There are some tricks we have not mentioned yet about the
pkg-* files
that come in handy sometimes.
If you need to display a message to the installer, you may place
the message in pkg-message. This capability is
often useful to display additional installation steps to be taken
after a pkg_add(1) or to display licensing
information.
When some lines about the build-time knobs or warnings
have to be displayed, use ECHO_MSG. The
pkg-message file is only for
post-installation steps. Likewise, the distinction between
ECHO_MSG and ECHO_CMD
should be kept in mind. The former is for printing
informational text to the screen, while the latter is for
command pipelining.
A good example for both can be found in
shells/bash2/Makefile:
update-etc-shells:
@${ECHO_MSG} "updating /etc/shells"
@${CP} /etc/shells /etc/shells.bak
@( ${GREP} -v ${PREFIX}/bin/bash /etc/shells.bak; \
${ECHO_CMD} ${PREFIX}/bin/bash) >/etc/shells
@${RM} /etc/shells.bakThe pkg-message file does not need to be
added to pkg-plist. Also, it will not get
automatically printed if the user is using the port, not the
package, so you should probably display it from the
post-install target yourself.
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