Verified Commit 91a03cc5 authored by Marc 'risson' Schmitt's avatar Marc 'risson' Schmitt
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# Load environment variables from `nix-shell` and export it out.
#
# Usage: use_nix [-s <nix-expression>] [-w <path>] [-w <path>] ...
# -s nix-expression: The nix expression to use for building the shell environment.
# -w path: watch a file for changes. It can be specified multiple times. The
# shell specified with -s is automatically watched.
#
# If no nix-expression were given with -s, it will attempt to find and load
# the shell using the following files in order: shell.nix and default.nix.
#
# Example:
# - use_nix
# - use_nix -s shell.nix -w .nixpkgs-version.json
#
# The dependencies pulled by nix-shell are added to Nix's garbage collector
# roots, such that the environment remains persistent.
#
# Nix-shell is invoked only once per environment, and the output is cached for
# better performance. If any of the watched files change, then the environment
# is rebuilt.
#
# To remove old environments, and allow the GC to collect their dependencies:
# rm -f .direnv
#
use_nix() {
if ! validate_version; then
echo "This .envrc requires direnv version 2.18.2 or above."
exit 1
fi
# define all local variables
local shell
local files_to_watch=()
local opt OPTARG OPTIND # define vars used by getopts locally
while getopts ":n:s:w:" opt; do
case "${opt}" in
s)
shell="${OPTARG}"
files_to_watch=("${files_to_watch[@]}" "${shell}")
;;
w)
files_to_watch=("${files_to_watch[@]}" "${OPTARG}")
;;
:)
fail "Invalid option: $OPTARG requires an argument"
;;
\?)
fail "Invalid option: $OPTARG"
;;
esac
done
shift $((OPTIND -1))
if [[ -z "${shell}" ]]; then
if [[ -f shell.nix ]]; then
shell=shell.nix
files_to_watch=("${files_to_watch[@]}" shell.nix)
elif [[ -f default.nix ]]; then
shell=default.nix
files_to_watch=("${files_to_watch[@]}" default.nix)
else
fail "ERR: no shell was given"
fi
fi
local f
for f in "${files_to_watch[@]}"; do
if ! [[ -f "${f}" ]]; then
fail "cannot watch file ${f} because it does not exist"
fi
done
# compute the hash of all the files that makes up the development environment
local env_hash="$(hash_contents "${files_to_watch[@]}")"
# define the paths
local dir="$(direnv_layout_dir)"
local wd="${dir}/wd-${env_hash}"
local drv="${wd}/env.drv"
local dump="${wd}/dump.env"
# Generate the environment if we do not have one generated already.
if [[ ! -f "${drv}" ]]; then
mkdir -p "${wd}"
log_status "use nix: deriving new environment"
IN_NIX_SHELL=1 nix-instantiate --add-root "${drv}" --indirect "${shell}" > /dev/null
nix-store -r $(nix-store --query --references "${drv}") --add-root "${wd}/dep" --indirect > /dev/null
if [[ "${?}" -ne 0 ]] || [[ ! -f "${drv}" ]]; then
rm -rf "${wd}"
fail "use nix: was not able to derive the new environment. Please run 'direnv reload' to try again."
fi
log_status "use nix: updating cache"
nix-shell --pure "${drv}" --show-trace --run "$(join_args "$direnv" dump bash)" > "${dump}"
if [[ "${?}" -ne 0 ]] || [[ ! -f "${dump}" ]] || ! grep -q IN_NIX_SHELL "${dump}"; then
rm -rf "${wd}"
fail "use nix: was not able to update the cache of the environment. Please run 'direnv reload' to try again."
fi
fi
# evaluate the dump created by nix-shell earlier, but have to merge the PATH
# with the current PATH
# NOTE: we eval the dump here as opposed to direnv_load it because we don't
# want to persist environment variables coming from the shell at the time of
# the dump. See https://github.com/direnv/direnv/issues/405 for context.
local path_backup="${PATH}"
eval $(cat "${dump}")
export PATH="${PATH}:${path_backup}"
# cleanup the environment of variables that are not requried, or are causing issues.
unset shellHook # when shellHook is present, then any nix-shell'd script will execute it!
# watch all the files we were asked to watch for the environment
for f in "${files_to_watch[@]}"; do
watch_file "${f}"
done
}
fail() {
log_error "${@}"
exit 1
}
hash_contents() {
if has md5sum; then
cat "${@}" | md5sum | cut -c -32
elif has md5; then
cat "${@}" | md5 -q
fi
}
hash_file() {
if has md5sum; then
md5sum "${@}" | cut -c -32
elif has md5; then
md5 -q "${@}"
fi
}
validate_version() {
local version="$("${direnv}" version)"
local major="$(echo "${version}" | cut -d. -f1)"
local minor="$(echo "${version}" | cut -d. -f2)"
local patch="$(echo "${version}" | cut -d. -f3)"
if [[ "${major}" -gt 2 ]]; then return 0; fi
if [[ "${major}" -eq 2 ]] && [[ "${minor}" -gt 18 ]]; then return 0; fi
if [[ "${major}" -eq 2 ]] && [[ "${minor}" -eq 18 ]] && [[ "${patch}" -ge 2 ]]; then return 0; fi
return 1
}
use_nix -s shell.nix
*.qcow2
.direnv/
.pijul/
result
result-bin
secrets
MIT License
Copyright (c) 2019 Marc 'risson' Schmitt
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.
# dotshabka
Shabka configuration files
{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
buildInputs = with pkgs; [
gnumake
];
}
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