run 'uv' directly via run_shell

Author: aignas

python/uv/private/lock.bzl

@@ -73,22 +73,13 @@ def _lock_impl(ctx):
 
     py_runtime = ctx.toolchains[TARGET_TOOLCHAIN_TYPE].py3_runtime
 
-    cmd = ctx.actions.declare_file(ctx.label.name + ".exe")
-    ctx.actions.expand_template(
-        template = ctx.files._template[0],
-        substitutions = {
-            '"{{args}}"': "",
-            "{{bazel_out}}": output.path,
-            "{{src_out}}": existing_output[0].path,
-            "{{uv}}": uv.path,
-        },
-        output = cmd,
-        is_executable = True,
-    )
-
     run_args = []
     lock_args = ctx.actions.args()
 
+    lock_args.add(uv)
+    lock_args.add("pip")
+    lock_args.add("compile")
+
     def _add_args(arg, maybe_value = None):
         run_args.append(arg)
         if maybe_value:
@@ -120,17 +111,37 @@ def _lock_impl(ctx):
         lock_args.add("--python", py_runtime.interpreter_path)
     lock_args.add_all(args)
     lock_args.add_all(srcs)
-
-    ctx.actions.run(
-        executable = cmd,
-        mnemonic = "PyRequirementsLockUv",
-        inputs = srcs + ctx.files.existing_output,
-        outputs = [output],
-        arguments = [lock_args],
-        tools = [cmd],
-        progress_message = "Creating a requirements.txt with uv: //{}:{}".format(ctx.label.package, ctx.label.name),
-        env = ctx.attr.env,
-    )
+    lock_args.add("--output-file", output)
+
+    progress_message = "Creating a requirements.txt with uv: //{}:{}".format(ctx.label.package, ctx.label.name)
+    if existing_output:
+        ctx.actions.run_shell(
+            command = "cp {src} {dst} && \"$@\"".format(
+                src = existing_output.path,
+                dst = output.path,
+            ),
+            mnemonic = "PyRequirementsLockUv",
+            inputs = srcs + ctx.files.existing_output,
+            outputs = [output],
+            arguments = [lock_args],
+            tools = [uv],
+            progress_message = progress_message,
+            env = ctx.attr.env,
+        )
+    else:
+        ctx.actions.run_shell(
+            command = "\"$@\"".format(
+                src = ctx.files.existing_output[0].path,
+                dst = output.path,
+            ),
+            mnemonic = "PyRequirementsLockUv",
+            inputs = srcs,
+            outputs = [output],
+            arguments = [lock_args],
+            tools = [uv],
+            progress_message = progress_message,
+            env = ctx.attr.env,
+        )
 
     return [
         DefaultInfo(files = depset([output])),