NAME

       deb-systemd-helper - subset of systemctl for machines not running systemd

SYNOPSIS

       deb-systemd-helper enable | disable | purge | mask | unmask | is-enabled | was-enabled |
       debian-installed | update-state | reenable unit file ...

DESCRIPTION

       deb-systemd-helper is a Debian-specific helper script which re-implements the enable,
       disable, is-enabled and reenable commands from systemctl.

       The "enable" action will only be performed once (when first installing the package). On
       the first "enable", a state file is created which will be deleted upon "purge".

       The "mask" action will keep state on whether the service was enabled/disabled before and
       will properly return to that state on "unmask".

       The "was-enabled" action is not present in systemctl, but is required in Debian so that we
       can figure out whether a service was enabled before we installed an updated service file.
       See http://bugs.debian.org/717603 for details.

       The "debian-installed" action is also not present in systemctl. It returns 0 if the state
       file of at least one of the given units is present.

       The "update-state" action is also not present in systemctl. It updates deb-systemd-
       helper's state file, removing obsolete entries (e.g. service files that are no longer
       shipped by the package) and adding new entries (e.g.  new service files shipped by the
       package) without enabling them.

       deb-systemd-helper is intended to be used from maintscripts to enable systemd unit files.
       It is specifically NOT intended to be used interactively by users. Instead, users should
       run systemd and use systemctl, or not bother about the systemd enabled state in case they
       are not running systemd.

ENVIRONMENT

       _DEB_SYSTEMD_HELPER_DEBUG
           If you export _DEB_SYSTEMD_HELPER_DEBUG=1, deb-systemd-helper will print debug
           messages to stderr (thus visible in dpkg runs). Please include these when filing a
           bugreport.

       DPKG_ROOT
           Instead of working on the filesystem root /, perform all operations on a chroot system
           in the directory given by DPKG_ROOT.

AUTHOR

       Michael Stapelberg <stapelberg@debian.org>