Podman panics when Image ID is passed to pod create --infra-image

[mheon]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

The --infra-image flag to podman pod create panics when an image is specified by its ID, instead of its name. The image in question also had no tags, which could be a contributing factor.

Steps to reproduce the issue:

1. Select any valid, untagged image available on your system and copy it's ID.

2. podman pod create --name testpod --infra-image <ID>

Describe the results you received:

panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
github.com/containers/podman/v2/libpod.(*Runtime).createInfraContainer(0xc0005af1e0, 0x1e9c640, 0xc000130010, 0xc000143800, 0xc000723858, 0x1, 0x1)
	libpod/runtime_pod_infra_linux.go:228 +0x2ce
github.com/containers/podman/v2/libpod.(*Runtime).NewPod(0xc0005af1e0, 0x1e9c640, 0xc000130010, 0xc0005bbec0, 0xa, 0xc, 0x0, 0x0, 0x0)
	libpod/runtime_pod_linux.go:135 +0x5c6
github.com/containers/podman/v2/pkg/specgen/generate.MakePod(0xc0007239b0, 0xc0005af1e0, 0xc000138000, 0x7, 0x7)
	pkg/specgen/generate/pod_create.go:20 +0xd7
github.com/containers/podman/v2/pkg/domain/infra/abi.(*ContainerEngine).PodCreate(0xc0005b8880, 0x1e9c640, 0xc000130010, 0x0, 0x0, 0xc000138000, 0x7, 0x7, 0x0, 0x0, ...)
	pkg/domain/infra/abi/pods.go:254 +0xb5
github.com/containers/podman/v2/cmd/podman/pods.create(0x28ca4c0, 0xc00025aac0, 0x0, 0x4, 0x0, 0x0)
	cmd/podman/pods/create.go:188 +0x2d8
github.com/spf13/cobra.(*Command).execute(0x28ca4c0, 0xc000138030, 0x4, 0x4, 0x28ca4c0, 0xc000138030)
	vendor/github.com/spf13/cobra/command.go:852 +0x47c
github.com/spf13/cobra.(*Command).ExecuteC(0x28d21c0, 0xc000130010, 0x199ab60, 0x29866c0)
	vendor/github.com/spf13/cobra/command.go:960 +0x375
github.com/spf13/cobra.(*Command).Execute(...)
	vendor/github.com/spf13/cobra/command.go:897
github.com/spf13/cobra.(*Command).ExecuteContext(...)
	vendor/github.com/spf13/cobra/command.go:890
main.Execute()
	cmd/podman/root.go:92 +0xec
main.main()
	cmd/podman/main.go:37 +0x92

Describe the results you expected:

Pod and infra image are created successfully.

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Originally observed on v2.2.1. Reproduces with v3.0 and latest code as well.