mirror of
https://github.com/nix-community/nix-direnv.git
synced 2025-11-08 19:46:11 +01:00
74 lines
2.2 KiB
Text
74 lines
2.2 KiB
Text
use_nix() {
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local path="$(nix-instantiate --find-file nixpkgs)"
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local version
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if [[ -f "${path}/.version-suffix" ]]; then
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read 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 head < "${path}/.git/HEAD"
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local regex="ref: (.*)"
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if [[ "$head" =~ $regex ]]; then
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read version < ".git/${BASH_REMATCH[1]}"
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else
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version="$head"
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fi
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fi
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local cache=".direnv/cache-${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 ]] || mkdir .direnv
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local dump_cmd="echo -n _____direnv_____; \"$direnv\" dump bash"
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local tmp=$(nix-shell --show-trace --pure "$@" \
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--run "$dump_cmd" | 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 [[ -z ${TMPDIR+x} ]]; then
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local tmp_backup=$TMPDIR
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fi
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log_status eval "$cache"
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eval < "$cache"
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export PATH=$PATH:$path_backup TERM=$term_backup TMPDIR=$tmp_backup
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if [ -z ${tmp_backup+x} ]; then
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export TMPDIR=${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 [[ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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unset SSL_CERT_FILE
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fi
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if [[ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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unset NIX_SSL_CERT_FILE
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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" ]] && (( $update_drv )); then
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local drv_link=".direnv/drv"
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local drv="$(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 "$PWD/$drv_link" "/nix/var/nix/gcroots/per-user/$LOGNAME/$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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