install-nix-action/lib/install-nix.sh
2022-03-25 15:35:01 -07:00

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#!/usr/bin/env bash
set -euo pipefail
if type -p nix &>/dev/null ; then
echo "Aborting: Nix is already installed at $(type -p nix)"
exit
fi
# Create a temporary workdir
workdir=$(mktemp -d)
trap 'rm -rf "$workdir"' EXIT
# Configure Nix
add_config() {
echo "$1" | tee -a "$workdir/nix.conf" >/dev/null
}
# Set jobs to number of cores
add_config "max-jobs = auto"
# Allow binary caches for user
add_config "trusted-users = root $USER"
# Append extra nix configuration if provided
if [[ $INPUT_EXTRA_NIX_CONFIG != "" ]]; then
add_config "$INPUT_EXTRA_NIX_CONFIG"
fi
if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "experimental-features" ]]; then
add_config "experimental-features = nix-command flakes"
fi
# Nix installer flags
installer_options=(
--no-channel-add
--darwin-use-unencrypted-nix-store-volume
--nix-extra-conf-file "$workdir/nix.conf"
)
# only use the nix-daemon settings if on darwin (which get ignored) or systemd is supported
if [[ $OSTYPE =~ darwin || -e /run/systemd/system ]]; then
installer_options+=(
--daemon
--daemon-user-count "$(python -c 'import multiprocessing as mp; print(mp.cpu_count() * 2)')"
)
else
# "fix" the following error when running nix*
# error: the group 'nixbld' specified in 'build-users-group' does not exist
add_config "build-users-group ="
sudo mkdir -p /etc/nix
sudo chmod 0755 /etc/nix
cp $workdir/nix.conf /etc/nix/nix.conf
fi
if [[ $INPUT_INSTALL_OPTIONS != "" ]]; then
IFS=' ' read -r -a extra_installer_options <<< "$INPUT_INSTALL_OPTIONS"
installer_options=("${extra_installer_options[@]}" "${installer_options[@]}")
fi
echo "installer options: ${installer_options[*]}"
# There is --retry-on-errors, but only newer curl versions support that
curl_retries=5
while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://nixos.org/nix/install}"
do
sleep 1
((curl_retries--))
if [[ $curl_retries -le 0 ]]; then
echo "curl retries failed" >&2
exit 1
fi
done
sh "$workdir/install" "${installer_options[@]}"
if [[ $OSTYPE =~ darwin ]]; then
# macOS needs certificates hints
cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
echo "NIX_SSL_CERT_FILE=$cert_file" >> "$GITHUB_ENV"
export NIX_SSL_CERT_FILE=$cert_file
sudo launchctl setenv NIX_SSL_CERT_FILE "$cert_file"
fi
# Set paths
echo "/nix/var/nix/profiles/per-user/$USER/profile/bin" >> "$GITHUB_PATH"
echo "/nix/var/nix/profiles/default/bin" >> "$GITHUB_PATH"
if [[ $INPUT_NIX_PATH != "" ]]; then
echo "NIX_PATH=${INPUT_NIX_PATH}" >> "$GITHUB_ENV"
fi