Why does the entrypoint script copy files to /var/www, when the image build could do that?

[kastl-ars]

Dear maintainers,

while trying to get OpenCost running on OpenShift, I had a look at the UI image.

Once thing I noticed is this line:

opencost-ui/docker-entrypoint.sh

Line 4 in 459ddc5

cp -rv /opt/ui/dist/* /var/www

Why is this not part of the image build process? Why is done at runtime (which requires write permissions to /var/www/ which causes problems on e.g. OpenShift?

Or, if I understand this line from the Dockerfile properly, why is this done again in the entrypoint?

COPY --from=builder /opt/ui/dist /var/www

https://github.com/opencost/opencost-ui/blob/main/Dockerfile#L30

Kind Regards,
Johannes

[mittal-ishaan]

Checked on it further. Seems like this was done to allow opencost-ui to run in a read only file system dbfea70

Also to the question on https://github.com/opencost/opencost-ui/blame/main/Dockerfile#L30
I am not sure how this line has been added there. as according to this commit the Dockerfile had overwritten that line this year itself. Then from where is blame telling me that it was a 2 year old change.

[kastl-ars]

Seems like this was done to allow opencost-ui to run in a read only file system

How is adding a cp command to the entrypoint supposed to help with running on a read-only filesystem? Unless /var/www is being mounted from a volume and is writable?

Or am I missing something?