#!/bin/bash
set -euo pipefail

PROGNAME=$(basename $0)

die() {
    echo "$PROGNAME: $*" >&2
    exit 1
}

# Check $1 is defined and not empty
check_var() {
    local name=$1
    if ! env | grep -q "^$name=..*" ; then
        die "Environment variable $name is not set or is empty"
    fi
}

usage() {
    if [ "$*" != "" ] ; then
        echo "Error: $*"
        echo
    fi

    cat << EOF
Usage: $PROGNAME [OPTION ...] <project> <build_file> [build_file...]

Uploads build artifacts to a server using scp.

Files are upload to builds/<project>/.

Expects the following environment variables to be set:
- UPLOAD_USERNAME
- UPLOAD_PRIVATE_KEY
- UPLOAD_HOSTNAME

Options:
  -h, --help          display this usage message and exit
EOF

    exit 1
}

project=""
build_files=""
while [ $# -gt 0 ] ; do
    case "$1" in
    -h|--help)
        usage
        ;;
    -*)
        usage "Unknown option '$1'"
        ;;
    *)
        if [ -z "$project" ] ; then
            project="$1"
        else
            build_files="$build_files $1"
        fi
        ;;
    esac
    shift
done

if [ -z "$build_files" ] ; then
    usage "Not enough arguments"
fi

check_var UPLOAD_USERNAME
check_var UPLOAD_PRIVATE_KEY
check_var UPLOAD_HOSTNAME

echo "Uploading"
eval $(ssh-agent)
echo "$UPLOAD_PRIVATE_KEY" | ssh-add -
scp -o "StrictHostKeyChecking off" $build_files "$UPLOAD_USERNAME@$UPLOAD_HOSTNAME:builds/$project/"