From d93f2c38659b6ec5a61428ce504626e742c2a361 Mon Sep 17 00:00:00 2001
From: Dan Peebles <pumpkin@me.com>
Date: Sun, 9 Apr 2017 09:39:30 -0400
Subject: [PATCH] darwin.libSystem: fix intermittent impurity bug

If you've seen issues with libsystem_symptoms.dylib,
this should fix that.
---
 .../Libsystem/default.nix                     |  6 ++-
 .../Libsystem/reexported_libraries            | 41 +++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/os-specific/darwin/apple-source-releases/Libsystem/reexported_libraries

diff --git a/pkgs/os-specific/darwin/apple-source-releases/Libsystem/default.nix b/pkgs/os-specific/darwin/apple-source-releases/Libsystem/default.nix
index 92c54d9b679e..ea5aac60ab95 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/Libsystem/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/Libsystem/default.nix
@@ -76,7 +76,11 @@ appleDerivation rec {
        /usr/lib/libSystem.dylib \
        -reexported_symbols_list ${./system_symbols}
 
-    libs=$(otool -arch x86_64 -L /usr/lib/libSystem.dylib | tail -n +3 | awk '{ print $1 }')
+    # We used to determine these impurely based on the host system, but then when we got some 10.12 Hydra boxes,
+    # one of them accidentally built this derivation, referenced libsystem_symptoms.dylib, which doesn't exist on
+    # 10.11, and then broke all subsequent builds on 10.11. By picking a 10.11 compatible subset of the libraries,
+    # we avoid scary impurity issues like that.
+    libs=$(cat ${./reexported_libraries} | grep -v '^#')
 
     for i in $libs; do
       if [ "$i" != "/usr/lib/system/libsystem_kernel.dylib" ] && [ "$i" != "/usr/lib/system/libsystem_c.dylib" ]; then
diff --git a/pkgs/os-specific/darwin/apple-source-releases/Libsystem/reexported_libraries b/pkgs/os-specific/darwin/apple-source-releases/Libsystem/reexported_libraries
new file mode 100644
index 000000000000..00aaba1d4982
--- /dev/null
+++ b/pkgs/os-specific/darwin/apple-source-releases/Libsystem/reexported_libraries
@@ -0,0 +1,41 @@
+# These are generated with otool -L /usr/lib/libSystem.dylib on a 10.11 machine
+/usr/lib/system/libcache.dylib
+/usr/lib/system/libcommonCrypto.dylib
+/usr/lib/system/libcompiler_rt.dylib
+/usr/lib/system/libcopyfile.dylib
+/usr/lib/system/libcorecrypto.dylib
+/usr/lib/system/libdispatch.dylib
+/usr/lib/system/libdyld.dylib
+/usr/lib/system/libkeymgr.dylib
+/usr/lib/system/liblaunch.dylib
+/usr/lib/system/libmacho.dylib
+/usr/lib/system/libquarantine.dylib
+/usr/lib/system/libremovefile.dylib
+/usr/lib/system/libsystem_asl.dylib
+/usr/lib/system/libsystem_blocks.dylib
+
+# We handle this specially in the expression
+# /usr/lib/system/libsystem_c.dylib
+
+/usr/lib/system/libsystem_configuration.dylib
+/usr/lib/system/libsystem_coreservices.dylib
+/usr/lib/system/libsystem_coretls.dylib
+/usr/lib/system/libsystem_dnssd.dylib
+/usr/lib/system/libsystem_info.dylib
+
+# We handle this specially in the expression
+# /usr/lib/system/libsystem_kernel.dylib
+
+/usr/lib/system/libsystem_m.dylib
+/usr/lib/system/libsystem_malloc.dylib
+/usr/lib/system/libsystem_network.dylib
+/usr/lib/system/libsystem_networkextension.dylib
+/usr/lib/system/libsystem_notify.dylib
+/usr/lib/system/libsystem_platform.dylib
+/usr/lib/system/libsystem_pthread.dylib
+/usr/lib/system/libsystem_sandbox.dylib
+/usr/lib/system/libsystem_secinit.dylib
+/usr/lib/system/libsystem_trace.dylib
+/usr/lib/system/libunc.dylib
+/usr/lib/system/libunwind.dylib
+/usr/lib/system/libxpc.dylib