Fossil SCM
Switched from a Dockerfile "ADD" command to wget for the BusyBox source tarball because, surprisingly, [https://github.com/moby/moby/issues/12361 | 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 $BBXURL keeps its default) so it *does* cache the pulled layer.
ac95559482cbc4962aba73386a842175cc7bfb9b5169a6ff5d34d8074eee4513
| --- Dockerfile | ||
| +++ Dockerfile | ||
| @@ -25,12 +25,12 @@ | ||
| 25 | 25 | ### changes only when we change BBXVER. That will force an update of |
| 26 | 26 | ### the layers below, but this is a rare occurrence. |
| 27 | 27 | ARG BBXVER="1_35_0" |
| 28 | 28 | ENV BBXURL "https://github.com/mirror/busybox/tarball/${BBXVER}" |
| 29 | 29 | COPY containers/busybox-config /tmp/bbx/.config |
| 30 | -ADD $BBXURL /tmp/bbx/src.tar.gz | |
| 31 | 30 | RUN set -x \ |
| 31 | + && wget -O /tmp/bbx/src.tar.gz ${BBXURL} \ | |
| 32 | 32 | && tar --strip-components=1 -C bbx -xzf bbx/src.tar.gz \ |
| 33 | 33 | && ( cd bbx && yes "" | make oldconfig && make -j11 ) |
| 34 | 34 | |
| 35 | 35 | ### The changeable Fossil layer is the only one in the first stage that |
| 36 | 36 | ### changes often, so add it last, to make it independent of the others. |
| 37 | 37 |
| --- Dockerfile | |
| +++ Dockerfile | |
| @@ -25,12 +25,12 @@ | |
| 25 | ### changes only when we change BBXVER. That will force an update of |
| 26 | ### the layers below, but this is a rare occurrence. |
| 27 | ARG BBXVER="1_35_0" |
| 28 | ENV BBXURL "https://github.com/mirror/busybox/tarball/${BBXVER}" |
| 29 | COPY containers/busybox-config /tmp/bbx/.config |
| 30 | ADD $BBXURL /tmp/bbx/src.tar.gz |
| 31 | RUN set -x \ |
| 32 | && tar --strip-components=1 -C bbx -xzf bbx/src.tar.gz \ |
| 33 | && ( cd bbx && yes "" | make oldconfig && make -j11 ) |
| 34 | |
| 35 | ### The changeable Fossil layer is the only one in the first stage that |
| 36 | ### changes often, so add it last, to make it independent of the others. |
| 37 |
| --- Dockerfile | |
| +++ Dockerfile | |
| @@ -25,12 +25,12 @@ | |
| 25 | ### changes only when we change BBXVER. That will force an update of |
| 26 | ### the layers below, but this is a rare occurrence. |
| 27 | ARG BBXVER="1_35_0" |
| 28 | ENV BBXURL "https://github.com/mirror/busybox/tarball/${BBXVER}" |
| 29 | COPY containers/busybox-config /tmp/bbx/.config |
| 30 | RUN set -x \ |
| 31 | && wget -O /tmp/bbx/src.tar.gz ${BBXURL} \ |
| 32 | && tar --strip-components=1 -C bbx -xzf bbx/src.tar.gz \ |
| 33 | && ( cd bbx && yes "" | make oldconfig && make -j11 ) |
| 34 | |
| 35 | ### The changeable Fossil layer is the only one in the first stage that |
| 36 | ### changes often, so add it last, to make it independent of the others. |
| 37 |