pre-push

#!/bin/sh

# This git hook script is to create a code review entry on Crucible. Called by "git
# push" after it has checked the remote status, but before anything has been
# pushed. If this script exits with a non-zero status nothing will be pushed.
#
# This hook is called with the following parameters:
#
# $1 -- Name of the remote to which the push is being done
# $2 -- URL to which the push is being done
#
# If pushing without using a named remote those arguments will be equal.
#
# Information about the commits which are being pushed is supplied as lines to
# the standard input in the form:
#
#   <local ref> <local sha1> <remote ref> <remote sha1>
#

crucible_url="#HOST_PORT#"
project_key="#PROJECT_KEY#"
username="#USERNAME#"
password_base64="#PASSWORD_IN_BASE64#"
reviewers="#COMMA_SEPERATED_USERNAMES#"

remote="$1"
url="$2"

z40=0000000000000000000000000000000000000000

while read local_ref local_sha remote_ref remote_sha
do
	# Find local branch name and git user
	local_branch=`echo ${local_ref:11}`
	git_author=`git config user.name`
	
	# Decode the password
	password=`echo $password_base64 | base64 --decode`
	
	if [ "$local_sha" = $z40 ]
	then
		# Handle delete
		:
	else
		if [ "$remote_sha" = $z40 ]
		then
			# New branch, examine all commits

			# Find the parent branch
			vbc_col=$(( $(git show-branch | grep '^[^\[]*\*' | head -1 | cut -d* -f1 | wc -c) - 1 ))
			swimming_lane_start_row=$(( $(git show-branch | grep -n "^[\-]*$" | cut -d: -f1) + 1 ))
			parent_branch=`git show-branch | tail -n +$swimming_lane_start_row | grep -v "^[^\[]*\[$local_branch" | grep "^.\{$vbc_col\}[^ ]" | head -n1 | sed 's/.*\[\(.*\)\].*/\1/' | sed 's/[\^~].*//'`

			range="$parent_branch..$local_branch"
			# Get the diff from git
			commit_diff=`git diff -U1000 "$range"`

		else
			# Update to existing branch, examine new commits
			range="$remote_sha..$local_sha"

			# Create a temp branch to extract changes of the user
			temp_branch="temp_$remote_sha"
			temp_branch+="_$RANDOM"
		
			git_operation=`git checkout -b "$temp_branch" "$remote_sha"`
			git_operation=`git cherry-pick $(git log --format=%H --author="$git_author" "$range")`

			# Get the diff from git
			commit_diff=`git diff -U1000 "$remote_sha" "$temp_branch"`

			# Clean up temp branch
			git_operation=`git checkout "$local_branch"`
			git_operation=`git branch -D "$temp_branch"`

		fi

		if [ ! -z "${commit_diff// }" ] 
		then
			commit_diff='<![CDATA['"$commit_diff"']]>'

			# Get commit messages for the user
			last_commit_message=`git log --author="$git_author" --format=%f -n 1 "$range"`
			all_commit_messages=`git log --author="$git_author" --format=%f "$range"`
			
			# Call Crucible for create a new review
			review_data='<?xml version="1.0" encoding="UTF-8" standalone="yes"?><createReview><reviewData><allowReviewersToJoin>true</allowReviewersToJoin><author><userName>'"$username"'</userName></author><creator><userName>'"$username"'</userName></creator><description>'"$all_commit_messages"'</description><moderator><userName>'"$username"'</userName></moderator><name>'"$last_commit_message"'</name><projectKey>'"$project_key"'</projectKey><state>Review</state><summary>'"$last_commit_message"'</summary><type>REVIEW</type></reviewData><patch>'"$commit_diff"'</patch></createReview>'
			create_review_response=`curl -i --user "$username:$password" -H "Content-Type: application/xml" -X POST --data "$review_data" "$crucible_url/rest-service/reviews-v1"`
			
			# Extract location of the review from response
			location_header=`echo "$create_review_response" | grep Location:`
			review_url=`echo ${location_header:9}`
			
			if [ ! -z "${reviewers// }" ] 
			then
				# Add reviewers to the review
				add_reviewers_response=`curl --user "$username:$password" -H "Content-Type: application/json" -X POST "$review_url/reviewers" --data "$reviewers"`

				# Send reminders to reviewers
				recipient_data=""
				IFS=',' read -ra splits <<< "$reviewers"
				for i in "${splits[@]}"; do
					recipient_data+="recipients=$i&"
				done

				recipient_data="${recipient_data: : -1}"
				remind_reviewers_response=`curl --user "$username:$password" -X POST "$review_url/remind" --data "$recipient_data"`
			
			fi		
			
			echo >&2 "Successfully created a new Code Review for the changes. Code Review URL = $review_url"
		fi
	fi
done

exit 0