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Support flake in a subdir of src #90

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Support flake in a subdir of src #90

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7f5e675
fix(nix): support flake in a subdir
deemp Jan 7, 2026
02acb08
fix(nix): explain the role of 'root'
deemp Jan 17, 2026
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24 changes: 16 additions & 8 deletions default.nix
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Original file line number Diff line number Diff line change
@@ -1,19 +1,22 @@
# Compatibility function to allow flakes to be used by
# non-flake-enabled Nix versions. Given a source tree containing a
# 'flake.nix' and 'flake.lock' file, it fetches the flake inputs and
# calls the flake's 'outputs' function. It then returns an attrset
# containing 'defaultNix' (to be used in 'default.nix'), 'shellNix'
# (to be used in 'shell.nix').
# Compatibility function to allow flakes to be used by non-flake-enabled Nix
# versions. Given a source tree ('src') containing a 'flake.nix' and
# 'flake.lock' files in '${src}/${root}/', it fetches the flake inputs and calls
# the flake's 'outputs' function. It then returns an attrset containing
# 'defaultNix' (to be used in 'default.nix'), 'shellNix' (to be used in
# 'shell.nix').

{
src,
root ? "/",
system ? builtins.currentSystem or "unknown-system",
}:

let
inherit (builtins) mapAttrs;

lockFilePath = src + "/flake.lock";
root' = "/" + root + "/";

lockFilePath = src + root' + "/flake.lock";

lockFile = builtins.fromJSON (builtins.readFile lockFilePath);

Expand Down Expand Up @@ -167,7 +170,12 @@ let
lastModified = 0;
lastModifiedDate = formatSecondsSinceEpoch 0;
}
// (if src ? outPath then src else tryFetchGit src);
// (
let
src' = (if src ? outPath then src else tryFetchGit src);
in
src' // { outPath = src'.outPath + root'; }
);

# Format number of seconds in the Unix epoch as %Y%m%d%H%M%S.
formatSecondsSinceEpoch =
Expand Down