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86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
package oci // import "github.com/docker/docker/oci"
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/opencontainers/runc/libcontainer/devices"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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// Device transforms a libcontainer configs.Device to a specs.LinuxDevice object.
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func Device(d *configs.Device) specs.LinuxDevice {
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return specs.LinuxDevice{
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Type: string(d.Type),
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Path: d.Path,
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Major: d.Major,
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Minor: d.Minor,
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FileMode: fmPtr(int64(d.FileMode)),
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UID: u32Ptr(int64(d.Uid)),
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GID: u32Ptr(int64(d.Gid)),
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}
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}
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func deviceCgroup(d *configs.Device) specs.LinuxDeviceCgroup {
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return specs.LinuxDeviceCgroup{
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Allow: true,
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Type: string(d.Type),
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Major: &d.Major,
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Minor: &d.Minor,
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Access: string(d.Permissions),
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}
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}
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// DevicesFromPath computes a list of devices and device permissions from paths (pathOnHost and pathInContainer) and cgroup permissions.
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func DevicesFromPath(pathOnHost, pathInContainer, cgroupPermissions string) (devs []specs.LinuxDevice, devPermissions []specs.LinuxDeviceCgroup, err error) {
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resolvedPathOnHost := pathOnHost
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// check if it is a symbolic link
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if src, e := os.Lstat(pathOnHost); e == nil && src.Mode()&os.ModeSymlink == os.ModeSymlink {
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if linkedPathOnHost, e := filepath.EvalSymlinks(pathOnHost); e == nil {
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resolvedPathOnHost = linkedPathOnHost
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}
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}
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device, err := devices.DeviceFromPath(resolvedPathOnHost, cgroupPermissions)
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// if there was no error, return the device
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if err == nil {
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device.Path = pathInContainer
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return append(devs, Device(device)), append(devPermissions, deviceCgroup(device)), nil
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}
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// if the device is not a device node
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// try to see if it's a directory holding many devices
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if err == devices.ErrNotADevice {
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// check if it is a directory
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if src, e := os.Stat(resolvedPathOnHost); e == nil && src.IsDir() {
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// mount the internal devices recursively
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// TODO check if additional errors should be handled or logged
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_ = filepath.Walk(resolvedPathOnHost, func(dpath string, f os.FileInfo, _ error) error {
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childDevice, e := devices.DeviceFromPath(dpath, cgroupPermissions)
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if e != nil {
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// ignore the device
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return nil
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}
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// add the device to userSpecified devices
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childDevice.Path = strings.Replace(dpath, resolvedPathOnHost, pathInContainer, 1)
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devs = append(devs, Device(childDevice))
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devPermissions = append(devPermissions, deviceCgroup(childDevice))
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return nil
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})
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}
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}
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if len(devs) > 0 {
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return devs, devPermissions, nil
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}
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return devs, devPermissions, fmt.Errorf("error gathering device information while adding custom device %q: %s", pathOnHost, err)
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}
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