Binderhub helm chart install fails when specifying `--version` with helm v3

For some reason, I have trouble installing binderhub via helm v3 (I’m using v3.0.3). The error message is Error: failed to download "jupyterhub/binderhub" (hint: running helm repo update may help).. The issue is, however, not related to helm repo update.

Steps to reproduce:

Add the helm repo and update it:

helm repo add jupyterhub https://jupyterhub.github.io/helm-chart
helm repo update

Run helm repo list. Output on my computer:

NAME              URL
stable            https://kubernetes-charts.storage.googleapis.com
jetstack          https://charts.jetstack.io
pfisterer-knox    https://pfisterer.github.io/apache-knox-helm/
jupyterhub        https://jupyterhub.github.io/helm-chart

Run helm search repo -l jupyterhub/binderhub to list available versions. Output on my computer:

NAME                	CHART VERSION    	APP VERSION	DESCRIPTION
jupyterhub/binderhub	0.2.0-001.00f7197	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-013.dace2ee	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-049.8a0cee8	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-024.1820a10	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-021.66516e5	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-072.544c0b1	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-065.f0e541b	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-037.c81a986	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-059.78bfbcd	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-028.9ba1fc3	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-039.58fb2a0	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-061.4221738	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-018.0c62683	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-056.8c51534	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-051.99305a6	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-0216360    	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-068.0b5080a	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-045.089702b	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-026.7c50358	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-004.9756642	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-017.5aa671c	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-069.dbffec6	           	A helm chart to install Binder

When trying to install version 0.2.0-068.0b5080a using helm install '--version=0.2.0-068.0b5080a' '--namespace=cert-manager' -f '/var/folders/_k/g6547cr924b2vw4b_w61lfym0000gn/T/ansible.fzu39_4jbinderhub-config.yaml' 'hub' 'jupyterhub/binderhub', I get

Error: failed to download "jupyterhub/binderhub" (hint: runninghelm repo updatemay help).

When trying to install version 0.2.0-9994a92, everything works as expected. But anything using a different format (e.g., ‘–version=0.2.0-068.0b5080a’) does not work.

When NOT specifying a --version but --devel, it installs the chart w/o error message but helm list --all-namespaces does not show an app version:

NAME           	NAMESPACE   	REVISION	UPDATED                             	STATUS  	CHART                        	APP VERSION
hub            	cert-manager	1       	2020-02-02 10:57:58.486209 +0100 CET	deployed	binderhub-0.2.0-n079.h351d336

What puzzles me is that binderhub-0.2.0-n079.h351d336 is not listed in the above list of versions.

Running helm install '--version=0.2.0-n079.h351d336' '--namespace=cert-manager' -f '/var/folders/_k/g6547cr924b2vw4b_w61lfym0000gn/T/ansible.fzu39_4jbinderhub-config.yaml' 'hub' 'jupyterhub/binderhub' works…

Any ideas? Am I missing something obvious?

[pfisterer]

@consideRatio This is the case. Running helm install '--version=0.2.0-n079.h351d336' '--namespace=cert-manager' -f '/var/folders/_k/g6547cr924b2vw4b_w61lfym0000gn/T/ansible.fzu39_4jbinderhub-config.yaml' 'hub' 'jupyterhub/binderhub' works…

[pfisterer]

@consideRatio just for your reference: using helm v3, the command is helm search repo jupyterhub/binderhub --devel -l.

For me helm search repo jupyterhub/binderhub --devel -l | grep "\\-n" yields the following output:

jupyterhub/binderhub	0.2.0-n079.h351d336	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-n077.hef338bc	           	A helm chart to install Binder
jupyterhub/binderhub	0.2.0-n075.hb369d46	           	A helm chart to install Binder

Now, this makes sense to me.