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, 16 insertions, 0 deletions

diff --git a/docs/source/markdown/podman-create.1.md.in b/docs/source/markdown/podman-create.1.md.in
index 7ec4fc66f..74348ac7d 100644
--- a/docs/source/markdown/podman-create.1.md.in
+++ b/docs/source/markdown/podman-create.1.md.in
@@ -131,6 +131,8 @@ On some systems, changing the CPU limits may not be allowed for non-root
 users. For more details, see
 https://github.com/containers/podman/blob/main/troubleshooting.md#26-running-containers-with-cpu-limits-fails-with-a-permissions-error
 
+This option is not supported on cgroups V1 rootless systems.
+
 @@option cpuset-cpus
 
 @@option cpuset-mems
@@ -165,18 +167,26 @@ Add a rule to the cgroup allowed devices list. The rule is expected to be in the
 
 Limit read rate (bytes per second) from a device (e.g. --device-read-bps=/dev/sda:1mb)
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--device-read-iops**=*path*
 
 Limit read rate (IO per second) from a device (e.g. --device-read-iops=/dev/sda:1000)
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--device-write-bps**=*path*
 
 Limit write rate (bytes per second) to a device (e.g. --device-write-bps=/dev/sda:1mb)
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--device-write-iops**=*path*
 
 Limit write rate (IO per second) to a device (e.g. --device-write-iops=/dev/sda:1000)
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--disable-content-trust**
 
 This is a Docker specific option to disable image verification to a Docker
@@ -366,6 +376,8 @@ RAM. If a limit of 0 is specified (not using **-m**), the container's memory is
 not limited. The actual limit may be rounded up to a multiple of the operating
 system's page size (the value would be very large, that's millions of trillions).
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--memory-reservation**=*limit*
 
 Memory soft limit (format: `<number>[<unit>]`, where unit = b (bytes), k (kibibytes), m (mebibytes), or g (gibibytes))
@@ -376,6 +388,8 @@ reservation. So you should always set the value below **--memory**, otherwise th
 hard limit will take precedence. By default, memory reservation will be the same
 as memory limit.
 
+This option is not supported on cgroups V1 rootless systems.
+
 #### **--memory-swap**=*limit*
 
 A limit value equal to memory plus swap. Must be used with the  **-m**
@@ -387,6 +401,8 @@ The format of `LIMIT` is `<number>[<unit>]`. Unit can be `b` (bytes),
 `k` (kibibytes), `m` (mebibytes), or `g` (gibibytes). If you don't specify a
 unit, `b` is used. Set LIMIT to `-1` to enable unlimited swap.
 
+This option is not supported on cgroups V1 rootless systems.
+
 @@option memory-swappiness
 
 @@option mount