marcanuy's questions

I have a systemd.socket named gunicorn.socket which I would like to restart after updating some code on a remote server.

I've followed the steps detailed in Allowing a non-root user to restart a service and systemctl keeps asking for my user password. Here is what I've done trying to run systemctl restart gunicorn.socket with user john:

# added an appadmin group to allow the restart command to john
addgroup appadmin
usermod -a -G appadmin john
visudo

In sudoers:

Cmnd_Alias MYAPP_CMNDS = /bin/systemctl start gunicorn.socket, /bin/systemctl stop gunicorn.socket, /bin/systemctl restart gunicorn.socket
%appadmin ALL=(ALL) NOPASSWD: MYAPP_CMNDS

Then sudo systemctl restart gunicorn.socket works fine while being on the server, but when I try it remotely I get:

ssh example.com "sudo systemctl restart gunicorn.socket"
Failed to restart gunicorn.socket: Interactive authentication required.
See system logs and 'systemctl status gunicorn.socket' for details.

Any ideas? I'm using Ubuntu 17.04.

Update: adding full content of /etc/sudoers:

Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"

# Cmnd alias specification
Cmnd_Alias MYAPP_CMNDS = /bin/systemctl start gunicorn.socket, /bin/systemctl stop gunicorn.socket, /bin/systemctl restart gunicorn.socket
%appadmin ALL=(ALL) NOPASSWD: MYAPP_CMNDS

# User privilege specification
root    ALL=(ALL:ALL) ALL
john        ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

Let's say I have a folder Documents and a TAR file Documents.tar, how to check if the tar file contains the same files that are present in the directory?

The more obvious solution to me would be to do:

$ tar xvf Documents.tar -C untarDocs
$ diff -r Documents untarDocs

Unfortunately this is very slow for large TAR files, is there any other alternative?

*Update: tar -dvf Documents.tar (or --diff, --compare) doesn't work because it doesn't detect a file that is present in the filesystem but not in the TAR file, it just detects a file present in the TAR file but not in the filesystem e.g.:

$ mkdir new
$ touch new/foo{1..4}
$ tar cvf new.tar new/
$ touch new/bar
$ tar --diff --verbose --file=new.tar       #### doesn't detect new/bar #########
$ rm new/foo1
$ tar --diff --verbose --file=new.tar

Output

new/
new/foo2
new/foo3
new/foo4
new/foo1
tar: new/foo1: Warning: Cannot stat: No such file or directory   ### works ###