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.Dd May 7, 2012
.Dt DEVELOPMENT 7
.Os
.Sh NAME
.Nm development
.Nd quick starter for development with the DragonFly codebase
.Sh DESCRIPTION
.Dx
uses the
.Xr git 1
distributed revision control system.
If it is not already on the system, it needs to be installed via
.Xr pkgsrc 7
.Pa ( /usr/pkgsrc/devel/scmgit ) .
.Pp
The
.Sx EXAMPLES
section gives initial information to get going with development on
.Dx .
Please refer to the
.Xr git 1
manual pages and other related documents for further information on git's
capabilities and how to use them.
The
.Sx SEE ALSO
section below has some links.
.Pp
For information on how to build the
.Dx
system from source code, see
.Xr build 7 .
For information on how to build the LiveCD, LiveDVD or thumb drive image, see
.Xr release 7 .
.Pp
For a specification of
.Dx Ap s
preferred source code style, refer to
.Xr style 9 .
An
.Xr emacs 1
function to switch C-mode to this style (more or less) can be found in
.Pa /usr/share/misc/dragonfly.el .
.Sh EXAMPLES
A fresh copy of the repository can be cloned anywhere.
Note that the directory to clone into
.Pa ( /usr/src
in the following example) must not exist, so all previous work in this
directory has to be saved and the directory be removed prior to cloning.
Also note that while the main repository is on
.Pa crater ,
it is recommended that one of the
.Dx
mirrors be used instead.
.Pp
Simple setup and updating of local repository is done using
.Pa /usr/Makefile :
.Bd -literal -offset 4n
cd /usr
make help		# get help
make src-checkout	# initial setup
make src-update
.Ed
.Pp
Somewhat finer control can be achieved using
.Xr git 1
directly.
To clone the repository and check out the master branch (this will take
some time):
.Bd -literal -offset 4n
cd /usr
git clone -o crater git://crater.dragonflybsd.org/dragonfly.git src
cd src
.Ed
.Pp
The repository can be held up to date by pulling frequently (to set up a
.Xr cron 8
job,
.Xr git 1 Ap s
.Fl Fl git-dir
option can be used):
.Bd -literal -offset 4n
cd /usr/src
git pull
.Ed
.Pp
It is not recommended to work directly in the master branch.
To create and checkout a working branch:
.Bd -literal -offset 4n
git checkout -b work
.Ed
.Pp
To create and checkout a branch of the
.Dx 2.0
release (called
.Sy rel2_0 ) :
.Bd -literal -offset 4n
git checkout -b rel2_0 crater/DragonFly_RELEASE_2_0
.Ed
.Pp
Branches can be deleted just as easy:
.Bd -literal -offset 4n
git branch -d work
.Ed
.Pp
After changes have been made to a branch, they can be committed:
.Bd -literal -offset 4n
git commit -a
.Ed
.Pp
.Xr git-commit 1 Ap s
.Fl m
and
.Fl F
options can be used to specify a commit message on the command line or read
it from a file, respectively.
.Pp
Finally, branches can be merged with the (updated) master by using
.Cm rebase :
.Bd -literal -offset 4n
git checkout master
git pull
git checkout work
git rebase master
.Ed
.Sh VENDOR IMPORTS
When importing vendor sources, make sure that you don't import
too many unnecessary sources.
Especially test suites that are not used by the
.Dx
build are good candidates for being stripped away.
These instructions assume that you have already extracted
the source package into its final directory and that they are
trimmed appropriately.
.Pp
.Em \&Do not change the vendor sources before importing them
on the vendor branch!
Necessary changes to the vendor sources can be applied to
.Pa master
after the import.
.Pp
For the following commands, we will import the imaginary package
.Nm foo-2.3
into
.Pa /usr/src/contrib/foo .
If this is the first import of
.Nm foo ,
you will have to choose the name of the vendor branch.
Customarily, this will be
.Pa vendor/FOO .
However, if you intend to maintain multiple vendor sources for the
same package
.Em concurrently ,
you should choose a branch name which includes part of the version,
i.e.\&
.Pa vendor/FOO2 .
.Pp
As a first step, we trick git to work on the vendor branch instead of on
.Pa master .
Be careful, since after issuing this command all your commits will go to the
vendor branch, but you will commit
.Em the whole working tree
and not just the vendor sources!
Thus you have to specify the exact directory for
.Li git commit .
In order to commit, you will have to add the new sources first.
.Pp
If the vendor branch already exists, make sure that you have a local vendor
branch which is up to date.
To this end, run:
.Bd -literal -offset 4n
git update-ref refs/heads/vendor/FOO origin/vendor/FOO
.Ed
.Pp
The next commands perform the actual import.
.Bd -literal -offset 4n
git symbolic-ref HEAD refs/heads/vendor/FOO
git add contrib/foo
git commit -m "Import foo-2.3" contrib/foo
.Ed
.Pp
With these commands we have imported the vendor sources on their own branch.
In the next step, we merge the vendor branch into master.
.Bd -literal -offset 4n
git checkout master
git merge vendor/FOO
.Ed
.Pp
Now you are free to change the sources in contrib/foo, since you are
back on the
.Pa master
branch.
The first thing to do is to add
.Pa README.DRAGONFLY
and
.Pa README.DELETED .
The former documents how the imported sources can be obtained, including
a checksum of the tarball.
The latter lists all files and directories that have been removed from the
source package.
You should use the
.Pa /usr/src/tools/tools/genreadmedeleted/genreadmedeleted
shell script to generate this file.
Commit the
.Pa README Ns s
first, then commit your local changes to the sources:
.Bd -literal -offset 4n
git add contrib/foo/README.D*
git commit -m "foo: add our READMEs"
.Ed
.Pp
Finally, push master and the vendor branch to crater:
.Bd -literal -offset 4n
git push crater master vendor/FOO
.Ed
.Sh SEE ALSO
.Xr git 1 Pq Pa pkgsrc/devel/scmgit ,
.Xr build 7 ,
.Xr committer 7 ,
.Xr release 7
.Rs
.%T "Documentation on git's page"
.%O "http://git-scm.com/documentation"
.Re
.Rs
.%T "Git Magic"
.%O "http://www-cs-students.stanford.edu/~blynn/gitmagic/"
.Re
.Sh HISTORY
The
.Nm
manual page was originally written by
.An Matthew Dillon Aq dillon@FreeBSD.org
and first appeared
in
.Fx 5.0 ,
December 2002.
It was rewritten when
.Dx
switched to
.Xr git 1 .