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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
ARM string
}
func PlatformFromString(os, arch string) Platform {
if strings.HasPrefix(arch, "armv") && len(arch) >= 5 {
return Platform{
OS: os,
Arch: "arm",
ARM: arch[4:],
}
}
return Platform{
OS: os,
Arch: arch,
}
}
func (p *Platform) String() string {
return fmt.Sprintf("%s/%s", p.OS, p.GetArch())
}
func (p *Platform) GetArch() string {
return fmt.Sprintf("%s%s", p.Arch, p.GetARMVersion())
}
func (p *Platform) GetARMVersion() string {
if len(p.ARM) > 0 {
return "v" + p.ARM
}
return ""
}
// 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{
{OS: "darwin", Arch: "386", Default: true},
{OS: "darwin", Arch: "amd64", Default: true},
{OS: "linux", Arch: "386", Default: true},
{OS: "linux", Arch: "amd64", Default: true},
{OS: "linux", Arch: "arm", Default: true},
{OS: "linux", Arch: "arm", Default: true, ARM: "5"},
{OS: "linux", Arch: "arm", Default: true, ARM: "6"},
{OS: "linux", Arch: "arm", Default: true, ARM: "7"},
{OS: "freebsd", Arch: "386", Default: true},
{OS: "freebsd", Arch: "amd64", Default: true},
{OS: "openbsd", Arch: "386", Default: true},
{OS: "openbsd", Arch: "amd64", Default: true},
{OS: "windows", Arch: "386", Default: true},
{OS: "windows", Arch: "amd64", Default: true},
}
Platforms_1_1 = addDrop(Platforms_1_0, []Platform{
{OS: "freebsd", Arch: "arm", Default: true},
{OS: "freebsd", Arch: "arm", Default: true, ARM: "5"},
{OS: "freebsd", Arch: "arm", Default: true, ARM: "6"},
{OS: "freebsd", Arch: "arm", Default: true, ARM: "7"},
{OS: "netbsd", Arch: "386", Default: true},
{OS: "netbsd", Arch: "amd64", Default: true},
{OS: "netbsd", Arch: "arm", Default: true},
{OS: "plan9", Arch: "386", Default: false},
}, nil)
Platforms_1_3 = addDrop(Platforms_1_1, []Platform{
{OS: "dragonfly", Arch: "386", Default: false},
{OS: "dragonfly", Arch: "amd64", Default: false},
{OS: "nacl", Arch: "amd64", Default: false},
{OS: "nacl", Arch: "amd64p32", Default: false},
{OS: "nacl", Arch: "arm", Default: false},
{OS: "nacl", Arch: "arm", Default: false, ARM: "5"},
{OS: "nacl", Arch: "arm", Default: false, ARM: "6"},
{OS: "nacl", Arch: "arm", Default: false, ARM: "7"},
{OS: "solaris", Arch: "amd64", Default: false},
}, nil)
Platforms_1_4 = addDrop(Platforms_1_3, []Platform{
{OS: "android", Arch: "arm", Default: false},
{OS: "android", Arch: "arm", Default: false, ARM: "5"},
{OS: "android", Arch: "arm", Default: false, ARM: "6"},
{OS: "android", Arch: "arm", Default: false, ARM: "7"},
{OS: "plan9", Arch: "amd64", Default: false},
}, nil)
Platforms_1_5 = addDrop(Platforms_1_4, []Platform{
{OS: "darwin", Arch: "arm", Default: false},
{OS: "darwin", Arch: "arm", Default: false, ARM: "5"},
{OS: "darwin", Arch: "arm", Default: false, ARM: "6"},
{OS: "darwin", Arch: "arm", Default: false, ARM: "7"},
{OS: "darwin", Arch: "arm64", Default: false},
{OS: "linux", Arch: "arm64", Default: false},
{OS: "linux", Arch: "ppc64", Default: false},
{OS: "linux", Arch: "ppc64le", Default: false},
}, nil)
Platforms_1_6 = addDrop(Platforms_1_5, []Platform{
{OS: "android", Arch: "386", Default: false},
{OS: "android", Arch: "amd64", Default: false},
{OS: "linux", Arch: "mips64", Default: false},
{OS: "linux", Arch: "mips64le", Default: false},
{OS: "nacl", Arch: "386", Default: false},
{OS: "openbsd", Arch: "arm", Default: true},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "5"},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "6"},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "7"},
}, nil)
Platforms_1_7 = addDrop(Platforms_1_5, []Platform{
// While not fully supported s390x is generally useful
{OS: "linux", Arch: "s390x", Default: true},
{OS: "plan9", Arch: "arm", Default: false},
{OS: "plan9", Arch: "arm", Default: false, ARM: "5"},
{OS: "plan9", Arch: "arm", Default: false, ARM: "6"},
{OS: "plan9", Arch: "arm", Default: false, ARM: "7"},
// Add the 1.6 Platforms, but reflect full support for mips64 and mips64le
{OS: "android", Arch: "386", Default: false},
{OS: "android", Arch: "amd64", Default: false},
{OS: "linux", Arch: "mips64", Default: true},
{OS: "linux", Arch: "mips64le", Default: true},
{OS: "nacl", Arch: "386", Default: false},
{OS: "openbsd", Arch: "arm", Default: true},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "5"},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "6"},
{OS: "openbsd", Arch: "arm", Default: true, ARM: "7"},
}, nil)
Platforms_1_8 = addDrop(Platforms_1_7, []Platform{
{OS: "linux", Arch: "mips", Default: true},
{OS: "linux", Arch: "mipsle", Default: 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{{OS: "android", Arch: "amd64", Default: false}})
Platforms_1_11 = addDrop(Platforms_1_10, []Platform{
{OS: "js", Arch: "wasm", Default: true},
}, nil)
Platforms_1_12 = addDrop(Platforms_1_11, []Platform{
{OS: "aix", Arch: "ppc64", Default: false},
{OS: "windows", Arch: "arm", Default: true},
{OS: "windows", Arch: "arm", Default: true, ARM: "5"},
{OS: "windows", Arch: "arm", Default: true, ARM: "6"},
{OS: "windows", Arch: "arm", Default: true, ARM: "7"},
}, nil)
Platforms_1_13 = addDrop(Platforms_1_12, []Platform{
{OS: "illumos", Arch: "amd64", Default: false},
{OS: "netbsd", Arch: "arm64", Default: true},
{OS: "openbsd", Arch: "arm64", Default: true},
}, nil)
Platforms_1_14 = addDrop(Platforms_1_13, []Platform{
{OS: "freebsd", Arch: "arm64", Default: true},
{OS: "linux", Arch: "riscv64", Default: true},
}, []Platform{
// drop nacl
{OS: "nacl", Arch: "386", Default: false},
{OS: "nacl", Arch: "amd64", Default: false},
{OS: "nacl", Arch: "arm", Default: false},
{OS: "nacl", Arch: "arm", Default: false, ARM: "5"},
{OS: "nacl", Arch: "arm", Default: false, ARM: "6"},
{OS: "nacl", Arch: "arm", Default: false, ARM: "7"},
})
Platforms_1_15 = addDrop(Platforms_1_14, []Platform{
{OS: "android", Arch: "arm64", Default: false},
}, []Platform{
// drop i386 macos
{OS: "darwin", Arch: "386", Default: false},
})
Platforms_1_16 = addDrop(Platforms_1_15, []Platform{
{OS: "android", Arch: "amd64", Default: false},
{OS: "darwin", Arch: "arm64", Default: true},
{OS: "openbsd", Arch: "mips64", Default: false},
}, nil)
Platforms_1_17 = addDrop(Platforms_1_16, []Platform{
{OS: "windows", Arch: "arm64", Default: 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
}