testing/idris: use cabal freeze and sandbox for great good

1 files changed, 68 insertions, 28 deletions

diff --git a/testing/idris/APKBUILD b/testing/idris/APKBUILD
index 4f8bb22b6e..2222b3c30d 100644
--- a/testing/idris/APKBUILD
+++ b/testing/idris/APKBUILD
@@ -1,4 +1,9 @@
+# Contributor: Mitch Tishmack <mitch.tishmack@gmail.com>
+# Contributor: Jakub Jirutka <jakub@jirutka.cz>
 # Maintainer: Mitch Tishmack <mitch.tishmack@gmail.com>
+#
+# Note: This abuilds downloads Haskell dependencies in the prepare phase
+#       without any verification!
 pkgname=idris
 pkgver=1.0
 pkgrel=0
@@ -9,44 +14,78 @@ license="BSD3"
 depends="gmp-dev gcc"
 makedepends="ghc cabal libffi-dev ncurses-dev zlib-dev"
 subpackages="$pkgname-doc"
-source="$pkgname-$pkgver.tar.gz::https://github.com/idris-lang/Idris-dev/archive/v$pkgver.tar.gz"
+source="$pkgname-$pkgver.tar.gz::https://github.com/idris-lang/Idris-dev/archive/v$pkgver.tar.gz
+	cabal.config"
 builddir="$srcdir/Idris-dev-$pkgver"
 
-_home="$builddir/deps"
-_tmp="$builddir/tmp"
+export CABAL_CONFIG="$srcdir/cabal/cabal.config"
+
+cabal_update() {
+	msg "Updating constraints"
+
+	cd "$builddir"
+
+	# Create cabal config and fetch index.
+	HOME="${CABAL_CONFIG%/*}" cabal update
+
+	# Resolve deps and generate fresh cabal.config with version constraints.
+	rm -f cabal.config
+	cabal freeze
+
+	# Add version tag at the first line.
+	sed -i "1i--$pkgver" cabal.config
+
+	mv cabal.config "$startdir"/
+
+	cd "$startdir"
+	abuild checksum
+}
 
 prepare() {
 	default_prepare
 
+	if [ "$(head -n 1 "$srcdir"/cabal.config)" != "--$pkgver" ]; then
+		die "Requirements file is outdated, run 'abuild cabal_update'"
+	fi
+
 	cd "$builddir"
-	mkdir -p "$_tmp" "$_home"
-	(
-		export HOME="$_home"
-		export TMPDIR="$_tmp"
-		cabal update
-		cabal install libffi -v
-		cabal install --dependencies-only -v
-	)
+
+	# Create cabal config and fetch index.
+	HOME="${CABAL_CONFIG%/*}" cabal update
+
+	# Cabal implicitly loads cabal.config from the project's directory.
+	ln -sf "$srcdir"/cabal.config .
+
+	# Create Cabal sandbox that will be used for all subsequent cabal
+	# invocations. This is something like Python virtual env.
+	cabal sandbox init
+
+	# Fetch all dependencies.
+	# XXX: This should always fetch the same versions as defined in
+	# our cabal.config, but Cabal does not verify packages integrity!
+	cabal fetch libffi .
 }
 
 build() {
 	cd "$builddir"
-	(
-		export HOME="$_home"
-		export TMPDIR="$_tmp"
-		# Note, ordering of prefixes is important!
-		cabal configure --prefix='/usr' \
-			--docdir='$prefix/share/doc' \
-			--datadir='$prefix/share' \
-			--htmldir='$docdir/html' \
-			--libdir='$prefix/lib' \
-			--libsubdir="$pkgname" \
-			--datasubdir="$pkgname" \
-			--dynlibdir="$pkgname" \
-			--disable-shared \
-			--flags='GMP FFI standalone'
-		cabal build
-	)
+
+	# Build dependencies.
+	cabal install --offline -v libffi
+	cabal install --only-dependencies --offline -v
+
+	# Note: ordering of prefixes is important!
+	cabal configure \
+		--prefix='/usr' \
+		--docdir='$prefix/share/doc' \
+		--datadir='$prefix/share' \
+		--htmldir='$docdir/html' \
+		--libdir='$prefix/lib' \
+		--libsubdir="$pkgname" \
+		--datasubdir="$pkgname" \
+		--dynlibdir="$pkgname" \
+		--disable-shared \
+		--flags='GMP FFI standalone'
+	cabal build
 }
 
 # TODO: Run upstream tests and/or figure out how to set paths to be able
@@ -73,4 +112,5 @@ package() {
 	mv usr/share/doc/LICENSE usr/share/licenses/$pkgname/
 }
 
-sha512sums="a350004a8510f01d1cc8f965a9a4e2dab219f003980b98354ebb5ae42f73b32c90c98dce193943e9709d994cb92ad35814a46b79412a1afc85d42e1018c6ba10  idris-1.0.tar.gz"
+sha512sums="a350004a8510f01d1cc8f965a9a4e2dab219f003980b98354ebb5ae42f73b32c90c98dce193943e9709d994cb92ad35814a46b79412a1afc85d42e1018c6ba10  idris-1.0.tar.gz
+e078892987816012034295be81118fbc710e3dbf08af18257e5390fc159bb5d64e1aae8a802835ca92b1e0d065524833d657bc9edffc9ebefc8cb5c02935694a  cabal.config"