rewrite to bash

lib/install-nix.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export here=$(dirname "${BASH_SOURCE[0]}")
+
+nixConf() {
+  sudo mkdir -p /etc/nix
+  # Workaround a segfault: https://github.com/NixOS/nix/issues/2733
+  sudo sh -c 'echo http2 = false >> /etc/nix/nix.conf'
+  # Set jobs to number of cores
+  sudo sh -c 'echo max-jobs = auto >> /etc/nix/nix.conf'
+  # Allow binary caches for runner user
+  sudo sh -c 'echo trusted-users = root runner >> /etc/nix/nix.conf'
+}
+
+if [[ $OSTYPE =~ darwin ]]; then
+  # Catalina workaround https://github.com/NixOS/nix/issues/2925
+  $here/create-darwin-volume.sh
+
+  # Disable spotlight indexing of /nix to speed up performance
+  sudo mdutil -i off /nix
+fi
+
+nixConf
+
+# Needed due to multi-user being too defensive
+export ALLOW_PREEXISTING_INSTALLATION=1
+
+sh <(curl https://nixos.org/nix/install) --daemon
+
+# write nix.conf again as installation overwrites it
+nixConf
+
+# macOS needs certificates hints
+if [[ $OSTYPE =~ darwin ]]; then
+  cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
+  echo "::set-env name=NIX_SSL_CERT_FILE::$cert_file"
+  export NIX_SSL_CERT_FILE=$cert_file
+  sudo launchctl setenv NIX_SSL_CERT_FILE "$cert_file"
+fi
+
+# Reload the daemon to pick up changes
+sudo pkill -HUP nix-daemon
+
+# Set paths
+echo "::add-path::/nix/var/nix/profiles/per-user/runner/profile/bin"
+echo "::add-path::/nix/var/nix/profiles/default/bin"
+echo "::set-env name=NIX_PATH::/nix/var/nix/profiles/per-user/root/channels"