pre-receive

#!/usr/bin/env bash

### CONFIGURATION

TARGET_REPO=$(git config sit.target)
targetbranch=$(git config sit.targetbranch)
TARGET_BRANCH=${targetbranch:-master}

###

while read -r oldrev newrev refname; do

    if [ "${newrev}" ==  "0000000000000000000000000000000000000000" ]; then
        # Branch deletion, proceed
        exit 0
    fi

    if [ "${oldrev}" != "0000000000000000000000000000000000000000" ]; then
        echo "Only new branches permitted"
        exit 1
    fi

    echo "Cloning target repo"

    tempdir=$(mktemp -d)

    target_branch="check-${newrev}"

    env -u GIT_QUARANTINE_PATH -u GIT_DIR -u GIT_OBJECT_DIRECTORY -u GIT_ALTERNATE_OBJECT_DIRECTORIES git clone ${TARGET_REPO} "${tempdir}" || exit 1
    # Figure out if we're using .sit/items or deprecated .sit/issues
    if [ -d "${tempdir}/.sit/items" ]; then
            target=item
            target_dir=.sit/items
    fi
    if [ -d "${tempdir}/.sit/issues" ]; then
            target=issue
            target_dir=.sit/issues
    fi
    target_dir_len=${#target_dir}
    env -u GIT_QUARANTINE_PATH git push "${tempdir}" "${newrev}":"refs/heads/${target_branch}" || exit 1
    cd "${tempdir}" && GIT_DIR=${tempdir}/.git env -u GIT_QUARANTINE_PATH  -u GIT_OBJECT_DIRECTORY -u GIT_ALTERNATE_OBJECT_DIRECTORIES git -c user.name="sit-git-hook" -c user.email="git@sit-it.org" rebase "${TARGET_BRANCH}" "${target_branch}"
    cd "${tempdir}" && GIT_DIR=${tempdir}/.git env -u GIT_QUARANTINE_PATH  -u GIT_OBJECT_DIRECTORY -u GIT_ALTERNATE_OBJECT_DIRECTORIES git checkout "${TARGET_BRANCH}"

    files=$(GIT_DIR=${tempdir}/.git env -u GIT_QUARANTINE_PATH  -u GIT_OBJECT_DIRECTORY -u GIT_ALTERNATE_OBJECT_DIRECTORIES git diff --name-only "origin/${TARGET_BRANCH}" "${target_branch}")

    for file in ${files}; do

        if [ "${file:0:${target_dir_len}}" != "${target_dir}" ]; then
            echo "${file}" is outside of "${target_dir}"
            exit 1
        fi

        item=$(echo "${file}" | cut -d'/' -f 3)
        record=$(echo "${file}" | cut -d'/' -f 4)
        record_path=$(echo "${file}" | cut -d'/' -f 1-4)
        if [ -d "${tempdir}/${record_path}" ]; then
            echo "Record ${item}/${record} already exists in the target repository"
            exit 1
        fi

        if [ -f "${tempdir}/${file}" ]; then
            echo "File ${file} already exists in the target repository"
            exit 1
        fi
    done

    echo "Pushing ${refname} to target"
    cd "${tempdir}" && GIT_DIR=${tempdir}/.git env -u GIT_QUARANTINE_PATH -u GIT_OBJECT_DIRECTORY -u GIT_ALTERNATE_OBJECT_DIRECTORIES git push "${TARGET_REPO}" "${target_branch}:master" || exit 1

done