lib: Fix system parsing, and use for doubles lists

The old hard-coded lists are now used to test system parsing.

In the process, make an `assertTrue` in release lib for eval tests; also
use it in release-cross

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/tests/systems.nix b/lib/tests/systems.nix
new file mode 100644
index 00000000000..02e316c19fe
--- /dev/null
+++ b/lib/tests/systems.nix
@@ -0,0 +1,31 @@
+# We assert that the new algorithmic way of generating these lists matches the
+# way they were hard-coded before.
+#
+# One might think "if we exhaustively test, what's the point of procedurally
+# calculating the lists anyway?". The answer is one can mindlessly update these
+# tests as new platforms become supported, and then just give the diff a quick
+# sanity check before committing :).
+{ lib, assertTrue }:
+
+with lib.systems.doubles;
+
+let mseteq = x: y: lib.sort lib.lessThan x == lib.sort lib.lessThan y; in
+
+{
+  all = assertTrue (mseteq all (linux ++ darwin ++ cygwin ++ freebsd ++ openbsd ++ netbsd ++ illumos));
+
+  arm = assertTrue (mseteq arm [ "armv5tel-linux" "armv6l-linux" "armv7l-linux" ]);
+  i686 = assertTrue (mseteq i686 [ "i686-linux" "i686-freebsd" "i686-netbsd" "i686-cygwin" ]);
+  mips = assertTrue (mseteq mips [ "mips64el-linux" ]);
+  x86_64 = assertTrue (mseteq x86_64 [ "x86_64-linux" "x86_64-darwin" "x86_64-freebsd" "x86_64-openbsd" "x86_64-netbsd" "x86_64-cygwin" ]);
+
+  cygwin = assertTrue (mseteq cygwin [ "i686-cygwin" "x86_64-cygwin" ]);
+  darwin = assertTrue (mseteq darwin [ "x86_64-darwin" ]);
+  freebsd = assertTrue (mseteq freebsd [ "i686-freebsd" "x86_64-freebsd" ]);
+  gnu = assertTrue (mseteq gnu (linux /* ++ hurd ++ kfreebsd ++ ... */));
+  illumos = assertTrue (mseteq illumos [ "x86_64-solaris" ]);
+  linux = assertTrue (mseteq linux [ "i686-linux" "x86_64-linux" "armv5tel-linux" "armv6l-linux" "armv7l-linux" "aarch64-linux" "mips64el-linux" ]);
+  netbsd = assertTrue (mseteq netbsd [ "i686-netbsd" "x86_64-netbsd" ]);
+  openbsd = assertTrue (mseteq openbsd [ "i686-openbsd" "x86_64-openbsd" ]);
+  unix = assertTrue (mseteq unix (linux ++ darwin ++ freebsd ++ openbsd ++ netbsd ++ illumos));
+}