lk/data/git/basics.md

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---
title: "git"
tags: [ "Documentation", "data" ]
---
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# Starting
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## New Machines
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```bash
git config --global user.email "$YOUR_EMAIL"
```
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```bash
git config --global user.name "$YOUR_NAME"
```
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# New Git
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Start a git in directory `$DIR`:
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```bash
mkdir $DIR && cd $DIR
```
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```bash
git init
```
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Make a file explaining what the project does:
```bash
vim README.md
```
Add this to the git:
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```bash
git add README.md
```
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Then make the initial commit, explaining the change you just made:
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```bash
git commit
```
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# Working
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Once you make a change to some file, add it and make a commit explaining it.
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```bash
git add $FILE
```
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```bash
git commit -m"change $FILE"
```
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Check your history:
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```bash
git log
```
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# Remotes
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If you want to keep a copy on a public site such as Gitlab, so others can see it, then go there and create a blank project (no readme, nothing).
Give it the same name as the `$DIR` directory, above.
Add this as a remote:
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```bash
REMOTE=gitlab
git remote add $REMOTE https://gitlab.com/$USERNAME/$DIR
```
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Tell git you're pushing the branch "master" to the remote repo "origin":
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```bash
git push -u master origin
```
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If someone makes a change on the remote, pull it down with:
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```bash
git pull
```
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# Branches
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A branch is a full copy of the project to test additional ideas.
You can make a new branch called 'featurez' like this:
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```bash
git branch *featurez*
```
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Have a look at all your branches:
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```bash
git branch
```
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Switch to your new branch:
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```bash
git checkout *featurez*
```
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And if your changes are rubbish, checkout the "master" branch again, then delete "featurez":
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```bash
git branch -D *featurez*
```
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Or if it's a good branch, push it to the remote:
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```bash
git push *origin* *featurez*
```
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## Merging
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Once you like the feature, merge it into the main branch. Switch to master then merge it:
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```bash
git merge *featurez*
```
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and delete `featurez` as you've already merged it:
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```bash
git branch -d featurez
```
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# Subtree
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## Pulling another git repo into a subtree
```bash
git subtree add -P config git@gitlab.com:bindrpg/config.git master
```
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## Pulling a Subtree from an existing git
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The project has subdirectories sub-1,sub-2,sub-3. The first should be its own repository, but should also retain its own history.
First, we extract its history as an independent item, and make that into a seprate branch.
```bash
git subtree split --prefix=sub-1 -b sub
```
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If you want something a few directories deep, you can use `--prefix=sub-1/dir-2/dir-3
Then go and create a new git somewhere else:
```bash
cd ..;mkdir sub-1;cd sub-1;git init --bare
```
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Then go back to your initial git repo, and do the following:
git push ../subtest sub:master
Finally, you can clone this repo from your original.
```bash
git clone ../subtest
```
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# Tricks
## Delete All History
```bash
git checkout --orphan temp
```
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```bash
git add -A
```
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```bash
git commit -am "release the commits!"
```
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```bash
git branch -D master
```
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```bash
git branch -m master
```
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```bash
git push -f origin master
```
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Gitlab requires more changes, such as going to `settings > repository` and switching the main branch, then stripping protection.
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## Clean up Bloated Repo
```bash
git fsck --full
```
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```bash
git gc --prune=now --aggressive
```
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```bash
git repack
```
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## Find Binary Blobs
```bash
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git rev-list --objects --all \
| git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' \
| sed -n 's/^blob //p' \
| sort --numeric-sort --key=2 \
| cut -c 1-12,41- \
| $(command -v gnumfmt || echo numfmt) --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest
```
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# More
For big binary files (like images), see [git large-file-storage](git-lfs.md)