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