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0c5333a4f6
This was originally added in #4770 to support structured attrs in
`nix-shell` & `nix develop`: the issue was that it was somewhat awkward
to just write those files into a project directory, especially since
it'd break in case of multiple `nix-shell` invocations from the same
directory. Now the files are written to another, temporary
location when using `nix-shell`/`nix develop` and the correct path is
referenced by NIX_ATTRS_*_FILE.
In `nixpkgs`, it's now common to use these environment variables,
however we still fall back to checking to `.attrs.sh` & `.attrs.json`
since the minimum Nix version we support is 2.3.17[1] which doesn't have
this change.
This however makes implementing structured attrs support more
complicated than needed[2] and in fact we have a few places where the
check for `.attrs.sh`/`.attrs.json` isn't made, so these only break with
Nix 2.3[3].
The idea is now to
* get this into 2.3.18
* bump minver once again to 2.3.18 in nixpkgs
* remove all occurrences of `.attrs.sh`/`.attrs.json` from nixpkgs.
[1] f4bd97b8fa/lib/minver.nix
[2] https://github.com/NixOS/nixpkgs/pull/357053/files#diff-791a01ef89c157eb74d9c87ab8cbc3b81e2cf082cab70b8fec3472cd75ce860dR3-R5
[3] https://github.com/NixOS/nixpkgs/pull/357053#discussion_r1857362490
72 lines
1.4 KiB
Nix
72 lines
1.4 KiB
Nix
with import ./config.nix;
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let
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dep = mkDerivation {
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name = "dep";
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buildCommand = ''
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mkdir $out; echo bla > $out/bla
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'';
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};
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in
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mkDerivation {
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name = "structured";
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__structuredAttrs = true;
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buildCommand = ''
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set -x
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[[ $int = 123456789 ]]
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[[ -z $float ]]
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[[ -n $boolTrue ]]
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[[ -z $boolFalse ]]
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[[ -n ''${hardening[format]} ]]
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[[ -z ''${hardening[fortify]} ]]
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[[ ''${#buildInputs[@]} = 7 ]]
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[[ ''${buildInputs[2]} = c ]]
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[[ -v nothing ]]
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[[ -z $nothing ]]
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mkdir ''${outputs[out]}
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echo bar > $dest
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json=$(cat .attrs.json)
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[[ $json =~ '"narHash":"sha256:1r7yc43zqnzl5b0als5vnyp649gk17i37s7mj00xr8kc47rjcybk"' ]]
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[[ $json =~ '"narSize":288' ]]
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[[ $json =~ '"closureSize":288' ]]
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[[ $json =~ '"references":[]' ]]
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[[ -e "$NIX_ATTRS_SH_FILE" ]]
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[[ -e "$NIX_ATTRS_JSON_FILE" ]]
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[[ "$(<"$NIX_ATTRS_SH_FILE")" = "$(<.attrs.sh)" ]]
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[[ "$(<"$NIX_ATTRS_JSON_FILE")" = "$(<.attrs.json)" ]]
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'';
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buildInputs = [ "a" "b" "c" 123 "'" "\"" null ];
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hardening.format = true;
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hardening.fortify = false;
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outer.inner = [ 1 2 3 ];
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int = 123456789;
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float = 123.456;
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boolTrue = true;
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boolFalse = false;
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nothing = null;
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dest = "${placeholder "out"}/foo";
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"foo bar" = "BAD";
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"1foobar" = "BAD";
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"foo$" = "BAD";
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exportReferencesGraph.refs = [ dep ];
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}
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