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Merge pull request #400 from sameo/topic/oci-process

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server: Fix the OCI process arguments build routine
This commit is contained in:
Antonio Murdaca 2017-03-24 09:07:00 +01:00 committed by GitHub
commit 673b6e4c51
1 changed files with 55 additions and 22 deletions
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77
server/container_create.go
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@ -60,6 +60,7 @@ func addOciBindMounts(sb *sandbox, containerConfig *pb.ContainerConfig, specgen
// buildOCIProcessArgs build an OCI compatible process arguments slice.
func buildOCIProcessArgs(containerKubeConfig *pb.ContainerConfig, imageOCIConfig *v1.Image) ([]string, error) {
processArgs := []string{}
var processEntryPoint, processCmd []string
kubeCommands := containerKubeConfig.Command
kubeArgs := containerKubeConfig.Args
@ -86,34 +87,66 @@ func buildOCIProcessArgs(containerKubeConfig *pb.ContainerConfig, imageOCIConfig
// We got an OCI Image configuration.
// We will only use it if the kubelet information is incomplete.
if kubeCommands == nil {
if imageOCIConfig != nil && imageOCIConfig.Config.Entrypoint != nil {
processArgs = append(processArgs, imageOCIConfig.Config.Entrypoint...)
}
// First we set the process entry point.
if kubeCommands != nil {
// The kubelet command slice is prioritized.
processEntryPoint = kubeCommands
} else {
processArgs = append(processArgs, kubeCommands...)
// Here the kubelet command slice is empty.
if imageOCIConfig != nil {
// If the OCI image config has an ENTRYPOINT we
// use it as our process command.
// Otherwise we use the CMD slice if it's not
// empty.
if imageOCIConfig.Config.Entrypoint != nil {
processEntryPoint = imageOCIConfig.Config.Entrypoint
} else if imageOCIConfig.Config.Cmd != nil {
processEntryPoint = imageOCIConfig.Config.Cmd
}
} else {
// We neither have a kubelet command not an image OCI config.
// Missing an image OCI config will no longer be supported after
// https://github.com/kubernetes-incubator/cri-o/issues/395 is fixed.
processEntryPoint = []string{"/bin/sh", "-c"}
}
}
if kubeArgs == nil {
// Our kubelet command arguments slice is empty.
// We will use the OCI Image configuration only if we already
// have found a process command, i.e. if processArgs is no
// longer empty. No doing so will have us create a process
// arguments slice starting with the OCI Image command arguments
// as the entry point.
if processArgs != nil &&
imageOCIConfig != nil &&
imageOCIConfig.Config.Entrypoint != nil && imageOCIConfig.Config.Cmd != nil {
processArgs = append(processArgs, imageOCIConfig.Config.Cmd...)
}
// Then we build the process command arguments
if kubeArgs != nil {
// The kubelet command arguments slice is prioritized.
processCmd = kubeArgs
} else {
processArgs = append(processArgs, kubeArgs...)
if kubeCommands != nil {
// kubelet gave us a command slice but explicitely
// left the arguments slice empty. We should keep
// it that way.
processCmd = []string{}
} else {
// Here kubelet kept both the command and arguments
// slices empty. We should try building the process
// arguments slice from the OCI image config.
// If the OCI image config has an ENTRYPOINT slice,
// we use the CMD slice as the process arguments.
// Otherwise, we already picked CMD as our process
// command and we must not add the CMD slice twice.
if imageOCIConfig != nil {
if imageOCIConfig.Config.Entrypoint != nil {
processCmd = imageOCIConfig.Config.Cmd
} else {
processCmd = []string{}
}
} else {
// Missing an image OCI config will no longer
// be supported after https://github.com/kubernetes-incubator/cri-o/issues/395
// is fixed.
processCmd = []string{}
}
}
}
if processArgs == nil {
// Use a reasonable default if everything failed.
processArgs = []string{"/bin/sh"}
}
processArgs = append(processArgs, processEntryPoint...)
processArgs = append(processArgs, processCmd...)
logrus.Debugf("OCI process args %v", processArgs)