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# Adding a podman V2 commands
## Build podman V2
```shell script
$ cd $GOPATH/src/github.com/containers/libpod/cmd/podmanV2
```
If you wish to include the libpod library in your program,
```shell script
$ go build -tags 'ABISupport' .
```
The `--remote` flag may be used to connect to the Podman service using the API.
Otherwise, direct calls will be made to the Libpod library.
```shell script
$ go build -tags '!ABISupport' .
```
The Libpod library is not linked into the executable.
All calls are made via the API and `--remote=False` is an error condition.
## Adding a new command `podman manifests`
```shell script
$ mkdir -p $GOPATH/src/github.com/containers/libpod/cmd/podmanV2/manifests
```
Create the file ```$GOPATH/src/github.com/containers/libpod/cmd/podmanV2/manifests/manifest.go```
```go
package manifests
import (
"github.com/containers/libpod/cmd/podman/registry"
"github.com/containers/libpod/pkg/domain/entities"
"github.com/spf13/cobra"
)
var (
// podman _manifests_
manifestCmd = &cobra.Command{
Use: "manifest",
Short: "Manage manifests",
Long: "Manage manifests",
Example: "podman manifests IMAGE",
TraverseChildren: true,
PersistentPreRunE: preRunE,
RunE: registry.SubCommandExists, // Report error if there is no sub command given
}
)
func init() {
// Subscribe command to podman
registry.Commands = append(registry.Commands, registry.CliCommand{
// _podman manifest_ will support both ABIMode and TunnelMode
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
// The definition for this command
Command: manifestCmd,
})
// Setup cobra templates, sub commands will inherit
manifestCmd.SetHelpTemplate(registry.HelpTemplate())
manifestCmd.SetUsageTemplate(registry.UsageTemplate())
}
// preRunE populates the image engine for sub commands
func preRunE(cmd *cobra.Command, args []string) error {
_, err := registry.NewImageEngine(cmd, args)
return err
}
```
To "wire" in the `manifest` command, edit the file ```$GOPATH/src/github.com/containers/libpod/cmd/podmanV2/main.go``` to add:
```go
package main
import _ "github.com/containers/libpod/cmd/podman/manifests"
```
## Adding a new sub command `podman manifests list`
Create the file ```$GOPATH/src/github.com/containers/libpod/cmd/podmanV2/manifests/inspect.go```
```go
package manifests
import (
"github.com/containers/libpod/cmd/podman/registry"
"github.com/containers/libpod/pkg/domain/entities"
"github.com/spf13/cobra"
)
var (
// podman manifests _inspect_
inspectCmd = &cobra.Command{
Use: "inspect IMAGE",
Short: "Display manifest from image",
Long: "Displays the low-level information on a manifest identified by image name or ID",
RunE: inspect,
Example: "podman manifest DEADBEEF",
}
)
func init() {
// Subscribe inspect sub command to manifest command
registry.Commands = append(registry.Commands, registry.CliCommand{
// _podman manifest inspect_ will support both ABIMode and TunnelMode
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
// The definition for this command
Command: inspectCmd,
Parent: manifestCmd,
})
// This is where you would configure the cobra flags using inspectCmd.Flags()
}
// Business logic: cmd is inspectCmd, args is the positional arguments from os.Args
func inspect(cmd *cobra.Command, args []string) error {
// Business logic using registry.ImageEngine
// Do not pull from libpod directly use the domain objects and types
return nil
}
```
|
