How to test if a kinit is needed?

Question

I would like to add something to my .bashrc file to run a kinit if I need one. Is there a way to test if I need to do a kinit? Something like this:

if [ kinitNeeded ]; 
    do kinit; 
done

kinitNeeded() { ??? }

score 23 · Accepted Answer · answered May 17 '16 at 09:09

23

You could try klist -s. From the man page:

"causes klist to run silently (produce no output), but to still set the exit status according to whether it finds the credentials cache. The exit status is ‘0’ if klist finds a credentials cache, and ‘1’ if it does not or if the tickets are expired."

answered May 17 '16 at 09:09

tellisnz

548
4
10

1

I just tried this and `echo $?` gives an exit status of 2. – anthonybell May 17 '16 at 13:06
@anthonybell [seems to work for me](https://gist.github.com/tellisnz/76f2dbcad7f7330eb2961781dbca79d8) – tellisnz May 17 '16 at 15:03
@anthonybell your solution doesn't account for expired tickets.. you could do something like `klist -s | echo $? -gt 0` – tellisnz May 17 '16 at 15:08
I am getting an error when I run `kinit -s`: `kinit: option requires an argument -- 's'` – anthonybell May 17 '16 at 15:20
@anthonybell what is your os and klist version etc? – tellisnz May 17 '16 at 16:31
1

Thanks, this solution works. I was using `kinit -s` instead of `klist -s` – anthonybell May 22 '16 at 16:53
`if ! klist -s; then ...` – Diego Torres Milano Aug 10 '21 at 22:21

score 1 · Answer 2 · answered Aug 10 '21 at 21:52

1

Try:

klist -s; echo $?

Return 0 if is OK, 1 otherwise

answered Aug 10 '21 at 21:52

AskerT

11
1

Your answer doesn't bring anything new/useful regarding other existing answers. I suggest you to delete it. – Zilog80 Aug 11 '21 at 07:59
I wrote this comment after solving the same problem myself. – AskerT Oct 13 '21 at 15:24

score 0 · Answer 3 · answered May 17 '16 at 13:23

0

I found a solution, but it's a bit of a hack.

if [ `klist 2>&1 | grep -i 'No credentials' | wc -l` -gt 0 ]; then
    kinit
fi

answered May 17 '16 at 13:23

anthonybell

5,790
7
42
60

1

This doesn't address the situation when ticket is expired. @tellisnz's answer does. – waltersu May 21 '16 at 06:08

How to test if a kinit is needed?

3 Answers3