Update DevEnv.md (#365)

Author: shaleman

docs/DevEnv.md

@@ -59,3 +59,50 @@ $ make system-test
 
 ### 6. Commit changes to your fork; submit PR
 Note: This is best done outside the VM using your git credentials setup on the host.
+
+## Frequently asked questions
+
+### How to use Godep?
+Please see [here](./GoDep.md) for working with godep
+
+### How to trigger a Jenkins CI run on my fork?
+
+1. Go go http://contiv.ngrok.io/view/Netplugin/
+2. Click on `log in` button on top right corner and log in as user: `guest`, password: `guest`
+3. Click on `Netplugin_OnDemand_Build` job
+4. Click on `Build with Parameters` link on the left side
+5. In `GIT_URL` field, enter the URL to your fork of netplugin
+6. In `GIT_BRANCH` field, enter the branch name in your fork
+7. Click `Build` button
+
+This will checkout a tree from your fork and run full Jenkins CI on the branch.
+
+### How to work across multiple repos like netplugin, contivmodel and ofnet
+
+Easiest way to work across multiple repos is by doing a `godep restore` first and then make changes.
+
+1. SSH to vagrant VM, goto `/opt/gopath/src/github.com/contiv/netplugin` directory.
+2. issue `godep restore` command to restore all dependent packages into `$GOPATH`
+3. go to individual repo directory, for example `github.com/contiv/ofnet` and checkout your fork of the repository.
+4. Make changes to netplugin and ofnet and rebuild netplugin/netmaster using `cd /opt/gopath/src/github.com/contiv/netplugin; go install ./netplugin ./netmaster`
+5. restart netplugin/netmaster using `make host-restart`
+6. Test your code
+7. Repeat steps 4-6 multiple times as you need
+
+Once you are ready to commit:
+
+1. Commit changes in ofnet/contivmodel first. Push the changes to your fork and submit pull request.
+2. Once the pull request is merged, checkout the latest version of ofnet/contivmodel from contiv repo.
+3. update netplugin's godeps using `godep update github.com/contiv/ofnet` or `godep update github.com/contiv/contivmodel`. Note that If you are godep updating ofnet, you need to update all ofnet packages in one command. E.g. `godep update github.com/contiv/ofnet github.com/contiv/ofnet/ofctrl github.com/contiv/ofnet/ovsdbDriver github.com/contiv/ofnet/pqueue github.com/contiv/ofnet/rpcHub`
+4. Build netplugin and run unit/system tests as mentioned above
+5. Commit netplugin changes and submit a pull request
+
+### What is the development workflow with Git: Fork, Branching, Commits, and Pull Request
+
+We follow [this](https://github.com/sevntu-checkstyle/sevntu.checkstyle/wiki/Development-workflow-with-Git:-Fork,-Branching,-Commits,-and-Pull-Request) Workflow for submitting pull requests
+
+### How to squash all commits before submitting pull request
+
+It is recommended that all commits in a pull requests is squashed before they can be merged. Please see [here](http://makandracards.com/makandra/527-squash-several-git-commits-into-a-single-commit) for instruction on squashing your commits
+
+Github recently added a feature to [automatically squash all merges](https://github.com/blog/2141-squash-your-commits). We are evaluating using this. Meanwhile please continue to squash all commits in a pull request.