#!/bin/bash

set -e

# Gets Repositories listed in the a repository file and places them in
# the repository directory.
# The format of the repository file is one or more lines matching
# <name> <type> <destination> <location> [<ref>]
function get_repos_for_element(){
    local REPO_SOURCES=$1

    local REGEX="^([^ ]+) (git|tar) (/[^ ]+) ([^ ]+) ?([^ ]*)$"
    while read line ; do

        # ignore blank lines and lines begining in '#'
        [[ "$line" == \#* ]] || [[ -z "$line" ]] && continue

        if [[ "$line" =~ $REGEX ]]  ; then
            local REPONAME=${BASH_REMATCH[1]}
            local REPOTYPE=${BASH_REMATCH[2]}
            local REPOPATH=${BASH_REMATCH[3]}
            local REPOLOCATION=${BASH_REMATCH[4]}
            local REPOREF=${BASH_REMATCH[5]:-master}

            local REPO_DIRECTORY=$TMP_MOUNT_PATH$REPOPATH
            local REPO_SUB_DIRECTORY=$(dirname $REPO_DIRECTORY)

            # REPOTYPE can be overridden with DIB_REPOTYPE_{name}
            local REPOTYPE_OVERRIDE=DIB_REPOTYPE_${REPONAME/-/_}
            REPOTYPE=${!REPOTYPE_OVERRIDE:-$REPOTYPE}

            # REPOLOCATION can be overridden with DIB_REPOLOCATION_{name}
            local REPOLOCATION_OVERRIDE=DIB_REPOLOCATION_${REPONAME/-/_}
            REPOLOCATION=${!REPOLOCATION_OVERRIDE:-$REPOLOCATION}

            # REPOREF can be overridden with DIB_REPOREF_{name}
            local REPOREF_OVERRIDE=DIB_REPOREF_${REPONAME/-/_}
            REPOREF=${!REPOREF_OVERRIDE:-$REPOREF}

            case $REPOTYPE in
            git)
                sudo mkdir -p $REPO_SUB_DIRECTORY
                sudo git clone $REPOLOCATION $REPO_DIRECTORY
                pushd $REPO_DIRECTORY
                sudo git reset --hard $REPOREF
                popd
                ;;
            tar)
                # The top level directory of the tarball mightn't have a fixed name i.e.
                # it could contain version numbers etc... so we write it to a tmpdir
                # the then move the contents into the directory we want it in, this does
                # assume the tarball only contains a single top level directory
                local tmpdir=$(mktemp --tmpdir=$TMP_MOUNT_PATH/tmp -d)
                curl $REPOLOCATION | tar -C $tmpdir -xzf -
                sudo mkdir -p $REPO_DIRECTORY
                sudo mv $tmpdir/*/* $REPO_DIRECTORY
                rm -rf $tmpdir
                ;;
            *)
                echo "Unsupported repository type"
                return 1
                ;;
            esac

        else
            echo "Couldn't parse '$line' as a source repository"
            return 1
        fi
    done < $REPO_SOURCES
}

# Get source repositories for the target
for _SOURCEREPO in $(find $TMP_HOOKS_PATH -maxdepth 1 -name "source-repository-*") ; do
    get_repos_for_element $_SOURCEREPO
done