I have to run a script remotely on several Fedora machines through ssh. Since the script requires root priviliges, I do:
$ ssh me@remost_host "sudo touch test_sudo" #just a simple example
sudo: no tty present and no askpass program specified
The remote machines are configured in such a way that the password for sudo is never asked for.
For the above error, the most common fix is to allocate a pseudo-terminal with the -t
option in ssh:
$ ssh -t me@remost_host "sudo touch test_sudo"
sudo: no tty present and no askpass program specified
Let's try to force this allocation with -t -t
:
$ ssh -t -t me@remost_host "sudo touch test_sudo"
sudo: no tty present and no askpass program specified
Nope, it doesn't work.
In /etc/sudoers
of course I have this line:
#Defaults requiretty
... but I can't manually change it on tens of remote machines.
Am I missing something here? Is there an easy fix?
EDIT:
- Here is the sudoers file of a host where
ssh me@host "sudo stat ."
works. - Here is the sudoers file of a host where it doesn't work.
EDIT 2:
Running tty
on a host where it works:
$ ssh me@host_ok tty
not a tty
$ ssh -t me@host_ok tty
/dev/pts/12
Connection to host_ok closed.
$ ssh -t -t me@host_ok tty
/dev/pts/12
Connection to host_ok closed.
Now on a host where it doesn't work:
$ ssh me@host_ko tty
not a tty
$ ssh -t me@host_ko tty
not a tty
Connection to host_ko closed.
$ ssh -t -t me@host_ko tty
not a tty
Connection to host_ko closed.
EDIT 3 Permissions on /dev/tty* on a machine where the above didn't work:
$ stat /dev/tty*
File: `/dev/tty'
Size: 0 Blocks: 0 IO Block: 4096 character special file
Device: fd02h/64770d Inode: 17089401 Links: 1 Device type: 5,0
Access: (0666/crw-rw-rw-) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-12-11 11:44:01.000000000 +0000
Modify: 2013-12-11 11:44:01.000000000 +0000
Change: 2014-01-20 15:43:36.000000000 +0000
EDIT 4
Ok, so in the /var/log/
I have the following:
$ ls /var/log
btmp lastlog maillog messages secure spooler sudo tallylog wtmp yum.log
I tried with messages
and secure
, but they are empty. sudo
on the other hand contains something... the only problem being it displays the same log message whether I use -t
, -t -t
or nothing:
Jun 4 17:38:52 : my_username : no tty present and no askpass program
specified ; TTY=unknown ; PWD=/home/my_username ; USER=root ;
COMMAND=/usr/bin/stat .