Set environment variables for .attrs.json & .attrs.sh

This way no derivation has to expect that these files are in the `cwd`
during the build. This is problematic for `nix-shell` where these files
would have to be inserted into the nix-shell's `cwd` which can become
problematic with e.g. recursive `nix-shell`.

To remain backwards-compatible, the location inside the build sandbox
will be kept, however using these files directly should be deprecated
from now on.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index 9bb6f276c..e6b552b94 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -1093,8 +1093,10 @@ void LocalDerivationGoal::writeStructuredAttrs()
 
         writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
         chownToBuilder(tmpDir + "/.attrs.sh");
+        env["ATTRS_SH_FILE"] = tmpDir + "/.attrs.sh";
         writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
         chownToBuilder(tmpDir + "/.attrs.json");
+        env["ATTRS_JSON_FILE"] = tmpDir + "/.attrs.json";
     }
 }