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118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
package daemon
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import (
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"syscall"
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containertypes "github.com/docker/docker/api/types/container"
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"github.com/docker/docker/container"
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"github.com/docker/docker/oci"
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"github.com/opencontainers/runtime-spec/specs-go"
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)
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func (daemon *Daemon) createSpec(c *container.Container) (*specs.Spec, error) {
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s := oci.DefaultSpec()
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linkedEnv, err := daemon.setupLinkedContainers(c)
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if err != nil {
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return nil, err
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}
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// TODO Windows - this can be removed. Not used (UID/GID)
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rootUID, rootGID := daemon.GetRemappedUIDGID()
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if err := c.SetupWorkingDirectory(rootUID, rootGID); err != nil {
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return nil, err
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}
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// In base spec
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s.Hostname = c.FullHostname()
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// In s.Mounts
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mounts, err := daemon.setupMounts(c)
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if err != nil {
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return nil, err
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}
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for _, mount := range mounts {
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m := specs.Mount{
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Source: mount.Source,
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Destination: mount.Destination,
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}
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if !mount.Writable {
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m.Options = append(m.Options, "ro")
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}
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s.Mounts = append(s.Mounts, m)
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}
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// In s.Process
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s.Process.Args = append([]string{c.Path}, c.Args...)
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if !c.Config.ArgsEscaped {
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s.Process.Args = escapeArgs(s.Process.Args)
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}
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s.Process.Cwd = c.Config.WorkingDir
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if len(s.Process.Cwd) == 0 {
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// We default to C:\ to workaround the oddity of the case that the
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// default directory for cmd running as LocalSystem (or
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// ContainerAdministrator) is c:\windows\system32. Hence docker run
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// <image> cmd will by default end in c:\windows\system32, rather
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// than 'root' (/) on Linux. The oddity is that if you have a dockerfile
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// which has no WORKDIR and has a COPY file ., . will be interpreted
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// as c:\. Hence, setting it to default of c:\ makes for consistency.
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s.Process.Cwd = `C:\`
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}
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s.Process.Env = c.CreateDaemonEnvironment(c.Config.Tty, linkedEnv)
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s.Process.ConsoleSize.Height = c.HostConfig.ConsoleSize[0]
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s.Process.ConsoleSize.Width = c.HostConfig.ConsoleSize[1]
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s.Process.Terminal = c.Config.Tty
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s.Process.User.Username = c.Config.User
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// In spec.Root. This is not set for Hyper-V containers
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isHyperV := false
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if c.HostConfig.Isolation.IsDefault() {
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// Container using default isolation, so take the default from the daemon configuration
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isHyperV = daemon.defaultIsolation.IsHyperV()
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} else {
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// Container may be requesting an explicit isolation mode.
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isHyperV = c.HostConfig.Isolation.IsHyperV()
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}
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if !isHyperV {
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s.Root.Path = c.BaseFS
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}
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s.Root.Readonly = false // Windows does not support a read-only root filesystem
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// In s.Windows.Resources
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// @darrenstahlmsft implement these resources
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cpuShares := uint16(c.HostConfig.CPUShares)
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cpuPercent := uint8(c.HostConfig.CPUPercent)
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memoryLimit := uint64(c.HostConfig.Memory)
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s.Windows.Resources = &specs.WindowsResources{
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CPU: &specs.WindowsCPUResources{
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Percent: &cpuPercent,
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Shares: &cpuShares,
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},
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Memory: &specs.WindowsMemoryResources{
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Limit: &memoryLimit,
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//TODO Reservation: ...,
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},
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Network: &specs.WindowsNetworkResources{
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//TODO Bandwidth: ...,
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},
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Storage: &specs.WindowsStorageResources{
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Bps: &c.HostConfig.IOMaximumBandwidth,
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Iops: &c.HostConfig.IOMaximumIOps,
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},
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}
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return (*specs.Spec)(&s), nil
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}
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func escapeArgs(args []string) []string {
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escapedArgs := make([]string, len(args))
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for i, a := range args {
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escapedArgs[i] = syscall.EscapeArg(a)
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}
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return escapedArgs
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}
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// mergeUlimits merge the Ulimits from HostConfig with daemon defaults, and update HostConfig
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// It will do nothing on non-Linux platform
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func (daemon *Daemon) mergeUlimits(c *containertypes.HostConfig) {
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return
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}
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