Currently, if a non-root user attempts to run ip vrf exec a non-helpful
error is returned:
$ ip vrf exec mgmt bash
Failed to mount cgroup2. Are CGROUPS enabled in your kernel?
Only show the CGROUPS kernel hint for the ENODEV error and for the
rest show the strerror for the errno. So now:
$ ip/ip vrf exec mgmt bash
Failed to mount cgroup2: Operation not permitted
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Andy reported a missing newline if a non-root user attempts to run
'ip vrf exec':
$ ./ip/ip vrf exec default /bin/echo asdf
mkdir failed for /var/run/cgroup2: Permission deniedFailed to setup vrf cgroup2 directory
Reported-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Add make_path to recursively call mkdir as needed to create a given
path with the given mode.
Add find_cgroup2_mount to lookup path where cgroup2 is mounted. If it
is not already mounted, cgroup2 is mounted under /var/run/cgroup2 for
use by iproute2.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
