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<!-- $FreeBSD$ -->
<!-- The FreeBSD Documentation Project -->
<chapt><heading>Source Tree Guidelines and Policies
<label id="policies">
</heading>
<p><em>Contributed by &a.phk;.</em>
This chapter documents various guidelines and policies in force
for the FreeBSD source tree.
<sect><heading>MAINTAINER on Makefiles
<label id="policies:maintainer">
</heading>
<p>June 1996.
<p>If a particular portion of the FreeBSD distribution is being maintained by a
person or group of persons, they can communicate this fact to the
world by adding a
<verb>
MAINTAINER= email-addresses
</verb>
<p>line to the makefiles covering this portion of the source tree.
<p>The semantics of this are as follows:
<p>The maintainer owns and is responsible for that code. This means
that he is responsible for fixing bugs and answer problem reports
pertaining to that piece of the code, and in the case of contributed
software, for tracking new versions, as appropriate.
<p>Changes to directories which have a maintainer defined shall be
sent to the
maintainer for review before being committed. Only if the maintainer does not respond
for an unacceptable period of time, to several emails, will it be
acceptable to commit changes without review by the maintainer.
However, it is suggested that you try and have the changes reviewed
by someone else if at all possible.
<p>It is of course not acceptable to add a person or group as maintainer
unless they agree to assume this duty. On the other hand it doesn't
have to be a committer and it can easily be a group of people.
<sect><heading>Contributed software</heading>
<p>June 1996.
<p>Some parts of the FreeBSD distribution consist of software that
is actively being maintained outside the FreeBSD project. For
historical reasons, we call this <em>contributed</em> software. Some
examples are perl, gcc and patch.
<p>Over the last couple of years, various methods have been used in
dealing with this type of software and all have some number of
advantages and drawbacks. No clear winner has emerged.
<p>Since this is the case, after some debate one of these methods has
been selected as the "official" method and will be required for
future imports of software of this kind. Furthermore, it is strongly
suggested that existing contributed software converge on this model
over time, as it has significant advantages over the old method,
including the ability to easily obtain diffs relative to the
"official" versions of the source by everyone (even without cvs
access). This will make it significantly easier to return changes
to the primary developers of the contributed software.
<p>Ultimately, however, it comes down to the people actually doing
the work. If using this model is particularly unsuited to the
package being dealt with, exceptions to these rules may be granted
only with the approval of the core team and with the general
consensus of the other developers. The ability to maintain the
package in the future will be a key issue in the decisions.
<p>The <tt>Tcl</tt> embedded programming language will be used as example
of how this model works:
<p><verb>src/contrib/tcl</verb> contains the source as distributed by the maintainers
of this package. Parts that are entirely not applicable for FreeBSD
can be removed. In the case of Tcl, the "mac", "win" and "compat"
subdirectories were eliminated before the import
<p><verb>src/lib/libtcl</verb> contains only a "bmake style" Makefile that uses
the standard bsd.lib.mk makefile rules to produce the library and
install the documentation.
<p><verb>src/usr.bin/tclsh</verb> contains only a bmake style Makefile which will
produce and install the "tclsh" program and its associated man-pages
using the standard bsd.prog.mk rules.
<p><verb>src/tools/tools/tcl_bmake</verb> contains a couple of shell-scripts that can be of help
when the tcl software needs updated, these are not part of the
build or installed software.
<p>The important thing here is that the "src/contrib/tcl" directory
is created according to the rules: It is supposed to contain the
sources as distributed (on a proper CVS vendor-branch) with as few
FreeBSD-specific changes as possible. The 'easy-import' tool on
freefall will assist in doing the import, but if there are any
doubts on how to go about it, it is imperative that you ask first
and not blunder ahead and hope it "works out". CVS is not forgiving
of import accidents and a fair amount of effort is required to back
out major mistakes.
<p>Because of some unfortunate design limitations with CVS's vendor
branches, it is required that "official" patches from the vendor
be applied to the original distributed sources and the result
re-imported onto the vendor branch again. Official patches should
never be patched into the FreeBSD checked out version and
"committed", as this destroys the vendor branch coherency and makes
importing future versions rather difficult as there will be conflicts.
<p>Since many packages contain files that are meant for compatibility
with other architectures and environments that FreeBSD, it is
permissible to remove parts of the distribution tree that are of no interest
to FreeBSD in order to save space. Files containing copyright
notices and release-note kind of information applicable to the
remaining files shall <em>not</em> be removed.
<p>If it seems easier, the "bmake" makefiles can be produced from the
dist tree automatically by some utility, something which would
hopefully make it even easier to upgrade to a new version. If this
is done, be sure to check in such utilities (as necessary) in the
src/tools directory along with the port itself so that it is available
to future maintainers.
<p>In the src/contrib/tcl level directory, a file called README.FreeBSD
should be added and it should states things like:
<itemize>
<item> Which files have been left out
<item> Where the original distribution was obtained from and/or the official
master site.
<item> Where to send patches back to the original authors
<item> Perhaps an overview of the FreeBSD-specific changes that have been made.
</itemize>
<sect><heading>Shared libraries
<label id="policies:shlib">
</heading>
<p><em>Contributed by &a.asami;, &a.peter;, and &a.obrien;.
<newline>9 December 1996.</em></p>
<p>If you are adding shared library support to a port or other piece
of software that doesn't have one, the version numbers should
follow these rules. Generally, the resulting numbers will have
nothing to do with the release version of the software.
<p>The three principles of shared library building are:
<itemize>
<item>Start from 1.0
<item>If there is a change that is backwards compatible, bump
minor number
<item>If there is an incompatible change, bump major number
</itemize>
<p>For instance, added functions and bugfixes result in the minor
version number being bumped, while deleted functions, changed
function call syntax etc. will force the major version number
to change.
<p>Stick to version numbers of the form major.minor (x.y). Our dynamic
linker does not handle version numbers of the form x.y.z well. Any
version number after the ``y'' (ie. the third digit) is totally ignored
when comparing shared lib version numbers to decide which library to
link with. Given two shared libraries that differ only in the `micro'
revision, ld.so will link with the higher one. Ie: if you link with
libfoo.so.3.3.3, the linker only records 3.3 in the headers, and will
link with anything starting with libfoo.so.3.(anything >= 3).(highest
available).
<p>Note that ld.so will always use the highest "minor" revision.
Ie: it will use libc.so.2.2 in preference to libc.so.2.0, even if the
program was initially linked with libc.so.2.0.
<p>For non-port libraries, it is also our policy to change the
shared library version number only once between releases. When
you make a change to a system library that requires the version
number to be bumped, check the Makefile's commit logs. It is the
responsibility of the committer to ensure that the first such
change since the release will result in the shared library version
number in the Makefile to be updated, and any subsequent changes
will not.
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