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platforms.go
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platforms.go
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// Package platforms determines file names and extensions based on the current operating system.
package platforms
import (
"fmt"
"log"
"runtime"
"github.com/bazelbuild/bazelisk/versions"
semver "github.com/hashicorp/go-version"
)
type platform struct {
Name string
HasArm64Binary bool
}
var supportedPlatforms = map[string]*platform{
"darwin": {
Name: "macos",
HasArm64Binary: true,
},
"linux": {
Name: "centos7",
HasArm64Binary: false,
},
"windows": {
Name: "windows",
HasArm64Binary: true,
},
}
// GetPlatform returns a Bazel CI-compatible platform identifier for the current operating system.
// TODO(fweikert): raise an error for unsupported platforms
func GetPlatform() (string, error) {
platform := supportedPlatforms[runtime.GOOS]
arch := runtime.GOARCH
if arch == "arm64" {
if platform.HasArm64Binary {
return platform.Name + "_arm64", nil
}
return "", fmt.Errorf("arm64 %s is unsupported", runtime.GOOS)
}
return platform.Name, nil
}
// DetermineExecutableFilenameSuffix returns the extension for binaries on the current operating system.
func DetermineExecutableFilenameSuffix() string {
filenameSuffix := ""
if runtime.GOOS == "windows" {
filenameSuffix = ".exe"
}
return filenameSuffix
}
// DetermineBazelFilename returns the correct file name of a local Bazel binary.
func DetermineBazelFilename(version string, includeSuffix bool) (string, error) {
var machineName string
switch runtime.GOARCH {
case "amd64":
machineName = "x86_64"
case "arm64":
machineName = "arm64"
default:
return "", fmt.Errorf("unsupported machine architecture \"%s\", must be arm64 or x86_64", runtime.GOARCH)
}
var osName string
switch runtime.GOOS {
case "darwin", "linux", "windows":
osName = runtime.GOOS
default:
return "", fmt.Errorf("unsupported operating system \"%s\", must be Linux, macOS or Windows", runtime.GOOS)
}
if osName == "darwin" {
machineName = DarwinFallback(machineName, version)
}
var filenameSuffix string
if includeSuffix {
filenameSuffix = DetermineExecutableFilenameSuffix()
}
return fmt.Sprintf("bazel-%s-%s-%s%s", version, osName, machineName, filenameSuffix), nil
}
// DarwinFallback Darwin arm64 was supported since 4.1.0, before 4.1.0, fall back to x86_64
func DarwinFallback(machineName string, version string) (alterMachineName string) {
// Do not use fallback for commits since they are likely newer than Bazel 4.1
if versions.IsCommit(version) {
return machineName
}
v, err := semver.NewVersion(version)
if err != nil {
return machineName
}
armSupportVer, _ := semver.NewVersion("4.1.0")
if machineName == "arm64" && v.LessThan(armSupportVer) {
log.Printf("WARN: Fallback to x86_64 because arm64 is not supported on Apple Silicon until 4.1.0")
return "x86_64"
}
return machineName
}