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====== Git Tricks ======
===== Automatic deployment =====
In some cases (like managing websites in git) it's usefull to have remote working directory (production checkout) updated on each push. So you just do "git push" and you can see changes imediately on the production website. Also note that you might want to have two remote repositories (one for development and another for production). On "client" side you will later add two remotes, one called "origin" for development and another you can name like "production" or whatever else... sou you can use "git push" for everyday development versioning and "git push production" to deploy.

All you have to do on production repository is add post-receive hook to .git directory. Note it has to be chmod +x.

<file bash repository.git/hooks/post-receive>
#!/bin/sh
git --work-tree=/var/www/www.example.org checkout -f
</file>

On older git versions you may try this one:
<file bash repository.git/hooks/post-receive>
#!/bin/sh
GIT_WORK_TREE=/var/www/www.example.org git checkout -f
</file>

===== Rebasing history =====

==== Fix encoding ====

This is quite nice way to cleanup code (eg. change character encoding, remove windows newlines, reindent, etc...) through whole history of commits. Well... you can do this only for latest revision by single commit, but this can be usefull when you work with history a lot...

<code bash>
git filter-branch -f --tree-filter 'find | while read file; do dos2unix -b --d2u "$file"; done' master
</code>

==== Search and destroy files ====

This can delete file(s) from all revisions

<code bash>
git filter-branch -f --tree-filter 'rm -f dir/unwanted_file.txt' master
</code>

==== Search and destroy strings in files ====

You can use this one eg. if you want to delete a password that have been commited long time ago...

<code bash>
git filter-branch -f --tree-filter '/tmp/clean.sh' master
</code>

<code bash /tmp/clean.sh>
clean() {
	[ -f "$1" ] && sed -i 's/SEARCH/REPLACE/g' "$1"
}

clean nodes.php
clean wwwroot/nodes.php
true
</code>

==== Remove trailing blanks ====

<code bash>
git filter-branch -f --tree-filter '/tmp/clean.sh' master
</code>

<code bash /tmp/clean.sh>
clean() {
	[ -f "$1" ] && sed -i 's/[ \t]*$//' "$1"
}
find | while read file; do clean "$file"; done
true
</code>

==== Re-indent ====

<code bash>
vim -esc "normal gg=G" -c "wq" -e "file.php"
</code>

==== Delete all commits except for 5 last without changing commit hashes ====

<code bash>
git rev-parse HEAD~4  > .git/shallow
#git reflog expire --expire=0
#git prune
#git gc
git reflog expire --expire-unreachable=now --all
git gc --aggressive --prune=all
</code>
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