A `docker-compose` wrapper for multiple configuration files with relative paths

docker-compose.sh

#!/usr/bin/env bash

TMP_FILE=/tmp/docker-compose.$$.yaml

finish() {
  rm ${TMP_FILE} ${TMP_FILE}.tmp 2>/dev/null
}

trap finish EXIT

compose-config() {
  mv -f ${TMP_FILE} ${TMP_FILE}.tmp
  docker-compose -f ${1} -f ${TMP_FILE}.tmp config >${TMP_FILE}

  rm -f ${TMP_FILE}.tmp 2>/dev/null
}

args=()
files=()

while [ -n "$1" ]; do 
  case "$1" in
    -f)
      shift; files+=($1)
      ;;
    *)
      args+=($1)
      ;;
  esac
  shift
done

echo 'version: "3"' >${TMP_FILE}

for f in ${files[@]}; do
  compose-config ${f}
done

docker-compose -f ${TMP_FILE} ${args[@]}
exit $?

@Gems: It's accepting --scale my-service=2 and exec -it but it removes -T (uppercase flags) from exec -T

Thanks for checking and reporting @bimlas

It appears that I got to learn getopts better 😅 though anyway the arguments parsing problem here isn't quite for getopts, so I replaced it with a simpler solution. I checked with the failing arguments line using exec -T and it seems to be working.

Cheers!

@Gems, seems to work fine, thanks!

Thanks for your collaboration, @bimlas 👍🏻

@Gems Thanks for sharing your script. Since I personally prefer using verbose flags when using scripts, I added support for --file:

while [ -n "$1" ]; do
  case "$1" in
    -f | --file)
      shift; files+=($1)
      ;;
    *)
      args+=($1)
      ;;
  esac
  shift
done

Maybe others find that useful, as well. 😉

PS: Also, it seems that one should now use docker compose instead docker-compose.

---

UPDATE

Here is my final version which also

• correctly prefixes version: "3"
• uses a more secure tempfile
• avoids missing project name
• correctly override previous config items

#!/usr/bin/env bash

PROJECT_NAME=$(basename `pwd`)

# Create temp file securely
TMP_FILE=`mktemp /tmp/docker-compose.XXXXXX` || exit 1
mv ${TMP_FILE} ${TMP_FILE}.yml
TMP_FILE=${TMP_FILE}.yml

# Clean up
finish() {
  rm ${TMP_FILE} ${TMP_FILE}.tmp 2>/dev/null
}

trap finish EXIT


# Prepend given file to config in order to keep the file's relative context
compose-config() {
  mv -f ${TMP_FILE} ${TMP_FILE}.tmp
  # Add the file twice: 1st for the context, 2nd for config overrides
  docker compose -p ${PROJECT_NAME} -f ${1} -f ${TMP_FILE}.tmp -f ${1} config > ${TMP_FILE}
  rm -f ${TMP_FILE}.tmp 2>/dev/null
}

# Separate -f/--file arguments from the rest
args=()
files=()

while [ -n "$1" ]; do
  case "$1" in
    -f | --file)
      shift; files+=($1)
      ;;
    *)
      args+=($1)
      ;;
  esac
  shift
done

# Generate config
for f in ${files[@]}; do
  compose-config ${f}
done

# Prepend version
mv -f ${TMP_FILE} ${TMP_FILE}.tmp
echo 'version: "3"' > ${TMP_FILE}
cat ${TMP_FILE}.tmp >> ${TMP_FILE}
rm -f ${TMP_FILE}.tmp 2>/dev/null

echo -e "
FINAL CONFIG
------------
"
docker compose -f ${TMP_FILE} config
docker compose -f ${TMP_FILE} ${args[@]}
exit $?

Thank you for sharing your version @jneuendorf-i4h , I bet many people find it even more useful than the original one 👍🏻