libressl: upstream tweaks

Formula/libressl.rb

@@ -27,18 +27,13 @@ def install
       --prefix=#{prefix}
       --with-openssldir=#{etc}/libressl
       --sysconfdir=#{etc}/libressl
-      --with-enginesdir=#{lib}/engines
     ]
 
     system "./autogen.sh" if build.head?
     system "./configure", *args
     system "make"
     system "make", "check"
     system "make", "install"
-
-    # Install the dummy openssl.cnf file to stop runtime warnings.
-    (etc/"libressl/certs").mkpath
-    (etc/"libressl").install "apps/openssl.cnf"
   end
 
   def post_install
@@ -61,6 +56,8 @@ def post_install
       $?.success?
     end
 
+    # LibreSSL install a default pem - We prefer to use OS X for consistency.
+    rm_f etc/"libressl/cert.pem"
     (etc/"libressl/cert.pem").atomic_write(valid_certs.join("\n"))
   end
 
@@ -75,9 +72,14 @@ def caveats; <<-EOS.undent
   end
 
   test do
+    # Make sure the necessary .cnf file exists, otherwise LibreSSL gets moody.
+    assert (HOMEBREW_PREFIX/"etc/libressl/openssl.cnf").exist?,
+            "LibreSSL requires the .cnf file for some functionality"
+
+    # Check LibreSSL itself functions as expected.
     (testpath/"testfile.txt").write("This is a test file")
-    expected_checksum = "91b7b0b1e27bfbf7bc646946f35fa972c47c2d32"
-    system bin/"openssl", "dgst", "-sha1", "-out", "checksum.txt", "testfile.txt"
+    expected_checksum = "e2d0fe1585a63ec6009c8016ff8dda8b17719a637405a4e23c0ff81339148249"
+    system "#{bin}/openssl", "dgst", "-sha256", "-out", "checksum.txt", "testfile.txt"
     open("checksum.txt") do |f|
       checksum = f.read(100).split("=").last.strip
       assert_equal checksum, expected_checksum