git

1. Revert a commit that has already been pushed to remote

git revert -m 1 <commit-hash>
git revert - commits your changes

-m 1 indicates that you'd like to revert to the tree of the first parent before the merge
<commit-hash> is the commit hash of the merge that you would like to revert.

2. Cherry-picking a commit

Make sure you are on the branch you want to apply the commit to: git switch master

git cherry-pick <commit-hash>

3. Update master branch while being on another branch

As long as you're doing a fast-forward merge simply use git fetch <remote> <sourceBranch>:<destinationBranch>.

• Example 1:

git fetch origin master:master - merge remote branch origin/master into local branch master, without having to checkout master first

Then, if you want, you can run git merge master - to merge master into the branch you are currently on

• Example 2:

git fetch . foo:master - merge local branch foo into local branch master, without having to checkout master first

Here . means to use the local repository as the "remote"

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4. Rebase flow

Being on <my_fix> branch run: git rebase master - rebasing <my_fix> with the latest local master branch

Rebase vs Merge

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5. Pulling a specific branch from git

Option 1:

• Step 1: git fetch origin my-branch
• Step 2: git checkout my-branch - you are on your my-branch branch

Option 2:

If you did a clone, then all branches should be available to you. You need to checkout the branch: git checkout my-branch

• Step 1: If the branch isn't available for whatever reason, then you can create it: git checkout -b my-branch
-b specifies "create branch"
• Step 2: Then fetch and merge this branch into your just created local one: git pull origin my-branch

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6. Rename branch

Option 1:

• Step 1: git checkout old-name
• Step 2: git branch -m new-name

Option 2:

Let's say you are on the master branch

• Step 1: git branch -m old-name new-name

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7. Stop tracking specific files locally

git update-index --assume-unchanged common/default/settings.json

Where common/default/settings.json is some file that you want to stop tracking

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8. First-time login guide

https://kbroman.org/github_tutorial/pages/first_time.html

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9. Happened Errors

After running git clone link the following occurs (on Mac M1):

git-lfs filter-process: git-lfs: command not found
fatal: the remote end hung up unexpectedly
warning: Clone succeeded, but checkout failed

Solution: Install Git LFS extension

Option 1:

• Download Git LFS extension from https://git-lfs.github.com/
• Installed by running ./install.sh inside the unpacked folder
• Set up Git LFS for your user account by running git lfs install

Option 2:

brew install git-lfs
git lfs install

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Warning while pulling from some branch, e.g. git pull origin <branch_name>

Pulling without specifying how to reconcile divergent branches is discouraged. You can squelch (silence) this message by running one of the following commands sometime before your next pull:

• git config pull.rebase false - merge (the default strategy)
• git config pull.rebase true - rebase
• git config pull.ff only - fast-forward only

You can replace "git config" with "git config --global" to set a default preference for all repositories. You can also pass --rebase, --no-rebase, or --ff-only on the command line to override the configured default per invocation, e.g:

git pull <branch_name> --ff-only

Watch out as after that you may get fatal: Not possible to fast-forward, aborting.

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