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# We use a simple Go program to report many Go versions.
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# The program also errors on any command other than "go version",
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# which saves us having to rebuild main.go many times.
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go build -o .bin/go$exe ./fakego
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env PATH=${WORK}/.bin${:}${PATH}
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# An empty go version.
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env GO_VERSION=''
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! garble build
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stderr 'Can''t get Go version'
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# We should error on a devel version that's too old.
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env GO_VERSION='go version devel +afb5fca Sun Aug 07 00:00:00 2020 +0000 linux/amd64'
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! garble build
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stderr 'Go version.*Aug 07.*too old; please upgrade to Go 1.16.x or a newer devel version'
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# A future devel timestamp should be fine.
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env GO_VERSION='go version devel +afb5fca Sun Sep 13 07:54:42 2021 +0000 linux/amd64'
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! garble build
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stderr 'mocking the real build'
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# We should error on a stable version that's too old.
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env GO_VERSION='go version go1.14 windows/amd64'
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! garble build
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stderr 'Go version.*go1.14.*too old; please upgrade to Go 1.16.x'
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! stderr 'or a newer devel version'
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# We should accept a future stable version.
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env GO_VERSION='go version go1.16.2 windows/amd64'
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! garble build
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stderr 'mocking the real build'
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CI: pin a commit when testing against Go tip
Since it changes rapidly, especially during merge cycles, and we don't
want CI to surprisingly blow up in our faces from one day to another.
Pin this to a commit from yesterday which works, since some changes
merged today moved where the Go build version is recorded and broke
garble.
While at it, replace "git clone" with a wget of a source archive. This
is much, much faster, mainly because a tarball is significantly smaller.
We now download about 20MiB instead of over 350MiB.
One downside is that, without git, make.bash can't construct a devel
version on its own. For that reason, add a pretty basic manual version
via the VERSION file.
This means that we must not reject custom devel version strings. This is
a good thing anyway, because custom devel strings are already common
when building Go in custom ways. Those people tend to be advanced users,
such as CI, so fall back to assuming they know what they are doing and
don't error.
Plus, starting last week, devel versions in Go master now contain the
major Go version like in build tags, such as "go1.17-commit...", so we
will soon start relying on that instead of parsing dates:
$ go version
go version devel go1.17-a7e16abb22 Thu Apr 8 07:33:58 2021 +0000 linux/amd64
3 years ago
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# We should accept custom devel strings.
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|
env GO_VERSION='go version devel somecustomversion linux/amd64'
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|
! garble build
|
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stderr 'mocking the real build'
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-- go.mod --
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module test/main
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go 1.16
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-- main.go --
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package main
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func main() {}
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-- fakego/main.go --
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package main
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import (
|
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|
"fmt"
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"os"
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)
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func main() {
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if len(os.Args) > 0 && os.Args[1] == "version" {
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|
fmt.Println(os.Getenv("GO_VERSION"))
|
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|
return
|
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|
}
|
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fmt.Fprintln(os.Stderr, "mocking the real build")
|
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|
os.Exit(1)
|
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|
|
}
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