A few words about git submodules and how to use it in the devops world.

1. 1
Git submodules
Devops Meetup Krk
2015­06­17
Maciej Lasyk

2. GIT submodules ­ WTF?
2

3. 3
PL: moduły zależne

4. 4
git submodule add <URL> <dirname>
git status
git diff --cached --submodule

5. 5
.gitmodules
[submodule "ansible-piwik"]
path = ansible-piwik
url = git@github.com:docent-net/ansible-piwik.git

6. 6
Cloning repos w/submodules?
git clone <URL> # just standard content without submodules data

7. 7
Cloning repos w/submodules?
git submodule init
git sumobule update

8. 8
Cloning repos w/submodules?
git clone --recursive <URL>

9. 9
Update submodule code to the latest
revision?
# run in submodule dir
git fetch
git merge <origin/master>
# updates all submodules data
# run from maindir
git submodule update --remote

10. 10
Change submodule branch?
.gitmodules
~/.git/config

11. 11
by default: detach HEAD state
git checkout <branch>
git submodule update --remote merge

12. 12
Pushing changes?
git push --recurse-submodules

13. 13
Removing submodule?
# edit .gitmodules
git rm --cached <submodule-dir>
# commit change

14. 14
foreach
git submodule foreach 'git diff'
git submodule foreach 'git pull'

15. 15
Thanks :)
Maciej Lasyk
@docent­net
http://maciej.lasyk.info