Improve `balena scan` sudo situation

[pdcastro]

As per product feedback (gsheet), "balena scan requires admin privileges but the message is messy and hard to understand".

Instead of the current message:

PS C:\Users\paulo> balena scan
You don't have sufficient privileges to run this operation.
Run a new Command Prompt as administrator and try running this command again.

If this is not the case, and you're trying to burn an SDCard, check that the write lock is not set.

• Implement dynamic privilege escalation. On Windows, a pop-up would be raised asking the user to click Yes (or similar) to authorize running the command with administrator permissions. I believe the CLI already does it for other commands: https://github.com/balena-io/balena-cli/blob/v11.30.17/lib/utils/sudo.ts#L73

• Alternatively, perhaps the CLI could re-execute itself using the runas shell command: https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/cc771525(v=ws.11)

• If that's not easily / reasonably possible, then reword the message:

PS C:\Users\paulo> balena scan
This command needs to be run as an administrator. Open a new command prompt
using the start menu "Run As Administrator" option. For additional guidance, see:
https://www.howtogeek.com/194041/how-to-open-the-command-prompt-as-administrator-in-windows-8.1/

Perhaps avoid the howtogeek link by choosing a widely available method and explaining how to do it in very few sentences (1-2-3 steps?) on the CLI output itself. Be sure that this explanation is not printed in red-on-bue! See #1712

[pdcastro]

Connects-to: #542

[Sukhoimaster]

I fix this by adding balena /bin directory in the secure_path option in /etc/sudoers

Using : Linux 16.04.1-Ubuntu x86_64 x86_64 x86_64 GNU/Linux Kernel : 4.15.0-106-generic NPM : 6.14.4 Nodes : v10.20.0

After complete via NPM installation as per https://github.com/balena-io/balena-cli/blob/master/INSTALL.md#npm-installation

• Locate balena directory by run in terminal which balena

the path output will be added to the secure_path option in /etc/sudoers

As in my case /home/sonix/.nvm/versions/node/v10.20.0/bin/

• run sudo visudo locate Defaults secure_path add the path at the end. With care without messing the original (unless youre a guru)

Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/home/sonix/.nvm/versions/node/v10.20.0/bin/"

CTRL + X to save then Yes . In return resulting visudo: /etc/sudoers.tmp saved

• Restart new terminal

After this fix , resolve all the privileges and sudo:balena: Command not found issue

Able to run balena without sudo

[srlowe]

@pdcastro I think we should close either this or #542 as duplicate, since they are the same issue.