1# `tools/ci/pkg/go`
2
3This package parses diffs in `.bzl` files defining `go_repository` rules to determine what Go modules have changed for a build and ensure our code dependent on those modules is rebuilt.
4
5## What determines a change
6
7There must be a changed `sum` field, as indicated by a pair of lines starting with a corresponding `-` and `+`:
8
9```
10 go_repository(
11 name = "com_github_pmezard_go_difflib",
12@@ -1258,8 +1258,8 @@ def go():
13 build_file_generation = "on",
14 build_file_proto_mode = "disable_global",
15 importpath = "gopkg.in/yaml.v3",
16- sum = "h1:B0J02caTR6tpSJozBJyiAzT6CtBzjclw4pgm9gg8Ys0=",
17- version = "v3.0.0-20190905181640-827449938966",
18+ sum = "h1:XZx7nhd5GMaZpmDaEHFVafUZC7ya0fuo7cSJ3UCKYmM=",
19+ version = "v3.0.0-20191120175047-4206685974f2",
20 )
21```
22
23New `go_repository` rules will be excluded from this because they any new modules brought in via `go_repository` rules should also correspond to new `import` statements in Go code that would be picked up already.
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