Generate m3db org's package dag structure

generate.sh

#!/bin/bash
if ! [ -x "$(command -v git)" ]; then
  echo 'Error: git is not installed.' >&2
  exit 1
fi

if ! [ -x "$(command -v dot)" ]; then
  echo 'Error: graphviz (dot) is not installed.' >&2
  exit 1
fi

set -euxo pipefail

CWD="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

REPOS=(m3db m3x m3collector m3aggregator m3metrics m3coordinator m3em m3nsch m3cluster)

temp_dir=$(mktemp -d)
echo "Temp dir: $temp_dir"

cd $temp_dir

trap "{ cd $CWD; rm -rf $temp_dir ; }" EXIT ERR

for repo in "${REPOS[@]}"
do
  echo $repo
  git clone git@github.com:m3db/$repo.git
done

function generate_dot_file() {
find . -name 'glide.yaml' -not -path '*/vendor/*' \
  | xargs -I{} grep -H github.com/m3db {}         \
  | grep ':-' > $temp_dir/dag.out

INPUT_FILE=$temp_dir/dag.out python <<END

import os
from collections import defaultdict

input_file_path = os.environ['INPUT_FILE']
input_file = open(input_file_path)

# expected input  "./m3aggregator/glide.yaml"
def extract_repo(glide_file):
    end = glide_file.rfind('/')
    if end == -1:
        raise "Unknown format: %s" % glide_file
    start = glide_file.rfind('/', 0, end-1)
    if start == -1:
        raise "Unknown format again: %s" % glide_file
    return glide_file[start+1:end]

# expected input github.com/m3db/m3db
def extract_repo_from_package(package):
    end = package.rfind('/')
    if end == -1:
        raise "Unknown format: %s" % package
    return package[end+1:]

graph = defaultdict(lambda: set())
for line in input_file.readlines():
    line = line.strip()
    # e.g. line = "./m3aggregator/glide.yaml:- package: github.com/m3db/m3cluster"
    glide_file, misc, package = line.split(' ')
    dependent = extract_repo(glide_file)
    upstream = extract_repo_from_package(package)
    # print "%s %s | %s" % (dependent, upstream, line)
    graph[upstream].add(dependent)

print 'digraph G {'
print '  "ci-scripts" -> "build-tools" '
print '  "build-tools" -> "ci-scripts" '
for key in graph:
    print ' "ci-scripts" -> "%s"' % key
    print ' "build-tools" -> "%s"' % key
    for dep in graph[key]:
        print ' "%s" -> "%s"' % (key, dep)
print '}'
END
}

generate_dot_file > $temp_dir/dag.dot
dot -Tpng -o $CWD/dag.png $temp_dir/dag.dot
open $CWD/dag.png