lk/data/git.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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> git config --global user.email *"malinfreeborn@posteo.net"*
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> git config --global user.name *"Malin Freeborn"*
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# New Git
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Start a git in a folder:
> mkdir *project* && cd *project*
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> git init
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Make a file explaining what the project does:
> vim README.md
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> git add README.md
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Then make the initial commit, explaining the change you just made:
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> git commit
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# Working
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Once you make a change to some file ("file.sh"), add it and make a commit explaining it.
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> git add file.sh
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> git commit -m"change file.sh"
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Check your history:
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> 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).
Find the address you want and add it as a remote:
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> git remote add *gitlab* *https://gitlab.com/username/projectx*
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Tell git you're pushing the branch "master" to the remote repo "origin":
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> 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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> 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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> git branch *featurez*
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Have a look at all your branches:
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> git branch
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Switch to your new branch:
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> 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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> git branch -D *featurez*
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Or if it's a good branch, push it to the remote:
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> 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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> git merge *featurez*
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and delete `featurez` as you've already merged it:
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> git branch -d featurez
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# Subtree
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## Pulling another git repo into a subtree
> git subtree add -P config git@gitlab.com:bindrpg/config.git master
## 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.
> git subtree split --prefix=sub-1 -b sub
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:
> cd ..;mkdir sub-1;cd sub-1;git init --bare
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.
> git clone ../subtest
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# Tricks
## Delete All History
> git checkout --orphan temp
> git add -A
> git commit -am "release the commits!"
> git branch -D master
> git branch -m master
> git push -f origin master
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
> git fsck --full
> git gc --prune=now --aggressive
> git repack
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## Find Binary Blobs
```
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
```