#!/bin/bash
# restore cached Maven home directory cache, ignoring failures

declare Pkg=restore-maven-repository
declare Version=0.1.0

# print message to stdout
# usage: msg MESSAGE
function msg () {
    echo "$Pkg: $*"
}

# print message to stderr
# usage err MESSAGE
function err () {
    msg "$*" 1>&2
}

# usage: main "$@"
function main () {
    local maven=$HOME/.m2
    if ! mkdir -p "$maven"; then
        err "failed to ensure '$maven' directory exists"
        return 0
    fi

    local cache=/opt/data/$ATOMIST_OWNER/$ATOMIST_REPO
    local file=$cache/maven-repository.tar.gz
    if [[ ! -f $file ]]; then
        msg "no local Maven repository in cache: $file"
        return 0
    fi

    msg "restoring local Maven repository from cache"
    if ! tar -x -z -f "$file" -C "$maven"; then
        err "failed to extract cache '$file' to '$maven', retrying"
        if ! tar -x -z -f "$file" -C "$maven"; then
            err "failed to extract cache '$file' to '$maven' again, removing offending cache file"
            rm -f "$file"
        fi
    fi
    return 0
}

main "$@" || exit 1
exit 0