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DEVELOPMENT(7) Miscellaneous Information Manual DEVELOPMENT(7)

development — quick starter for development with the DragonFly codebase

DragonFly uses the git(1) distributed revision control system. If it is not already on the system, it needs to be installed via dports(7) (devel/git).

The EXAMPLES section gives initial information to get going with development on DragonFly. Please refer to the git(1) manual pages and other related documents for further information on git's capabilities and how to use them. The SEE ALSO section below has some links.

For information on how to build the DragonFly system from source code, see build(7). For information on how to build the LiveCD, LiveDVD or thumb drive image, see release(7).

For a specification of DragonFly's preferred source code style, refer to style(9). An emacs(1) function to switch C-mode to this style (more or less) can be found in /usr/share/misc/dragonfly.el. For vim(1) users, a /usr/share/misc/dragonfly.vim is available.

A fresh copy of the repository can be cloned anywhere. Note that the directory to clone into (/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 crater, it is recommended that one of the DragonFly mirrors be used instead.

Simple setup of the local repository is done using /usr/Makefile:

cd /usr
make help		# get brief help
make src-create		# create the source repository

Somewhat finer control can be achieved using git(1) directly. To clone the repository and check out the master branch (this will take some time):

cd /usr
git clone -o crater git://crater.dragonflybsd.org/dragonfly.git src
cd src

The repository can be held up to date by pulling frequently (to set up a cron(8) job, git(1)'s --git-dir option can be used):

cd /usr/src
git pull

It is not recommended to work directly in the master branch. To create and checkout a working branch:

git checkout -b work

To create and checkout a branch of the DragonFly 2.0 release (called ):

git checkout -b rel2_0 crater/DragonFly_RELEASE_2_0

Branches can be deleted just as easy:

git branch -d work

After changes have been made to a branch, they can be committed:

git commit -a

git-commit(1)'s -m and -F options can be used to specify a commit message on the command line or read it from a file, respectively.

Finally, branches can be merged with the (updated) master by using rebase:

git checkout master
git pull
git checkout work
git rebase master

When importing vendor sources, make sure that you don't import too many unnecessary sources. Especially test suites that are not used by the DragonFly 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.

on the vendor branch! Necessary changes to the vendor sources can be applied to master after the import.

For the following commands, we will import the imaginary package foo-2.3 into /usr/src/contrib/foo. If this is the first import of foo, you will have to choose the name of the vendor branch. Customarily, this will be vendor/FOO. However, if you intend to maintain multiple vendor sources for the same package , you should choose a branch name which includes part of the version, i.e. vendor/FOO2.

As a first step, we trick git to work on the vendor branch instead of on master. Be careful, since after issuing this command all your commits will go to the vendor branch, but you will commit and not just the vendor sources! Thus you have to specify the exact directory for git commit. In order to commit, you will have to add the new sources first.

If the vendor branch already exists, make sure that you have a local vendor branch which is up to date. To this end, run:

git update-ref refs/heads/vendor/FOO origin/vendor/FOO

The next commands perform the actual import.

git symbolic-ref HEAD refs/heads/vendor/FOO
git add contrib/foo
git commit -m "Import foo-2.3" contrib/foo

With these commands we have imported the vendor sources on their own branch. In the next step, we merge the vendor branch into master.

git checkout master
git merge vendor/FOO

Now you are free to change the sources in contrib/foo, since you are back on the master branch. The first thing to do is to add README.DRAGONFLY and 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 /usr/src/tools/tools/genreadmedeleted/genreadmedeleted shell script to generate this file. Commit the READMEs first, then commit your local changes to the sources:

git add contrib/foo/README.D*
git commit -m "foo: add our READMEs"

Finally, push master and the vendor branch to crater:

git push crater master vendor/FOO

git(1) (devel/git), build(7), committer(7), release(7)

Documentation on git's page, http://git-scm.com/documentation.

Git Magic, http://www-cs-students.stanford.edu/~blynn/gitmagic/.

The development manual page was originally written by Matthew Dillon <dillon@FreeBSD.org> and first appeared in FreeBSD 5.0, December 2002. It was rewritten when DragonFly switched to git(1).

August 7, 2018 DragonFly-5.6.1