Acquia Pipelines script to assemble from various git sources

acquia-pipelines.yml

version: 1.0.0

events:
  build:
    steps:
      - build:
          type: script
          script:
            - bash -e scripts/pipelines_build.sh

ssh-keys:
  id_rsa:
    secure: [key]

main.yml

main:
    git_repo: git@bitbucket.org:user/drupalcode.git
    git_branch: master

pipelines_build.sh

#!/bin/bash

# Custom script to assemble a multisite codebase from a main repository and a
# collection of theme respositories.

# Make sure we don't confuse people trying to run this locally
if [[ -z "$PIPELINE_ENV" ]]; then
    echo "This script should be run from within the pipelines environment" 1>&2
    exit 1
fi

# Configuration
MAIN_CFG=scripts/main.yml
# Source site files
SITES_CFG=scripts/sites.yml

# Generic yaml parser for bash
# Source: https://gist.github.com/pkuczynski/8665367
parse_yaml() {
   local prefix=$2
   local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
   awk -F$fs '{
      indent = length($1)/7;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}
      if (length($3) > 0) {
         vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
         printf("%s%s%s=\"%s\"\n", "'$prefix'",vn, $2, $3);
      }
   }'
}

# Parse main configuration yml files.
eval $(parse_yaml $MAIN_CFG )

echo "Cloning main repository"
git clone --branch $main_git_branch --single-branch $main_git_repo main
echo "Copying what we need to the newly build docroot"
mkdir docroot
rsync -av main/docroot . --exclude sites/sites.php --exclude sites/g
rm -Rf main
echo "copying sites"
cp -Rv sites/* docroot/sites


# Parse sites configuration yml files.
eval $(parse_yaml $SITES_CFG "site_" )
# Gather an array of all site ids.
readarray -t SITES <<< "$(cat $SITES_CFG | grep ^[a-z] | cut -d ':' -f 1)"
SITE_COUNT=${#SITES[@]}
# counter
i=1


echo "Adding themes for $SITE_COUNT sites."
# Loop through each site
for SITE in "${SITES[@]}"
do
  # Parse the site configuration
  echo "Preparing for site $SITE. $i out of $SITE_COUNT"
  eval THIS_THEME=\$site_${SITE}_theme
  eval THIS_GIT_REPO=\$site_${SITE}_git_repo
  eval THIS_GIT_BRANCH=\$site_${SITE}_git_branch

  # Clone the theme repo
  echo "Fetching theme repository for $THIS_THEME"
  git clone --branch $THIS_GIT_BRANCH --single-branch $THIS_GIT_REPO $THIS_THEME
  mkdir -p docroot/sites/$SITE/themes/$THIS_THEME
  cp -Rv $THIS_THEME/* docroot/sites/$SITE/themes/$THIS_THEME
  rm -Rf $THIS_THEME

  ((i++))
done

sites.yml

site_a:
    primary_domain: site-a.com
    domains: 'www.site-a.com,site-a.com'
    theme: theme_site_a
    git_repo: git@bitbucket.org:user/theme_site_a
    git_branch: master
    agency: agency_a
site_b:
    primary_domain: site-b.com
    domains: 'www.site-b.com,site-b.com'
    theme: theme_site_b
    git_repo: git@bitbucket.org:user/theme_site_b
    git_branch: master
    agency: agency_b