install-nix-action/install-nix.sh

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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 $(type -p nix)"
exit
fi
# GitHub command to put the following log messages into a group which is collapsed by default
echo "::group::Installing Nix"
# Create a temporary workdir
workdir=$(mktemp -d)
trap 'rm -rf "$workdir"' EXIT
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# Configure Nix
add_config() {
echo "$1" | tee -a "$workdir/nix.conf" >/dev/null
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}
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# Set jobs to number of cores
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add_config "max-jobs = auto"
# Allow binary caches for user
add_config "trusted-users = root $USER"
# Add github access token
if [[ -n "${INPUT_GITHUB_ACCESS_TOKEN:-}" ]]; then
add_config "access-tokens = github.com=$INPUT_GITHUB_ACCESS_TOKEN"
elif [[ -n "${GITHUB_TOKEN:-}" ]]; then
add_config "access-tokens = github.com=$GITHUB_TOKEN"
fi
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# Append extra nix configuration if provided
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if [[ $INPUT_EXTRA_NIX_CONFIG != "" ]]; then
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add_config "$INPUT_EXTRA_NIX_CONFIG"
fi
if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "experimental-features" ]]; then
add_config "experimental-features = nix-command flakes"
fi
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# Nix installer flags
installer_options=(
--no-channel-add
--darwin-use-unencrypted-nix-store-volume
--nix-extra-conf-file "$workdir/nix.conf"
)
# only use the nix-daemon settings if on darwin (which get ignored) or systemd is supported
if [[ (! $INPUT_INSTALL_OPTIONS =~ "--no-daemon") && ($OSTYPE =~ darwin || -e /run/systemd/system) ]]; then
installer_options+=(
--daemon
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--daemon-user-count "$(python3 -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
sudo cp $workdir/nix.conf /etc/nix/nix.conf
fi
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if [[ $INPUT_INSTALL_OPTIONS != "" ]]; then
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IFS=' ' read -r -a extra_installer_options <<< "$INPUT_INSTALL_OPTIONS"
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installer_options=("${extra_installer_options[@]}" "${installer_options[@]}")
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fi
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echo "installer options: ${installer_options[*]}"
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# There is --retry-on-errors, but only newer curl versions support that
curl_retries=5
while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://nixos.org/nix/install}"
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do
sleep 1
((curl_retries--))
if [[ $curl_retries -le 0 ]]; then
echo "curl retries failed" >&2
exit 1
fi
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done
sh "$workdir/install" "${installer_options[@]}"
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if [[ $OSTYPE =~ darwin ]]; then
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# macOS needs certificates hints
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cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
echo "NIX_SSL_CERT_FILE=$cert_file" >> "$GITHUB_ENV"
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export NIX_SSL_CERT_FILE=$cert_file
sudo launchctl setenv NIX_SSL_CERT_FILE "$cert_file"
fi
# Set paths
echo "/nix/var/nix/profiles/default/bin" >> "$GITHUB_PATH"
echo "/nix/var/nix/profiles/per-user/$USER/profile/bin" >> "$GITHUB_PATH"
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if [[ $INPUT_NIX_PATH != "" ]]; then
echo "NIX_PATH=${INPUT_NIX_PATH}" >> "$GITHUB_ENV"
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fi
# Close the log message group which was opened above
echo "::endgroup::"