User:Toshio/Systemd scriptlet options

There are two options for scriptlets depending on whether we should care about user configuration of what services start in the past.

Start over fresh

%post
if [ $1 -eq 1 ] ; then 
    # Initial installation 
    # If a package is allowed to autostart:
    /bin/systemctl enable httpd.service >/dev/null 2>&1 || :
    # No autostart:
    # /bin/systemctl daemon-reload >/dev/null 2>&1 || :
fi

%preun
if [ $1 -eq 0 ] ; then
    # Package removal, not upgrade
    /bin/systemctl --no-reload disable httpd.service > /dev/null 2>&1 || :
    /bin/systemctl stop httpd.service > /dev/null 2>&1 || :
fi

%postun
/bin/systemctl daemon-reload >/dev/null 2>&1 || :
if [ $1 -ge 1 ] ; then
    # Package upgrade, not uninstall
    /bin/systemctl try-restart httpd.service >/dev/null 2>&1 || :
fi

# Note: the NEVR in trigger scripts should all be the version in
# which the package switched to systemd unit files and the comparision
# should be less than.  Using <= the last version with the sysV script won't
# work for several reasons:
# 1) disttag is different between Fedora releases
# 2) An update in an old Fedora release may create a newer NEVR

%triggerun -- httpd < 1.0-2  
# Run this because the chkconfig --del in the SysV providing package won't
# fire unless the package is removed
/sbin/chkconfig --del httpd >/dev/null 2>&1 || :

# If the package is allowed to autostart:
/bin/systemctl enable httpd.service >/dev/null 2>&1

# Run these because the SysV package being removed won't do it
/bin/systemctl try-restart httpd.service >/dev/null 2>&1 || :
/bin/systemctl daemon-reload >/dev/null 2>&1 || :


# If we're shipping sysvinit scripts
%triggerpostun -n httpd-sysvinit -- httpd < 1.0-2
/sbin/chkconfig --add httpd >/dev/null 2>&1 || :

Be sure to test that the try-restart in the trigger restarts the daemon if it was running in a former sysv package and also does not enable a daemon if it wasn't running.

Preserve user defaults

%triggerun -- foo < 1.0-2
/sbin/chkconfig --del bar >/dev/null 2>&1 || :
if chkconfig --level --no-redirect 1 foo ; then
    ln -sf /lib/systemd/system/foo.service /etc/systemd/system/rescue.target.wants/ 2>&1 >/dev/null
multiuser=0
if chkconfig --level 3 foo; then
    ln -sf /lib/systemd/system/foo.service /etc/systemd/system/multi-user.target.wants/ 2>&1 >/dev/null
    multiuser=1
fi
if chkconfig --level 5 foo; then
    # If it's already in multi-user, it will be inherited automatically
    if [ $multiuser -eq 0 ] ; then
        ln -sf /lib/systemd/system/foo.service /etc/systemd/system/graphical.target.wants/ 2>&1 >/dev/null
    fi
else
    if [ $multiuser -eq 1 ] ; then
       # We have the option of disabling the service in graphical here to
       # match what the user explicitly customized their system to like
       # this:
       ln -sf /dev/null /etc/systemd/system/graphical.target.wants/foo.service
       # But we could also decide that this is not something that we're going
       # to migrate (as systemd itself sets graphical up as a strict
       # superset of multi-user).
    fi
fi
/bin/systemctl daemon-reload >/dev/null 2>&1 || :