mirror of https://gitee.com/openkylin/runc.git
84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
package libcontainer
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import (
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"strconv"
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"golang.org/x/sys/unix"
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)
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// mountError holds an error from a failed mount or unmount operation.
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type mountError struct {
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op string
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source string
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target string
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procfd string
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flags uintptr
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data string
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err error
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}
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// Error provides a string error representation.
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func (e *mountError) Error() string {
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out := e.op + " "
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if e.source != "" {
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out += e.source + ":" + e.target
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} else {
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out += e.target
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}
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if e.procfd != "" {
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out += " (via " + e.procfd + ")"
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}
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if e.flags != uintptr(0) {
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out += ", flags: 0x" + strconv.FormatUint(uint64(e.flags), 16)
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}
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if e.data != "" {
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out += ", data: " + e.data
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}
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out += ": " + e.err.Error()
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return out
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}
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// Unwrap returns the underlying error.
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// This is a convention used by Go 1.13+ standard library.
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func (e *mountError) Unwrap() error {
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return e.err
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}
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// mount is a simple unix.Mount wrapper. If procfd is not empty, it is used
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// instead of target (and the target is only used to add context to an error).
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func mount(source, target, procfd, fstype string, flags uintptr, data string) error {
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dst := target
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if procfd != "" {
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dst = procfd
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}
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if err := unix.Mount(source, dst, fstype, flags, data); err != nil {
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return &mountError{
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op: "mount",
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source: source,
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target: target,
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procfd: procfd,
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flags: flags,
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data: data,
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err: err,
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}
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}
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return nil
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}
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// unmount is a simple unix.Unmount wrapper.
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func unmount(target string, flags int) error {
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err := unix.Unmount(target, flags)
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if err != nil {
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return &mountError{
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op: "unmount",
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target: target,
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flags: uintptr(flags),
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err: err,
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}
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}
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return nil
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}
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