docker tag number = jupyterlab version number

Makefile

@@ -3,15 +3,18 @@ DOCKERHUB_USER = boecklic
 PWD := $(shell pwd)
 LOCAL_UID := $(shell id -u $$USER)
 CMD ?= 
+# use $$ to escape $: $$0 is reduces to $0 in shell
+TAG := $(shell cat requirements.txt | grep -E ^jupyterlab | awk '{split($$0,a,"=="); print a[2]}')
 
 .PHONY: build
 build:
-	$(DOCKER) build -t $(DOCKERHUB_USER)/jupylab\:latest .
+	@echo $(TAG)
+	$(DOCKER) build -t $(DOCKERHUB_USER)/jupylab\:$(TAG) .
 
 .PHONY: push
 push: build
-	$(DOCKER) tag $(DOCKERHUB_USER)/jupylab\:latest $(DOCKERHUB_USER)/jupylab\:latest
-	$(DOCKER) push $(DOCKERHUB_USER)/jupylab\:latest
+	$(DOCKER) tag $(DOCKERHUB_USER)/jupylab\:$(TAG) $(DOCKERHUB_USER)/jupylab\:$(TAG)
+	$(DOCKER) push $(DOCKERHUB_USER)/jupylab\:$(TAG)
 
 
 .PHONY: run
@@ -25,8 +28,8 @@ run:
 	#   the container
 	$(DOCKER) run -it --init -p 8888:8888 \
 		-e LOCAL_UID=$(LOCAL_UID) \
-		-v $(PWD):/home/user $(DOCKERHUB_USER)/jupylab\:latest $(CMD)
+		-v $(PWD):/home/user $(DOCKERHUB_USER)/jupylab\:$(TAG) $(CMD)
 
 .PHONY: login
 login:
-	$(DOCKER) exec -it $(DOCKERHUB_USER)/jupylab\:latest /bin/bash
+	$(DOCKER) exec -it $(DOCKERHUB_USER)/jupylab\:$(TAG) /bin/bash

requirements.txt

@@ -1,6 +1,6 @@
 ipykernel==5.1.0
-#jupyterlab==0.35.6
-jupyterlab==1.0.1
+jupyterlab==0.35.6
+#jupyterlab==1.0.1
 # OWSLib requires python-dev
 OWSLib==0.17.0
 plotly==3.4.2