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doc: mention 'go get golang.org/dl/...' in install

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I needed Go 1.10 to debug and fix a test failure on that Go version in
x/tools, but I forgot what the magic 'go get' command for this was.

Googling "download specific golang version" and similar keywords showed
no results, presumably because the golang.org/dl subrepo isn't
prominently recommended nor documented anywhere.

The most appropriate documentation page to add this to is doc/install,
since it goes into some detail and is well indexed. We only need a short
section to introduce the trick.

The example does mention a specific version, Go 1.10.7, but I couldn't
imagine a way to make it version-agnostic while still being clear on
what the commands effectively do.

Change-Id: I13158564d76d95caec412cdb35a50a4356df5863
Reviewed-on: https://go-review.googlesource.com/c/157457
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Daniel Martí 2019-01-10 23:42:53 +00:00
parent cd06b2d00d
commit 4edea0f0a7
1 changed files with 33 additions and 0 deletions
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@ -271,6 +271,39 @@ which describes some essential concepts about using the Go tools.
</p>
<h2 id="extra_versions">Installing extra Go versions</h2>
<p>
It may be useful to have multiple Go versions installed on the same machine, for
example, to ensure that a package's tests pass on multiple Go versions.
Once you have one Go version installed, you can install another (such as 1.10.7)
as follows:
</p>
<pre>
$ go get golang.org/dl/go1.10.7
$ go1.10.7 download
</pre>
<p>
The newly downloaded version can be used like <code>go</code>:
</p>
<pre>
$ go1.10.7 version
go version go1.10.7 linux/amd64
</pre>
<p>
All Go versions available via this method are listed on
<a href="https://godoc.org/golang.org/dl#pkg-subdirectories">the download page</a>.
You can find where each of these extra Go versions is installed by looking
at its <code>GOROOT</code>; for example, <code>go1.10.7 env GOROOT</code>.
To uninstall a downloaded version, just remove its <code>GOROOT</code> directory
and the <code>goX.Y.Z</code> binary.
</p>
<h2 id="uninstall">Uninstalling Go</h2>
<p>