mirror of
https://github.com/nix-community/nix-direnv.git
synced 2024-09-19 07:17:10 +03:00
96 lines
2.8 KiB
Plaintext
96 lines
2.8 KiB
Plaintext
# shellcheck shell=bash
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use_nix() {
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local path direnv_dir
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path=$(nix-instantiate --find-file nixpkgs)
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direnv_dir=$(direnv_layout_dir)
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if [[ "${direnv:-}" == "" ]]; then
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log_status "\$direnv environment variable was not defined. Was this script run inside direnv?"
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fi
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local version
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if [[ -f "${path}/.version-suffix" ]]; then
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read -r version < "${path}/.version-suffix"
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elif [[ -f "${path}/.git/HEAD" ]]; then
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local head
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read -r head < "${path}/.git/HEAD"
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local regex="ref: (.*)"
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if [[ "$head" =~ $regex ]]; then
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read -r version < ".git/${BASH_REMATCH[1]}"
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else
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version="$head"
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fi
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fi
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local cache="$direnv_dir/cache-${version:-unknown}"
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local update_drv=0
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if [[ ! -e "$cache" ]] || \
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[[ "$HOME/.direnvrc" -nt "$cache" ]] || \
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[[ .envrc -nt "$cache" ]] || \
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[[ default.nix -nt "$cache" ]] || \
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[[ shell.nix -nt "$cache" ]];
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then
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[[ -d "$direnv_dir" ]] || mkdir "$direnv_dir"
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local dump_cmd tmp
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dump_cmd="echo -n _____direnv_____; \"$direnv\" dump bash"
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tmp=$(nix-shell --show-trace --pure "$@" --run "$dump_cmd" \
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| grep -oP '(?<=_____direnv_____).*')
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echo "$tmp" > "$cache"
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update_drv=1
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else
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log_status using cached derivation
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fi
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local term_backup=$TERM path_backup=$PATH
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if [[ -n ${TMPDIR+x} ]]; then
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local tmp_backup=$TMPDIR
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fi
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local impure_ssl_cert_file=${SSL_CERT_FILE:-}
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local impure_nix_ssl_cert_file=${NIX_SSL_CERT_FILE:-}
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log_status eval "$cache"
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read -r cache_content < "$cache"
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eval "$cache_content"
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export PATH=$PATH:$path_backup TERM=$term_backup
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if [[ -n ${tmp_backup+x} ]]; then
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export TMPDIR=${tmp_backup}
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else
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unset TMPDIR
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fi
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# `nix-shell --pure` sets invalid ssl certificate paths
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if [[ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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if [[ -n ${impure_ssl_cert_file+x} ]]; then
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export SSL_CERT_FILE=${impure_ssl_cert_file}
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else
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unset SSL_CERT_FILE
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fi
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fi
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if [[ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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if [[ -n ${impure_nix_ssl_cert_file+x} ]]; then
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export NIX_SSL_CERT_FILE=${impure_nix_ssl_cert_file}
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else
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unset NIX_SSL_CERT_FILE
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fi
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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
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if [[ "${out:-}" != "" ]] && (( update_drv )); then
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local drv_link="${direnv_dir}/drv" drv
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drv=$(nix show-derivation "$out" | grep -E -o -m1 '/nix/store/.*.drv')
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local stripped_pwd=${PWD/\//}
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local escaped_pwd=${stripped_pwd//-/--}
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local escaped_pwd=${escaped_pwd//\//-}
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ln -fs "$drv" "$drv_link"
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ln -fs "$drv_link" "/nix/var/nix/gcroots/per-user/$USER/$escaped_pwd"
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log_status renewed cache and derivation link
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fi
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if [[ $# = 0 ]]; then
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watch_file default.nix
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watch_file shell.nix
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fi
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}
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