@chapter Working with source code
@warning{New contributors should read @ref{Quick start}, and in
-particular @ref{Using lily-git}, instead of this chapter.}
+particular @ref{lily-git}, instead of this chapter.}
Advanced contributors will find this material quite useful,
particularly if they are working on major new features.
skip ahead to @ref{Starting with Git}.
@warning{These instructions are only for people who are @emph{not}
-using @ref{Lilydev}.}
+using @ref{LilyDev}.}
@c there's some duplication in this section with stuff covered in
@c Quick Start, but moving it into a macro inside included/ would
@end enumerate
@warning{Throughout the rest of this manual, most command-line
-input should be entered from @file{~/lilypond-git/}. This is
+input should be entered from @file{$LILYPOND_GIT}. This is
referred to as the @emph{top source directory}.}
-Further instructions are in @ref{Daily use of lily-git.tcl}.
+Further instructions are in @ref{How to use lily-git}.
@node Starting with Git
@menu
* Setting up::
+* Git for the impatient::
+* Other repositories::
* Downloading remote branches::
@end menu
@subsection Setting up
@warning{These instructions assume that you are using the
-command-line version of Git 1.5 or higher. Windows users should
-skip to @ref{Git on Windows}.}
+command-line version of Git 1.7 or higher.}
@menu
* Installing Git::
@subsubheading Technical details
-This creates (within the @file{~/lilypond-git/} directory) a
+This creates (within the @file{$LILYPOND_GIT} directory) a
subdirectory called @file{.git/}, which Git uses to keep track of
changes to the repository, among other things. Normally you don't
need to access it, but it's good to know it's there.
@warning{Throughout the rest of this manual, all command-line
input should be entered from the top directory of the Git
-repository being discussed (eg. @file{~/lilypond-git/}). This is
+repository being discussed (eg. @file{$LILYPOND_GIT}). This is
referred to as the @emph{top source directory}.}
Before working with the copy of the main LilyPond repository, you
git config --global core.editor @var{nano}
@end example
+Finally, and in some ways most importantly, let's make sure that
+we know what branch we're on. If you're not using LilyDev, add
+this to your @file{~/.bashrc}:
+
+@verbatim
+export PS1="\u@\h \w\$(__git_ps1)$ "
+@end verbatim
+
+If you are not using LilyDev, you may need to install the
+additional @code{git-completion} package, but it is definitely
+worth it.
+
+
@subsubheading Technical details
Git stores the information entered with
in this manual.
-@node Downloading remote branches
-@subsection Downloading remote branches
+@node Git for the impatient
+@subsection Git for the impatient
+@advanced{The intent of this subsection is to get you working on lilypond as
+soon as possible. If you want to learn about git, go read
+@ref{Other Git documentation}.
+@*
+Also, these instructions are designed to eliminate the most common
+problems we have found in using git. If you already know git and
+have a different way of working, great! Feel free to ignore the
+advice in this subsection.}
-@menu
-* Organization of remote branches::
-* LilyPond repository sources::
-* Downloading individual branches::
-* Downloading all remote branches::
-* Other branches::
-@end menu
+Ok, so you've been using @command{lily-git.tcl} for a while, but
+it's time to take the next step. Since our review process delays
+patches by 60-120 hours, and you want to be able to work on other
+stuff while your previous work is getting reviewed, you're going
+to use @strong{branches}.
-@node Organization of remote branches
-@unnumberedsubsubsec Organization of remote branches
+You can think of a branch as being a separate copy of the source
+code. But don't worry about it.
+@subsubheading Start work: make a new branch
-The main LilyPond repository is organized into @emph{branches} to
-facilitate development. These are often called @emph{remote}
-branches to distinguish them from @emph{local} branches you might
-create yourself (see @ref{Using local branches}).
+Let's pretend you want to add a section to the Contributor's Guide
+about using branches.
-The @code{master} branch contains all the source files used to
-build LilyPond, which includes the program itself (both stable and
-development releases), the documentation (and its translations),
-and the website. Generally, the @code{master} branch is expected
-to compile successfully.
+Start by updating the repository, then making a new branch. Call
+the branch anything you want as long as the name starts with
+@code{dev/}. Branch names that don't begin with @code{dev/} are
+reserved for special things in lilypond.
-The @code{lilypond/translation} branch is a side branch that
-allows translators to work without needing to worry about
-compilation problems. Periodically, the Translation Meister
-(after verifying that it doesn't break compilation), will
-@emph{merge} this branch back into @code{master} to incorporate
-recent translations. Similarly, the @code{master} branch is
-usually merged into the @code{lilypond/translation} branch after
-significant changes to the English documentation. See
-@ref{Translating the documentation} for details.
+@example
+git checkout master
+git pull -r origin master
+git branch dev/cg
+@end example
+@subsubheading Switch to that branch
-@node LilyPond repository sources
-@unnumberedsubsubsec LilyPond repository sources
+Nothing has happened to the files yet. Let's change into the new
+branch. You can think of this as @qq{loading a file}, although in
+this case it's really @qq{loading a directory and subdirectories
+full of files}.
+@example
+git checkout dev/cg
+@end example
-The recommended source for downloading a copy of the main
-repository is:
+Your prompt now shows you that you're on the other branch:
@example
-git://git.sv.gnu.org/lilypond.git
+gperciva@@LilyDev:~/lilypond-git (dev/cg)$
@end example
-However, if your internet router filters out connections using the
-GIT protocol, or if you experience difficulty connecting via GIT,
-you can try these other sources:
+To be able to manage multiple lilypond issues at once, you'll need to switch
+branches. You should have each lilypond issue on a separate branch.
+Switching branches is easy:
@example
-ssh://git.sv.gnu.org/srv/git/lilypond.git
-http://git.sv.gnu.org/r/lilypond.git
+git checkout master
+git checkout origin/staging
+git checkout origin/release/unstable
+git checkout dev/cg
@end example
-The SSH protocol can only be used if your system is properly set
-up to use it. Also, the HTTP protocol is slowest, so it should
-only be used as a last resort.
+Branches that begin with @code{origin/} are part of the remote repository,
+rather than your local repository, so when you check them out you get a
+temporary local branch. You should never make changes directly on a
+branch beginning with @code{origin/}. You get changes into the remote
+repository by making them in local branches, and then pushing them to
+@code{origin/staging} as described below.
+
+@subsubheading Make your changes
+
+Edit files, then commit them.
+
+@example
+git commit -a
+@end example
+
+
+Remember how I said that switching to a branch was like
+@qq{loading a directory}? Well, you've just @qq{saved a
+directory}, so that you can @qq{load} it later.
+
+@advanced{If you have used @command{cvs} or @command{svn}, you may
+be very confused: those programs use @qq{commit} to mean
+@qq{upload my changes to the shared source repository}.
+Unfortunately, just to be different, @w{@command{git commit}}
+means @qq{save my changes to the files}.}
+
+When you create a new file, you need to add it to git, then commit it:
+
+@example
+git add input/regression/avoid-crash-on-condition.ly
+git commit -a
+@end example
-@node Downloading individual branches
-@unnumberedsubsubsec Downloading individual branches
+Edit more files. Commit them again. Edit yet more files, commit
+them again. Go eat dinner. Switch to @code{master} so you can
+play with the latest changes from other developers. Switch back
+to your branch and edit some more. Commit those changes.
+At this stage, don't worry about how many commits you have.
-Once you have initialized an empty Git repository on your system
-(see @ref{Initializing a repository}), you can download a remote
-branch into it. Make sure you know which branch you want to start
-with.
-To download the @code{master} branch, enter the following:
+@subsubheading Save commits to external files
+
+Branches are nerve-wracking until you get used to them. You can
+save your hard work as individual @file{.patch} files. Be sure to
+commit your changes first.
@example
-git remote add -ft master -m master \
- origin git://git.sv.gnu.org/lilypond.git/
+git commit -a
+git format-patch master
@end example
-To download the @code{lilypond/translation} branch, enter:
+I personally have between 4 and 20 of those files saved in a
+special folder at any point in time. Git experts might laugh as
+that behavior, but I feel a @emph{lot} better knowing that I've
+got those backups.
+
+
+@subsubheading Prepare your branch for review
+
+After committing, you can update your branch with the latest master:
@example
-git remote add -ft lilypond/translation -m \
- lilypond/translation origin git://git.sv.gnu.org/lilypond.git/
+git commit -a
+git checkout master
+git pull -r origin master
+git checkout dev/cg
+git rebase master
@end example
-The @command{git@tie{}remote@tie{}add} process could take up to
-ten minutes, depending on the speed of your connection. The
-output will be something like this:
+
+Due to the speed of lilypond development, sometimes
+@code{master} has changed so much that your branch can no
+longer be applied to it. In that happens, you will have a merge
+conflict. Stop for a moment to either cry or have a stiff drink,
+then proceed to @ref{Merge conflicts}.
+
+
+@subsubheading Upload your branch
+
+Finally, you're finished your changes. Time to upload for review.
+Make sure that you're on your branch, then upload:
@example
-Updating origin
-remote: Counting objects: 235967, done.
-remote: Compressing objects: 100% (42721/42721), done.
-remote: Total 235967 (delta 195098), reused 233311 (delta 192772)
-Receiving objects: 100% (235967/235967), 68.37 MiB | 479 KiB/s, done.
-Resolving deltas: 100% (195098/195098), done.
-From git://git.sv.gnu.org/lilypond
- * [new branch] master -> origin/master
-From git://git.sv.gnu.org/lilypond
- * [new tag] flower/1.0.1 -> flower/1.0.1
- * [new tag] flower/1.0.10 -> flower/1.0.10
-⋮
- * [new tag] release/2.9.6 -> release/2.9.6
- * [new tag] release/2.9.7 -> release/2.9.7
+git checkout dev/cg
+git-cl upload master
@end example
-When @command{git@tie{}remote@tie{}add} is finished, the remote
-branch should be downloaded into your repository---though not yet
-in a form that you can use. In order to browse the source code
-files, you need to @emph{create} and @emph{checkout} your own
-local branch. In this case, however, it is easier to have Git
-create the branch automatically by using the @command{checkout}
-command on a non-existent branch. Enter the following:
+
+@subsubheading Wait for reviews
+
+While you're waiting for a countdown and reviews, go back to
+master, make a @code{dev/doc-beams} branch, and start adding doc
+suggestions from issue 12345 from the tracker. Or make a
+@code{dev/page-breaks} and fix bug in page breaking. Or whatever.
+Don't worry, your @code{dev/cg} is safe.
+
+
+@subsubheading Combining commits (optional unless you have broken commits)
+
+Does the history of your branch look good?
@example
-git checkout -b @var{branch} origin/@var{branch}
+gitk
@end example
-@noindent
-where @code{@var{branch}} is the name of your tracking branch,
-either @code{master} or @code{lilypond/translation}.
+If you have a lot of commits on your branch, you might want to
+combine some of them. Alternately, you may like your commits, but
+want to edit the commit messages.
+
+@example
+git rebase -i master
+@end example
+
+Follow instructions on the screen.
+
+@warning{This step gives you the power to completely lose your
+work. Make a backup of your commits by saving them to
+@file{.patch} files before playing with this. If you do lose
+your work, don't despair. You can get it back by using @code{git reflog}.
+The use of @code{git reflog} is not covered here.}
-Git will issue some warnings; this is normal:
+@warning{If any of the commits on your branch represent partial work that will
+not pass @var{make && make doc}, you @strong{must} squash these
+commits into a working commit. Otherwise, your push will break staging
+and will not be able to be merged to master. In general, you will
+be safer to have one commit per push.}
+
+
+@subsubheading Push to staging
+
+When you've got the coveted @code{Patch-push} status, time to
+prepare your upload:
@example
-warning: You appear to be on a branch yet to be born.
-warning: Forcing checkout of origin/master.
-Branch master set up to track remote branch master from origin.
-Already on 'master'
+git fetch
+git rebase origin/staging dev/cg~0
+gitk HEAD
@end example
-By now the source files should be accessible---you should be able
-to edit any files in the @file{lilypond-git/} directory using a
-text editor of your choice. But don't start just yet! Before
-editing any source files, learn how to keep your changes organized
-and prevent problems later---read @ref{Basic Git procedures}.
+@warning{Do not skip the @command{gitk} step; a quick 5-second
+check of the visual history can save a great deal of frustration
+later on. You should see a set of your commits that are ahead of
+@code{origin/staging}, with no label for the top commit -- only a
+SHA1 id.}
-@subsubheading Technical Details
+@warning{If @code{origin/staging} and @code{origin/master} are the
+same commit, your branch (@code{dev/cg} in the example) will also
+be at the top of the @code{gitk} tree. This is normal.}
-The @command{git@tie{}remote@tie{}add} command should add some
-lines to your local repository's @file{.git/config} file:
+If everything looks good, push it:
@example
-[remote "origin"]
- url = git://git.sv.gnu.org/lilypond.git/
- fetch = +refs/heads/master:refs/remotes/origin/master
+git push origin HEAD:staging
@end example
+Then change back to your working branch:
+
+@example
+git checkout dev/cg
+@end example
+
+@warning{It is a best practice to avoid rebasing any of your branches
+to @code{origin/staging}. If @code{origin/staging} is broken, it
+will be deleted and rebuilt. If you have rebased one of your branches
+to @code{origin/staging}, the broken commits can end up in your branch.
+The commands given above do the rebase on a temporary branch, and avoid
+changing your working branch.}
+
+
+@subsubheading Delete your branch (safe)
+
+After a few hours, if there's nothing wrong with your branch, it
+should be automatically moved to @code{origin/master}. Update,
+then try removing your branch:
+
+@example
+git checkout master
+git pull -r origin master
+git branch -d dev/cg
+@end example
+
+The last command will fail if the contents of @code{dev/cg} are
+not present in @code{origin/master}.
+
+
+@subsubheading Delete your branch (UNSAFE)
+
+@c don't give explicit commands here -- this is too dangerous to copy and paste
+Sometimes everything goes wrong. If you want to remove a branch even though
+it will cause your work to be lost (that is, if the contents of @code{dev/cg}
+are @strong{not} present in master), follow the instructions in @qq{Delete
+your branch (safe)}, but replace the @code{-d} on the final line with
+a @code{-D}.
-@node Downloading all remote branches
-@unnumberedsubsubsec Downloading all remote branches
+@node Other repositories
+@subsection Other repositories
-To download all remote branches at once, you can @command{clone}
-the entire repository:
+We have a few other code repositories.
+
+@menu
+* lilypond-extra::
+* Grand Unified Builder (GUB)::
+* lilypad::
+* yet more repositories::
+@end menu
+
+@node lilypond-extra
+@unnumberedsubsubsec lilypond-extra
+
+There is a separate repository for general administrative scripts,
+as well as pictures and media files for the website. People
+interested in working on the website should download this
+repository, and set their @code{$LILYPOND_WEB_MEDIA_GIT}
+environment variable to point to that repository.
@example
-git clone git://git.sv.gnu.org/lilypond.git
+@uref{https://github.com/gperciva/lilypond-extra}
@end example
+To configure an environment variable in bash (the default for most
+GNU/Linux distributions),
+
+@example
+export LILYPOND_WEB_MEDIA_GIT=$HOME/dir/of/lilypond-extra/
+@end example
+
+Be aware that @code{lilypond-extra} is the definitive source for some binary
+files - in particular PDF versions of papers concerning LilyPond. To add
+further PDFs of this sort, all that is necessary is to add the PDF to
+@code{lilypond-extra} and then add a reference to it in the documentation. The
+file will then be copied to the website when @code{make website} is run.
+
+However, pictures that are also used in the documentation build are mastered in
+the main git repository. If any of these is changed, it should be updated in
+git, and then the updates copied to @code{lilypond-extra}.
+
+@node Grand Unified Builder (GUB)
+@unnumberedsubsubsec Grand Unified Builder (GUB)
+
+Another item of interest might be the Grand Unified Builder, our
+cross-platform building tool. Since it is used by other projects as
+well, it is not stored in our gub repository. For more info, see
+@uref{http://lilypond.org/gub}.
+
+There are two locations for this repository: the version being used to
+build lilypond, which is at
+
+@example
+@uref{http://github.com/gperciva/gub}
+@end example
+
+and the original version by Jan Nieuwenhuizen, kept at
+
+@example
+@uref{http://github.com/janneke/gub}
+@end example
+
+
+@node lilypad
+@unnumberedsubsubsec lilypad
+
+Our binary releases on MacOS X and Windows contain a lightweight
+text editor. This code is here:
+
+@example
+https://github.com/gperciva/lilypad
+@end example
+
+
+@node yet more repositories
+@unnumberedsubsubsec yet more repositories
+
+There are a few other repositories floating around, which will
+hopefully be documented in the near future.
+
+
+@node Downloading remote branches
+@subsection Downloading remote branches
+
+@warning{contains obsolete + misleading info}
+
+@menu
+* Organization of remote branches::
+* LilyPond repository sources::
+* Other branches::
+@end menu
+
+
+@node Organization of remote branches
+@unnumberedsubsubsec Organization of remote branches
+
+
+The main LilyPond repository is organized into @emph{branches} to
+facilitate development. These are often called @emph{remote}
+branches to distinguish them from @emph{local} branches you might
+create yourself (see @ref{Using local branches}).
+
+The @code{master} branch contains all the source files used to
+build LilyPond, which includes the program itself (both stable and
+development releases), the documentation (and its translations),
+and the website. Generally, the @code{master} branch is expected
+to compile successfully.
+
+The @code{translation} branch is a side branch that
+allows translators to work without needing to worry about
+compilation problems. Periodically, the Translation Meister
+(after verifying that it doesn't break compilation), will
+@emph{merge} this branch into @code{staging} to incorporate
+recent translations. Similarly, the @code{master} branch is
+usually merged into the @code{translation} branch after
+significant changes to the English documentation. See
+@ref{Translating the documentation} for details.
+
+
+@node LilyPond repository sources
+@unnumberedsubsubsec LilyPond repository sources
+
+
+The recommended source for downloading a copy of the main
+repository is:
+
+@example
+git://git.sv.gnu.org/lilypond.git
+@end example
+
+However, if your internet router filters out connections using the
+GIT protocol, or if you experience difficulty connecting via GIT,
+you can try these other sources:
+
+@example
+ssh://git.sv.gnu.org/srv/git/lilypond.git
+http://git.sv.gnu.org/r/lilypond.git
+@end example
+
+The SSH protocol can only be used if your system is properly set
+up to use it. Also, the HTTP protocol is slowest, so it should
+only be used as a last resort.
+
@node Other branches
@unnumberedsubsubsec Other branches
@item @code{stable/XYZ}:
The branches are kept for archival reasons.
-@end itemize
+@item @code{archive/XYZ}:
+The branches are kept for archival reasons.
-Another item of interest might be the Grand Unified Builder, our
-cross-platform building tool. Since it is used by projects as
-well, it is not stored in our gub repository. For more info, see
-@uref{http://lilypond.org/gub}. The git location is
-@uref{http://github.com/janneke/gub}.
+@end itemize
@node Basic Git procedures
you have not yet pushed to @code{git.sv.gnu.org}, please do not
rebase. If you want to avoid wondering whether you should rebase
each time you pull, please always use committishes from master
-and/or lilypond/translation branch on @code{git.sv.gnu.org}, which
+and/or translation branch on @code{git.sv.gnu.org}, which
in particular implies that you must push your changes to
documentation except committishes updates (possibly after having
rebased), then update the committishes and push them.}
If any conflict happens, see @ref{Resolving conflicts}.
-There are common usage cases for merging: as a translator, you
-will often want to merge @code{master} into
-@code{lilypond/translation}; on the other hand, the Translations
-meister wants to merge @code{lilypond/translation} into
-@code{master} whenever he has checked that
-@code{lilypond/translation} builds successfully.
+There are common usage cases for merging: as a translator, you will
+often want the Translations meister to merge @code{master} into
+@code{translation}; on the other hand, the Translations meister wants
+to merge @code{translation} into @code{staging} whenever he has
+checked that @code{translation} builds successfully.
@node Commits and patches
and @command{upload.py} scripts in one of your PATH
directories (such as @file{$HOME/bin}).
-In Ubuntu (and Lilydev), you can add directories to PATH
+In Ubuntu (and LilyDev), you can add directories to PATH
by adding this line to a hidden file @file{.bashrc},
located in your home directory:
@item
Move into the top source directory and then configure @command{git
-cl} with the following commands. If you do not understand any
-question, just answer with a newline (CR).
+cl} with the following commands:
@example
-cd $HOME/lilypond-git/
+cd $LILYPOND_GIT
git cl config
@end example
+For the @qq{Rietveld server} question, the default value
+(@qq{codereview.appspot.com}) should be accepted by
+answering with a newline (CR).
+
The @qq{CC list} question should be answered with:
@example
lilypond-devel@@gnu.org
@end example
+The @qq{Tree status URL} value should be left blank. So should
+the @qq{ViewVC URL} value, since it is used by @command{git cl
+dcommit} which is only for repositories which use @command{git
+svn} (LilyPond doesn't).
+
@end enumerate
@subsubheading Uploading patch set
git cl upload origin/master
@end example
+@c Mention staging here?
If you have git push ability, make sure that you @emph{remove}
your patch (with @command{git rebase} or @command{git reset})
before pushing other stuff.
@end itemize
+First you will see a terminal editor where you can edit the
+message that will accompany your patch. @command{git-cl} will
+respect the @env{EDITOR} environment variable if defined,
+otherwise it will use @command{vi} as the default editor.
+
After prompting for your Google email address and password, the
patch set will be posted to Rietveld, and you will be given a URL
for your patch.
It is possible to work with several branches on the same local Git
repository; this is especially useful for translators who may have
-to deal with both @code{lilypond/translation} and a stable branch,
+to deal with both @code{translation} and a stable branch,
e.g. @code{stable/2.12}.
Some Git commands are introduced first, then a workflow with
@menu
+* Merge conflicts::
* Advanced Git concepts::
* Resolving conflicts::
* Reverting all local changes::
-* Working with remote branches::
* Git log::
* Applying remote patches::
* Sending and receiving patches via email::
@end menu
+@node Merge conflicts
+@subsection Merge conflicts
+
+To be filled in later, and/or moved to a different section. I
+just wanted to make sure that I had a stub ready somewhere.
+
+
@node Advanced Git concepts
@subsection Advanced Git concepts
@noindent
where @code{@var{branch}} is typically @code{master} or
-@code{lilypond/translation}; if you do not know or remember, see
+@code{translation}; if you do not know or remember, see
@ref{Downloading remote branches} to remember which commands you
issued or which source code you wanted to get.
referring to a branch, one often actually thinks about its head
and the ancestor commits of the head.
-Now we will explain the two last commands you used to get the
-source code from Git---see @ref{Downloading individual branches}.
-
-@example
-git remote add -ft @var{branch} -m @var{branch} \
- origin git://git.sv.gnu.org/lilypond.git/
-
-git checkout -b @var{branch} origin/@var{branch}
-@end example
-
-The @command{git@tie{}remote} has created a branch called
-@code{origin/@var{branch}} in your local Git repository. As this
-branch is a copy of the remote branch web from git.sv.gnu.org
-LilyPond repository, it is called a @emph{remote branch}, and is
-meant to track the changes on the branch from git.sv.gnu.org: it
-will be updated every time you run
-@command{git@tie{}pull@tie{}origin} or
-@command{git@tie{}fetch@tie{}origin}.
-
-The @command{git@tie{}checkout} command has created a branch named
-@code{@var{branch}}. At the beginning, this branch is identical
-to @code{origin/@var{branch}}, but it will differ as soon as you
-make changes, e.g. adding newly translated pages or editing some
-documentation or code source file. Whenever you pull, you merge
-the changes from @code{origin/@var{branch}} and
-@code{@var{branch}} since the last pulling. If you do not have
-push (i.e. @qq{write}) access on git.sv.gnu.org, your
-@code{@var{branch}} will always differ from
-@code{origin/@var{branch}}. In this case, remember that other
-people working like you with the remote branch @code{@var{branch}}
-of git://git.sv.gnu.org/lilypond.git/ (called
-@code{origin/@var{branch}} on your local repository) know nothing
-about your own @code{@var{branch}}: this means that whenever you
-use a committish or make a patch, others expect you to take the
-latest commit of @code{origin/@var{branch}} as a reference.
-
-Finally, please remember to read the man page of every Git command
-you will find in this manual in case you want to discover
-alternate methods or just understand how it works.
-
@node Resolving conflicts
@subsection Resolving conflicts
@end example
-@node Working with remote branches
-@subsection Working with remote branches
-
-
-@subsubheading Fetching new branches from git.sv.gnu.org
-
-To fetch and check out a new branch named @code{@var{branch}} on
-git.sv.gnu.org, run from top of the Git repository
-
-@example
-git config --add remote.origin.fetch \
- +refs/heads/@var{branch}:refs/remotes/origin/@var{branch}
-
-git checkout --track -b @var{branch} origin/@var{branch}
-@end example
-
-After this, you can pull @code{@var{branch}} from git.sv.gnu.org
-with:
-
-@example
-git pull
-@end example
-
-Note that this command generally fetches all branches you added
-with @command{git@tie{}remote@tie{}add} (when you initialized the
-repository) or @command{git@tie{}config@tie{}--add}, i.e. it
-updates all remote branches from remote @code{origin}, then it
-merges the remote branch tracked by the current branch into the
-current branch. For example, if your current branch is
-@code{master}, @code{origin/master} will be merged into
-@code{master}.
-
-
-@subsubheading Local clones, or having several working trees
-
-If you play with several Git branches, e.g. @code{master},
-@code{lilypond/translation}, @code{stable/2.12}), you may want to
-have one source and build tree for each branch; this is possible
-with subdirectories of your local Git repository, used as local
-cloned subrepositories. To create a local clone for the branch
-named @code{@var{branch}}, run
-
-@example
-git checkout @var{branch}
-git clone -lsn . @var{subdir}
-cd @var{subdir}
-git reset --hard
-@end example
-
-Note that @code{@var{subdir}} must be a directory name which does
-not already exist. In @code{@var{subdir}}, you can use all Git
-commands to browse revisions history, commit and uncommit changes;
-to update the cloned subrepository with changes made on the main
-repository, cd into @code{@var{subdir}} and run
-@command{git@tie{}pull}; to send changes made on the subrepository
-back to the main repository, run @command{git@tie{}push} from
-@code{@var{subdir}}. Note that only one branch (the currently
-checked out branch) is created in the subrepository by default; it
-is possible to have several branches in a subrepository and do
-usual operations (checkout, merge, create, delete...) on these
-branches, but this possibility is not detailed here.
-
-When you push @code{@var{branch}} from @code{@var{subdir}} to the
-main repository, and @code{@var{branch}} is checked out in the
-main repository, you must save uncommitted changes (see
-@command{git@tie{}stash}) and do
-@command{git@tie{}reset@tie{}--hard} in the main repository in
-order to apply pushed changes in the working tree of the main
-repository.
-
-
@node Git log
@subsection Git log
Patches created without @code{git@tie{}format-patch} can be
applied in two steps. The first step is to apply the patch to the
-working tree:
+working tree and the index:
@example
-git apply @var{patch}
+git apply --index @var{patch}
@end example
@noindent
author of the patch. This can be done with the following command:
@example
-git commit -a --author="@var{John Smith} <@var{john@@example.com}>"
+git commit --author="@var{John Smith} <@var{john@@example.com}>"
@end example
+Please note that using the @code{--index} option for patching is quite
+important here and @emph{cannot} reliably be replaced by using the
+@code{-a} option when committing: that would only commit files from the
+working tree that are already registered with git, so every file that
+the patch actually @emph{adds}, like a regtest for a fixed bug, would
+get lost. For the same reason, you should not use the git-independent
+@samp{patch} program for applying patches.
@node Sending and receiving patches via email
@subsection Sending and receiving patches via email
will include a @q{From} line that shows @q{ssh} as the protocol:
@example
-From ssh://@var{user}@@git.sv.gnu.org/srv/git/lilypond
+From ssh://git.sv.gnu.org/srv/git/lilypond
@end example
If the protocol shown is not @q{ssh}, check that you configured
@code{origin/staging} by looking at the git web interface on
savannah.
+It may happen occasionally that the staging branch breaks automated
+testing. In this case the automatic move of staging material to
+master gets halted in order to avoid broken material entering master.
+This is a safety net. Please do not try breaking out from it by
+adding fixes on top of staging: in that case the whole sequence will
+end up in master after all, defeating the purpose of the system. The
+proper fix usually involves rewriting the staging branch and is best
+left to core developers after discussion on the developer list.
+
@subsubheading If your work is in a patch file
Assuming that your patch is in a file called
@section Git on Windows
@warning{We heavily recommend that development be done with our
-virtual machine @ref{Lilydev}.}
+virtual machine @ref{LilyDev}.}
@c Some of this may duplicate stuff in other sections
@c But it is probably best for windows users to have it all together
@item
Book about git: @uref{http://progit.org/,Pro Git}
+
+@item
+Github help: @uref{http://help.github.com/}
+(very highly recommended by Graham)
+
@end itemize
projects / lilypond.git / blobdiff