linux_container.go

package util

import (
	"os"
	"path/filepath"
	"strings"
)

func ToLinuxContainerPath(path string) string {
	return filepath.ToSlash(
		strings.TrimPrefix(
			path,
			filepath.VolumeName(path),
		),
	)
}

func IsInContainer() bool {
	werfContainerized := GetBoolEnvironment("WERF_CONTAINERIZED")
	if werfContainerized != nil {
		return *werfContainerized
	}

	// Docker-daemon
	if isInContainer, err := RegularFileExists("/.dockerenv"); err == nil && isInContainer {
		return true
	}

	// Podman, CRI-O
	if isInContainer, err := RegularFileExists("/run/.containerenv"); err == nil && isInContainer {
		return true
	}

	cgroupsData, err := os.ReadFile("/proc/1/cgroup")
	if err != nil {
		return false
	}

	// containerd without Docker-daemon
	if strings.Contains(string(cgroupsData), "/cri-containerd-") ||
		strings.Contains(string(cgroupsData), "/containerd") {
		return true
	}

	// If in Kubernetes
	if strings.Contains(string(cgroupsData), "/kubepods") {
		return true
	}

	return false
}