replaced test .env with source .env and simplified dotenv handling in external.sh

Author: andreygubarev

README.md

@@ -54,8 +54,7 @@ Example `entrypoint.sh`:
 ```bash
 #!/bin/bash
 set -euxo pipefail
-# shellcheck disable=SC2046
-test -f .env && export $(xargs < .env)
+source .env
 
 # ...
 ```

external.sh

@@ -28,9 +28,7 @@ cp -R "${ARCHIVE_DIR}" .
 cp "${MAKESELF_BIN}" makeself.sh
 cp "${MAKESELF_HEADER_BIN}" makeself-header.sh
 chmod +x "$(basename "${ARCHIVE_DIR}")/${STARTUP_SCRIPT}"
-if [ -n "${DOTENV}" ]; then
-    echo "${DOTENV}" > "$(basename "${ARCHIVE_DIR}")/.env"
-fi
+echo "${DOTENV}" > "$(basename "${ARCHIVE_DIR}")/.env"
 
 RUN=( ./makeself.sh --nomd5 --nocrc --tar-extra '--mtime=2019-01-01' --packaging-date '1970-01-01T00:00:00Z' --base64 ${NEEDROOT} "$(basename "${ARCHIVE_DIR}")" "${FILE_NAME}" "${LABEL}" "./${STARTUP_SCRIPT}"  )
 echo "${RUN[@]}" >run.log