Add SFTP protocol option to use sudo on login

[Reto4]

Sorry to say, but this is kind of a killer feature of WinSCP. On the other hand, it only understands putty private keys...

• ​https://stackoverflow.com/questions/6414158/winscp-connect-to-amazon-ami-ec2-instance-changing-user-after-login-to-root
• ​https://stackoverflow.com/questions/34798936/how-to-run-sudo-command-in-winscp-to-transfer-files-from-windows-to-linux
• ​https://winscp.net/eng/docs/faq_su
• ​https://unix.stackexchange.com/questions/111026/how-to-use-sftp-on-a-system-that-requires-sudo-for-root-access-ssh-key-based-a

[Dmitry]

I also need this feature extremely.
This is sad, but currently, I have to give up FileZilla in favor of WinSCP, because I need to execute command like "sudo -u tools.PROJECT-NAME /usr/lib/sftp-server" right after logging in (authorisation under tool account). If I don't do that, I'm authorized under my private account and cannot access some of the files, and also new files will have wrong permissions.

See ​https://wikitech.wikimedia.org/wiki/Help:Access_to_Toolforge_instances_with_PuTTY_and_WinSCP

This is standard way to work in Labs/Toolforge projects (Toolforge - public tools hosting of Wikipedia/Wikimedia projects).

[Tim Kosse]

sudo is not part of the SFTP specifications.

sudo is an undefined, system-specific command on interactive shells that isn't portable.