Developer Infos

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Contents

Overview

Netatalk source code is now hosted in a shared git repository to which only Netatalk Team members are allowed to push into.

Links to Developer Ressources

Git Installation

The examples in the following sections are based off of the tools and syntax used by git v1.5.3 or later. Either apt-get, yum, or make install the tools. See Git documentation for more details on this part. Note that under Debian or Ubuntu, git is distributed in the git-core package. The git package contains the "GNU Interactive Tools".

Main Netatalk Branches

Basic Netatalk Git

The master git repository is located at git://netatalk.git.sourceforge.net/gitroot/netatalk/netatalk. There is also a GitWeb installation.

Step Zero is to set your name and email address for commits:

 $ git config --global user.email Your.Email@domain.com
 $ git config --global user.name "Your Real Name"

Next, clone the repository:

 $ git clone git://netatalk.git.sourceforge.net/gitroot/netatalk/netatalk
 Initialized empty Git repository in /home/frank/test/.git/
 remote: Counting objects: 31503, done.
 remote: Compressing objects: 100% (11427/11427), done.
 remote: Total 31503 (delta 24830), reused 25450 (delta 19869)
 Receiving objects: 100% (31503/31503), 6.52 MiB | 2.38 MiB/s, done.
 Resolving deltas: 100% (24830/24830), done.
 $ cd netatalk

List local and remote branches:

  $ git branch
    * master

  $ git branch -r
  origin/branch-netatalk-2-0
  origin/branch-netatalk-2-1
  origin/branch-netatalk-2-2
  origin/branch-netatalk-3-0
  origin/branch-netatalk-3-1
  origin/master

Creating your own working branch from master:

 $ git checkout -b my_branch
 Branch my_branch set up to track remote branch refs/remotes/origin/develop.
 Switched to a new branch "my_branch"

Do your own local work:

 $ mkdir git-test
 $ echo "hello" > git-test/README

View status of changes

 $ git status
 # On branch my_branch
 # Untracked files:
 #   (use "git add <file>..." to include in what will be committed)
 # 
 #       git-test/
 nothing added to commit but untracked files present (use "git add" to track)

Add our new file to the local branch index:

 $ git add git-test
 $ git status
 # On branch my_branch
 # Changes to be committed:
 #   (use "git reset HEAD <file>..." to unstage)
 #
 #       new file:   git-test/README
 #

Commit changes

 $ git commit -m "Example file for HOWTO"
 Created commit ad9a1eb: Example file for HOWTO
  1 files changed, 1 insertions(+), 0 deletions(-)
  create mode 100644 git-test/README

Do some more work and commit local changes....

Now fetch the remote branch history:

 $ git fetch

To present your patchset properly to other developers, please rebase your patches against the branch you are developing against:

 $ git rebase origin/master

Obviously replace "origin/master" by whatever branch you are developing against. If you have created a mess in your local patch queue, "git rebase -i" might help you out.

Creating patches

Assuming your patches are the last three commits on your current local git branch, this is the easiest way to create patches from them:

 $ git format-patch -3

This will create three patch files in your current directory that you can then send to the samba-technical mailing list.

Note that if you have a number of patches against a specific branch and don't feel like counting them, the following works as well (e.g. against the develop branch):

 $ git format-patch origin/develop

This will create one patch file for every patch that is in your local branch but not in origin/develop.

If you have more patches which belong together it's sometimes useful to export them into one file:

 $ git format-patch --stdout origin/develop > develop-featureX-01.patches.txt

Debugging process crashes

We need a stack-backtrace (SBT) from a corefile with debugging symbols.

 CFLAGS="-g -O0" ./configure ... && make && make install
 ulimit -c unlimited

at the beginning of the Netatalk start script and restart Netatalk.

 $ gdb path/to/afpd path/to/corefile
 (gdb) bt full
 ...
 (gdb) exit

ABI checking

Since libatalk is now a shared library the autotools build system has been extended to do some ABI checking. A helper script abigen.sh is used to generate a symbol file containing all exported symbols of the dynamic libatalk library. These symbol files are named libatalk-VERSION.abi and are stored inside the libatalk source directory.

Every time make runs inside libatalk a symbol file libatalk.abi.tmp is autogenerated and checked against the current copy of the file matching the configured VERSION (as contained in the file VERSION). If there are any differences found, make aborts and the developer must update the symbol file and libatalk/Makefile.am library version info accordingly.

Making a release

Developers doing releases are expected to have a working understanding of the ABI checking infrastructure and must use the --enable-developer configure option.

 $ vi VERSION
 $ git commit -a -m "Bump version to x.x.x"
 $ vi NEWS
 $ git commit -a -m "Update NEWS"
 $ ./configure ...
 $ make clean && make
 ...
 make[3]: Entering directory `/home/frank/netatalk/develop/libatalk'
 **********************************************************************************************************
                                 created ABI file libatalk-3.0beta2.abi
     check https://sourceforge.net/apps/mediawiki/netatalk/index.php?title=Developer_Infos#ABI_checking
 **********************************************************************************************************
 make[3]: *** [all-local] Error 1
 ...
 $ git status
 # On branch release-3.0beta2
 # Untracked files:
 #   (use "git add <file>..." to include in what will be committed)
 #
 #	libatalk/libatalk-3.0beta2.abi
 nothing added to commit but untracked files present (use "git add" to track)
 $ git add libatalk/libatalk-3.0beta2.abi
 $ git commit -m "Import libatalk-3.0-beta2 ABI file"
 $ emacs libatalk/Makefile.am
 ...
 $ ./bootstrap && ./configure ... (ensure the Makefile.am change takes effect) && make

This make run should now pass without error.

Update VERSION_INFO as necessary, update libatalk/Makefile.am version history. Note that VERSION_INFO info might already have been updated by the ongoing ABI checks by a developer when working on develop.

 $ git diff
 @@ -28,6 +26,7 @@ VERSION_INFO = 1:0:0
  #   3.0.0-alpha2    0:0:0
  #   3.0.0-alpha3    0:0:0
  #   3.0.0-beta1     0:0:0
 +#   3.0.0-beta2     1:0:0
  
  SUBDIRS = acl adouble bstring compat cnid dsi iniparser tdb util unicode vfs
  
 @@ -85,3 +84,4 @@ all-local: .libs/libatalk.so
 
  EXTRA_DIST = \
         libatalk-3.0beta1.abi \
 +       libatalk-3.0beta2.abi

If you have to update VERSION_INFO again, commit the change, rebootstrap and configure.

 $ make html
 $ git commit -a -m "Generate manpages from XML"
 $ cd doc/
 doc/ $ vi www/ReleaseNotes
 doc/ $ git commit -a -m "Update release notes"
 doc/ $ USER=netatalk-sourceforge-adminuser make upload-release-notes
 $ git tag TAG
 $ git push SOURCEFORGE-GIT-REPO TAG
 $ make dist
 $ make dist-bzip2
 $ cd doc/manual/
 doc/manual/ $ USER=netatalk-sourceforge-adminuser make html-upload

FAQ

Q. How do I revert a commit?

A. The "git reset" command allows you to reset the HEAD of the branch to any given point in history. To go back one commit, run "git reset HEAD^". This will keep your local changes and you can make any additional changes before re-commiting the new work. Also see the "git commit --amend" command and the "git reset" man page for other examples.


Q. How can I maintain a feature branch against the upstream Netatalk branches?

A. You clone the Netatalk repository as per the instructions above. Then you make a new feature branch:

$ git checkout -b feature_foo master

Now you do your development in your feature branch. Any time the master branch gets too different to the code in your feature branch you should rebase your feature branch. The rebase rewinds your feature branch to the point there it was branched. Then it updates you feature branch to the HEAD of the master branch and re-applies your changes.

$ git rebase master
First, rewinding head to replay your work on top of it...
HEAD is now at 357f003... Add WERR_SERVICE_ALREADY_RUNNING.
...
Wrote tree 02299ef7c1cfa093248bfd9c6e3812805718845e
Committed: e20a8c521d7860d9b7bd724ed5ea19c7306530ab

Rebase works best when you use it for local branches that are never pushed to a public repository, see Why won't "git push" work after I rebased a branch?.

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