Warn on use of --kernel-memory

It has been deprecated and is no longer supported.  Fully remove it and
only print a warning if a user uses it.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2011695

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

3 files changed, 8 insertions, 13 deletions

diff --git a/cmd/podman/common/create.go b/cmd/podman/common/create.go
index dad79348d..1b01cd001 100644
--- a/cmd/podman/common/create.go
+++ b/cmd/podman/common/create.go
@@ -327,13 +327,10 @@ func DefineCreateFlags(cmd *cobra.Command, cf *entities.ContainerCreateOptions,
 		)
 		_ = cmd.RegisterFlagCompletionFunc(ipcFlagName, AutocompleteNamespace)
 
-		kernelMemoryFlagName := "kernel-memory"
-		createFlags.StringVar(
-			&cf.KernelMemory,
-			kernelMemoryFlagName, "",
-			"Kernel memory limit "+sizeWithUnitFormat,
+		createFlags.String(
+			"kernel-memory", "",
+			"DEPRECATED: Option is just hear for compatibility with Docker",
 		)
-		_ = cmd.RegisterFlagCompletionFunc(kernelMemoryFlagName, completion.AutocompleteNone)
 		// kernel-memory is deprecated in the runtime spec.
 		_ = createFlags.MarkHidden("kernel-memory")
 
diff --git a/cmd/podman/common/create_opts.go b/cmd/podman/common/create_opts.go
index 990c1c063..f2335a2be 100644
--- a/cmd/podman/common/create_opts.go
+++ b/cmd/podman/common/create_opts.go
@@ -18,7 +18,6 @@ import (
 	"github.com/containers/podman/v3/pkg/specgen"
 	"github.com/docker/docker/api/types/mount"
 	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
 )
 
 func stringMaptoArray(m map[string]string) []string {
@@ -385,9 +384,6 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, rtc *c
 	if cc.HostConfig.Memory > 0 {
 		cliOpts.Memory = strconv.Itoa(int(cc.HostConfig.Memory))
 	}
-	if cc.HostConfig.KernelMemory > 0 {
-		logrus.Warnf("The --kernel-memory flag has been deprecated. May not work properly on your system.")
-	}
 
 	if cc.HostConfig.MemoryReservation > 0 {
 		cliOpts.MemoryReservation = strconv.Itoa(int(cc.HostConfig.MemoryReservation))
@@ -409,9 +405,6 @@ func ContainerCreateToContainerCLIOpts(cc handlers.CreateContainerConfig, rtc *c
 		cliOpts.ShmSize = strconv.Itoa(int(cc.HostConfig.ShmSize))
 	}
 
-	if cc.HostConfig.KernelMemory > 0 {
-		cliOpts.KernelMemory = strconv.Itoa(int(cc.HostConfig.KernelMemory))
-	}
 	if len(cc.HostConfig.RestartPolicy.Name) > 0 {
 		policy := cc.HostConfig.RestartPolicy.Name
 		// only add restart count on failure
diff --git a/cmd/podman/containers/create.go b/cmd/podman/containers/create.go
index e004f4ab2..9610c29dc 100644
--- a/cmd/podman/containers/create.go
+++ b/cmd/podman/containers/create.go
@@ -21,6 +21,7 @@ import (
 	"github.com/containers/podman/v3/pkg/util"
 	"github.com/mattn/go-isatty"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
@@ -191,6 +192,10 @@ func CreateInit(c *cobra.Command, vals entities.ContainerCreateOptions, isInfra
 			vals.UserNS = "private"
 		}
 	}
+	if c.Flag("kernel-memory") != nil && c.Flag("kernel-memory").Changed {
+		logrus.Warnf("The --kernel-memory flag is no longer supported. This flag is a noop.")
+	}
+
 	if cliVals.LogDriver == define.PassthroughLogging {
 		if isatty.IsTerminal(0) || isatty.IsTerminal(1) || isatty.IsTerminal(2) {
 			return vals, errors.New("the '--log-driver passthrough' option cannot be used on a TTY")