185 lines
4.9 KiB
Groff
185 lines
4.9 KiB
Groff
.\"
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.\" FreeBSD install - a package for the installation and maintainance
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.\" of non-core utilities.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" Jordan K. Hubbard
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.\"
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.\"
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.\" @(#)pkg_delete.8
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.\"
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.Dd November 25, 1994
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.Dt pkg_delete 8
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.Os FreeBSD 2.0
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.Sh NAME
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.Nm pkg_delete
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.Nd a utility for deleting previously installed software package distributions.
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.Sh SYNOPSIS
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.Nm
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.Op Fl vDdnf
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.Op Fl p Ar prefix
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.Ar pkg-name ...
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.Sh DESCRIPTION
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The
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.Nm
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command is used to delete packages that have been previously installed
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with the
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.Xr pkg_add 8
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command.
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.Sh WARNING
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.Bf -emphasis
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Since the
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.Nm
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command may execute scripts or programs provided by a package file,
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your system may be susceptible to ``trojan horses'' or other subtle
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attacks from miscreants who create dangerous package files.
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.Pp
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You are advised to verify the competence and identity of those who
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provide installable package files. For extra protection, examine all
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the package control files in the package record directory (
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.Pa /var/db/pkg/<pkg-name>/ ).
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Pay particular
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attention to any +INSTALL, +DEINSTALL, +REQUIRE or +MTREE_DIRS files,
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and inspect the +CONTENTS file for
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.Cm @cwd ,
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.Cm @mode
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(check for setuid),
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.Cm @dirrm ,
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.Cm @exec ,
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and
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.Cm @unexec
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directives, and/or use the
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.Xr pkg_info 1
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command to examine the installed package control files.
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.Ef
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.Sh OPTIONS
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The following command line options are supported.
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.Bl -tag -width indent
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.It Ar pkg-name ...
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The named packages are deinstalled.
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.It Fl v
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Turns on verbose output.
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.Em "Optional."
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.It Fl D
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If a deinstallation script exists for a given package, do not execute it.
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.Em "Optional."
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.It Fl n
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Don't actually deinstall a package, just report the steps that
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would be taken if it were.
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.Em "Optional."
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.It Fl p Ar prefix
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Sets
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.Ar prefix
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as the directory in which to delete files from any installed packages
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which do not explicitly set theirs. For most packages, the prefix will
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be set automatically to the installed location by
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.Xr pkg_add 8 .
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.Em "Optional."
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.It Fl d
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Remove empty directories created by file cleanup. By default, only
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files/directories explicitly listed in a package's contents (either as
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normal files/directories or with the
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.Cm @dirrm
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directive) will be removed at deinstallation time. This option tells
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.Nm
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to also remove any directories that were emptied as a result of removing
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the package.
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.Em "Optional."
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.It Fl f
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Force removal of the package, even if a dependency is recorded or the
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deinstall or require script fails.
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.Em "Optional."
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.El
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.Pp
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.Sh TECHNICAL DETAILS
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.Nm
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does pretty much what it says. It examines installed package records in
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.Pa /var/db/pkg/<pkg-name> ,
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deletes the package contents, and finally removes the package records.
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.Pp
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If a package is required by other installed packages,
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.Nm
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will list those dependent packages and refuse to delete the package
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(unless the
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.Fl f
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option is given).
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.Pp
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If the package contains a
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.Ar require
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file (see
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.Xr pkg_create 8 ),
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then this is executed first as
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.Bd -filled -offset indent -compact
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.Cm require
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.Ar <pkg-name>
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.Ar DEINSTALL
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.Ed
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(where
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.Ar pkg-name
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is the name of the package in question and
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.I DEINSTALL
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is a keyword denoting that this is a deinstallation)
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to see whether or not deinstallation should continue. A non-zero exit
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status means no, unless the
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.Fl f
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option is specified.
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.Pp
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If a
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.Cm deinstall
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script exists for the package, it is executed before any files are removed.
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It is this script's responsibility to clean up any additional messy details
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around the package's installation, since all
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.Nm
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knows how to do is delete the files created in the original distribution.
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The
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.Nm deinstall
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script is called as:
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.Bd -filled -offset indent -compact
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.Cm deinstall
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.Ar <pkg-name>
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.Ar DEINSTALL
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.Ed
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Passing the keyword
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.Ar DEINSTALL
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lets you potentially write only one program/script that handles all
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aspects of installation and deletion.
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.Pp
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All scripts are called with the environment variable
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.Ev PKG_PREFIX
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set to the installation prefix (see the
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.Fl p
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option above). This allows a package author to write a script
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that reliably performs some action on the directory where the package
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is installed, even if the user might have changed it by specifying the
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.Fl p
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option when running
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.Nm
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or
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.Cm pkg_add .
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.Sh SEE ALSO
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.Xr pkg_info 1 ,
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.Xr mktemp 3 ,
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.Xr mtree 8 ,
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.Xr pkg_add 8 ,
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.Xr pkg_create 8 .
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.Sh AUTHORS
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.Bl -tag -width indent -compact
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.It "Jordan Hubbard"
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most of the work
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.It "John Kohl"
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refined it for NetBSD
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.El
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.Sh BUGS
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Sure to be some.
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