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Austin Clements 4c31dfe850 cmd/go: introduce Shell abstraction
This CL separates running shell commands and doing shell-like
operations out of the Builder type and into their own, new Shell type.
Shell is responsible for tracking output streams and the Action that's
running commands. Shells form a tree somewhat like Context, where new
Shells can be derived from a root shell to adjust their state.

The primary intent is to support "go build -json", where we need to
flow the current package ID down to the lowest level of command output
printing. Shell gives us a way to easily flow that context down.

However, this also puts a clear boundary around how we run commands,
removing this from the rather large Builder abstraction.

For #62067.

Change-Id: Ia9ab2a2d7cac0269ca627bbb316dbd9610bcda44
Reviewed-on: https://go-review.googlesource.com/c/go/+/535016
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Austin Clements <austin@google.com>
2023-10-19 19:09:38 +00:00
.github .github: issue template for telemetry proposals 2023-09-14 21:29:10 +00:00
api io: add (*SectionReader).Outer() 2023-10-09 22:04:41 +00:00
doc spec: explain eval order of binary operator examples with comments 2023-10-17 15:06:48 +00:00
lib/time lib/time: update to 2023c/2023c 2023-05-03 20:14:11 +00:00
misc os: add tests for UserCacheDir and UserConfigDir 2023-08-21 17:46:57 +00:00
src cmd/go: introduce Shell abstraction 2023-10-19 19:09:38 +00:00
test cmd/compile: report mismatched version set by //go:build 2023-10-19 11:56:10 +00:00
.gitattributes
.gitignore internal/platform,cmd/dist: export the list of supported platforms 2023-06-22 19:44:52 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00
LICENSE
PATENTS
README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md SECURITY.md: update the Reporting a Vulnerability link 2023-09-22 21:17:24 +00:00

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