export all variables from EnvironmentFiles

Question

I'd like to export all variables used by a certain systemd service, and are specified in its unit file using EnvironmentFile.

E.g. foo.service :

[Service]
...
EnvronmentFile=/foo.env
EnvronmentFile=/bar.env

foo.env:

a=1
#b=2
c=3

So I've thought adding to my bashrc something like

set -a
grep EnvironmentFile /etc/systemd/system/foo.service | grep -v '^ *#' | cut -d'=' -f2 | xargs  -I {} bash -c 'source {};'
set +a

as specified in this answer.

Is there a more elegant solution?

Answer 1

This won't work at all because you're executing a new bash shell to do the 'source'

Try:

load_env() 
{
  local files=( $(egrep '^[ ]*EnvironmentFile' "$1" ) )
  local f 
  set -a
  for f in "${files[@]}"
  do
     .   "${f##*=}"   # this expression delete the EnvironmentFile= part
  done
  set +a
}

load_env /etc/systemd/system/foo.service