Warning messages are printed and ignored if we use an unsupported option

When an unsupported limit on cgroups V1 rootless systems
is requested, podman prints an warning message and
ignores the option/flag.

```
  Target options/flags:
    --cpu-period, --cpu-quota, --cpu-rt-period, --cpu-rt-runtime,
    --cpus, --cpu-shares, --cpuset-cpus, --cpuset-mems, --memory,
    --memory-reservation, --memory-swap, --memory-swappiness,
    --blkio-weight, --device-read-bps, --device-write-bps,
    --device-read-iops, --device-write-iops, --blkio-weight-device
```

Related to https://github.com/containers/podman/discussions/10152

Signed-off-by: Toshiki Sonoda <sonoda.toshiki@fujitsu.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/pkg/specgen/generate/validate.go b/pkg/specgen/generate/validate.go
index 9c933d747..3c5d5fb96 100644
--- a/pkg/specgen/generate/validate.go
+++ b/pkg/specgen/generate/validate.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/containers/common/pkg/cgroups"
 	"github.com/containers/common/pkg/sysinfo"
+	"github.com/containers/podman/v4/pkg/rootless"
 	"github.com/containers/podman/v4/pkg/specgen"
 	"github.com/containers/podman/v4/utils"
 )
@@ -19,6 +20,11 @@ func verifyContainerResourcesCgroupV1(s *specgen.SpecGenerator) ([]string, error
 
 	sysInfo := sysinfo.New(true)
 
+	if s.ResourceLimits != nil && rootless.IsRootless() {
+		s.ResourceLimits = nil
+		warnings = append(warnings, "Resource limits are not supported and ignored on cgroups V1 rootless systems")
+	}
+
 	if s.ResourceLimits == nil {
 		return warnings, nil
 	}