Installation script for Git on OS X (modified from timcharper/git_osx_installer)

git-os-x-installer.bash

#!/usr/bin/env bash

set -e -o pipefail

LATEST_GIT_VERSION=$(curl http://git-scm.com/ 2>&1 | grep -A 2 '<span class="version">' | grep '[[:digit:]].[[:digit:]]' | tr -d ' ')
GIT_VERSION="${1:-$LATEST_GIT_VERSION}"
PREFIX="/usr/local/git"
SUDO="sudo"
NOW_SECONDS=$(date +%s)
THE_ABYSS="/dev/null"

echo "Building Git v${GIT_VERSION}"

if [[ -d "$PREFIX" ]]
then
	echo "Moving your current installation of Git out of the way"
	$SUDO mv "$PREFIX" "${PREFIX}_${NOW_SECONDS}"
	echo "Your old Git installation is to ${PREFIX}_${NOW_SECONDS}"
fi

BUILD_DIR="foo${NOW_SECONDS}"
mkdir -p "$BUILD_DIR"

export TARGET_VERSION="10.6"
export TARGET_FLAGS="-mmacosx-version-min=$TARGET_VERSION -isysroot $SDK_PATH -DMACOSX_DEPLOYMENT_TARGET=$TARGET_VERSION"
export CFLAGS="$TARGET_FLAGS -arch i386 -arch x86_64"
export LDFLAGS="$TARGET_FLAGS -arch i386 -arch x86_64"

export C_INCLUDE_PATH="/usr/include"
export CPLUS_INCLUDE_PATH="/usr/include"
export LD_LIBRARY_PATH="/usr/lib"

pushd "$BUILD_DIR" > "$THE_ABYSS"
	if [[ ! -f "git-$GIT_VERSION.tar.gz" ]]
	then
		echo "Downloading the source"
		curl -sO "https://www.kernel.org/pub/software/scm/git/git-$GIT_VERSION.tar.gz"
	fi
	if [[ ! -d "git-$GIT_VERSION" ]]
	then
		echo "Extracting the downloaded source"
		tar zxf "git-$GIT_VERSION.tar.gz"
	fi
	pushd "git-$GIT_VERSION" > "$THE_ABYSS"
		echo "Compiling'n'stuff"

		$SUDO make -j32 NO_GETTEXT=1 NO_DARWIN_PORTS=1 prefix="$PREFIX" all strip install

		$SUDO mkdir -p "$PREFIX/contrib/completion"
		$SUDO cp contrib/completion/git-completion.bash "$PREFIX/contrib/completion/"
		$SUDO cp contrib/completion/git-completion.zsh "$PREFIX/contrib/completion/"
		$SUDO cp contrib/completion/git-prompt.sh "$PREFIX/contrib/completion/"

		$SUDO mkdir -p "$PREFIX/lib/perl5/site_perl"
		$SUDO cp perl/private-Error.pm "$PREFIX/lib/perl5/site_perl/Error.pm"
	popd > "$THE_ABYSS"

	$SUDO mkdir -p "$PREFIX/share/man"
	GIT_MANPAGES_ARCHIVE="git-manpages-${GIT_VERSION}.tar.gz"
	echo "Downloading the manpages"
	curl -sO "https://www.kernel.org/pub/software/scm/git/$GIT_MANPAGES_ARCHIVE"
	echo "Extracting the downloaded manpages"
	if ( ! $SUDO tar xzf "$GIT_MANPAGES_ARCHIVE" -C "$PREFIX/share/man" ); then
		echo "Extracting the man pages failed"
		exit 1
	fi
	$SUDO chmod -R go+rx "$PREFIX/share/man"
popd > "$THE_ABYSS"

$SUDO rm -fr "$BUILD_DIR"

if [[ -d /etc/paths.d ]]
then
	$SUDO sh -c "echo '$PREFIX/bin' > /etc/paths.d/git"
fi

if [[ -d /etc/manpaths.d ]]
then
	$SUDO sh -c "echo '$PREFIX/share/man' > /etc/manpaths.d/git"
fi

$SUDO sh -c "echo .DS_Store >> '$PREFIX/share/git-core/templates/info/exclude'"
$SUDO chown -R root:wheel "$PREFIX"