ed47d6ba76
The rpc only reports one field, i.e. the cgroup driver, to kubelet. Containerd determines the effective cgroup driver by looking at all runtime handlers, starting from the default runtime handler (the rest in alphabetical order), and returning the cgroup driver setting of the first runtime handler that supports one. If no runtime handler supports cgroup driver (i.e. has a config option for it) containerd falls back to auto-detection, returning systemd if systemd is running and cgroupfs otherwise. This patch implements the CRI server side of Kubernetes KEP-4033: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/4033-group-driver-detection-over-cri Signed-off-by: Markus Lehtonen <markus.lehtonen@intel.com>
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
//go:build !windows
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// +build !windows
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package utils
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import (
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"fmt"
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"os"
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"strconv"
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"golang.org/x/sys/unix"
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)
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// EnsureProcHandle returns whether or not the given file handle is on procfs.
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func EnsureProcHandle(fh *os.File) error {
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var buf unix.Statfs_t
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if err := unix.Fstatfs(int(fh.Fd()), &buf); err != nil {
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return fmt.Errorf("ensure %s is on procfs: %w", fh.Name(), err)
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}
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if buf.Type != unix.PROC_SUPER_MAGIC {
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return fmt.Errorf("%s is not on procfs", fh.Name())
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}
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return nil
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}
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// CloseExecFrom applies O_CLOEXEC to all file descriptors currently open for
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// the process (except for those below the given fd value).
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func CloseExecFrom(minFd int) error {
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fdDir, err := os.Open("/proc/self/fd")
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if err != nil {
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return err
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}
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defer fdDir.Close()
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if err := EnsureProcHandle(fdDir); err != nil {
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return err
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}
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fdList, err := fdDir.Readdirnames(-1)
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if err != nil {
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return err
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}
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for _, fdStr := range fdList {
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fd, err := strconv.Atoi(fdStr)
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// Ignore non-numeric file names.
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if err != nil {
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continue
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}
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// Ignore descriptors lower than our specified minimum.
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if fd < minFd {
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continue
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}
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// Intentionally ignore errors from unix.CloseOnExec -- the cases where
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// this might fail are basically file descriptors that have already
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// been closed (including and especially the one that was created when
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// os.ReadDir did the "opendir" syscall).
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unix.CloseOnExec(fd)
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}
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return nil
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}
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// NewSockPair returns a new unix socket pair
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func NewSockPair(name string) (parent *os.File, child *os.File, err error) {
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fds, err := unix.Socketpair(unix.AF_LOCAL, unix.SOCK_STREAM|unix.SOCK_CLOEXEC, 0)
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if err != nil {
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return nil, nil, err
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}
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return os.NewFile(uintptr(fds[1]), name+"-p"), os.NewFile(uintptr(fds[0]), name+"-c"), nil
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}
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