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Package Tasks
=============
*pkgtasks* is a shell script library to ease writing POSIX-compliant shell
scripts to handle common tasks during installation or removal of a package,
e.g.,
* creating groups and users needed by the package
* creating and removing directories with special permissions and
ownership,
* copying example config files to their final locations during package
installation, and removing them during package removal if they don't
differ from the example ones,
* reminding the user of files that may be customized after package
installation.
Package tasks have the property of *idempotence* -- they may be invoked
multiple times, but the result must be the same as when invoked once, e.g.,
the `shells` task adds an entry to /etc/shells, but will avoid adding the
same entry more than once.
Getting sources
---------------
The latest version of *pkgtasks* is 1.10 and was released on June 3rd, 2017.
See the [release notes](NEWS.md) for information about the changes in this
and all previous releases.
Documentation
-------------
A script may load task modules to define shell functions to perform
various tasks. A task module is loaded in a POSIX-compliant shell script
by adding the following boilerplate to the script:
# Import the task loader.
: ${TASK_MODULE_DIR:=/usr/pkg/share/pkgtasks-1}
. "${TASK_MODULE_DIR}/load.subr"
# Load task modules.
task_load preinstall
The individual package tasks supported by *pkgtasks* are:
* `directories`: create and remove directories outside of package tree
* `files`: copy and remove configuration files
* `fonts`: regenerate X11 font indices
* `groups`: create groups and warn about groups that may be removed
* `info_files`: register and unregister GNU info files
* `ocaml_findlib`: update OCaml findlib search paths
* `permissions`: check and set modes and permissions on special files
* `shells`: register and unregister login shells
* `shlibs`: update the shared library cache
* `users`: create users and warn about users that may be removed
These package tasks support `${PKG_DESTDIR}` to manipulate the correct
filesystem paths for a destdir-installed package.
For convenience, these have been composed into larger meta-tasks:
* `preinstall`: tasks performed before files are installed
* `preremove`: tasks performed before files are removed
* `postinstall`: tasks performed after files are installed
* `postremove`: tasks performed after files are removed
There are also several utility tasks that may be used to write portable
scripts:
* `cleanup`: run functions upon improper exit
* `compare`: compare two files for equality
* `createfile`: create empty files
* `dirwalk`: walk a directory tree using depth-first traversal
* `echo`: write to standard output through a buffer
* `lock`: create or release a lock file
* `makedir`: make a directory hierarchy
* `maketemp`: make unique, temporary files
* `match`: match lines with a fnmatch(3) glob pattern
* `platform`: determine the platform (operating system)
* `quote`: quote strings for use with shell eval
* `random`: generate random numbers (badly)
* `refcount`: reference-count system resources
* `say`: write to standard output with a tag
* `sort`: sort lines from standard input
* `taskfunc`: generic function hook for meta-tasks
* `tee`: duplicate writes to standard output into files
* `truthy`: evaluate truthiness
* `valid_options`: check validity of option strings
* `version`: compare version strings
* `which`: locate a program file in the $PATH
The documentation for each of these tasks is in man-page style in the
header comments for each task module.
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