What does [COMMAND=/usr/lib/update-notifier/package-system-locked] mean in the logs?

Question

linux

I saw the following entries in the logs:

Apr 8 04:23:18 user1000 pkexec[7363]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Apr 8 04:23:18 user1000 pkexec[7363 ]: user1000: Executing command [USER=root] [TTY=unknown] [CWD=/home/

user1000 ] [COMMAND=/usr/lib/update-notifier/package-system-locked] did nothing at the moment. How to see in more detail what happened at the moment

Answer 1

In general - check for system updates. And in particular - checking that at the moment there is no installation of any packages (launched by someone earlier), so that there is no conflict. A lock file is created for the duration of the installation/update, so that by its presence nothing else starts to be installed/updated in parallel. This is the file that the script tries to detect:

[email protected]:~$ cat /usr/lib/update-notifier/package-system-locked

#!/bin/sh
# check if package system is locked
# return 0 if unlocked, 2 if locked, 1 on error
set -e

for f in /var/lib/dpkg/lock /var/cache/apt/archives/lock \
    /var/lib/apt/lists/lock /run/unattended-upgrades.lock; do
    [ -e $f ] || continue

    # fuser succeeds if there is at least one user
    if fuser $f; then
        exit 2
    fi
done

exit 0