How to find whether system uses systemd in chroot?

Question

I was using the following command to check whether system uses systemd
if [[ 1 == pidof systemd ]]; then

But this fails in chroot since proc is not mounted.

sh-4.2# pidof systemd sh-4.2# ps Error, do this: mount -t proc proc /proc

What alternative method can be used to check whether system uses systemd or sysv?

If so, the script will register the service to systemd, otherwise no. — nithinj, Dec 08 '16 at 18:12
Possible duplicate of [how to know if I am using systemd on my linux?](http://superuser.com/questions/1017959/how-to-know-if-i-am-using-systemd-on-my-linux) — Mark Stosberg, Dec 08 '16 at 18:42
Just to clarify, you are trying to verify things from within the chroot environment? How are you going to configure systemd outside the chroot, from inside it? — Zoredache, Dec 08 '16 at 19:05
My intention is to enable systemd within the chroot jail (It could be another OS) — nithinj, Dec 09 '16 at 04:19
@MarkStosberg, This question is specific to chroot jail and it is mentioned in the question. It may not be a duplicate. — nithinj, Dec 09 '16 at 04:29

score 0 · Answer 1 · answered Dec 08 '16 at 18:47

0

You can check if /sbin/init is a symlink to systemd. This isn't as good as the ps method because it's possible (but unlikely) that something besides /sbin/init is pid 1.

if [[ `file /sbin/init | grep -q systemd && echo 1` = 1 ]]

answered Dec 08 '16 at 18:47

Mark Stosberg

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But this is in a chroot (see the title/tags)? The init binary doesn't need to be in the chroot. Or you could have an init binary, that isn't the same as the system init. – Zoredache Dec 08 '16 at 19:01
It works in my chroot environment. But not sure there are any caveats like @Zoredache said. – nithinj Dec 09 '16 at 04:31

How to find whether system uses systemd in chroot?

1 Answers1