I think it can be made to work. I do not know how apt/dpkg is
implemented, but I made an example by Bash:
script.sh file:
#!/bin/bash
#
exec {var}>/tmp/lock
flock -n $var || { echo already locked; exit 1; }
LOCK= /path/to/subscript.sh # edit this path
subscript.sh file:
#!/bin/bash
#
[[ -v LOCK ]] && { kill $PPID; sleep 3; } # kill the caller
exec {var}>/tmp/lock
flock -n $var && echo was not locked || echo was locked
The subscript.sh above kills the caller (if LOCK variable is set in its
environment). The subscript shows the lock is set even thereafter until the
subscript finishes.
Anyway I am missing something: Even if I lock /var/lib/dpkg/lock or
/var/lib/dpkg/lock-frontend this way (instead of locking /tmp/lock),
that does not prevent installing a package by apt install or dpkg
--install. But if I run Synaptic package manager by pkexec
"/usr/sbin/synaptic", it locks the files and prevents installing by apt
or dpkg from outside.
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https://bugs.launchpad.net/bugs/1796081
Title:
dpkg frontend locking
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