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use flake: allow optional flake expression

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This allows using flake.nix out of tree, which is very appreciable
if you develop in a big repository as flake evaluation will copy the
whole git archive to store everytime it changes.
This commit is contained in:
Dominique Martinet 2021-05-26 13:44:26 +09:00
parent 1134713112
commit fd12ba39f3
2 changed files with 14 additions and 6 deletions
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6
README.md
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@ -185,6 +185,12 @@ $ echo "use flake" >> .envrc
$ direnv allow
```
Optionally if you do not want flake.nix to be part of the current directory repo,
you can specify an arbitrary flake expression as parameter such as:
```console
use flake ~/myflakes#project
```
## Storing .direnv outside the project directory
A `.direnv` directory will be created in each `use_nix` project, which might

14
direnvrc
View file

@ -87,8 +87,10 @@ _nix_add_gcroot() {
}
use_flake() {
watch_file flake.nix
watch_file flake.lock
flake_expr="${1:-.}"
flake_dir="${flake_expr%#*}"
watch_file "$flake_dir/"flake.nix
watch_file "$flake_dir/"flake.lock
local layout_dir
layout_dir=$(direnv_layout_dir)
@ -100,8 +102,8 @@ use_flake() {
|| ! -e "$profile_rc"
|| "$HOME/.direnvrc" -nt "$profile_rc"
|| .envrc -nt "$profile_rc"
|| flake.nix -nt "$profile_rc"
|| flake.lock -nt "$profile_rc"
|| "$flake_dir/"flake.nix -nt "$profile_rc"
|| "$flake_dir/"flake.lock -nt "$profile_rc"
]];
then
local tmp_profile="${layout_dir}/flake-profile.$$"
@ -109,7 +111,7 @@ use_flake() {
local tmp_profile_rc
tmp_profile_rc=$("${NIX_BIN_PREFIX}nix" print-dev-env \
--extra-experimental-features "nix-command flakes" \
--profile "$tmp_profile")
--profile "$tmp_profile" "$flake_expr")
# macos does not have realpath
if command -v realpath >/dev/null; then
drv=$(realpath "$tmp_profile")
@ -126,7 +128,7 @@ use_flake() {
mkdir "$flake_inputs"
flake_input_paths=$("${NIX_BIN_PREFIX}nix" flake archive --json \
--extra-experimental-features "nix-command flakes" \
| grep -E -o '/nix/store/[^"]+')
"$flake_dir" | grep -E -o '/nix/store/[^"]+')
for path in $flake_input_paths; do
_nix_add_gcroot "$path" "${flake_inputs}/${path##*/}"
done