fix: use python instead gzip+chmod (#59)

BUILD.bazel

@@ -15,6 +15,7 @@ filegroup(
         "//tools/tests-runner:all_files",
         "//tools/tests-placeholder-repairer:all_files",
         "//tools/protoc-gen-elm:all_files",
+        "//tools/gzip:all_files",
     ],
     visibility = ["//visibility:public"],
 )

elm/repositories.bzl

@@ -66,7 +66,10 @@ genrule(
     name = "extract_elm_compiler",
     srcs = [":compiler.gz"],
     outs = [ "compiler" ],
-    cmd = "gzip -d -c $(SRCS) > $@ && chmod +x $@"
+    tools = [
+      "@rules_elm//tools/gzip:bin",
+    ],
+    cmd = "$(execpath @rules_elm//tools/gzip:bin) $(SRCS) $@",
 )
 
 elm_toolchain(

examples/BUILD.bazel

@@ -24,7 +24,7 @@ rules_elm_integration_test_each_bazel(
     bazel_binaries = bazel_binaries,
     workspace_path = "elm-binary",
     bazel_cmd = "build :main",
-    expected_output = "INFO: Build completed successfully, (8|7) total actions",
+    expected_output = "INFO: Build completed successfully, .. total actions",
     # sometimes it fails with an error:
     # 0.19.1/d.dat: openBinaryFile: resource busy (file is locked)
     flaky = True,
@@ -60,7 +60,7 @@ rules_elm_integration_test_each_bazel(
     test_runner = ":output_match_runner",
     workspace_path = "elm-todomvc",
     bazel_cmd = "build :bin",
-    expected_output = """INFO: Build completed successfully, (7|8) total actions""",
+    expected_output = """INFO: Build completed successfully, .. total actions""",
 )
 
 rules_elm_integration_test_each_bazel(

tools/gzip/BUILD.bazel

@@ -0,0 +1,14 @@
+load("@rules_python//python:defs.bzl", "py_binary")
+
+py_binary(
+    name = "bin",
+    main = ":gzip.py",
+    srcs = ["gzip.py"],
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "all_files",
+    srcs = glob(["*"]),
+    visibility = ["//:__subpackages__"],
+)

tools/gzip/gzip.py

@@ -0,0 +1,15 @@
+import sys
+import os
+import gzip
+
+(
+    compressed_filepath,
+    decompressed_filepath,
+) = sys.argv[1:3]
+
+with open(decompressed_filepath, "xb") as decompressed:
+    with gzip.open(compressed_filepath, 'rb') as compressed:
+        decompressed.write(compressed.read())
+
+os.chmod(decompressed_filepath, 0o555)
+