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Russ Cox 35268a9960 cmd/go: additional doc-inspired tests and bug fixes
Additional tests and bug fixes realized while writing go.dev/doc/gotoolchain (CL 500775).

- Handle go get toolchain@go1.22 (resolve to latest patch release, same as go get go@1.22).
  (See modload/query.go and gover/mod.go.)

- Handle go get go@patch toolchain@patch.
  (See modload/query.go and gover/mod.go.)

- Remove prefix-goVERSION-suffix form for toolchain name,
  standardizing on goVERSION-suffix.
  I have no good explanation for having two forms, so simplify to one.
  (See vendor and gover.)

- Fail toolchain downloads when GOSUMDB=off.
  Because toolchain downloads cannot always be predicted
  (especially during switching rather than selection),
  they cannot be listed in go.sum.
  We rely on the checksum database for integrity of the download,
  especially if proxied. If the checksum database is disabled,
  this integrity check won't happen, so fail toolchain downloads.
  (See modfetch/sumdb.go and script/gotoolchain_net.txt)

- Use names from documentation in package toolchain
  (Select, Switch; SwitchTo renamed to Exec to avoid both names;
  reqs.go renamed to switch.go; toolchain.go renamed to select.go.)

- Make "go env GOTOOLCHAIN" and "go env -w GOTOOLCHAIN"
  work even when GOTOOLCHAIN is misconfigured.
  (See special case at top of Select in select.go.)

- Clarify what goInstallVersion does
  (report whether this is go install or go run pkg@version)
  and explain the potential version switch more clearly.
  Use the Switcher directly instead of reimplementing it.
  (See select.go.)

- Document go@ and toolchain@ forms in go help get,
  linking to go.dev/doc/toolchain.
  (See modget/get.go.)

- Update URL of documentation in $GOROOT/go.env.

For #57001.

Change-Id: I895ef3519ff95db8710ed23b36ebaf4f648120cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/500797
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Bypass: Russ Cox <rsc@golang.org>
2023-06-06 19:18:46 +00:00
.github doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
api math/big: rename Int.ToFloat64 to Float64 2023-06-02 14:22:24 +00:00
doc doc/go1.21: document GOEXPERIMENT=loopvar and invite feedback 2023-06-05 19:18:13 +00:00
lib/time lib/time: update to 2023c/2023c 2023-05-03 20:14:11 +00:00
misc misc/wasm: set PATH variable in exec 2023-05-26 17:21:14 +00:00
src cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00
test cmd/compile: allow ir.OMIN/ir.OMAX in mayCall 2023-06-05 03:11:36 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore cmd/dist: refactor generated cgo-support logic 2023-04-20 17:26:46 +00:00
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +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: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00

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