Neuroimaging in Python — NiBabel 5.4.0.dev1+g3b1c7b37 documentation (original) (raw)

Development workflow

You already have your own forked copy of the nibabel repository, by following Making your own copy (fork) of nibabel. You have Set up your fork. You have configured git by following Configure git. Now you are ready for some real work.

Workflow summary

In what follows we’ll refer to the upstream nibabel master branch, as “trunk”.

This way of working helps to keep work well organized, with readable history. This in turn makes it easier for project maintainers (that might be you) to see what you’ve done, and why you did it.

See linux git workflow and ipython git workflow for some explanation.

Consider deleting your master branch

It may sound strange, but deleting your own master branch can help reduce confusion about which branch you are on. See deleting master on github for details.

Update the mirror of trunk

First make sure you have done Linking your repository to the upstream repo.

From time to time you should fetch the upstream (trunk) changes from github:

This will pull down any commits you don’t have, and set the remote branches to point to the right commit. For example, ‘trunk’ is the branch referred to by (remote/branchname) upstream/master - and if there have been commits since you last checked, upstream/master will change after you do the fetch.

Make a new feature branch

When you are ready to make some changes to the code, you should start a new branch. Branches that are for a collection of related edits are often called ‘feature branches’.

Making an new branch for each set of related changes will make it easier for someone reviewing your branch to see what you are doing.

Choose an informative name for the branch to remind yourself and the rest of us what the changes in the branch are for. For example add-ability-to-fly, orbuxfix-for-issue-42.

Update the mirror of trunk

git fetch upstream

Make new feature branch starting at current trunk

git branch my-new-feature upstream/master git checkout my-new-feature

Generally, you will want to keep your feature branches on your public githubfork of nibabel. To do this, you git push this new branch up to your github repo. Generally (if you followed the instructions in these pages, and by default), git will have a link to your github repo, called origin. You push up to your own repo on github with:

git push origin my-new-feature

In git >= 1.7 you can ensure that the link is correctly set by using the--set-upstream option:

git push --set-upstream origin my-new-feature

From now on git will know that my-new-feature is related to themy-new-feature branch in the github repo.

The editing workflow

Overview

hack hack

git add my_new_file git commit -am 'NF - some message' git push

In more detail

  1. Make some changes
  2. See which files have changed with git status (see git status). You’ll see a listing like this one:

On branch ny-new-feature

Changed but not updated:

(use "git add ..." to update what will be committed)

(use "git checkout -- ..." to discard changes in working directory)

modified: README

Untracked files:

(use "git add ..." to include in what will be committed)

INSTALL

no changes added to commit (use "git add" and/or "git commit -a") 3. Check what the actual changes are with git diff (git diff). 4. Add any new files to version control git add new_file_name (seegit add). 5. To commit all modified files into the local copy of your repo,, dogit commit -am 'A commit message'. Note the -am options tocommit. The m flag just signals that you’re going to type a message on the command line. The a flag — you can just take on faith — or see why the -a flag? — and the helpful use-case description in the tangled working copy problem. The git commit manual page might also be useful. 6. To push the changes up to your forked repo on github, do a git push (see git push).

Ask for your changes to be reviewed or merged

When you are ready to ask for someone to review your code and consider a merge:

  1. Go to the URL of your forked repo, sayhttps://github.com/your-user-name/nibabel.
  2. Use the ‘Switch Branches’ dropdown menu near the top left of the page to select the branch with your changes:
    ../_images/branch_dropdown.png
  3. Click on the ‘Pull request’ button:
    ../_images/pull_button.png
    Enter a title for the set of changes, and some explanation of what you’ve done. Say if there is anything you’d like particular attention for - like a complicated change or some code you are not happy with.
    If you don’t think your request is ready to be merged, just say so in your pull request message. This is still a good way of getting some preliminary code review.

Some other things you might want to do

Delete a branch on github

git checkout master

delete branch locally

git branch -D my-unwanted-branch

delete branch on github

git push origin :my-unwanted-branch

(Note the colon : before test-branch. See also:https://github.com/guides/remove-a-remote-branch

Several people sharing a single repository

If you want to work on some stuff with other people, where you are all committing into the same repository, or even the same branch, then just share it via github.

First fork nibabel into your account, as from Making your own copy (fork) of nibabel.

Then, go to your forked repository github page, sayhttps://github.com/your-user-name/nibabel

Click on the ‘Admin’ button, and add anyone else to the repo as a collaborator:

../_images/pull_button.png

Now all those people can do:

git clone git@githhub.com:your-user-name/nibabel.git

Remember that links starting with git@ use the ssh protocol and are read-write; links starting with git:// are read-only.

Your collaborators can then commit directly into that repo with the usual:

git commit -am 'ENH - much better code' git push origin master # pushes directly into your repo

Explore your repository

To see a graphical representation of the repository branches and commits:

To see a linear list of commits for this branch:

You can also look at the network graph visualizer for your github repo.

Finally the Fancy log output lg alias will give you a reasonable text-based graph of the repository.

Rebasing on trunk

Let’s say you thought of some work you’d like to do. YouUpdate the mirror of trunk and Make a new feature branch calledcool-feature. At this stage trunk is at some commit, let’s call it E. Now you make some new commits on your cool-feature branch, let’s call them A, B, C. Maybe your changes take a while, or you come back to them after a while. In the meantime, trunk has progressed from commit E to commit (say) G:

  A---B---C cool-feature
 /

D---E---F---G trunk

At this stage you consider merging trunk into your feature branch, and you remember that this here page sternly advises you not to do that, because the history will get messy. Most of the time you can just ask for a review, and not worry that trunk has got a little ahead. But sometimes, the changes in trunk might affect your changes, and you need to harmonize them. In this situation you may prefer to do a rebase.

rebase takes your changes (A, B, C) and replays them as if they had been made to the current state of trunk. In other words, in this case, it takes the changes represented by A, B, C and replays them on top of G. After the rebase, your history will look like this:

          A'--B'--C' cool-feature
         /

D---E---F---G trunk

See rebase without tears for more detail.

To do a rebase on trunk:

Update the mirror of trunk

git fetch upstream

go to the feature branch

git checkout cool-feature

make a backup in case you mess up

git branch tmp cool-feature

rebase cool-feature onto trunk

git rebase --onto upstream/master upstream/master cool-feature

In this situation, where you are already on branch cool-feature, the last command can be written more succinctly as:

git rebase upstream/master

When all looks good you can delete your backup branch:

If it doesn’t look good you may need to have a look atRecovering from mess-ups.

If you have made changes to files that have also changed in trunk, this may generate merge conflicts that you need to resolve - see the git rebase man page for some instructions at the end of the “Description” section. There is some related help on merging in the git user manual - see resolving a merge.

Recovering from mess-ups

Sometimes, you mess up merges or rebases. Luckily, in git it is relatively straightforward to recover from such mistakes.

If you mess up during a rebase:

If you notice you messed up after the rebase:

reset branch back to the saved point

git reset --hard tmp

If you forgot to make a backup branch:

look at the reflog of the branch

git reflog show cool-feature

8630830 cool-feature@{0}: commit: BUG: io: close file handles immediately 278dd2a cool-feature@{1}: rebase finished: refs/heads/my-feature-branch onto 11ee694744f2552d 26aa21a cool-feature@{2}: commit: BUG: lib: make seek_gzip_factory not leak gzip obj ...

reset the branch to where it was before the botched rebase

git reset --hard cool-feature@{2}

Rewriting commit history

Note

Do this only for your own feature branches.

There’s an embarrassing typo in a commit you made? Or perhaps the you made several false starts you would like the posterity not to see.

This can be done via interactive rebasing.

Suppose that the commit history looks like this:

git log --oneline eadc391 Fix some remaining bugs a815645 Modify it so that it works 2dec1ac Fix a few bugs + disable 13d7934 First implementation 6ad92e5 * masked is now an instance of a new object, MaskedConstant 29001ed Add pre-nep for a copule of structured_array_extensions. ...

and 6ad92e5 is the last commit in the cool-feature branch. Suppose we want to make the following changes:

We do as follows:

make a backup of the current state

git branch tmp HEAD

interactive rebase

git rebase -i 6ad92e5

This will open an editor with the following text in it:

pick 13d7934 First implementation pick 2dec1ac Fix a few bugs + disable pick a815645 Modify it so that it works pick eadc391 Fix some remaining bugs

Rebase 6ad92e5..eadc391 onto 6ad92e5

Commands:

p, pick = use commit

r, reword = use commit, but edit the commit message

e, edit = use commit, but stop for amending

s, squash = use commit, but meld into previous commit

f, fixup = like "squash", but discard this commit's log message

If you remove a line here THAT COMMIT WILL BE LOST.

However, if you remove everything, the rebase will be aborted.

To achieve what we want, we will make the following changes to it:

r 13d7934 First implementation pick 2dec1ac Fix a few bugs + disable f a815645 Modify it so that it works f eadc391 Fix some remaining bugs

This means that (i) we want to edit the commit message for13d7934, and (ii) collapse the last three commits into one. Now we save and quit the editor.

Git will then immediately bring up an editor for editing the commit message. After revising it, we get the output:

[detached HEAD 721fc64] FOO: First implementation 2 files changed, 199 insertions(+), 66 deletions(-) [detached HEAD 0f22701] Fix a few bugs + disable 1 files changed, 79 insertions(+), 61 deletions(-) Successfully rebased and updated refs/heads/my-feature-branch.

and the history looks now like this:

0f22701 Fix a few bugs + disable 721fc64 ENH: Sophisticated feature 6ad92e5 * masked is now an instance of a new object, MaskedConstant

If it went wrong, recovery is again possible as explained above.