist/setup/setup haddock # see https://github.com/haskell/cabal/issues/2198
- - ./dist/setup/setup test --show-details=streaming --test-option=--hide-successes
-# Redo the package tests with different versions of GHC
- - CABAL_PACKAGETESTS_WITH_GHC=/opt/ghc/7.0.4/bin/ghc ./dist/setup/setup test package-tests --show-details=streaming
- - CABAL_PACKAGETESTS_WITH_GHC=/opt/ghc/7.2.2/bin/ghc ./dist/setup/setup test package-tests --show-details=streaming
- - cabal check
- - cabal sdist   # tests that a source-distribution can be generated
-
-# The following scriptlet checks that the resulting source distribution can be
-# built & installed.
- - function install_from_tarball {
-   export SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}') ;
-   if [ -f "dist/$SRC_TGZ" ]; then
-      cabal install -j1 "dist/$SRC_TGZ" -v2;
-   else
-      echo "expected 'dist/$SRC_TGZ' not found";
-      exit 1;
-   fi
-   }
-
- - install_from_tarball
-
-# Also build cabal-install.
- - cd ../cabal-install
- - ../Cabal/misc/gen-extra-source-files.sh cabal-install.cabal
- - ../Cabal/misc/travis-diff-files.sh
-
- - cabal install happy
- - cabal install --only-dependencies --enable-tests --enable-benchmarks
- - cabal configure --user --ghc-option=-Werror --enable-tests --enable-benchmarks -v2 # -v2 provides useful information for debugging
- - cabal build
- - cabal haddock # see https://github.com/haskell/cabal/issues/2198
- - cabal test unit-tests --show-details=streaming --test-option=--hide-successes
- - cabal test integration-tests --show-details=streaming --test-option=--hide-successes
- - cabal check
- - ./dist/setup/setup sdist
- - install_from_tarball
-
-# Check what we got
- - $HOME/.cabal/bin/cabal --version
+ - ./travis-script.sh
 
 matrix:
   allow_failures:

travis-script.sh

+#!/usr/bin/env bash
+set -ev
+
+# Initial working directory: base directory of Git repository
+
+# We depend on parsec nowadays, which isn't distributed with GHC <8.0
+if [ "$PARSEC_BUNDLED" != "YES" ]; then
+    cabal install parsec
+fi
+
+# ---------------------------------------------------------------------
+# Cabal
+# ---------------------------------------------------------------------
+
+cd Cabal
+
+# Test if gen-extra-source-files.sh was run recently enough
+./misc/gen-extra-source-files.sh Cabal.cabal
+./misc/travis-diff-files.sh
+
+# Build the setup script in the same way that cabal-install would:
+mkdir -p ./dist/setup
+cp Setup.hs ./dist/setup/setup.hs
+ghc --make \
+    -odir ./dist/setup -hidir ./dist/setup -i -i. \
+    ./dist/setup/setup.hs -o ./dist/setup/setup \
+    -Wall -Werror -threaded
+
+# Install test dependencies only after setup is built
+cabal install --only-dependencies --enable-tests --enable-benchmarks
+./dist/setup/setup configure \
+    --user --ghc-option=-Werror --enable-tests --enable-benchmarks \
+    -v2 # -v2 provides useful information for debugging
+
+# Build all libraries and executables (including tests/benchmarks)
+./dist/setup/setup build
+./dist/setup/setup haddock # see https://github.com/haskell/cabal/issues/2198
+./dist/setup/setup test --show-details=streaming --test-option=--hide-successes
+
+# Redo the package tests with different versions of GHC
+if [ "$TEST_OLDER" == "YES" ]; then
+    CABAL_PACKAGETESTS_WITH_GHC=/opt/ghc/7.0.4/bin/ghc \
+        ./dist/setup/setup test package-tests --show-details=streaming
+    CABAL_PACKAGETESTS_WITH_GHC=/opt/ghc/7.2.2/bin/ghc \
+        ./dist/setup/setup test package-tests --show-details=streaming
+fi
+
+cabal check
+cabal sdist   # tests that a source-distribution can be generated
+
+# The following scriptlet checks that the resulting source distribution can be
+# built & installed.
+function install_from_tarball {
+   export SRC_TGZ=$(cabal info . | awk '{print $2 ".tar.gz";exit}') ;
+   if [ -f "dist/$SRC_TGZ" ]; then
+      cabal install -j1 "dist/$SRC_TGZ" -v2;
+   else
+      echo "expected 'dist/$SRC_TGZ' not found";
+      exit 1;
+   fi
+}
+
+install_from_tarball
+
+# ---------------------------------------------------------------------
+# cabal-install
+# ---------------------------------------------------------------------
+
+cd ../cabal-install
+../Cabal/misc/gen-extra-source-files.sh cabal-install.cabal
+../Cabal/misc/travis-diff-files.sh
+
+cabal install happy
+cabal install --only-dependencies --enable-tests --enable-benchmarks
+cabal configure \
+    --user --ghc-option=-Werror --enable-tests --enable-benchmarks \
+    -v2 # -v2 provides useful information for debugging
+cabal build
+cabal haddock # see https://github.com/haskell/cabal/issues/2198
+cabal test unit-tests --show-details=streaming --test-option=--hide-successes
+cabal test integration-tests --show-details=streaming --test-option=--hide-successes
+cabal check
+./dist/setup/setup sdist
+install_from_tarball
+
+# Check what we got
+$HOME/.cabal/bin/cabal --version