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--- collab:git [2011/02/17 13:31]
c703101@ZID1.UIBK.AC.AT created
+++ collab:git [2018/09/03 19:35] (current)
@@ Line 1: / Line 1: @@
-===== Git =====
+====== Git ======
-Git is an extremely powerful and flexible revision control system, and using it effectively requires adherence to conventions.
-==== Usage Policy ====
+Git is an extremely powerful and flexible revision control system, and using it effectively requires adherence to conventions.
-Here is a proposal; comments and adjustments are welcome.
+===== IIS Repository Policy =====
   * A distinct tree / a repository - is maintained for each independent (software, paper, ...) project.
-  * For each project, the mainline (master) tree is hosted here at the iis uibk servers.
+  * For each repository, the mainline (master) tree is hosted on the git.uibk.ac.at server.
   * Contributors develop locally and maintain their own trees, and push (or request to pull) only generally-useful, tried-and-proven patch sets into the main tree.
   * Where appropriate, multiple external developers can exchange patches among each others before committing to the mainline.
   * Branches are used to maintain multiple releases simultaneously while developing new features in the trunk. As long as we will not generally have formal releases, there will be little or no need for branches.
-==== Howto Clone a Git Project ====
-To get the source code initially use git clone:
-  git clone ssh://iis.uibk.ac.at:2222/projects/git/PROJEKTNAME LOCALREPO
+Please adhere to basic guidelines for [[git-usage]].
+===== Basic Workflow =====
-e.g.
-  git clone ssh://iis.uibk.ac.at:2222/projects/git/FeatureHierarchies
+{{ :collab:git-usage.png?300|git std. usage}}
-==== Standard Usage ====
+Retrieve an %%IIS%% Git tree for you to work on:
-**Develop locally, within your own trees, and push (or request to pull) only generally-useful, tried-and-proven patch sets
+  git clone https://git.uibk.ac.at/iis-XXXX/PROJECTNAME
-into the main tree.**
+''PROJECTNAME'' will typically include a path portion.
-=== Example usage ===
+Prepend the hostname with ''USERNAME@'' if your Git username does not match your local username.
-for local commits use just something like
+Now make your edits.  To see the status of your files with respect to your repository, do:
-  git commit -a -m "Commit Message"
+  git status
+For each reasonable unit of changes, tell Git that you want to keep it, and then commit it to your local tree:
+  git add FILENAME
+  git commit -m "brief documentation of your changes"
+Each self-contained, fully-functional set of changes that you want to make public should be pushed upstream to the %%IIS%% master tree:
+  git push
+At this point you are free to delete your local Git tree.
+In the meantime, you can retrieve updates from the %%IIS%% master tree with:
+  git pull
+For more information, see the [[http://gitref.org/|Git Reference]] and [[http://www.kernel.org/pub/software/scm/git/docs/everyday.html|Everyday Git]].
+A ''git pull'' will automatically merge any edits other people have pushed in the meantime.  However, this will fail if such edits happened in the same section of a file as the changes you are trying to push.  In this case, ''git pull'' will signal a merge conflict, which needs to be resolved by hand.
+[[http://www.rosipov.com/blog/use-vimdiff-as-git-mergetool/|Here]] you may find a nice tutorial on how you can do merging by using vimdiff (you should be able to use vim for using it).
+===== Understanding Git =====
+[[http://eagain.net/articles/git-for-computer-scientists/|Here]] is an excellent and brief explanation of Git's internal representation and how it supports user-level interactions.  Very useful to understand Git.
+Two key distinctions from Subversion (SVN) are
+  * the //staging area// ("index") where you define the changes to be commited. (SVN commits directly from the working directory.)
+  * the //distributed// nature. Commits are done to the local clone of the repository. Sharing your changes requires explicit action, e.g., ''git push''. (SVN commits directly to a central repository.)
+===== More Advanced Hints =====
+==== Git Revisions ====
+The following diagram is an example 'commit' view of a master tree (w.o. branches).
+it describes the difference between revert and reset.
+{{ :collab:git_revisions_without_branches.png?400|git revisions wo branches}}
+==== Textmode Tool For Git ====
+a nice (commandline) tool for viewing commits, logs, diffs and other changes is tig. to install tig on a debian based machine
+  apt install tig
+change into the git working directory and start
+  tig
+==== Patches ====
 Generate Patches and use Peer-to-peer patch exchanges ((example taken from http://linuxwireless.org/en/developers/Documentation/git-guide))
@@ Line 47: / Line 98: @@
-==== For Releases ====
+==== ssh Config ====
-push the local commits to the server (master tree) - as mentioned above only generally-useful, tried-and-proven code.
+You could also create an ssh config file in your home-directory to shorten the git commands:
+The ~/.ssh/config file could look like:
-  git push origin master
+<file>
+Host iis
+    HostName iis.uibk.ac.at
+    Port 22
+    User username
+    #IdentityFile  ~/.ssh/PRIVATEKEYFILE
+</file>
-to get updates from the server
+The IdentityFile line is only for ssh key auth necessary.
-  git pull origin master
+The commands then would look like
+  git clone ssh://iis/projects/git/projectname
-==== References ====
+{{tag>git Usage}}
-howto think like git:
-http://gitref.org/
-this may also be a good starting point:
-http://www.kernel.org/pub/software/scm/git/docs/everyday.html

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