Read only the first juliapkg.json for each package on sys.path

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## Unreleased
+* Read only the first `juliapkg.json` for each package found on `sys.path`, matching import.
+
 ## v0.1.27 (2026-09-19)
 * Add `bindir()` function.
 

src/juliapkg/deps.py

@@ -300,7 +300,8 @@ def deps_files():
     ans = []
     # the default deps file
     ans.append(cur_deps_file())
-    # look in sys.path
+    # look in sys.path, keeping only the first copy of each package, as import does
+    seen = set()
     for path in sys.path:
         if not path:
             path = os.getcwd()
@@ -310,7 +311,9 @@ def deps_files():
         ans.append(fn)
         for subdir in os.listdir(path):
             fn = os.path.join(path, subdir, "juliapkg.json")
-            ans.append(fn)
+            if subdir not in seen and os.path.isfile(fn):
+                seen.add(subdir)
+                ans.append(fn)
 
     ans += editable_deps_files()
 

test/test_all.py

@@ -188,3 +188,25 @@ def test_editable_setuptools():
     )
     assert os.path.exists(fn)
     assert any(os.path.samefile(fn, x) for x in juliapkg.deps.deps_files())
+
+
+def test_deps_files_skips_shadowed_package(monkeypatch):
+    # a package found twice on sys.path contributes only the copy import uses
+    with (
+        tempfile.TemporaryDirectory() as first,
+        tempfile.TemporaryDirectory() as second,
+    ):
+        for root in (first, second):
+            os.mkdir(os.path.join(root, "shadowedpkg"))
+            with open(os.path.join(root, "shadowedpkg", "juliapkg.json"), "w") as fp:
+                json.dump({"packages": {}}, fp)
+        monkeypatch.setattr("sys.path", [first, second])
+        files = juliapkg.deps.deps_files()
+        assert any(
+            os.path.samefile(os.path.join(first, "shadowedpkg", "juliapkg.json"), x)
+            for x in files
+        )
+        assert not any(
+            os.path.samefile(os.path.join(second, "shadowedpkg", "juliapkg.json"), x)
+            for x in files
+        )