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Chapter 8. Advanced pkg-plist Practices
Advanced [.filename]#pkg-plist# Practices
Changing [.filename]#pkg-plist# Based on Make Variables
Some ports, particularly the `p5-` ports, need to change their [.filename]#pkg-plist# depending on what options they are configured with (or version of `perl`, in the case of `p5-` ports). To make this easy, any instances in [.filename]#pkg-plist# of `%%OSREL%%`, `%%PERL_VER%%`, and `%%PERL_VERSION%%` will be substituted appropriately. The value of `%%OSREL%%` is the numeric revision of the operating system (for example, `4.9`). `%%PERL_VERSION%%` and `%%PERL_VER%%` is the full version number of `perl` (for example, `5.8.9`). Several other `%%_VARS_%%` related to port's documentation files are described in <<install-documentation,the relevant section>>.
To make other substitutions, set `PLIST_SUB` with a list of `_VAR=VALUE_` pairs and instances of `%%_VAR_%%` will be substituted with _VALUE_ in [.filename]#pkg-plist#.
For instance, if a port installs many files in a version-specific subdirectory, use a placeholder for the version so that [.filename]#pkg-plist# does not have to be regenerated every time the port is updated. For example:
in the [.filename]#Makefile# and use `%%OCTAVE_VERSION%%` wherever the version shows up in [.filename]#pkg-plist#. When the port is upgraded, it will not be necessary to edit dozens (or in some cases, hundreds) of lines in [.filename]#pkg-plist#.
If files are installed conditionally on the options set in the port, the usual way of handling it is prefixing [.filename]#pkg-plist# lines with a `%%OPT%%` for lines needed when the option is enabled, or `%%NO_OPT%%` when the option is disabled, and adding `OPTIONS_SUB=yes` to the [.filename]#Makefile#. See <<options_sub,`OPTIONS_SUB`>> for more information.
For instance, if there are files that are only installed when the `X11` option is enabled, and [.filename]#Makefile# has:
In [.filename]#pkg-plist#, put `%%X11%%` in front of the lines only being installed when the option is enabled, like this :
This substitution will be done between the `pre-install` and `do-install` targets, by reading from [.filename]#PLIST# and writing to [.filename]#TMPPLIST# (default: [.filename]#WRKDIR/.PLIST.mktmp#). So if the port builds [.filename]#PLIST# on the fly, do so in or before `pre-install`. Also, if the port needs to edit the resulting file, do so in `post-install` to a file named [.filename]#TMPPLIST#.
Another way of modifying a port's packing list is based on setting the variables `PLIST_FILES` and `PLIST_DIRS`. The value of each variable is regarded as a list of pathnames to write to [.filename]#TMPPLIST# along with [.filename]#PLIST# contents. While names listed in `PLIST_FILES` and `PLIST_DIRS` are subject to `%%_VAR_%%` substitution as described above, it is better to use the `${_VAR_}` directly. Except for that, names from `PLIST_FILES` will appear in the final packing list unchanged, while `@dir` will be prepended to names from `PLIST_DIRS`. To take effect, `PLIST_FILES` and `PLIST_DIRS` must be set before [.filename]#TMPPLIST# is written, that is, in `pre-install` or earlier.
From time to time, using `OPTIONS_SUB` is not enough. In those cases, adding a specific `_TAG_` to `PLIST_SUB` inside the [.filename]#Makefile# with a special value of `@comment`, makes package tools to ignore the line. For instance, if some files are only installed when the `X11` option is on and the architecture is `i386`:
.include <bsd.port.pre.mk>
.if ${PORT_OPTIONS:MX11} && ${ARCH} == "i386"
PLIST_SUB+= X11I386=""
PLIST_SUB+= X11I386="@comment "
Empty Directories
Cleaning Up Empty Directories