ucfr Man page

UCFR(1) Debian GNU/Linux manual UCFR(1)


ucfr – Update Configuration File Registry: associate packages with
configuration files


ucfr [options]


Where Package is the package associated with the configuration file
(and, in some sense, its owner), and Path to configuration file is the
full path to the location (usually under /etc) where the configuration
file lives, and is potentially modified by the end user. Please note
that usually this means that we register actual files, and not symbolic
links to files. ucfr will follow symbolic links and register the real
file, and not the symbolic link.

This script maintains an association between configuration files and
packages, and is meant to help provide facilities that dpkg provides
conffiles for configuration files and not shipped in a Debian package,
but handled by the postinst by ucf instead. This script is idempotent,
associating a package to a file multiple times is not an error. It is
normally an error to try to associate a file which is already associ‐
ated with another package, but this can be over ridden by using the
–force option.


-h, –help
Print a short usage message

-n, –no-action
Dry run. Print the actions that would be taken if the script is
invoked, but take no action.

-d [n], –debug [n] Set the debug level to the (optional) level n (n defaults to 1).
This turns on copious debugging information.

-p, –purge
Removes all vestiges of the association between the named pack‐
age and the configuration file from the registry. The associa‐
tion must already exist; if the configuration file is associated
with some other package, an error happens, unless the option
–force is also given. In that case, the any associations for
the configuration file are removed from the registry, whether or
not the package name matches. This action is idempotent, asking
for an association to be purged multiple times does not result
in an error, since attempting to remove an non-existent associa‐
tion is silently ignored unless the –verbose option is used (in
which case it just issues a diagnostic).

-v, –verbose
Make the script be very verbose about setting internal vari‐

-f, –force
This option forces operations requested even if the configura‐
tion file in consideration is owned by another package. This
allows a package to hijack a configuration file from another
package, or to purge the association between the file and some
other package in the registry.

–state-dir /path/to/dir
Set the state directory to /path/to/dir instead of the default
/var/lib/ucf. Used mostly for testing.

The most common case usage is pretty simple: a single line invocation
in the postinst on configure, and another single line in the postrm to
tell ucfr to forget about the association with the configuration file
on purge (using the –purge option) is all that is needed (assuming
ucfr is still on the system).

/var/lib/ucf/registry, and /var/lib/ucf/registry.X, where X is a small
integer, where previous versions of the registry are stored.


If the package foo wants to use ucfr to associate itself with a config‐
uration file foo.conf, a simple invocation of ucfr in the postinst file
is all that is needed:

ucfr foo /etc/foo.conf

On purge, one should tell ucf to forget about the file (see detailed
examples in /usr/share/doc/examples):

ucfr –purge foo /etc/foo.conf


ucf, ucf.conf(5).


This manual page was written Manoj Srivastava ,
for the Debian GNU/Linux system.

Debian Apr 11 2006 UCFR(1)

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