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Git Version Control
===================
## Scattered Shallow Clone
How to clone minimally required commits to have a working repo. VERY handy if
we just need to diff two refs from a GIANT repo where we do not have a local
copy of.
Basic setup:
mkdir MyTinyClone
cd MyTinyClone
git init
git co --orphan empty
git commit --allow-empty -m "Empty commit where our HEAD can stay to reduce unwanted disk IO"
git tag empty empty
git co --detach
git br -D empty
Seek what we wanna download:
git remote add origin ssh://example.com/repo.git
git ls-remote origin | grep whatever
Fetch only EXACTLY the branches we want (for example using previous output to
decide):
git fetch origin --depth=1 refs/heads/the-branch
git br the-branch FETCH_HEAD
Usually tags are of special interest in such a clone (note how we specify it
twice with colon in between):
git fetch origin --depth=1 refs/tags/v1.2.3:refs/tags/v1.2.3
## History digging for specific file
git log --follow -- path/to/file
## Auto-destroy code-format
&& REMOTENAME=upstream \
&& BRANCH= \
&& ISSUENR= \
&& if test -n "$(git status --porcelain)"; then echo "working tree not clean" && false; fi \
&& git detach \
&& mvn spotless:apply \
&& git add -- . && git commit -m "[${ISSUENR:?}] Auto-destroy code-format" \
&& git l2 \
&& printf '\nTODO git br %s HEAD\n\n' "${BRANCH:?}" \
&& printf '\nTODO git push %s HEAD:%s\n\n' "${REMOTENAME:?}" "HEAD:${BRANCH:?}" \
## Reduce local disk usage
Source: "https://gitbetter.substack.com/p/how-to-clean-up-the-git-repo-and"
git remote prune origin
git repack
git prune-packed
git gc --aggressive
Sometimes also helpful. WARN reflog will be useless after that. Pass -n to see
what gets deleted:
git prune
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