309 lines
7.9 KiB
Groff
309 lines
7.9 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_add.8
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.\"
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.Dd November 25, 1994
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.Dt pkg_add 8
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.Os FreeBSD 2.0
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.Sh NAME
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.Nm pkg_add
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.Nd a utility for installing software package distributions.
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.Sh SYNOPSIS
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.Nm
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.Op Fl vInfRMS
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.Op Fl t Ar template
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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 extract packages that have been previously created
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with the
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.Xr pkg_create 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 contained within 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, use the
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.Fl M
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flag to extract the package file, and inspect its contents and scripts
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to insure it poses no danger to your system's integrity. 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 package file.
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.Ef
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.Sh OPTIONS
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The following command line arguments are supported.
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.Bl -tag -width indent
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.It Ar pkg-name ...
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Packages in the named files are installed.
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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 I
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If an installation 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 install a package, just report the steps that
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would be taken if it was.
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.Em "Optional."
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.It Fl R
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Do not record the installation of a package. This means
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that you cannot deinstall it later, so only use this option if
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you know what you are doing!
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.Em "Optional."
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.It Fl f
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Forces installation to proceed even if prerequisite packages are not
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installed or the requirements script fails.
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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 extract files from a package.
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If a package has set its default directory, it will be overridden
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by this flag. Note that only the first directory default will
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be replaced, since
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.Nm
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has no way of knowing which directory settings are relative and
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which are absolute. It is rare, in any case, that more than one
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directory transition is made, but when such is the case then you
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may wish to look into the use of
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.Cm MASTER
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and
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.Cm SLAVE
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mode (see the
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.Fl M
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and
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.Fl S
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options).
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.Em "Optional."
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.It Fl t Ar template
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Use
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.Ar template
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as the input to
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.Xr mktemp 3
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when creating a ``staging area.''
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By default, this is the string
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.Pa /tmp/instmp.XXXXXX ,
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but it may be necessary to override it in the situation where
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space in your
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.Pa /tmp
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directory is limited. Be sure to leave some number of `X' characters
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for
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.Xr mktemp 3
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to fill in with a unique ID.
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.Pp
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You can get a performance boost by setting the staging area
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.Ar template
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to reside on the same disk partition as target directories for package
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file installation; often this is
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.Pa /usr .
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.Em "Optional."
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.It Fl M
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Run in
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.Cm MASTER
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mode. This is a very specialized mode for running
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.Nm
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and is meant to be run in conjunction with
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.Cm SLAVE
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mode. When run in this mode,
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.Nm
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does no work beyond extracting the package into a temporary staging
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area (see the
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.Fl t
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option), reading in the packing list, and then dumping it (prefaced by
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the current staging area) to stdout where it may be filtered by a
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program such as
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.Xr sed 1 .
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When used in conjunction with
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.Cm SLAVE
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mode, it allows you to make radical changes to the package structure
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before acting on its contents.
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.It Fl S
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Run in
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.Cm SLAVE
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mode. This is a very specialized mode for running
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.Nm
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and is meant to be run in conjunction with
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.Cm MASTER
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mode. When run in this mode,
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.Nm
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expects the release contents to be already extracted and waiting
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in the staging area, the location of which is read as a string
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from stdin. The complete packing list is also read from stdin,
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and the contents then acted on as normal.
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.El
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.Sh TECHNICAL DETAILS
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.Nm
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is fairly simple. It simply extracts the requested packages into
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a ``staging area'' directory and then performs the following steps:
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.Bl -enum -indent indent
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.It
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It checks whether the package is already recorded as installed; if so,
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the installation terminates.
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.It
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It checks whether all the package dependencies (from
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.Cm @pkgdep
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directives, see
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.Xr pkg_create 8 )
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are met; if not, the missing dependencies are printed and the
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installation terminates.
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.It
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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 INSTALL
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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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.Ar INSTALL
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is a keyword denoting that this is an installation requirements check.
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.It
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If an
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.Ar install
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script exists for the package, it is then executed as
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.Bd -filled -offset indent -compact
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.Cm install
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.Ar <pkg-name>
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.Ar PRE-INSTALL
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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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.Ar PRE-INSTALL
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is a keyword denoting that this is the preinstallation phase.
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.It
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Using the packing list (the
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.Pa +CONTENTS
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file) as a guide, files are then moved (or copied, as necessary) from
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the staging area into their final locations.
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.It
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If the package contains an
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.Ar mtreefile
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file (see the
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.Fl m
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option to
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.Xr pkg_create 8 ),
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then mtree is invoked as
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.Bd -filled -offset indent -compact
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.Cm mtree
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.Fl u
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.Fl f
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.Ar mtreefile
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.Fl d
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.Fl e
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.Fl p
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.Pa prefix
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.Ed
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where
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.Pa prefix
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is either the prefix specified with the
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.Fl p
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flag or, if no
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.Fl p
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flag was specified, the name of the first directory named by a
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.Cm @cwd
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directive within this package.
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.It
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If an
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.Ar install
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script exists for the package, it is then executed as
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.Bd -filled -offset indent -compact
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.Cm <script>
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.Ar <pkg-name>
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.Ar POST-INSTALL
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.Ed
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This all allows you to write a single
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.Ar install
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script that does both ``before and after'' actions.
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.It
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After installation is complete, a copy of the packing list,
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.Ar deinstall
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script, description, and display files are copied into
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.Pa /var/db/pkg/<pkg-name>
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for subsequent possible use by
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.Xr pkg_delete 8 .
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Any package dependencies are recorded in the other packages'
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.Pa /var/db/pkg/<other-pkg>/+REQUIRED_BY
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file.
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.It
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Finally, the staging area is deleted and the program terminates.
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.El
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.Pp
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All the 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 change it with the
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.Fl p
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flag to
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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 sysconf 3 ,
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.Xr mtree 8 ,
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.Xr pkg_create 8 ,
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.Xr pkg_delete 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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Hard links between files in a distribution are only preserved if either
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(1) the staging area is on the same file system as the target directory of
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all the links to the file, or (2) all the links to the file are bracketed by
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.Cm @cwd
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directives in the contents file,
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.Em and
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and the link names are extracted with a single
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.Cm tar
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command (not split between
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invocations due to exec argument-space limitations--this depends on the
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value returned by
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.Xr sysconf _SC_ARG_MAX ).
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.Pp
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Sure to be others.
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