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package cgroups
import (
"bytes"
"os"
"strings"
"sync"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
// OpenFile opens a cgroup file in a given dir with given flags.
// It is supposed to be used for cgroup files only.
func OpenFile(dir, file string, flags int) (*os.File, error) {
if dir == "" {
return nil, errors.Errorf("no directory specified for %s", file)
}
return openFile(dir, file, flags)
}
// ReadFile reads data from a cgroup file in dir.
// It is supposed to be used for cgroup files only.
func ReadFile(dir, file string) (string, error) {
fd, err := OpenFile(dir, file, unix.O_RDONLY)
if err != nil {
return "", err
}
defer fd.Close()
var buf bytes.Buffer
_, err = buf.ReadFrom(fd)
return buf.String(), err
}
// WriteFile writes data to a cgroup file in dir.
// It is supposed to be used for cgroup files only.
func WriteFile(dir, file, data string) error {
fd, err := OpenFile(dir, file, unix.O_WRONLY)
if err != nil {
return err
}
defer fd.Close()
if err := retryingWriteFile(fd, data); err != nil {
return errors.Wrapf(err, "failed to write %q", data)
}
return nil
}
func retryingWriteFile(fd *os.File, data string) error {
for {
_, err := fd.Write([]byte(data))
if errors.Is(err, unix.EINTR) {
logrus.Infof("interrupted while writing %s to %s", data, fd.Name())
continue
}
return err
}
}
const (
cgroupfsDir = "/sys/fs/cgroup"
cgroupfsPrefix = cgroupfsDir + "/"
)
var (
// TestMode is set to true by unit tests that need "fake" cgroupfs.
TestMode bool
cgroupFd int = -1
prepOnce sync.Once
prepErr error
resolveFlags uint64
)
func prepareOpenat2() error {
prepOnce.Do(func() {
fd, err := unix.Openat2(-1, cgroupfsDir, &unix.OpenHow{
Flags: unix.O_DIRECTORY | unix.O_PATH,
})
if err != nil {
prepErr = &os.PathError{Op: "openat2", Path: cgroupfsDir, Err: err}
if err != unix.ENOSYS {
logrus.Warnf("falling back to securejoin: %s", prepErr)
} else {
logrus.Debug("openat2 not available, falling back to securejoin")
}
return
}
var st unix.Statfs_t
if err = unix.Fstatfs(fd, &st); err != nil {
prepErr = &os.PathError{Op: "statfs", Path: cgroupfsDir, Err: err}
logrus.Warnf("falling back to securejoin: %s", prepErr)
return
}
cgroupFd = fd
resolveFlags = unix.RESOLVE_BENEATH | unix.RESOLVE_NO_MAGICLINKS
if st.Type == unix.CGROUP2_SUPER_MAGIC {
// cgroupv2 has a single mountpoint and no "cpu,cpuacct" symlinks
resolveFlags |= unix.RESOLVE_NO_XDEV | unix.RESOLVE_NO_SYMLINKS
}
})
return prepErr
}
// OpenFile opens a cgroup file in a given dir with given flags.
// It is supposed to be used for cgroup files only.
func openFile(dir, file string, flags int) (*os.File, error) {
mode := os.FileMode(0)
if TestMode && flags&os.O_WRONLY != 0 {
// "emulate" cgroup fs for unit tests
flags |= os.O_TRUNC | os.O_CREATE
mode = 0o600
}
if prepareOpenat2() != nil {
return openFallback(dir, file, flags, mode)
}
reldir := strings.TrimPrefix(dir, cgroupfsPrefix)
if len(reldir) == len(dir) { // non-standard path, old system?
return openFallback(dir, file, flags, mode)
}
relname := reldir + "/" + file
fd, err := unix.Openat2(cgroupFd, relname,
&unix.OpenHow{
Resolve: resolveFlags,
Flags: uint64(flags) | unix.O_CLOEXEC,
Mode: uint64(mode),
})
if err != nil {
return nil, &os.PathError{Op: "openat2", Path: dir + "/" + file, Err: err}
}
return os.NewFile(uintptr(fd), cgroupfsPrefix+relname), nil
}
var errNotCgroupfs = errors.New("not a cgroup file")
// openFallback is used when openat2(2) is not available. It checks the opened
// file is on cgroupfs, returning an error otherwise.
func openFallback(dir, file string, flags int, mode os.FileMode) (*os.File, error) {
path := dir + "/" + file
fd, err := os.OpenFile(path, flags, mode)
if err != nil {
return nil, err
}
if TestMode {
return fd, nil
}
// Check this is a cgroupfs file.
var st unix.Statfs_t
if err := unix.Fstatfs(int(fd.Fd()), &st); err != nil {
_ = fd.Close()
return nil, &os.PathError{Op: "statfs", Path: path, Err: err}
}
if st.Type != unix.CGROUP_SUPER_MAGIC && st.Type != unix.CGROUP2_SUPER_MAGIC {
_ = fd.Close()
return nil, &os.PathError{Op: "open", Path: path, Err: errNotCgroupfs}
}
return fd, nil
}
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