Guillermo Arribas eebc63c216 Allow empty default values in variable interpolation (fixes #5185)
Signed-off-by: Guillermo Arribas <garribas@gmail.com>
2017-10-20 13:45:47 -07:00

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YAML

version: "2.1"
services:
web:
# set value with default, default must be ignored
image: ${IMAGE:-alpine}
# unset value with default value
ports:
- "${HOST_PORT:-80}:8000"
# unset value with empty default
hostname: "host-${UNSET_VALUE:-}"