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| #################################### | ||
| # Environment setup for Nix shells # | ||
| #################################### | ||
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| # From https://github.com/direnv/direnv/wiki/Nix#persistent-cached-shell | ||
| # | ||
| # Usage: use_nix [...] | ||
| # | ||
| # Load environment variables from `nix-shell`. | ||
| # If you have a `default.nix` or `shell.nix` one of these will be used and | ||
| # the derived environment will be stored at ./.direnv/env-<hash> | ||
| # and symlink to it will be created at ./.direnv/default. | ||
| # Dependencies are added to the GC roots, such that the environment remains persistent. | ||
| # | ||
| # Packages can also be specified directly via e.g `use nix -p ocaml`, | ||
| # however those will not be added to the GC roots. | ||
| # | ||
| # The resulting environment is cached for better performance. | ||
| # | ||
| # To trigger switch to a different environment: | ||
| # `rm -f .direnv/default` | ||
| # | ||
| # To derive a new environment: | ||
| # `rm -rf .direnv/env-$(md5sum {shell,default}.nix 2> /dev/null | cut -c -32)` | ||
| # | ||
| # To remove cache: | ||
| # `rm -f .direnv/dump-*` | ||
| # | ||
| # To remove all environments: | ||
| # `rm -rf .direnv/env-*` | ||
| # | ||
| # To remove only old environments: | ||
| # `find .direnv -name 'env-*' -and -not -name `readlink .direnv/default` -exec rm -rf {} +` | ||
| # | ||
| use_nix() { | ||
| set -e | ||
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| local shell="shell.nix" | ||
| if [[ ! -f "${shell}" ]]; then | ||
| shell="default.nix" | ||
| fi | ||
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| if [[ ! -f "${shell}" ]]; then | ||
| fail "use nix: shell.nix or default.nix not found in the folder" | ||
| fi | ||
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| local dir="${PWD}"/.direnv | ||
| local default="${dir}/default" | ||
| if [[ ! -L "${default}" ]] || [[ ! -d `readlink "${default}"` ]]; then | ||
| local wd="${dir}/env-`md5sum "${shell}" | cut -c -32`" # TODO: Hash also the nixpkgs version? | ||
| mkdir -p "${wd}" | ||
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| local drv="${wd}/env.drv" | ||
| if [[ ! -f "${drv}" ]]; then | ||
| 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 | ||
| fi | ||
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| rm -f "${default}" | ||
| ln -s `basename "${wd}"` "${default}" | ||
| fi | ||
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| local drv=`readlink -f "${default}/env.drv"` | ||
| local dump="${dir}/dump-`md5sum ".envrc" | cut -c -32`-`md5sum ${drv} | cut -c -32`" | ||
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| if [[ ! -f "${dump}" ]] || [[ "${XDG_CONFIG_DIR}/direnv/direnvrc" -nt "${dump}" ]]; then | ||
| log_status "use nix: updating cache" | ||
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| old=`find "${dir}" -name 'dump-*'` | ||
| nix-shell "${drv}" --show-trace "$@" --run 'direnv dump' > "${dump}" | ||
| rm -f ${old} | ||
| fi | ||
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| direnv_load cat "${dump}" | ||
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| watch_file "${default}" | ||
| watch_file shell.nix | ||
| if [[ ${shell} == "default.nix" ]]; then | ||
| watch_file default.nix | ||
| fi | ||
| } | ||
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| use nix |
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