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A Waage Blog

Ruby, Rails, Life

Archive for October, 2009

Setup a Git Repository for Redmine

with 2 comments

Just installed Redmine for our project management / code tracking with Git. I must say it’s pretty nice being able to setup multiple projects easily (unlike Trac). The system is designed fairly well with a very user-friendly interface. And plus, it’s Rails !!

Anyways… too much on Redmine! This post is to describe how to setup a Git repository for use with Redmine.

The important thing to note is that the Git repository MUST BE on the same server as your Redmine setup. So, you probably need to have access to that server!
This was not ideal for me because our Git server does not have Ruby/Rails, etc. installed on it. That’s okay! You just need to clone the repository as a BARE repository on the same machine that your Redmine app is running on. Let’s see how:

Pick a place on your Redmine app server to house all your bare Git repos.
I will choose “/var/local/git_copies” for my example.

Note: Make sure that your permissions allow for your web-user to access these Git repos. My web-user is ‘build’.

# Change to build user (see above)
$ su - build
# Create the directory
$ mkdir /var/local/git_copies

Now, create your git clone as a bare repository clone.
Note: a bare repository will not have your actual files. It will just contain the standard git folders

# Goto your git_copies directory
$ cd /var/local/git_copies
# Make a bare clone of the repo
$ git clone --bare ssh://git@reposerver/usr/local/git_root/foo-project.git

Change into your project and configure remote branch tracking for your local copy.

$ cd foo-project.git
$ git remote add origin ssh://git@reposerver/usr/local/git_root/foo-project.git

Now, normally you want to sync up the repo, but you cannot do a normal git fetch && git merge into a bare repo.
Instead, do a fetch and reset the HEAD to point to the remote branch commit. You need the ‘–soft’ flag or else you will see errors!

$ git fetch origin
$ git reset --soft refs/remotes/origin/master

Now, remember you need to manually sync your new Git repo to have the changes appear on Redmine. A better idea would be to create a cronjob that does this automatically. Especially with more than 1 repository, automating this process will save much time. Here’s the basic idea:

# Add the following to your crontab
*/30 * * * * cd /var/local/git_copies/foo-project.git && git fetch origin && git reset --soft refs/remotes/origin/master > /dev/null

Instead of doing many times in your crontab, maybe it would be easier to setup a bash script to run:

# Not tested! Use at your own risk, and change your GIT_ROOT and "*.git" to fit your setup.

ls *.git | while read repo; do
  cd $repo && git fetch origin && git reset --soft refs/remotes/origin/master > /dev/null && cd $GIT_ROOT

Then, just add this one script to your crontab and have it run every N minutes as you desire!

This site is helpful and worth checking out as well:
Reference on synchronizing 2 git repositories

That’s it, let me know how it goes!

Written by Andrew Waage

October 23rd, 2009 at 5:08 pm

Posted in Git and SVN, Ruby and Rails

Tagged with , ,

Create a new Git Remote Repository from some local files (or local git repository)

with 65 comments

So you have some files or a new Rails application, and you want to add this to a new shared remote Git repository. (I’m assuming you have access to your server and are setting up a remote repo over ssh.)

I know I can never remember how to do it, so here’s a post for me and hopefully you!

Create a local Git repository in your application for your local files.

#On local machine
cd foo_project
git init
git add *
git commit -m "My initial commit message"

Now, create the repository on your Git server. All of my git repositories are owned by a user git and located at /usr/local/git_root/. You can change these things accordingly to match your server setup.

#On remote machine (Git remote repository)
sudo su - git
cd /usr/local/git_root/

Create your new project git repo as a bare Git repository

mkdir foo-project.git
cd foo-project.git/
git --bare init

Make sure permissions are set properly. These are common options I use for my shared repositories

git config core.sharedrepository 1
git config receive.denyNonFastforwards true
find objects -type d -exec chmod 02770 {} \;
#The core.sharedrepository flag tells git to keep everything group readable and writable.
#The receive.denyNonFastforwards flag makes sure that merges can't happen when you push to the repo. You have to do the merges on your local machine, and then push the result.

Now, go back to your local repository, and add the newly created remote repository so it tracks from the remote repository (origin).

#On local machine, in your git project
git remote add origin ssh://

If you are on git 1.7+ you can simply do this:

git push -u origin master

You’re done!

If you are on an older version of git, you may need to follow these instructions to make sure your branch tracks the remote branch:

git push origin master

Now, to ensure that your local branch is tracking when you do a fetch, you need to use -f option to force a new local branch to be created even though it already exists.

#Switch to origin/master so you don't get any error about "fatal: Cannot force update the current branch."
git checkout origin/master
#Create the local "master" branch that is tracking the "origin/master" branch
git branch -f master origin/master
#Switch back to your "master" branch
git checkout master

There you have it. You should be able to push changes to origin and fetch changes to your local copy!

Written by Andrew Waage

October 21st, 2009 at 1:06 pm

Add colored git branch name to your shell prompt

with 2 comments

Here’s a little trick to get the name of your current git branch in your shell prompt. No more figuring out that you have made changes to the wrong branch once it’s too late! Your shell will not change for normal (non-git) folders. But, once you change directory into a git project, you will see the branch name added to your shell prompt like such:

Macintosh-2:git_project_foo andyuser [master] $

Simply add the following to your ~/.bash_profile or ~/.bashrc file:

function parse_git_branch_and_add_brackets {
git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\ \[\1\]/'
PS1="\h:\W \u\[\033[0;32m\]\$(parse_git_branch_and_add_brackets) \[\033[0m\]\$ "

That’s all there is to it ! Try it out !

Written by Andrew Waage

October 19th, 2009 at 3:10 pm

Posted in Git and SVN

Tagged with , , ,

Resolve a hostname from an IP address in Ruby (Reverse-DNS)

with one comment

It sounds easy, but I tried a lot of things before finding the solution I used.

I tried using:

`host` or

These were fine, but it seems a bit hacky to use the shell. Also, it would require some sort of parsing to get the hostname that I want.

Browsing the web, I found a couple solutions that almost worked.

s = Socket.getaddrinfo('',nil)
hostname = s[0][2]

This solution worked in IRB, worked in console, but for some reason would not work when I was running my mongrel server and trying to perform the exact same method call from a web-browser. ( I still don’t know why).

Digging around a bit more, I came up with this simple solution:

host ='')

Is it really that easy?? Give it a shot and let me know your thoughts !!

Written by Andrew Waage

October 9th, 2009 at 2:47 pm