Test the installer

.travis.yml

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+os: osx
+script: ./tests/install-darwin.sh

tests/install-darwin.sh

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+#!/bin/sh
+
+cleanup() {
+    PLIST="/Library/LaunchDaemons/org.nixos.nix-daemon.plist"
+    if sudo launchctl list | grep -q nix-daemon; then
+        sudo launchctl unload "$PLIST"
+    fi
+
+    if [ -f "$PLIST" ]; then
+        sudo rm /Library/LaunchDaemons/org.nixos.nix-daemon.plist
+    fi
+
+    profiles=(/etc/profile /etc/bashrc /etc/zshrc)
+    for profile in "${profiles[@]}"; do
+        if [ -f "${profile}.backup-before-nix" ]; then
+            sudo mv "${profile}.backup-before-nix" "${profile}"
+        fi
+    done
+
+    for i in $(seq 1 $(sysctl -n hw.ncpu)); do
+        sudo /usr/bin/dscl . -delete "/Users/nixbld$i" || true
+    done
+    sudo /usr/bin/dscl . -delete "/Groups/nixbld" || true
+
+
+    sudo rm -rf /etc/nix \
+         /nix \
+         /var/root/.nix-profile /var/root/.nix-defexpr /var/root/.nix-channels \
+         "$USER/.nix-profile" "$USER/.nix-defexpr" "$USER/.nix-channels"
+}
+
+verify() {
+    output=$(echo "nix-shell -p bash --run 'echo toow | rev'" | bash -l)
+    test "$output" = "woot"
+}
+
+scratch=$(mktemp -d -t tmp.XXXXXXXXXX)
+function finish {
+    rm -rf "$scratch"
+}
+trap finish EXIT
+
+# First setup Nix
+cleanup
+curl https://nixos.org/nix/install | bash
+verify
+
+
+(
+    nix-build ./release.nix -A binaryTarball.x86_64-darwin
+    cp ./result/nix-*.tar.bz2 $scratch/nix.tar.bz2
+)
+
+(
+    cd $scratch
+    tar -xf ./nix.tar.bz2
+
+    cd nix-*
+
+    set -eux
+
+    cat ~/.profile | grep -v nix-profile > ~/.profile-next
+    mv ~/.profile-next ~/.profile
+
+    cleanup
+
+    yes | ./install
+    verify
+
+    cleanup
+
+    yes | ./install
+    verify
+
+    cleanup
+)