Differences From Artifact [31fc42c4e8]:

• File Dockerfile — part of check-in [d778a02392] at 2023-03-24 08:07:53 on branch trunk — Dropped our canned /etc/os-release file entirely, recommending instead that those who need a VM-like container image switch the second stage from "scratch" to one of Google's "distroless" images, which provide that and more. That in turn gets rid of the need for the dummied up /usr/bin and /run, which simplifies the mainstream case. (user: wyoung size: 5247)

To Artifact [c6cb9d6c78]:

• File Dockerfile — part of check-in [ac95559482] at 2023-03-24 08:27:35 on branch trunk — Switched from a Dockerfile "ADD" command to wget for the BusyBox source tarball because, surprisingly, BuildKit pulls the URL unconditionally under the logic that it can't know whether to cache the pulled data until it has a copy to compare against! This not only means you pull the BusyBox source tarball for each container build even though it's tagged and thus cannot possibly change, it puts a load on GitHub which then causes it to begin throttling each pull, making your local builds slower and slower when iterating on a change set, as in the prior set of commits. By pushing the URL down into a wget command, we cause BuildKit to see an unchanging shell script line (assuming $BBXURL keeps its default) so it *does* cache the pulled layer. (user: wyoung size: 5288)

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### Bake the custom BusyBox into another layer.  The intent is that this
### changes only when we change BBXVER.  That will force an update of
### the layers below, but this is a rare occurrence.
ARG BBXVER="1_35_0"
ENV BBXURL "https://github.com/mirror/busybox/tarball/${BBXVER}"
COPY containers/busybox-config /tmp/bbx/.config
ADD $BBXURL /tmp/bbx/src.tar.gz
RUN set -x                                                             \
    && wget -O /tmp/bbx/src.tar.gz ${BBXURL}                           \
    && tar --strip-components=1 -C bbx -xzf bbx/src.tar.gz             \
    && ( cd bbx && yes "" | make oldconfig && make -j11 )

### The changeable Fossil layer is the only one in the first stage that
### changes often, so add it last, to make it independent of the others.
###
### $FSLSTB can be either a file or a directory due to a ADD's bizarre