nntwitter/tools/travis-install

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#!/bin/sh -e
echo "Setting up Nix-based Emacs CI support"
if ! command -v nix > /dev/null 2>&1; then
echo "Nix not installed (use 'language: nix' in Travis)" >&2
exit 1
fi
# Work around unfortunate issues in the MacOS Nix support on Travis
if [ "$(uname)" = "Darwin" ]; then
sudo mkdir -p /etc/nix
echo "trusted-users = root $USER" | sudo tee -a /etc/nix/nix.conf
sudo launchctl kickstart -k system/org.nixos.nix-daemon || true
fi
if ! command -v cachix > /dev/null 2>&1; then
echo "Installing cachix"
nix-env -iA cachix -f https://cachix.org/api/v1/install
fi
echo "Enabling download of precompiled binaries"
cachix use emacs-ci
if [ -n "$EMACS_CI" ]; then
echo "Installing and activating version: $EMACS_CI"
nix-env -iA "$EMACS_CI" -f https://github.com/purcell/nix-emacs-ci/archive/emacs-snapshot-2019-10-16.tar.gz
readlink "$(command -v emacs)"
else
echo "EMACS_CI not set: skipping auto-install of any emacs version"
fi