mix_deploy

#!/usr/bin/env bash

# Deploy release from local build

set -e

export LANG="<%= env_lang %>"

# Environment vars
# DESTDIR, prefix for target files, optional
MIX_ENV="${MIX_ENV:-prod}"
VERSION="${VERSION:-<%= version %>}"

# Config vars
DEPLOY_DIR="<%= deploy_dir %>"
APP_NAME="<%= app_name %>"
DEPLOY_USER="${DEPLOY_USER:-<%= deploy_user %>}"
APP_GROUP="${APP_USER:-<%= app_group %>}"

CURRENT_LINK="${DESTDIR}${DEPLOY_DIR}/current"
TAR_FILE="_build/${MIX_ENV}/rel/${APP_NAME}/releases/${VERSION}/${APP_NAME}.tar.gz"

TIMESTAMP=$(date +%Y%m%d%H%M%S)
RELEASE_DIR="${DESTDIR}${DEPLOY_DIR}/releases/${TIMESTAMP}"

echo "==> Deploying release $VERSION to $RELEASE_DIR"
mkdir -p "$RELEASE_DIR"

echo "===> Extracting release from tar file $TAR_FILE"
tar -C "$RELEASE_DIR" -xf "$TAR_FILE"
chown -R ${DEPLOY_USER}:${APP_GROUP} "${CURRENT_LINK}"

echo "===> Setting current symlink $CURRENT_LINK"
if [[ -L "$CURRENT_LINK" ]]; then
    rm "$CURRENT_LINK"
fi
ln -s "$RELEASE_DIR" "$CURRENT_LINK"