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docker: Set DEBIAN_FRONTEND only during build

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From the Dockerfile docs:

> Environment variable persistence can cause unexpected side effects.
> For example, setting ENV DEBIAN_FRONTEND=noninteractive changes the
> behavior of apt-get, and may confuse users of your image.
>
> If an environment variable is only needed during build, and not in the
> final image, consider setting a value for a single command instead.

So this patch adjusts the use of the DEBIAN_FRONTEND variable to match
the documented best practice.

https://github.com/albertito/chasquid/pull/68

Amended-by: Alberto Bertogli <albertito@blitiri.com.ar>
  Adjusted commit message.
This commit is contained in:
Guiorgy
2025-08-03 00:40:39 +04:00
committed by Alberto Bertogli
parent c6e3fb42b0
commit 2e6bc52f6a
1 changed files with 4 additions and 5 deletions
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9
docker/Dockerfile
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@@ -17,13 +17,12 @@ RUN go get -d ./... && \
# Create the image. # Create the image.
FROM debian:stable FROM debian:stable
# Make debconf/frontend non-interactive, to avoid distracting output about the
# lack of $TERM.
ENV DEBIAN_FRONTEND=noninteractive
# Install the packages we need. # Install the packages we need.
# This includes chasquid, which sets up good defaults. # This includes chasquid, which sets up good defaults.
RUN apt-get update -q && \ # Make debconf/frontend non-interactive, to avoid distracting output about the
# lack of $TERM.
RUN DEBIAN_FRONTEND=noninteractive \
apt-get update -q && \
apt-get install -y -q \ apt-get install -y -q \
chasquid \ chasquid \
dovecot-lmtpd dovecot-imapd dovecot-pop3d \ dovecot-lmtpd dovecot-imapd dovecot-pop3d \