Script to init a git repository on a server to easily deploy several website via git (think Heroku!). Useful for Apache + PHP for instance. Bonus: Deployment versioning and custom "install.sh" script run if foud.

init_git_repo.sh

#!/bin/sh
# Copyright Sébastien Saunier (@ssaunier) - 2013
# License: MIT
#
# Script to run at the root of an apache folder where you want to deploy with git.
# It will create a repository where you can push, and set up a post-receive script
# with is run each time this server gets pushed a new version:
#
# 1. post-receive compute the new version number based on existing ones
#    in the $DEPLOYMENT_TARGET_ROOT folder
# 2. post-receive checks out a fresh version of the repo to the newest version folder
# 3. post-receive keeps only last $VERSIONS_TO_KEEP versions and delete the other ones
# 4. post-receive executes the ./install.sh script contained in the repo, in the
#    folder $APACHE_ROOT, passing as first argument $DEPLOYMENT_TARGET_ROOT/current
# 5. post-receive symlink the latest revision to $DEPLOYMENT_TARGET_ROOT/current
#
# Say you have to VHOSTS in your git repository:
#   - site1
#   - site2
#   - install.sh
#
# On the server, in the $APACHE_ROOT, you will have this:
#
#   - web.git -> the git repository
#   - site1    -> symlinked to deployment/current/site1
#   - site2    -> symlinked to deployment/current/site2
#   - deployment
#     +-- 3
#     +-- 4
#     +-- 5
#     +-- 6
#     +-- 7
#     +-- current -> symlinked to 7

REPO_NAME=web.git
DEPLOYMENT_TARGET_ROOT=~/deployment
VERSIONS_TO_KEEP=5
APACHE_ROOT=~/

mkdir -p $REPO_NAME
cd $REPO_NAME
git --bare init
cat <<EOF >hooks/post-receive
#!/bin/sh
GREEN="\\033[1;32m"
NORMAL="\\033[0;39m"

DEPLOYMENT_TARGET_ROOT=$DEPLOYMENT_TARGET_ROOT
VERSION=1

if [ -d \$DEPLOYMENT_TARGET_ROOT ]; then
  VERSION=\$((\`ls \$DEPLOYMENT_TARGET_ROOT | sort -n | tail -n 1\` + 1))
fi
DEPLOYMENT="\$DEPLOYMENT_TARGET_ROOT/\$VERSION"
mkdir -p \$DEPLOYMENT

echo "-----> Updating website"
echo -e "       New version will be: \$GREEN\$VERSION\$NORMAL"
GIT_WORK_TREE=\$DEPLOYMENT git checkout -f
echo "       New version in place, waiting to be symlinked"

echo "-----> Keeping only $VERSIONS_TO_KEEP last versions on server"
COUNTER=1
LAST_KEPT_VERSION=\$((\$VERSION-$VERSIONS_TO_KEEP-1))
until [ \$COUNTER -ge \$LAST_KEPT_VERSION ]; do
  rm -rf \$DEPLOYMENT_TARGET_ROOT/\$COUNTER
  let COUNTER+=1
done
for version in \`ls \$DEPLOYMENT_TARGET_ROOT | sort -n\`; do
  echo "       \`stat -c '%n %A %.19z' \$DEPLOYMENT_TARGET_ROOT/\$version\`"
done

echo "-----> Symlinking current version to version \$VERSION"
ln -sfn \$DEPLOYMENT "\$DEPLOYMENT_TARGET_ROOT/current"

echo "-----> Executing install script at \$DEPLOYMENT/install.sh"
cd \$APACHE_ROOT
\$DEPLOYMENT/install.sh \$DEPLOYMENT_TARGET_ROOT/current

echo "       Install script completed."
echo "-----> Congratulations! The new version \$VERSION is now deployed!"
EOF
chmod +x hooks/post-receive