Control when uv venv --seed is used

src/pickley/__init__.py

@@ -240,14 +240,16 @@ def resolve(self, settings: "TrackedSettings"):
             venv.logger = self.logger
             venv.create_venv()
             bake_time = runez.to_int(CFG.get_value("bake_time", package_name=canonical_name))
+            env = None
             if bake_time:
                 # uv allows to exclude newer packages, but pip does not
                 # This can fail if project is new (bake time did not elapse yet since project release)
                 LOG.debug("Applying bake_time of %s", runez.represented_duration(bake_time))
                 ago = time.strftime("%Y-%m-%d %H:%M:%SZ", time.gmtime(time.time() - bake_time))
-                os.environ["UV_EXCLUDE_NEWER"] = ago
+                env = dict(os.environ)
+                env["UV_EXCLUDE_NEWER"] = ago
 
-            r = venv.pip_install(pip_spec, no_deps=True, quiet=True, fatal=False)
+            r = venv.pip_install(pip_spec, no_deps=True, quiet=True, fatal=False, env=env)
             if r.failed:
                 lines = r.full_output.strip().splitlines()
                 if lines:

src/pickley/package.py

@@ -50,7 +50,9 @@ def create_venv(self):
     def create_venv_with_uv(self):
         uv_path = CFG.uv_bootstrap.uv_path
         seed = "--seed" if self.settings.uv_seed else None
-        r = runez.run(uv_path, "-q", "venv", seed, "-p", self.settings.python_executable, self.folder, logger=self.logger)
+        env = dict(os.environ)
+        env.pop("UV_VENV_SEED", None)  # We explicitly state `--seed` if/when needed
+        r = runez.run(uv_path, "-q", "venv", seed, "-p", self.settings.python_executable, self.folder, logger=self.logger, env=env)
         if self.groom_uv_venv:
             venv_python = self.folder / "bin/python"
             if venv_python.is_symlink():
@@ -74,7 +76,7 @@ def create_venv_with_pip(self):
         runez.run(self.settings.python_executable, "-mvenv", self.folder, logger=self.logger)
         return self._run_py_pip("install", "-U", *bstrap.pip_auto_upgrade())
 
-    def pip_install(self, *args, fatal=True, no_deps=False, quiet=None):
+    def pip_install(self, *args, fatal=True, no_deps=False, quiet=None, env=None):
         """`pip install` into target venv`"""
         cmd = list(self._auto_quiet_args("install", no_deps and "--no-deps", quiet=quiet))
         if quiet is True:
@@ -84,9 +86,9 @@ def pip_install(self, *args, fatal=True, no_deps=False, quiet=None):
             passthrough = quiet is False or "-q" not in cmd
 
         if self.use_pip:
-            return self._run_py_pip(*cmd, *args, fatal=fatal, passthrough=passthrough)
+            return self._run_py_pip(*cmd, *args, fatal=fatal, passthrough=passthrough, env=env)
 
-        return self._run_uv(*cmd, *args, fatal=fatal, passthrough=passthrough)
+        return self._run_uv(*cmd, *args, fatal=fatal, passthrough=passthrough, env=env)
 
     def run_pip(self, command, *args, **kwargs):
         """Run `pip` command, this only works for commands that are common between `pip` and `uv`"""

tests/test_describe.py

@@ -3,7 +3,8 @@
 import runez
 
 
-def test_describe(cli):
+def test_describe(cli, monkeypatch):
+    monkeypatch.setenv("UV_VENV_SEED", "1")
     cli.run("describe pickley==1.0")
     assert cli.succeeded
     assert "pickley: version 1.0 (pinned)\n" in cli.logged.stdout