# Using digital source material

> Use the source, Luke
>
> -- a [pun][UTSL] on Obi-Wan Kenobi quote in Star Wars


## Git

Digital source material is tracked with git.

Git is a version control system -
a repository for historic versions of file contents of a folder.



## Create


To turn a folder into a git repository,
go into the folder,
and initialize its git database:

	git init


## Save


To "take a snapshot" of one of more files
for git archival,
first mark which files are involved
and then archive their (changes to) content:

	git add foo bar
	git add baz
	git commit -m "Update foo bar, and add baz."

Alternatively you can update (but not add)
in one go:

	git commit -m "Update foo bar." foo bar


## Share

To collaborate on a shared git repository,
first create a local copy from the shared location:

	git clone git://{{githost}}/example

Then from time to time syncronize,
first fetch eventual updates from others
and then push your local changes:

	git pull
	git push

### Publish

To publish a git repository initially created locally,
first create a new empty git publicly,
then tell your local git where its new origin will be,
and finally push your local git into its new public location:

	ssh {{gitshellhost}} git init --bare --shared /srv/git/{{githost}}/example.git
	git remote add origin {{gitshellhost}}:/srv/git/{{githost}}/example.git
	git push --set-upstream origin master


## References

* [Source of this document][source]

[UTSL]: <http://catb.org/jargon/html/U/UTSL.html>

[source]: <https://source.redpill.dk/source>.
  "Digital source material"