Add podman system renumber command

This command allows for renumbering Podman locks after an upgrade
to Podman with SHM locks from a 1.0 or earlier branch, or after
the number of locks was changed.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

3 files changed, 49 insertions, 0 deletions

diff --git a/cmd/podman/cliconfig/config.go b/cmd/podman/cliconfig/config.go
index ca788529c..a9032202f 100644
--- a/cmd/podman/cliconfig/config.go
+++ b/cmd/podman/cliconfig/config.go
@@ -548,3 +548,7 @@ type SystemPruneValues struct {
 	Force  bool
 	Volume bool
 }
+
+type SystemRenumberValues struct {
+	PodmanCommand
+}
diff --git a/cmd/podman/commands.go b/cmd/podman/commands.go
index 466ffa22f..0fc1b5a41 100644
--- a/cmd/podman/commands.go
+++ b/cmd/podman/commands.go
@@ -132,5 +132,6 @@ func getTrustSubCommands() []*cobra.Command {
 func getSystemSubCommands() []*cobra.Command {
 	return []*cobra.Command{
 		_pruneSystemCommand,
+		_renumberCommand,
 	}
 }
diff --git a/cmd/podman/system_renumber.go b/cmd/podman/system_renumber.go
new file mode 100644
index 000000000..7f9436d5d
--- /dev/null
+++ b/cmd/podman/system_renumber.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"github.com/containers/libpod/cmd/podman/cliconfig"
+	"github.com/containers/libpod/cmd/podman/libpodruntime"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+var (
+	renumberCommand     cliconfig.SystemRenumberValues
+	renumberDescription = `
+        podman system renumber
+
+        Migrate lock numbers to handle a change in maximum number of locks
+`
+
+	_renumberCommand = &cobra.Command{
+		Use:   "renumber",
+		Short: "Migrate lock numbers",
+		Long:  renumberDescription,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			renumberCommand.InputArgs = args
+			renumberCommand.GlobalFlags = MainGlobalOpts
+			return renumberCmd(&renumberCommand)
+		},
+	}
+)
+
+func init() {
+	renumberCommand.Command = _renumberCommand
+	renumberCommand.SetUsageTemplate(UsageTemplate())
+}
+
+func renumberCmd(c *cliconfig.SystemRenumberValues) error {
+	// We need to pass one extra option to NewRuntime.
+	// This will inform the OCI runtime to start
+	_, err := libpodruntime.GetRuntimeRenumber(&c.PodmanCommand)
+	if err != nil {
+		return errors.Wrapf(err, "error renumbering locks")
+	}
+
+	return nil
+}