mirror of https://github.com/k3s-io/k3s.git
113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
//go:build !windows
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// +build !windows
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package rootless
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import (
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"fmt"
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"os"
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"os/user"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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)
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func setupMounts(stateDir string) error {
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// Remove symlinks to the rootful files, so that we can create our own files.
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removeList := []string{
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"/var/run/netns",
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"/run/containerd",
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"/run/xtables.lock",
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}
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for _, f := range removeList {
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_ = os.RemoveAll(f)
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}
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runDir, err := resolveRunDir()
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if err != nil {
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return err
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}
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mountMap := [][]string{
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{"/var/log", filepath.Join(stateDir, "logs")},
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{"/var/lib/cni", filepath.Join(stateDir, "cni")},
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{"/var/lib/kubelet", filepath.Join(stateDir, "kubelet")},
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{"/etc/rancher", filepath.Join(stateDir, "etc", "rancher")},
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{"/run/k3s/containerd", filepath.Join(runDir, "k3s", "containerd")},
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}
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for _, v := range mountMap {
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if err := setupMount(v[0], v[1]); err != nil {
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return errors.Wrapf(err, "failed to setup mount %s => %s", v[0], v[1])
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}
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}
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if devKmsg, err := os.Open("/dev/kmsg"); err == nil {
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devKmsg.Close()
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} else {
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// kubelet requires /dev/kmsg to be readable
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// https://github.com/rootless-containers/usernetes/issues/204
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// https://github.com/rootless-containers/usernetes/pull/214
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logrus.Debugf("`kernel.dmesg_restrict` seems to be set, bind-mounting /dev/null into /dev/kmsg")
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if err := unix.Mount("/dev/null", "/dev/kmsg", "none", unix.MS_BIND, ""); err != nil {
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return err
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}
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}
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return nil
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}
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func setupMount(target, dir string) error {
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toCreate := target
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for {
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if toCreate == "/" {
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return fmt.Errorf("missing /%s on the root filesystem", strings.Split(target, "/")[0])
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}
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if err := os.MkdirAll(toCreate, 0700); err == nil {
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break
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}
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toCreate = filepath.Base(toCreate)
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}
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if err := os.MkdirAll(toCreate, 0700); err != nil {
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return errors.Wrapf(err, "failed to create directory %s", toCreate)
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}
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logrus.Debug("Mounting none ", toCreate, " tmpfs")
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if err := unix.Mount("none", toCreate, "tmpfs", 0, ""); err != nil {
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return errors.Wrapf(err, "failed to mount tmpfs to %s", toCreate)
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}
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if err := os.MkdirAll(target, 0700); err != nil {
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return errors.Wrapf(err, "failed to create directory %s", target)
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}
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if dir == "" {
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return nil
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}
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if err := os.MkdirAll(dir, 0700); err != nil {
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return errors.Wrapf(err, "failed to create directory %s", dir)
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}
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logrus.Debug("Mounting ", dir, target, " none bind")
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return unix.Mount(dir, target, "none", unix.MS_BIND, "")
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}
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func resolveRunDir() (string, error) {
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runDir := os.Getenv("XDG_RUNTIME_DIR")
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if runDir == "" {
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u, err := user.Lookup(os.Getenv("USER"))
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if err != nil {
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return "", err
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}
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runDir = filepath.Join("/run/user", u.Uid)
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}
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return runDir, nil
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}
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