[DDW-1110] Turn off Boehm GC in Nix

Author: michalrus

.buildkite/pipeline.yml

@@ -2,26 +2,26 @@ env:
   ARTIFACT_BUCKET: s3://ci-output-sink
 steps:
   - label: 'daedalus-x86_64-darwin'
-    command: 'scripts/build-installer-unix.sh--nix-2.5 --build-id $BUILDKITE_BUILD_NUMBER'
+    command: 'scripts/with-nix-2.5.sh scripts/build-installer-unix.sh --build-id $BUILDKITE_BUILD_NUMBER'
     env:
       NIX_SSL_CERT_FILE: /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
     agents:
       queue: daedalus
       system: x86_64-darwin
   - label: 'daedalus-aarch64-darwin'
-    command: 'scripts/build-installer-unix.sh--nix-2.5 --build-id $BUILDKITE_BUILD_NUMBER'
+    command: 'scripts/with-nix-2.5.sh scripts/build-installer-unix.sh --build-id $BUILDKITE_BUILD_NUMBER'
     env:
       NIX_SSL_CERT_FILE: /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
       UPLOAD_DIR_OVERRIDE: UNSAFE-internal-build
     agents:
       queue: daedalus
       system: aarch64-darwin
   - label: 'daedalus-x86_64-linux-nix'
-    command: 'scripts/build-installer-nix.sh $BUILDKITE_BUILD_NUMBER'
+    command: 'scripts/with-nix-2.5.sh scripts/build-installer-nix.sh $BUILDKITE_BUILD_NUMBER'
     agents:
       system: x86_64-linux
   - label: 'daedalus-x86_64-windows-nix'
-    command: 'scripts/build-cross-windows.sh $BUILDKITE_BUILD_NUMBER'
+    command: 'scripts/with-nix-2.5.sh scripts/build-cross-windows.sh $BUILDKITE_BUILD_NUMBER'
     agents:
       system: x86_64-linux
 

scripts/build-installer-unix.sh--nix-2.5

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -e
+
+if [ $# -eq 0 ] ; then
+  echo >&2 "fatal: usage: $0 <command> [<args>...]"
+  exit 1
+fi
+
+echo "~~~ Obtaining ‘pkgs.nixUnstable’"
+
+myDir=$(dirname "$0")
+nixUnstable=$(nix-build "$myDir"/../default.nix -A pkgs.nixUnstable)
+
+PATH="$nixUnstable/bin:$PATH"
+
+# *Maybe* prevent segfaults on `aarch64-darwin` in `GC_*` code:
+export GC_DONT_GC=1 # <https://chromium.googlesource.com/chromiumos/third_party/gcc/+/f4131b9cddd80547d860a6424ee1644167a330d6/gcc/gcc-4.6.0/boehm-gc/doc/README.environment#151>
+
+export NIX_CONFIG='
+  experimental-features = nix-command flakes
+'
+
+nix --version
+echo
+
+echo "~~~ Running ‘$1’"
+
+exec "$@"