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I have following Makefile target defined:

.PHONY: docker-build
docker-build:
    # Build Docker image
    docker build \
    --squash \
    ...
    -t $(DOCKER_IMAGE):$(DOCKER_TAG) .

output:
    @echo Docker Image: $(DOCKER_IMAGE):$(DOCKER_TAG)

I need to use the variables DOCKER_IMAGE and DOCKER_TAG as input for another script to run right after the make docker-build.

Do you have any idea how to do it? Thanks in advance.

I have tried many ways but can't get the output from Makefile to environment variables or even just to terminal.

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  • Did you check this: stackoverflow.com/questions/16645340/… Commented Mar 12, 2020 at 12:45
  • You could A) add the output commands to the docker-build recipe, B) write the variables to a file which the output script -- or the output rule -- could read, or C) have the docker-build rule optionally call the output rule. Does any of those options appeal? Commented Mar 12, 2020 at 18:59
  • Just to elaborate on Beta's comment: it's not possible for the makefile to put environment variables into the shell that invoked make. This has nothing to do with make or makefiles. This is a fundamental feature of all POSIX programs: a program inherits its environment from its parent, and a program can never modify its parent's environment. So, the shell is a program, it invokes make (another program), and it's not possible for the child (make) to modify the environment of the parent (shell). Can't be done. Commented Mar 12, 2020 at 23:38
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