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https://github.com/opencontainers/runc.git
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36aefad45d
Errors returned by unix are bare. In some cases it's impossible to find out what went wrong because there's is not enough context. Add a mountError type (mostly copy-pasted from github.com/moby/sys/mount), and mount/unmount helpers. Use these where appropriate, and convert error checks to use errors.Is. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
42 lines
921 B
Go
42 lines
921 B
Go
package libcontainer
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import (
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"os"
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"golang.org/x/sys/unix"
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)
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// mount initializes the console inside the rootfs mounting with the specified mount label
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// and applying the correct ownership of the console.
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func mountConsole(slavePath string) error {
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oldMask := unix.Umask(0o000)
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defer unix.Umask(oldMask)
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f, err := os.Create("/dev/console")
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if err != nil && !os.IsExist(err) {
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return err
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}
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if f != nil {
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f.Close()
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}
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return mount(slavePath, "/dev/console", "", "bind", unix.MS_BIND, "")
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}
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// dupStdio opens the slavePath for the console and dups the fds to the current
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// processes stdio, fd 0,1,2.
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func dupStdio(slavePath string) error {
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fd, err := unix.Open(slavePath, unix.O_RDWR, 0)
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if err != nil {
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return &os.PathError{
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Op: "open",
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Path: slavePath,
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Err: err,
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}
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}
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for _, i := range []int{0, 1, 2} {
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if err := unix.Dup3(fd, i, 0); 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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