third_party/gazelle/add-prepatching.patch

Copyright 2020 The Monogon Project Authors.

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From db55421f284253c06561a4df18bca262999962ce Mon Sep 17 00:00:00 2001
From: Lorenz Brun <lorenz@nexantic.com>
Date: Wed, 22 Jul 2020 09:46:56 +0200
Subject: [PATCH] Add support for prepatching

---
 internal/go_repository.bzl | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/internal/go_repository.bzl b/internal/go_repository.bzl
index 51a7317..86899bd 100644
--- a/internal/go_repository.bzl
+++ b/internal/go_repository.bzl
@@ -127,6 +127,8 @@ def _go_repository_impl(ctx):
         if result.stderr:
             print("fetch_repo: " + result.stderr)
 
+    patch(ctx, True)
+
     # Repositories are fetched. Determine if build file generation is needed.
     build_file_names = ctx.attr.build_file_name.split(",")
     existing_build_file = ""
@@ -160,7 +162,7 @@ def _go_repository_impl(ctx):
             "-repo_root",
             ctx.path(""),
             "-repo_config",
-            ctx.path(ctx.attr.build_config)
+            ctx.path(ctx.attr.build_config),
         ]
         if ctx.attr.version:
             cmd.append("-go_repository_module_mode")
@@ -247,9 +249,13 @@ go_repository = repository_rule(
             ],
         ),
         "build_extra_args": attr.string_list(),
-        "build_config": attr.label(default= "@bazel_gazelle_go_repository_config//:WORKSPACE"),
+        "build_config": attr.label(default = "@bazel_gazelle_go_repository_config//:WORKSPACE"),
         "build_directives": attr.string_list(default = []),
 
+        # Patches to apply before running gazelle.
+        "pre_patches": attr.label_list(),
+        "pre_patch_cmds": attr.string_list(default = []),
+
         # Patches to apply after running gazelle.
         "patches": attr.label_list(),
         "patch_tool": attr.string(default = "patch"),
@@ -260,10 +266,11 @@ go_repository = repository_rule(
 """See repository.rst#go-repository for full documentation."""
 
 # Copied from @bazel_tools//tools/build_defs/repo:utils.bzl
-def patch(ctx):
+def patch(ctx, pre_mode = False):
     """Implementation of patching an already extracted repository"""
     bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
-    for patchfile in ctx.attr.patches:
+    patches = ctx.attr.patches if not pre_mode else ctx.attr.pre_patches
+    for patchfile in patches:
         command = "{patchtool} {patch_args} < {patchfile}".format(
             patchtool = ctx.attr.patch_tool,
             patchfile = ctx.path(patchfile),
@@ -276,7 +283,8 @@ def patch(ctx):
         if st.return_code:
             fail("Error applying patch %s:\n%s%s" %
                  (str(patchfile), st.stderr, st.stdout))
-    for cmd in ctx.attr.patch_cmds:
+    patch_cmds = ctx.attr.patch_cmds if not pre_mode else ctx.attr.pre_patch_cmds
+    for cmd in patch_cmds:
         st = ctx.execute([bash_exe, "-c", cmd])
         if st.return_code:
             fail("Error applying patch command %s:\n%s%s" %
-- 
2.25.1