Проект OpenNet: MAN pkg_delete (1) Команды и прикладные программы пользовательского уровня (FreeBSD и Linux)

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pkg_delete (1)

>> pkg_delete (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )

BSD mandoc

NAME



pkg_delete

 - a utility for deleting previously installed software package distributions

SYNOPSIS

[-dDfGinrvxX ] [-p prefix ] pkg-name ...
-a [flags ]

DESCRIPTION

The command is used to delete packages that have been previously installed with the pkg_add1 command.

WARNING

Bf -emphasis Since the command may execute scripts or programs provided by a package file, your system may be susceptible to ``trojan horses '' or other subtle attacks from miscreants who create dangerous package files.

You are advised to verify the competence and identity of those who provide installable package files. For extra protection, examine all the package control files in the package record directory ( /var/db/pkg/<pkg-name>/ ) Pay particular attention to any +INSTALL, +POST-INSTALL, +DEINSTALL, +POST-DEINSTALL, +REQUIRE or +MTREE_DIRS files, and inspect the +CONTENTS file for @cwd @mode (check for setuid), @dirrm @exec and @unexec directives, and/or use the pkg_info1 command to examine the installed package control files. Ef

OPTIONS

The following command line options are supported:

pkg-name ...: The named packages are deinstalled.
-a , -all: Unconditionally delete all currently installed packages.
-i , -interactive: Request confirmation before attempting to delete each package, regardless whether or not the standard input device is a terminal.
-v , -verbose: Turn on verbose output.
-D , -no-script , -no-scripts: If a deinstallation script exists for a given package, do not execute it.
-n , -dry-run: Do not actually deinstall a package, just report the steps that would be taken if it were.
-p , -prefix prefix: Set prefix as the directory in which to delete files from any installed packages which do not explicitly set theirs. For most packages, the prefix will be set automatically to the installed location by pkg_add1.
-d , -clean-dirs: Remove empty directories created by file cleanup. By default, only files/directories explicitly listed in a package's contents (either as normal files/directories or with the @dirrm directive) will be removed at deinstallation time. This option tells to also remove any directories that were emptied as a result of removing the package.
-f , -force: Force removal of the package, even if a dependency is recorded or the deinstall or require script fails.
-G , -no-glob: Do not try to expand shell glob patterns in the pkg-name when selecting packages to be deleted (by default automatically expands shell glob patterns in the pkg-name )
-x , -regex: Treat the pkg-name as a regular expression and delete all packages whose names match that regular expression. Multiple regular expressions could be provided, in that case deletes all packages that match at least one regular expression from the list.
-X , -extended: Like -x but treats the pkg-name as an extended regular expression.
-r , -recursive: Recursive removal. In addition to specified packages, delete all packages that depend on those packages as well.

TECHNICAL DETAILS

The utility does pretty much what it says. It examines installed package records in /var/db/pkg/<pkg-name> deletes the package contents, and finally removes the package records. If the environment variable PKG_DBDIR is set, this overrides the /var/db/pkg/ path shown above.

If a package is required by other installed packages, will list those dependent packages and refuse to delete the package (unless the -f option is given).

If the package contains a require file (see pkg_create1), then this is executed first as

require <pkg-name> DEINSTALL

(where pkg-name is the name of the package in question and DEINSTALL is a keyword denoting that this is a deinstallation) to see whether or not deinstallation should continue. A non-zero exit status means no, unless the -f option is specified.

If a deinstall script exists for the package, it is executed before any files are removed. It is this script's responsibility to clean up any additional messy details around the package's installation, since all knows how to do is delete the files created in the original distribution. The deinstall script is called as:

script <pkg-name> DEINSTALL

where pkg-name is the name of the package in question and DEINSTALL is a keyword denoting this as the pre-deinstallation phase.

Note The DEINSTALL keyword will not appear if separate scripts for deinstall and post-deinstall are given during package creation time (using the -k and -K flags to pkg_create1).

If a post-deinstall script exists for the package, it is executed after all files are removed. It is this script's responsibility to clean up any additional messy details around the package's installation, and leave the system (hopefully) in the same state that it was prior to the installation of the package.

The post-deinstall script is called as:

script <pkg-name> POST-DEINSTALL

where pkg-name is the name of the package in question and POST-DEINSTALL is a keyword denoting this as the post-deinstallation phase.

Note The POST-DEINSTALL keyword will not appear if separate scripts for deinstall and post-deinstall are given during package creation time (using the -k and -K flags to pkg_create1).

Reasoning behind passing keywords such as DEINSTALL and POST-DEINSTALL is that it lets you potentially write only one program/script that handles all aspects of installation and deletion.

But experience has proved that this is a lot more difficult to maintain and is not as advantageous as having separate scripts that handle each aspect of installation and deinstallation.

All scripts are called with the environment variable PKG_PREFIX set to the installation prefix (see the -p option above). This allows a package author to write a script that reliably performs some action on the directory where the package is installed, even if the user might have changed it by specifying the -p option when running or pkg_add