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improve performance by reducing subshells

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forking is somewhat slow
This commit is contained in:
Jörg Thalheim 2019-10-18 12:53:44 +00:00
parent ea257f1130
commit 292d43a005
1 changed files with 16 additions and 12 deletions
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28
direnvrc
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@ -1,15 +1,17 @@
use_nix() {
local path="$(nix-instantiate --find-file nixpkgs)"
if [ -f "${path}/.version-suffix" ]; then
local version="$(< $path/.version-suffix)"
elif [ -f "${path}/.git/HEAD" ]; then
local head=$(< ${path}/.git/HEAD)
local version
if [[ -f "${path}/.version-suffix" ]]; then
read version < "${path}/.version-suffix"
elif [[ -f "${path}/.git/HEAD" ]]; then
local head
read head < "${path}/.git/HEAD"
local regex="ref: (.*)"
if [[ "$head" =~ $regex ]]; then
local version=$(< ".git/${BASH_REMATCH[1]}")
read version < ".git/${BASH_REMATCH[1]}"
else
local version="$head"
version="$head"
fi
fi
@ -22,7 +24,7 @@ use_nix() {
[[ default.nix -nt "$cache" ]] || \
[[ shell.nix -nt "$cache" ]];
then
[ -d .direnv ] || mkdir .direnv
[[ -d .direnv ]] || mkdir .direnv
local dump_cmd="echo -n _____direnv_____; \"$direnv\" dump bash"
local tmp=$(nix-shell --show-trace --pure "$@" \
--run "$dump_cmd" | grep -oP '(?<=_____direnv_____).*')
@ -32,12 +34,14 @@ use_nix() {
log_status using cached derivation
fi
local term_backup=$TERM path_backup=$PATH
if [ -z ${TMPDIR+x} ]; then
if [[ -z ${TMPDIR+x} ]]; then
local tmp_backup=$TMPDIR
fi
log_status eval $cache
eval "$(< $cache)"
local cache_content
read cache_content < "$cache"
eval "$cache_content"
export PATH=$PATH:$path_backup TERM=$term_backup TMPDIR=$tmp_backup
if [ -z ${tmp_backup+x} ]; then
export TMPDIR=${tmp_backup}
@ -46,15 +50,15 @@ use_nix() {
fi
# `nix-shell --pure` sets invalid ssl certificate paths
if [ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]; then
if [[ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
unset SSL_CERT_FILE
fi
if [ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]; then
if [[ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
unset NIX_SSL_CERT_FILE
fi
# This part is based on https://discourse.nixos.org/t/what-is-the-best-dev-workflow-around-nix-shell/418/4
if [ "$out" ] && (( $update_drv )); then
if [[ "$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/\//}