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Bryan Bennett 2023-12-21 08:51:20 -05:00
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# The below code is taken largely from nix-direnv.
# nix-direnv's license is replicated below:
#
# Copyright (c) 2019 Nix community projects
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
_nix_export_or_unset() {
local key=$1 value=$2
if [[ $value == __UNSET__ ]]; then
unset "$key"
else
export "$key=$value"
fi
}
use_flake_env() {
local old_nix_build_top=${NIX_BUILD_TOP:-__UNSET__}
local old_tmp=${TMP:-__UNSET__}
local old_tmpdir=${TMPDIR:-__UNSET__}
local old_temp=${TEMP:-__UNSET__}
local old_tempdir=${TEMPDIR:-__UNSET__}
local old_xdg_data_dirs=${XDG_DATA_DIRS:-}
local ld=$(direnv_layout_dir)
eval $(flake_env "$1" "$ld")
# `nix print-dev-env` will create a temporary directory and use it as TMPDIR
# We cannot rely on this directory being available at all times,
# as it may be garbage collected.
# Instead - just remove it immediately.
# Use recursive & force as it may not be empty.
if [[ -n ${NIX_BUILD_TOP+x} && $NIX_BUILD_TOP == */nix-shell.* && -d $NIX_BUILD_TOP ]]; then
rm -rf "$NIX_BUILD_TOP"
fi
_nix_export_or_unset NIX_BUILD_TOP "$old_nix_build_top"
_nix_export_or_unset TMP "$old_tmp"
_nix_export_or_unset TMPDIR "$old_tmpdir"
_nix_export_or_unset TEMP "$old_temp"
_nix_export_or_unset TEMPDIR "$old_tempdir"
local new_xdg_data_dirs=${XDG_DATA_DIRS:-}
export XDG_DATA_DIRS=
local IFS=:
for dir in $new_xdg_data_dirs${old_xdg_data_dirs:+:}$old_xdg_data_dirs; do
dir="${dir%/}" # remove trailing slashes
if [[ :$XDG_DATA_DIRS: == *:$dir:* ]]; then
continue # already present, skip
fi
XDG_DATA_DIRS="$XDG_DATA_DIRS${XDG_DATA_DIRS:+:}$dir"
done
}