102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
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package container
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import (
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"os/exec"
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"runtime"
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"strconv"
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"strings"
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)
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// ContainerRuntime describes the preferred isolated workload runtime for CoreGUI.
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//
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// runtime := container.Detect()
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// if runtime == container.RuntimeApple { /* prefer Apple Containers */ }
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type ContainerRuntime string
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const (
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RuntimeNone ContainerRuntime = ""
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RuntimeApple ContainerRuntime = "apple"
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RuntimeDocker ContainerRuntime = "docker"
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RuntimePodman ContainerRuntime = "podman"
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)
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// DetectEnvironment controls runtime detection for tests and other callers.
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//
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// runtime := container.DetectWithEnvironment(container.DetectEnvironment{
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// GOOS: "darwin",
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// ProductVersion: "26.0",
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// })
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type DetectEnvironment struct {
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GOOS string
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ProductVersion string
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LookPath func(file string) (string, error)
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}
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// Detect prefers Apple Containers on macOS 26+, then Docker, then Podman.
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//
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// runtime := container.Detect()
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func Detect() ContainerRuntime {
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environment := DetectEnvironment{
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GOOS: runtime.GOOS,
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ProductVersion: "",
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LookPath: exec.LookPath,
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}
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if runtime.GOOS == "darwin" {
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environment.ProductVersion = productVersion()
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}
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return DetectWithEnvironment(environment)
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}
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// DetectWithEnvironment applies the RFC runtime ordering using an explicit environment.
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//
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// runtime := container.DetectWithEnvironment(env)
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func DetectWithEnvironment(environment DetectEnvironment) ContainerRuntime {
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lookPath := environment.LookPath
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if lookPath == nil {
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lookPath = exec.LookPath
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}
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goos := strings.ToLower(strings.TrimSpace(environment.GOOS))
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if goos == "darwin" && majorVersion(environment.ProductVersion) >= 26 {
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if hasBinary(lookPath, "container") || hasBinary(lookPath, "apple-container") || hasBinary(lookPath, "containerctl") {
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return RuntimeApple
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}
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}
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if hasBinary(lookPath, "docker") {
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return RuntimeDocker
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}
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if hasBinary(lookPath, "podman") {
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return RuntimePodman
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}
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return RuntimeNone
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}
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func hasBinary(lookPath func(string) (string, error), binary string) bool {
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if strings.TrimSpace(binary) == "" {
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return false
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}
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_, err := lookPath(binary)
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return err == nil
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}
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func majorVersion(productVersion string) int {
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productVersion = strings.TrimSpace(productVersion)
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if productVersion == "" {
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return 0
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}
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major, _, _ := strings.Cut(productVersion, ".")
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value, err := strconv.Atoi(major)
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if err != nil {
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return 0
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}
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return value
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}
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func productVersion() string {
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output, err := exec.Command("sw_vers", "-productVersion").Output()
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if err != nil {
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return ""
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}
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return strings.TrimSpace(string(output))
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}
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