setup_checks.sh: add sudo to iw call

[niziak]

No description provided.

[kueblc]

Hi @niziak thanks for the PR!

Can you explain why this call need to be made as root? On my machine I can run iw list as user.

[wutje]

On my Debian 10 machine iw returns not found, sudo iw works.

[niziak]

Yes. On Debian iw is installed in /usr/sbin/ and default user $PATH doesn't include sbin's paths.

[kueblc]

Interesting, thanks for the explanation!

Since the actual problem is that it is missing from PATH, would it make sense to update the PATH env variable? This way we can minimize the need for escalated privileges. Happy to hear your thoughts.

[wutje]

On my Debian 10 machines iw is in /sbin, not /usr/bin. And a normal user is allowed to execute it.

[niziak]

Since the actual problem is that it is missing from PATH, would it make sense to update the PATH env variable? This way we can minimize the need for escalated privileges. Happy to hear your thoughts.

Yes, problem is in PATH variable. iw can be executed by unrpivileged user.
Debian's /etc/profile file:

# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).

if [ "`id -u`" -eq 0 ]; then
  PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
else
  PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
fi
export PATH

Perhaps this workaround can be universal for everyone:

$(whereis -b iw | awk '{print $2}')