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platform.go
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platform.go
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package main
import (
"fmt"
"log"
"strings"
version "github.com/hashicorp/go-version"
)
// Platform is a combination of OS/arch that can be built against.
type Platform struct {
OS string
Arch string
// Default, if true, will be included as a default build target
// if no OS/arch is specified. We try to only set as a default popular
// targets or targets that are generally useful. For example, Android
// is not a default because it is quite rare that you're cross-compiling
// something to Android AND something like Linux.
Default bool
}
func (p *Platform) String() string {
return fmt.Sprintf("%s/%s", p.OS, p.Arch)
}
// addDrop appends all of the "add" entries and drops the "drop" entries, ignoring
// the "Default" parameter.
func addDrop(base []Platform, add []Platform, drop []Platform) []Platform {
newPlatforms := make([]Platform, len(base)+len(add))
copy(newPlatforms, base)
copy(newPlatforms[len(base):], add)
// slow, but we only do this during initialization at most once per version
for _, platform := range drop {
found := -1
for i := range newPlatforms {
if newPlatforms[i].Arch == platform.Arch && newPlatforms[i].OS == platform.OS {
found = i
break
}
}
if found < 0 {
panic(fmt.Sprintf("Expected to remove %+v but not found in list %+v", platform, newPlatforms))
}
if found == len(newPlatforms)-1 {
newPlatforms = newPlatforms[:found]
} else if found == 0 {
newPlatforms = newPlatforms[found:]
} else {
newPlatforms = append(newPlatforms[:found], newPlatforms[found+1:]...)
}
}
return newPlatforms
}
var (
Platforms_1_0 = []Platform{
{"darwin", "386", true},
{"darwin", "amd64", true},
{"linux", "386", true},
{"linux", "amd64", true},
{"linux", "arm", true},
{"freebsd", "386", true},
{"freebsd", "amd64", true},
{"openbsd", "386", true},
{"openbsd", "amd64", true},
{"windows", "386", true},
{"windows", "amd64", true},
}
Platforms_1_1 = addDrop(Platforms_1_0, []Platform{
{"freebsd", "arm", true},
{"netbsd", "386", true},
{"netbsd", "amd64", true},
{"netbsd", "arm", true},
{"plan9", "386", false},
}, nil)
Platforms_1_3 = addDrop(Platforms_1_1, []Platform{
{"dragonfly", "386", false},
{"dragonfly", "amd64", false},
{"nacl", "amd64", false},
{"nacl", "amd64p32", false},
{"nacl", "arm", false},
{"solaris", "amd64", false},
}, nil)
Platforms_1_4 = addDrop(Platforms_1_3, []Platform{
{"android", "arm", false},
{"plan9", "amd64", false},
}, nil)
Platforms_1_5 = addDrop(Platforms_1_4, []Platform{
{"darwin", "arm", false},
{"darwin", "arm64", false},
{"linux", "arm64", false},
{"linux", "ppc64", false},
{"linux", "ppc64le", false},
}, nil)
Platforms_1_6 = addDrop(Platforms_1_5, []Platform{
{"android", "386", false},
{"android", "amd64", false},
{"linux", "mips64", false},
{"linux", "mips64le", false},
{"nacl", "386", false},
{"openbsd", "arm", true},
}, nil)
Platforms_1_7 = addDrop(Platforms_1_5, []Platform{
// While not fully supported s390x is generally useful
{"linux", "s390x", true},
{"plan9", "arm", false},
// Add the 1.6 Platforms, but reflect full support for mips64 and mips64le
{"android", "386", false},
{"android", "amd64", false},
{"linux", "mips64", true},
{"linux", "mips64le", true},
{"nacl", "386", false},
{"openbsd", "arm", true},
}, nil)
Platforms_1_8 = addDrop(Platforms_1_7, []Platform{
{"linux", "mips", true},
{"linux", "mipsle", true},
}, nil)
// no new platforms in 1.9
Platforms_1_9 = Platforms_1_8
// unannounced, but dropped support for android/amd64
Platforms_1_10 = addDrop(Platforms_1_9, nil, []Platform{{"android", "amd64", false}})
Platforms_1_11 = addDrop(Platforms_1_10, []Platform{
{"js", "wasm", true},
}, nil)
Platforms_1_12 = addDrop(Platforms_1_11, []Platform{
{"aix", "ppc64", false},
{"windows", "arm", true},
}, nil)
Platforms_1_13 = addDrop(Platforms_1_12, []Platform{
{"illumos", "amd64", false},
{"netbsd", "arm64", true},
{"openbsd", "arm64", true},
}, nil)
Platforms_1_14 = addDrop(Platforms_1_13, []Platform{
{"freebsd", "arm64", true},
{"linux", "riscv64", true},
}, []Platform{
// drop nacl
{"nacl", "386", false},
{"nacl", "amd64", false},
{"nacl", "arm", false},
})
Platforms_1_15 = addDrop(Platforms_1_14, []Platform{
{"android", "arm64", false},
}, []Platform{
// drop i386 macos
{"darwin", "386", false},
})
Platforms_1_16 = addDrop(Platforms_1_15, []Platform{
{"android", "amd64", false},
{"darwin", "arm64", true},
{"openbsd", "mips64", false},
}, nil)
Platforms_1_17 = addDrop(Platforms_1_16, []Platform{
{"windows", "arm64", true},
}, nil)
// no new platforms in 1.18
Platforms_1_18 = Platforms_1_17
PlatformsLatest = Platforms_1_18
)
// SupportedPlatforms returns the full list of supported platforms for
// the version of Go that is
func SupportedPlatforms(v string) []Platform {
// Use latest if we get an unexpected version string
if !strings.HasPrefix(v, "go") {
return PlatformsLatest
}
// go-version only cares about version numbers
v = v[2:]
current, err := version.NewVersion(v)
if err != nil {
log.Printf("Unable to parse current go version: %s\n%s", v, err.Error())
// Default to latest
return PlatformsLatest
}
var platforms = []struct {
constraint string
plat []Platform
}{
{"<= 1.0", Platforms_1_0},
{">= 1.1, < 1.3", Platforms_1_1},
{">= 1.3, < 1.4", Platforms_1_3},
{">= 1.4, < 1.5", Platforms_1_4},
{">= 1.5, < 1.6", Platforms_1_5},
{">= 1.6, < 1.7", Platforms_1_6},
{">= 1.7, < 1.8", Platforms_1_7},
{">= 1.8, < 1.9", Platforms_1_8},
{">= 1.9, < 1.10", Platforms_1_9},
{">= 1.10, < 1.11", Platforms_1_10},
{">= 1.11, < 1.12", Platforms_1_11},
{">= 1.12, < 1.13", Platforms_1_12},
{">= 1.13, < 1.14", Platforms_1_13},
{">= 1.14, < 1.15", Platforms_1_14},
{">= 1.15, < 1.16", Platforms_1_15},
{">= 1.16, < 1.17", Platforms_1_16},
{">= 1.17, < 1.18", Platforms_1_17},
{">= 1.18, < 1.19", Platforms_1_18},
}
for _, p := range platforms {
constraints, err := version.NewConstraint(p.constraint)
if err != nil {
panic(err)
}
if constraints.Check(current) {
return p.plat
}
}
// Assume latest
return PlatformsLatest
}