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#!/usr/bin/env bash | ||
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# from https://github.com/direnv/direnv/wiki/Nix | ||
# based on https://github.com/Mic92/dotfiles/blob/a0a9b7e358fa70a85cd468f8ca1fbb02ae0a91df/home/.direnvrc | ||
use_nix() { | ||
local path="$(nix-instantiate --find-file nixpkgs)" | ||
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if [ -f "${path}/.version-suffix" ]; then | ||
local version="$(< $path/.version-suffix)" | ||
elif [ -f "${path}/.git" ]; then | ||
local version="$(< $(< ${path}/.git/HEAD))" | ||
fi | ||
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local cache=".direnv/cache-${version:-unknown}" | ||
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local update_drv=0 | ||
if [[ ! -e "$cache" ]] || \ | ||
[[ "$HOME/.direnvrc" -nt "$cache" ]] || \ | ||
[[ .envrc -nt "$cache" ]] || \ | ||
[[ default.nix -nt "$cache" ]] || \ | ||
[[ shell.nix -nt "$cache" ]]; | ||
then | ||
[ -d .direnv ] || mkdir .direnv | ||
nix-shell --show-trace --pure "$@" --run "\"$direnv\" dump bash" > "$cache" | ||
update_drv=1 | ||
else | ||
log_status using cached derivation | ||
fi | ||
local term_backup=$TERM path_backup=$PATH | ||
if [ -n ${TMPDIR+x} ]; then | ||
local tmp_backup=$TMPDIR | ||
fi | ||
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eval "$(< $cache)" | ||
export PATH=$PATH:$path_backup TERM=$term_backup TMPDIR=$tmp_backup | ||
if [ -n ${tmp_backup+x} ]; then | ||
export TMPDIR=${tmp_backup} | ||
else | ||
unset TMPDIR | ||
fi | ||
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# `nix-shell --pure` sets invalid ssl certificate paths | ||
if [ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]; then | ||
unset SSL_CERT_FILE | ||
fi | ||
if [ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]; then | ||
unset NIX_SSL_CERT_FILE | ||
fi | ||
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# This part is based on https://discourse.nixos.org/t/what-is-the-best-dev-workflow-around-nix-shell/418/4 | ||
if [ "$out" ] && (( $update_drv )); then | ||
local drv_link=".direnv/drv" | ||
local drv="$(nix show-derivation $out | grep -E -o -m1 '/nix/store/.*.drv')" | ||
local stripped_pwd=${PWD/\//} | ||
local escaped_pwd=${stripped_pwd//-/--} | ||
local escaped_pwd=${escaped_pwd//\//-} | ||
ln -fs "$drv" "$drv_link" | ||
ln -fs "$PWD/$drv_link" "/nix/var/nix/gcroots/per-user/$LOGNAME/$escaped_pwd" | ||
log_status renewed cache and derivation link | ||
fi | ||
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if [[ $# = 0 ]]; then | ||
watch_file default.nix | ||
watch_file shell.nix | ||
fi | ||
} |