#!/bin/sh
# Example of how to build git-lfs packages for Ubuntu 12.04
#
# On newer versions of Ubuntu, you can just do e.g.
# wget https://packagecloud.io/github/git-lfs/packages/ubuntu/xenial/git-lfs_1.2.1_i386.deb
# but alas, there are no 12.04 packages there.
# Fear not, here's how to build them.
#

sudo apt-get install build-essential devscripts debhelper git wget

# Update dpkg (installing dh-golang requires 1.16.2 or later)
wget http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg/dpkg_1.17.5ubuntu5.6.tar.xz
tar -xf dpkg_1.17.5ubuntu5.6.tar.xz
cd dpkg-1.17
sudo apt-get build-dep dpkg
sudo apt-get install liblzma-dev
debuild -b -uc -us
cd ..
sudo dpkg -i dpkg_1.17*.deb

# Build/install dh-golang (required to build golang's debian package)
git clone git://anonscm.debian.org/collab-maint/dh-golang.git
cd dh-golang
sudo apt-get install libmodule-install-perl
debuild -b -uc -us
cd ..
sudo dpkg -i dh-golang_1.19_all.deb

# Install a bootstrap go (required to run godeb)
wget https://storage.googleapis.com/golang/go1.6.3.linux-amd64.tar.gz
sudo mkdir /usr/local/bootstrap
sudo tar -C /usr/local/bootstrap -xzf go1.6.3.linux-amd64.tar.gz
export GOROOT=/usr/local/bootstrap/go

# Install go via godeb (because dh-golang requires go to be from a package)
export GOPATH=$HOME/temp-gopath
$GOROOT/bin/go get gopkg.in/niemeyer/godeb.v1/cmd/godeb
$GOPATH/bin/godeb install 1.6.3

# Switch to go installed via godeb
sudo rm -rf /usr/local/boostrap
unset GOROOT
unset GOPATH

# Get and patch the git-lfs source slightly:
git clone https://github.com/github/git-lfs.git
cd git-lfs

# Comment out the dependency on golang (godeb used a different package name),
sed -i 's/golang-go:native (>= 1.3.0),//' debian/control

sudo apt-get install ruby-ronn
debuild -b -uc -us
cd ..

# And voila, you have a git-lfs package!
ls -l git-lfs_1.2.1_amd64.deb

#---- End of build recipe ----
#---- Start of how-to-use-it recipe ---

# To use it, you have to install newer git (12.04's 1.7.9 isn't enough):
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:git-core/ppa
sudo apt-get update
sudo apt-get install git

# Finally, install the git-lfs you built:
sudo dpkg -i git-lfs_1.2.1_amd64.deb

# The above was terribly complicated, and is only worth it if
# you're trying to put git-lfs on a lot of systems.
# To do that, copy just the git package from the ppa,
# and the git-lfs package you just built,
# to the target systems and install them via dpkg -i.
# Profit!