schickling-dockerfiles/postgres-backup-s3/backup.sh

#! /bin/sh

set -eo pipefail
set -o pipefail

if [ "${S3_ACCESS_KEY_ID}" = "**None**" ]; then
  echo "You need to set the S3_ACCESS_KEY_ID environment variable."
  exit 1
fi

if [ "${S3_SECRET_ACCESS_KEY}" = "**None**" ]; then
  echo "You need to set the S3_SECRET_ACCESS_KEY environment variable."
  exit 1
fi

if [ "${S3_BUCKET}" = "**None**" ]; then
  echo "You need to set the S3_BUCKET environment variable."
  exit 1
fi

if [ "${POSTGRES_DATABASE}" = "**None**" -a "${POSTGRES_BACKUP_ALL}" != "true" ]; then
  echo "You need to set the POSTGRES_DATABASE environment variable."
  exit 1
fi

if [ "${POSTGRES_HOST}" = "**None**" ]; then
  if [ -n "${POSTGRES_PORT_5432_TCP_ADDR}" ]; then
    POSTGRES_HOST=$POSTGRES_PORT_5432_TCP_ADDR
    POSTGRES_PORT=$POSTGRES_PORT_5432_TCP_PORT
  else
    echo "You need to set the POSTGRES_HOST environment variable."
    exit 1
  fi
fi

if [ "${POSTGRES_USER}" = "**None**" ]; then
  echo "You need to set the POSTGRES_USER environment variable."
  exit 1
fi

if [ "${POSTGRES_PASSWORD}" = "**None**" ]; then
  echo "You need to set the POSTGRES_PASSWORD environment variable or link to a container named POSTGRES."
  exit 1
fi

if [ "${S3_ENDPOINT}" == "**None**" ]; then
  AWS_ARGS=""
else
  AWS_ARGS="--endpoint-url ${S3_ENDPOINT}"
fi

# env vars needed for aws tools
export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
export AWS_DEFAULT_REGION=$S3_REGION

export PGPASSWORD=$POSTGRES_PASSWORD
POSTGRES_HOST_OPTS="-h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER $POSTGRES_EXTRA_OPTS"

if [ -z ${S3_PREFIX+x} ]; then
  S3_PREFIX="/"
else
  S3_PREFIX="/${S3_PREFIX}/"  
fi


if [ "${POSTGRES_BACKUP_ALL}" == "true" ]; then
  echo "Creating dump of all databases from ${POSTGRES_HOST}..."

  pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip > dump.sql.gz

  echo "Uploading dump to $S3_BUCKET"

  cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2

  echo "SQL backup uploaded successfully"

  rm -rf dump.sql.gz
else
  OIFS="$IFS"
  IFS=','
  for DB in $POSTGRES_DATABASE
  do
    IFS="$OIFS"

    echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."

    pg_dump $POSTGRES_HOST_OPTS $DB | gzip > dump.sql.gz

    echo "Uploading dump to $S3_BUCKET"

    cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2

    echo "SQL backup uploaded successfully"

    rm -rf dump.sql.gz
  done
fi