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nix: support single-checkout and multi-workspace direnv setups

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The current `.envrc` unconditionally runs `use flake`, which breaks multi-workspace
jj setups where workspace subdirectories each have their own `.envrc`. Entering a
workspace unloads the root's nix env even when the workspace `.envrc` is blocked,
because direnv always unloads the parent env on any `.envrc` transition.

`source_up_if_exists` re-runs the parent `.envrc` and inherits its nix env in a
multi-workspace setup (fast due to caching). The `IN_NIX_SHELL` guard then skips
`use flake path:.`, which only runs in a plain single checkout where no parent
`.envrc` exists and `IN_NIX_SHELL` is unset.
This commit is contained in:
Amaan Qureshi 2026-02-17 22:48:23 -05:00
parent 957ee4e634
commit 792bba8dab
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1 changed files with 4 additions and 1 deletions
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5
.envrc
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@ -1 +1,4 @@
use flake
source_up_if_exists
if [ -z "${IN_NIX_SHELL:-}" ]; then
use flake .
fi