mirror of
https://github.com/nix-community/nix-direnv.git
synced 2025-11-08 19:46:11 +01:00
314 lines
9 KiB
Text
314 lines
9 KiB
Text
# shellcheck shell=bash
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REQUIRED_DIRENV_VERSION="2.21.3"
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if ! has direnv_version || ! direnv_version "$REQUIRED_DIRENV_VERSION" 2>/dev/null; then
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printf '%s\n' "nix-direnv: base direnv version is older than the required v$REQUIRED_DIRENV_VERSION." >&2
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exit 1
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fi
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# Usage: nix_direnv_version <version_at_least>
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#
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# Checks that the nix-direnv version is at least as old as <version_at_least>.
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nix_direnv_version() {
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declare major='1' minor='6' patch='1' # UPDATE(nix-direnv version)
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[[ $1 =~ ^([^+-.]*)(\.?)([^+-.]*)(\.?)([^+-]*)(-?)([^+]*)(\+?)(.*)$ ]]
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declare -a ver; ver=("${BASH_REMATCH[@]:1}")
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if [[ ( ${ver[0]} != +([0-9]) ) \
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|| ( ${ver[1]} == '.' && ${ver[2]} != +([0-9]) ) \
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|| ( ${ver[3]} == '.' && ${ver[4]} != +([0-9]) ) \
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|| ( ${ver[5]} == '-' && ${ver[6]} != +([0-9A-Za-z-])*(.+([0-9A-Za-z-])) ) \
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|| ( ${ver[7]} == '+' && ${ver[8]} != +([0-9A-Za-z-])*(.+([0-9A-Za-z-])) ) \
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|| ( ( -n ${ver[5]} || -n ${ver[7]} ) && ( -z ${ver[2]} || -z ${ver[4]} ) ) \
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]]; then
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printf '%s\n' "nix-direnv: error v$1 is not a valid semver version" >&2
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return 1
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fi
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if [[ ( ${ver[0]} -gt $major ) \
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|| ( ${ver[2]:=0} -gt $minor ) \
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|| ( ${ver[4]:=0} -gt $patch ) \
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]]; then
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printf '%s\n' "nix-direnv: error current version v$major.$minor.$patch is older than the desired version v$1" >&2
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return 1
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fi
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}
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if [[ -z ${NIX_BIN_PREFIX:-} ]]; then
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NIX_BIN_PREFIX=$(command -v nix-shell)
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NIX_BIN_PREFIX="${NIX_BIN_PREFIX%/*}/"
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fi
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_nix_export_or_unset() {
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local key=$1 value=$2
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if [[ "$value" == __UNSET__ ]]; then
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unset "$key"
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else
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export "$key=$value"
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fi
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}
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_nix_import_env() {
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local env=$1
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local old_path=${PATH:-}
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local old_term=${TERM:-__UNSET__}
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local old_shell=${SHELL:-__UNSET__}
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local old_tmpdir=${TMPDIR:-__UNSET__}
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local old_ssl_cert_file=${SSL_CERT_FILE:-__UNSET__}
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local old_nix_ssl_cert_file=${NIX_SSL_CERT_FILE:-__UNSET__}
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local old_xdg_data_dirs=${XDG_DATA_DIRS:-}
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eval "$env"
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# `nix-shell --pure` sets invalid ssl certificate paths
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if [[ "${SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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_nix_export_or_unset SSL_CERT_FILE "$old_ssl_cert_file"
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fi
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if [[ "${NIX_SSL_CERT_FILE:-}" = /no-cert-file.crt ]]; then
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_nix_export_or_unset NIX_SSL_CERT_FILE "$old_nix_ssl_cert_file"
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fi
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export PATH=$PATH${old_path:+":"}$old_path
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_nix_export_or_unset TERM "$old_term"
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_nix_export_or_unset SHELL "$old_shell"
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_nix_export_or_unset TMPDIR "$old_tmpdir"
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export XDG_DATA_DIRS=$XDG_DATA_DIRS${old_xdg_data_dirs:+":"}$old_xdg_data_dirs
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# misleading since we are in an impure shell now
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export IN_NIX_SHELL=impure
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}
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_nix_add_gcroot() {
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local storepath=$1
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local symlink=$2
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local stripped_pwd=${2/\//}
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local escaped_pwd=${stripped_pwd//-/--}
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local escaped_pwd=${escaped_pwd//\//-}
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ln -fsn "$storepath" "$symlink"
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ln -fsn "$symlink" "/nix/var/nix/gcroots/per-user/$USER/$escaped_pwd"
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}
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_nix_argsum_suffix() {
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local out checksum
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if [ -n "$1" ]; then
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if has sha1sum; then
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out=$(sha1sum <<< "$1")
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elif has shasum; then
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out=$(shasum <<< "$1")
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else
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# degrate gracefully both tools are not present
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return
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fi
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read -r checksum _ <<< "$out"
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echo "-$checksum"
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fi
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}
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nix_direnv_watch_file() {
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watch_file "$@"
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nix_watches+=("$@")
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}
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use_flake() {
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flake_expr="${1:-.}"
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flake_dir="${flake_expr%#*}"
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nix_direnv_watch_file .envrc
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if [[ -d "$flake_dir" ]]; then
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nix_direnv_watch_file "$flake_dir/"flake.nix
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nix_direnv_watch_file "$flake_dir/"flake.lock
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if [[ -e "$flake_dir/"devshell.toml ]]; then
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nix_direnv_watch_file "$flake_dir/"devshell.toml
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fi
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fi
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local layout_dir profile
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layout_dir=$(direnv_layout_dir)
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profile="${layout_dir}/flake-profile$(_nix_argsum_suffix "$flake_expr")"
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local flake_inputs="${layout_dir}/flake-inputs/"
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local profile_rc="${profile}.rc"
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nix_watches+=(
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"$HOME/".direnvrc
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)
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need_update=0
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for file in "${nix_watches[@]}"; do
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if [[ "$file" -nt "$profile_rc" ]]; then
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need_update=1
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break
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fi
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done
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if [[ ! -e "$profile"
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|| ! -e "$profile_rc"
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|| "$need_update" -eq "1"
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]];
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then
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local tmp_profile="${layout_dir}/flake-profile.$$"
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[[ -d "$layout_dir" ]] || mkdir -p "$layout_dir"
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local tmp_profile_rc
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tmp_profile_rc=$("${NIX_BIN_PREFIX}nix" print-dev-env \
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--extra-experimental-features "nix-command flakes" \
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--profile "$tmp_profile" "$@")
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# macos does not have realpath
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if command -v realpath >/dev/null; then
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drv=$(realpath "$tmp_profile")
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else
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drv=$(perl -e 'use Cwd "abs_path";print abs_path(shift)' "$tmp_profile")
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fi
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echo "$tmp_profile_rc" > "$profile_rc"
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rm -f "$tmp_profile" "$tmp_profile"*
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_nix_add_gcroot "$drv" "$profile"
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# also add garbage collection root for source
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local flake_input_paths
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rm -rf "$flake_inputs"
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mkdir "$flake_inputs"
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flake_input_paths=$("${NIX_BIN_PREFIX}nix" flake archive --json \
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--extra-experimental-features "nix-command flakes" \
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"$flake_dir" | grep -E -o '/nix/store/[^"]+')
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for path in $flake_input_paths; do
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_nix_add_gcroot "$path" "${flake_inputs}/${path##*/}"
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done
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log_status renewed cache
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else
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sed "/eval \"\$shellHook\"/d" "$profile_rc" > "${profile_rc}.tmp"
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mv "${profile_rc}.tmp" "${profile_rc}"
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log_status using cached dev shell
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fi
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local old_nix_build_top=${NIX_BUILD_TOP:-__UNSET__}
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local old_tmp=${TMP:-__UNSET__}
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local old_tmpdir=${TMPDIR:-__UNSET__}
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local old_temp=${TEMP:-__UNSET__}
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local old_tempdir=${TEMPDIR:-__UNSET__}
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local old_xdg_data_dirs=${XDG_DATA_DIRS:-}
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# TODO: maybe use `_nix_import_env()` here: https://github.com/nix-community/nix-direnv/pull/75#issuecomment-803139886
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eval "$(< "$profile_rc")"
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# nix print-env-dev will create a temporary directory and use it a TMPDIR,
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# we cannot rely on this directory beeing not deleted at some point,
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# hence we are just removing it right away.
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if [[ "$NIX_BUILD_TOP" == */nix-shell.* && -d "$NIX_BUILD_TOP" ]]; then
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rmdir "$NIX_BUILD_TOP"
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fi
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_nix_export_or_unset NIX_BUILD_TOP "$old_nix_build_top"
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_nix_export_or_unset TMP "$old_tmp"
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_nix_export_or_unset TMPDIR "$old_tmpdir"
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_nix_export_or_unset TEMP "$old_temp"
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_nix_export_or_unset TEMPDIR "$old_tempdir"
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export XDG_DATA_DIRS=$XDG_DATA_DIRS${old_xdg_data_dirs:+":"}$old_xdg_data_dirs
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}
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_nix_extract_direnv() {
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local found_direnv
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found_direnv=0
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while read -r line; do
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if [[ "$found_direnv" == "1" ]]; then
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echo "$line"
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break
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elif [[ "$line" == "_____direnv_____" ]]; then
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found_direnv=1
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else
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echo "$line" >&2
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fi
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done
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}
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use_nix() {
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local path layout_dir
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path=$("${NIX_BIN_PREFIX}nix-instantiate" --find-file nixpkgs)
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layout_dir=$(direnv_layout_dir)
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local experimental_flags=()
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if "${NIX_BIN_PREFIX}nix-shell" --extra-experimental-features '' --version 2>/dev/null >&2; then
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experimental_flags+=('--extra-experimental-features' 'nix-command flakes')
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fi
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if [[ "${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 "${path}/.version-suffix" ]]; then
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version=$(< "${path}/.version-suffix")
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elif [[ -f "${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" =~ $regex ]]; then
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read -r version < "${path}/.git/${BASH_REMATCH[1]}"
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else
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version="$head"
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fi
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elif [[ -f "${path}/.version" && "${path}" == "/nix/store/"* ]]; then
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# borrow some bits from the store path
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local version_prefix
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read -r version_prefix < "${path}/.version"
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version="${version_prefix}-${path:11:16}"
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fi
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local cache
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cache="${layout_dir}/cache-${version:-unknown}$(_nix_argsum_suffix "$*")"
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nix_watches+=(
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"$HOME/".direnvrc
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.envrc
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default.nix
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shell.nix
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)
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need_update=0
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for file in "${nix_watches[@]}"; do
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if [[ "$file" -nt "$cache" ]]; then
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need_update=1
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break
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fi
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done
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local update_drv=0
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if [[ ! -e "$cache"
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|| "$need_update" -eq "1"
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]];
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then
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[[ -d "$layout_dir" ]] || mkdir -p "$layout_dir"
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local dump_cmd tmp
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dump_cmd="echo _____direnv_____; \"$direnv\" dump bash"
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tmp=$("${NIX_BIN_PREFIX}nix-shell" \
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"${experimental_flags[@]}" \
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--show-trace --pure "$@" --run "$dump_cmd")
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# show original shell hook output
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echo "$tmp" | _nix_extract_direnv >&2 > "$cache"
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update_drv=1
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else
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log_status using cached derivation
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fi
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log_status eval "$cache"
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read -r cache_content < "$cache"
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_nix_import_env "$cache_content"
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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 [[ "${out:-}" != "" ]] && (( update_drv )); then
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local drv_link="${layout_dir}/drv" drv
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drv=$("${NIX_BIN_PREFIX}nix" show-derivation "$out" \
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"${experimental_flags[@]}" \
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| grep -E -o -m1 '/nix/store/.*.drv')
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_nix_add_gcroot "$drv" "$drv_link"
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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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