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debconf-apt-progress - install packages using debconf to display a progress bar


debconf-apt-progress [--] command [args ...]
debconf-apt-progress --config
debconf-apt-progress --start
debconf-apt-progress --from waypoint --to waypoint [--] command [args ...]
debconf-apt-progress --stop


debconf-apt-progress installs packages using debconf to display a progress bar. The given
command should be any command-line apt frontend; specifically, it must send progress
information to the file descriptor selected by the "APT::Status-Fd" configuration option,
and must keep the file descriptors nominated by the "APT::Keep-Fds" configuration option
open when invoking debconf (directly or indirectly), as those file descriptors will be
used for the debconf passthrough protocol.

The arguments to the command you supply should generally include -y (for apt-get or
aptitude) or similar to avoid the apt frontend prompting for input. debconf-apt-progress
cannot do this itself because the appropriate argument may differ between apt frontends.

The --start, --stop, --from, and --to options may be used to create a progress bar with
multiple segments for different stages of installation, provided that the caller is a
debconf confmodule. The caller may also interact with the progress bar itself using the
debconf protocol if it so desires.

debconf locks its config database when it starts up, which makes it unfortunately
inconvenient to have one instance of debconf displaying the progress bar and another
passing through questions from packages being installed. If you're using a multiple-
segment progress bar, you'll need to eval the output of the --config option before
starting the debconf frontend to work around this. See "EXAMPLES" in the EXAMPLES section


Print environment variables necessary to start up a progress bar frontend.

Start up a progress bar, running from 0 to 100 by default. Use --from and --to to use
other endpoints.

--from waypoint
If used with --start, make the progress bar begin at waypoint rather than 0.

Otherwise, install packages with their progress bar beginning at this "waypoint". Must
be used with --to.

--to waypoint
If used with --start, make the progress bar end at waypoint rather than 100.

Otherwise, install packages with their progress bar ending at this "waypoint". Must be
used with --from.

Stop a running progress bar.

Avoid starting, stopping, or stepping the progress bar. Progress messages from apt,
media change events, and debconf questions will still be passed through to debconf.

--dlwaypoint percentage
Specify what percent of the progress bar to use for downloading packages. The
remainder will be used for installing packages. The default is to use 15% for
downloading and the remaining 85% for installing.

--logfile file
Send the normal output from apt to the given file.

Send the normal output from apt to stderr. If you supply neither --logfile nor
--logstderr, the normal output from apt will be discarded.

-- Terminate options. Since you will normally need to give at least the -y argument to
the command being run, you will usually need to use -- to prevent that being
interpreted as an option to debconf-apt-progress itself.


Install the GNOME desktop and an X window system development environment within a progress

debconf-apt-progress -- aptitude -y install gnome x-window-system-dev

Install the GNOME, KDE, and XFCE desktops within a single progress bar, allocating 45% of
the progress bar for each of GNOME and KDE and the remaining 10% for XFCE:

#! /bin/sh
set -e
case $1 in
eval "$(debconf-apt-progress --config)"
"$0" debconf
. /usr/share/debconf/confmodule
debconf-apt-progress --start
debconf-apt-progress --from 0 --to 45 -- apt-get -y install gnome
debconf-apt-progress --from 45 --to 90 -- apt-get -y install kde
debconf-apt-progress --from 90 --to 100 -- apt-get -y install xfce4
debconf-apt-progress --stop


The exit code of the specified command is returned, unless the user hit the cancel button
on the progress bar. If the cancel button was hit, a value of 30 is returned. To avoid
ambiguity, if the command returned 30, a value of 3 will be returned.


Colin Watson <[email protected]>

Joey Hess <[email protected]>


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