containerlab: Error: failed reading the file /root: read /root: is a directory

Hello,

So I’m using containerlab for the first time on Ubuntu (22.04.2 LTS) and I’m encountering this issue:

name: simple
topology:
  nodes:
    srl:
      kind: nokia_srlinux
      image: ghcr.io/nokia/srlinux

I first tried with a config file and it failed, so I tried with no config file at all and got the same error.

$ docker images | grep srlinux
ghcr.io/nokia/srlinux      latest    07c39b3d625e   3 weeks ago    2.45GB

Trace:

$ sudo containerlab --log-level trace deploy
DEBU[0000] trying to find topology files automatically  
DEBU[0000] topology file found: simple.clab.yml         
INFO[0000] Containerlab v0.42.0 started                 
DEBU[0000] template variables: <nil>                    
DEBU[0000] topology:
name: simple
topology:
  nodes:
    srl:
      kind: nokia_srlinux
      image: ghcr.io/nokia/srlinux
 
DEBU[0000] method initMgmtNetwork was called mgmt params &{Network: Bridge: IPv4Subnet: IPv4Gw: IPv4Range: IPv6Subnet: IPv6Gw: IPv6Range: MTU: ExternalAccess:<nil>} 
DEBU[0000] New mgmt params are &{Network:clab Bridge: IPv4Subnet:172.20.20.0/24 IPv4Gw: IPv4Range: IPv6Subnet:2001:172:20:20::/64 IPv6Gw: IPv6Range: MTU: ExternalAccess:0xc000caf30a} 
DEBU[0000] env runtime var value is                     
DEBU[0000] Running runtime.Init with params &{Timeout:2m0s GracefulShutdown:false Debug:false KeepMgmtNet:false} and &{Network:clab Bridge: IPv4Subnet:172.20.20.0/24 IPv4Gw: IPv4Range: IPv6Subnet:2001:172:20:20::/64 IPv6Gw: IPv6Range: MTU: ExternalAccess:0xc000caf30a} 
DEBU[0000] Runtime: Docker                              
DEBU[0000] detected docker network mtu value - 1500     
DEBU[0000] initialized a runtime with params &{config:{Timeout:120000000000 GracefulShutdown:false Debug:false KeepMgmtNet:false} Client:0xc000cb2b00 mgmt:0xc000746000} 
INFO[0000] Parsing & checking topology file: simple.clab.yml 
DEBU[0000] node config: &{ShortName:srl LongName:clab-simple-srl Fqdn:srl.simple.io LabDir:/home/USERNAME/workspace/containerlab/simple/clab-simple/srl Index:0 Group: Kind:nokia_srlinux StartupConfig: StartupDelay:0 EnforceStartupConfig:false AutoRemove:0xc0007ac98a ResStartupConfig: Config:<nil> ResConfig: NodeType: Position: License: Image:ghcr.io/nokia/srlinux ImagePullPolicy:IfNotPresent Sysctls:map[] User: Entrypoint: Cmd: Exec:[] Env:map[] Binds:[] PortBindings:map[] PortSet:map[] NetworkMode: MgmtNet: MgmtIntf: MgmtIPv4Address: MgmtIPv4PrefixLength:0 MgmtIPv6Address: MgmtIPv6PrefixLength:0 MgmtIPv4Gateway: MgmtIPv6Gateway: MacAddress: ContainerID: TLSCert: TLSKey: TLSAnchor: Certificate:<nil> NSPath: Publish:[] ExtraHosts:[] Labels:map[] Endpoints:[] SANs:[] Sandbox: Kernel: Runtime: CPU:0 CPUSet: Memory: Extras:<nil> WaitFor:[] DNS:<nil> IsRootNamespaceBased:false} 
DEBU[0000] lab Conf: &{Name:simple Prefix:0xc000a26140 Mgmt:0xc000746000 Topology:0xc0009e8210 Debug:false} 
DEBU[0000] Env: CLAB_VERSION_CHECK=                     
DEBU[0000] kernel version: 5.19.0-45-generic            
DEBU[0000] Looking up ghcr.io/nokia/srlinux Docker image 
DEBU[0000] Image ghcr.io/nokia/srlinux present, skip pulling 
DEBU[0000] kernel module "ip_tables" is already loaded  
DEBU[0000] kernel module "ip6_tables" is already loaded 
INFO[0000] Creating lab directory: /home/USERNAME/workspace/containerlab/simple/clab-simple 
DEBU[0000] failed loading csr /home/USERNAME/workspace/containerlab/simple/clab-simple/.tls/ca/ca.csr, continuing anyways 
DEBU[0000] SSH_AUTH_SOCK not set, skipping pubkey fetching 
DEBU[0000] extracted 0 keys from ssh-agent              
Error: failed reading the file /root: read /root: is a directory

I did not find any issue related to this error message. Any clue?

Sorry if it seems obvious or not related to containerlab, I do not know how to dig further into the issue.

Thanks.